15
New Polyester Resin Technology for Dull and Semi-Matte Powder Coatings John D. Jacquin , Michael R. McCurdy, Derek J. Dennis, Cytec Industries, USA Marcos Evangelista, Cytec Brasil Especialidades Químicas Ltda, Brasil Delfio Favrin, Alessandro Minesso, Cytec Surface Specialties, Italy Abstract A new polyester resin technology has been commercialized that provides an effective route to manufacture matte powder coatings and offers advantages in processing and gloss consistency. This patent-pending technology provides a new solution to obtain 60° gloss results in the semi-matte and near dull matte ranges for both standard and super durable powder coatings. The new resin binder systems are combined with the powder coating ingredients in a single extrusion versus the typical use of either matting agents or dry blend technology using previously manufactured powders of differing reactivity. This paper summarizes results confirming the reliable and attractive matte powder finishes that may be achieved through application of this new technology. Introduction The growth of powder coatings for well over 30 years as an environmentally sustainable alternative for liquid paint is well known. Many industrial finishing segments, such as appliance, metal furniture, and lawn and garden are dominated by powder coating technology. However, there are numerous exterior durable market segments where dull or semi-matte gloss requirements predominate, such as architectural or military coatings that represent powder growth markets. Further, there are often processing limitations or special performance requirements that reduce the reliability and consistency of these low gloss powder coatings. Thus, various formulation techniques are engaged to achieve matte appearance, depending upon the chemistry and performance requirements of the powder coating. The chemistry of a particular powder coating is generally selected based on the performance and economic requirements of the application. For example, most chemically protective or indoor use applications are typically formulated with a bisphenol-A type epoxy binder or more frequently a hybrid system containing a carboxyl polyester crosslinked with an epoxy resin. Exterior durable powder coatings are generally based on polyester resins, although acrylic resins are also used in certain special powder finishes. Carboxyl polyesters are typically crosslinked with TGIC (triglycidyl isocyanurate) or beta-hydroxyalkylamide (HAA), and polyurethane powder coatings are typically formulated with a hydroxyl polyester resin crosslinked with a blocked Isocyanate or uretdione. The focus of this paper is the introduction of one shot extrusion technology based on novel carboxyl functional polyester resins crosslinked with a hydroxy alkyl amide hardener. Matte Powder Coating Background The matting effect in coatings is generally characterized by the gloss level measured by the amount of light that is reflected back at a reflective angle of 60°. The c hart below illustrates the labeling system for various gloss levels used in the coatings industry as well as the defining gloss reading for each category.

New Polyester Resin Technology for Dull and Semi-Matte

  • Upload
    others

  • View
    2

  • Download
    0

Embed Size (px)

Citation preview

Page 1: New Polyester Resin Technology for Dull and Semi-Matte

New Polyester Resin Technology for Dull and Semi-Matte Powder Coatings

John D. Jacquin, Michael R. McCurdy, Derek J. Dennis, Cytec Industries, USA Marcos Evangelista, Cytec Brasil Especialidades Químicas Ltda, Brasil

Delfio Favrin, Alessandro Minesso, Cytec Surface Specialties, Italy Abstract A new polyester resin technology has been commercialized that provides an effective route to manufacture matte powder coatings and offers advantages in processing and gloss consistency. This patent-pending technology provides a new solution to obtain 60° gloss results in the semi-matte and near dull matte ranges for both standard and super durable powder coatings. The new resin binder systems are combined with the powder coating ingredients in a single extrusion versus the typical use of either matting agents or dry blend technology using previously manufactured powders of differing reactivity. This paper summarizes results confirming the reliable and attractive matte powder finishes that may be achieved through application of this new technology. Introduction The growth of powder coatings for well over 30 years as an environmentally sustainable alternative for liquid paint is well known. Many industrial finishing segments, such as appliance, metal furniture, and lawn and garden are dominated by powder coating technology. However, there are numerous exterior durable market segments where dull or semi-matte gloss requirements predominate, such as architectural or military coatings that represent powder growth markets. Further, there are often processing limitations or special performance requirements that reduce the reliability and consistency of these low gloss powder coatings. Thus, various formulation techniques are engaged to achieve matte appearance, depending upon the chemistry and performance requirements of the powder coating. The chemistry of a particular powder coating is generally selected based on the performance and economic requirements of the application. For example, most chemically protective or indoor use applications are typically formulated with a bisphenol-A type epoxy binder or more frequently a hybrid system containing a carboxyl polyester crosslinked with an epoxy resin. Exterior durable powder coatings are generally based on polyester resins, although acrylic resins are also used in certain special powder finishes. Carboxyl polyesters are typically crosslinked with TGIC (triglycidyl isocyanurate) or beta-hydroxyalkylamide (HAA), and polyurethane powder coatings are typically formulated with a hydroxyl polyester resin crosslinked with a blocked Isocyanate or uretdione. The focus of this paper is the introduction of one shot extrusion technology based on novel carboxyl functional polyester resins crosslinked with a hydroxy alkyl amide hardener. Matte Powder Coating Background The matting effect in coatings is generally characterized by the gloss level measured by the amount of light that is reflected back at a reflective angle of 60°. The c hart below illustrates the labeling system for various gloss levels used in the coatings industry as well as the defining gloss reading for each category.

Page 2: New Polyester Resin Technology for Dull and Semi-Matte

Designation 60° Gloss Range Figure 1 – Range of Matte Finishes

There are numerous decorative and functional reasons for applying a matte finishing effect, such as minimizing reflective light, hiding defects, dirt, or creating an esthetically pleasing look in industrial applications or consumer items. For example, semi-matte finishes are desirable in architectural applications because they may well meet all of these criteria. Automotive dull matte black coatings hide interior trim parts while providing an attractive contrast to the high gloss body paint. Military equipment and vehicles requires a dull matte finish to resist detection. Overall, reduced gloss powder coatings for exterior applications represent a global volume of 100,000 MT annually. Present-Day Exterior Durable Matte Finish Technologies Matte Dry Blends Most semi-matte outdoor durable powder coatings containing carboxyl functional polyester resins are based on dry blend technology. This is achieved by first manufacturing two powder coatings with different levels of carboxyl functionality, and thus reactivity, crosslinked with either TGIC or HAA. The two separate powders are then combined via mixing of the chips, followed by a co-grind or by mixing the finely ground powders together. The resulting powder coating will produce the matte effect upon cure of the two phase powder. This is achieved via the different reaction rates of the two different powders in the coating. While the faster reacting powder crosslinks, the slower reactive powder is still in the melting phase or lags in cure response. Thus, the slower curing powder embeds in the fast, causing a microscopically irregular surface, and reducing the gloss of the fully cured film. The matte dry blend technology has several inherent deficiencies related to both the processing and the chemistry of the powder coating. The requirement to manufacture two separate powders and the additional mixing process step adds cost to the powder coating. This also introduces a yield loss and reduces the potential for reproducibility of film performance. The reduced homogeneity of the system can cause reduced mechanical performance and contributes to a “sparkle” effect in the coating appearance. Further, this may affect the ability to recycle the powder overspray, as higher gloss levels may occur upon respray. Co-extruded Polyurethane Powder Hydroxyl functional polyester resins of differing functionality (reactivity) may be co-extruded in one shot with a blocked isocyanate hardener to produce semi-matte to dull matte finishes, thus avoiding the dry blend process. The differing cure rates of the two polyesters with the isocyanate hardener cause the incompatibility in the film, resulting in a decreased gloss result. There is some “adjustability” to this process, whereby a greater difference in functionality of the resin hydroxyl content yields a lower gloss finish. The finished powder has excellent outdoor resistive properties and is typically more resistant to burnishing and chemical attack than the carboxyl polyester based powder coatings.

Page 3: New Polyester Resin Technology for Dull and Semi-Matte

However, there are two significant drawbacks of this system. The chemistry requires a substantially higher level of isocyanate hardener to crosslink the powder, adding cost to the formulation. Another deficiency is the overall reproducibility of the system, especially compared to the dry blend process. The co-extruded coating is sensitive to the dispersing conditions during the melt mixing, and may result in undesirable gloss results. This may necessitate additional processing and rework, adding cost and uncertainty to the application. Matting Agents for Dull Matte Finishes A dull matte powder coating can be achieved through the incorporation of a matting agent into a powder coating formulation based on a carboxyl functional polyester crosslinked with either TGIC or HAA. A glycidyl methacrylate (GMA) acrylic hardener is the most common type of matting agent utilized. The powder can be extruded as one formulation, maintaining normal processing costs. The gloss effect, which is typically in the dull matte range, is once again achieved through a cure reactivity differential. However, the differences in reactivity of the crosslinker and the matting agent when cured with the polyester cause the incompatibility effect that reduces the gloss. Powder coatings formulated with matting agents are most often used for specialty dull matte finishes. They are exterior durable yet do have some cost and performance deficiencies. The matting agent, which must be added at a substantially higher level than the typical TGIC or HAA crosslinker, is expensive, and may at times become a contaminant to other powder coating systems, necessitating special handling. The performance drawbacks often include reduced mechanical performance and susceptibility to burnishing. New One-Shot Polyester Resin Technology The patent-pending (WO2008/053436) technology developed by Cytec addresses several unmet needs for exterior durable powder coatings. Specific Crylcoat® carboxyl polyester resin pairs have been introduced to enable the powder coating manufacturer to process the ingredients as a single formulation in one extrusion -- the new one shot technology. The desired level of gloss can be achieved in a reproducible manner utilizing standard production processing equipment and conditions. The Crylcoat® resins are designed to be crosslinked with Hydroxyakylamide (e.g. Primid XL 552 from EMS-Primid AG or Vestagon EP-HA 320 from Evonik AG) and are offered in standard durable and super durable grades.

Figure 2 – Cytec Crylcoat® polyester resins for the One Shot Matte Range

Formulation For each resin pair, a 1:1 ratio of the high and low carboxyl functional polyester resins is suggested for formulation, along with the polyester to HAA hardener ratio indicated in figure 2. This will maximize the reproducibility of the gloss result. The gloss may be varied within the approximate range indicated for each resin pair by modifying the type and quantity of pigment and filler level in the powder coating formulation. A variety of starting point formulations have been evaluated, including those presented in figure 3.

Page 4: New Polyester Resin Technology for Dull and Semi-Matte

Figure 3 – Starting Point Formulations for One Shot Matte Evaluation

Powder Coating Processing The new one shot matte technology processes in the same manner as a standard formulation containing a polyester resin in a typical powder coating. Processing on a twin screw or mono-screw extruder under standard operating conditions (figure 4) will produce essentially the same gloss and coating performance results, confirmed by the evaluation of each of the one shot matte system pairs and in a variety of formulations. Additional testing was performed over a range of extruder speed and temperatures, with performance results comparable to that achieved under standard operating conditions. Gloss results were also comparable after a double extrusion, decreasing by only about one unit versus the initial result. Thus, the powder coatings manufacturer can expect a robust production process for the new one shot matte technology.

Page 5: New Polyester Resin Technology for Dull and Semi-Matte

Figure 4 - Typical powder coating process parameters

Robust Polyester Resin Technology The general properties of the one shot matte resin technology introduced in the Americas are summarized below.

Figure 5 – Resin properties for one shot matte coatings

The capability of the one shot resin technology to repeatedly generate gloss results in the dull or semi-matte range has by now been verified through the accumulation of multiple batches of consistent properties manufacturing at commercial scale. An evaluation technique was devised to develop the technology and insure the consistency of not only the resin but also the processing, spray, and cure of the powder coating. This was achieved by evaluating the gloss of powder coating formulations over a range of stoichiometric ratios centered around the theoretical ratio of carboxyl functionality to hydroxyalkylamide functionality. It must be recognized that a theoretical reaction in the one shot powder coating system is unlikely to occur. The carboxyl groups on the fast reacting polyester will rapidly react with available hardener, building up the polymer matrix. The steric hindrance increases as the three dimensional matrix builds, eventually restricting the ability of the remaining functional groups on the higher functional polyester to react. Simultaneously, the lower reactive polyester

Page 6: New Polyester Resin Technology for Dull and Semi-Matte

resin is still in the melt phase and only beginning to react. This impediment in cure response results in a programmed incompatibility, eventually resulting in a cured film with reduced gloss. A magnification of the microscopic structure of the cured film in figure 6 visually demonstrates the dissimilar topographic domains on the surface, scattering incident light and reducing the gloss of the coating.

Figure 6 – Surface topography of a durable Polyester-HAA one shot matte powder coating

The gloss and film performance properties were evaluated over a series of stoichiometric ratios. This analysis provided more than just a confirmation of the consistency of the one shot matte system. The optimum ratio of polyester to beta-hydroxyalkylamide hardener that resulted in desirable resistance to chemical, mechanical, and exposure conditions was also determined, assuring the overall performance of the powder coating. Generally, the polyester resin system that can maintain a consistent gloss and resistance properties over a broad range of stoichiometric conditions is likely to perform consistently in a standardized formulation. For each of the one shot matte resin pair systems presented, a one to one ratio of the polyester resins was considered as a logical starting point for the evaluations. An expected range of polyester to hardener ratios, based off the theoretical expectation was also assumed. The powder coatings were then formulated at polyester ratios ranging +10 parts from center, i.e. ranging from 60:40 to 40:60 parts. This differential in polyester content represents a significant disparity in carboxyl availability for the reaction. The stoichiometry of the powder coating was further broadened by varying the hardener level by +2 or more weight percentage. This represents an overall range of 2x the level of hardener in the formulation, contributing even further to the differential of available reactive sites in the powder coating. Results from this confirmation analysis are presented in figures 7 and 8.

Page 7: New Polyester Resin Technology for Dull and Semi-Matte

Figure 7 – Robustness of Polyester Resin Pairs over a range of low & high functional resin conditions

Figure 8 – Robustness of Polyester Resin Pairs over a range of polyester to hardener ratios

Page 8: New Polyester Resin Technology for Dull and Semi-Matte

As shown in figure 7, all of the one shot matte resin systems behave in a similar manner as the polyester resin ratio is varied. A minimum gloss is achieved near the 50:50 ratio, either in the dull or semi-matte range depending upon the resin pair chosen. These results also represent the evaluation of multiple batches of each resin type, confirming batch-to-batch production repeatability. To formulate a robust, one shot matte powder coating, it is recommended that the formulator combine the polyester resins in equal proportions. Certainly, the reproducibility of the gloss may dramatically decrease when a range of 55/45 to 45/55 is exceeded. Further skewing of the polyester ratio may result in desirable higher gloss-levels for specific applications, yet the results are unlikely to be reproducible. The gloss results presented in figure 8 also exhibit the same trend irrespective of the one shot pair evaluated. Over the range evaluated, a generally linear relationship between gloss and hardener content is observed. The increased level of hardener promoting a higher gloss is a logical result. Increasing the amount of the more mobile hardener counteracts the difference in reactivity of the two polyesters, reducing the incompatibility and development of topographical domains, thereby increasing the gloss of the powder coating. Generally, a polyester:hardener ratio at the midpoint of this curve was selected for starting point formulary recommendations, as indicated in figure 2. Straying away from the suggested ratio would likely result in inconsistent gloss results (excess hardener) or performance failures due to under cured films (deficient hardener). Cure Temperature Effects The results presented above are for systems cured for 15 minutes (oven time) at 200°C. However, accep table gloss results were also obtained for systems cured for 15 minutes (oven time) at 180°C. Generally the 180°C cure resulted in a gloss that was 1-2 units higher at 60°. This gloss trend was observed for each of the on e shot matte systems, with the superdurable dull matte system presented in figure 9. The effect of cure temperature on gloss was further evaluated at 170°C, over 15 and 25 minu te oven cures. The change in gloss was also negligible. Although the MEK resistance was maintained at the 170°C cure, the impact resistance was lost at the lo wer cure temperature. The overall minimal susceptibility to gloss variation in relation to cure differences also results in a more even appearance of the one shot matte powder coating over substrates with dissimilar thicknesses. .

Figure 9 – Effect of cure temperature on gloss for a low fill black superdurable one shot

near dull matte powder coating

Page 9: New Polyester Resin Technology for Dull and Semi-Matte

The under cure of a powder coating generally results in an increase of the gloss of the coating. Therefore, the gloss stability of one shot matte powder coatings was further evaluated for severely under-cured situations. Fifteen minute cures as low as 140 C were applied to durable and superdurable near dull gloss powder coatings based on the low fill black formulation. Generally, the trend toward a very slight increase in gloss continued as the cure temperature was lowered to 150 C. Below this temperature a rapid increase in gloss was observed, as indicated in figure 10.

Figure 10 – Effect of Under-cure on Gloss for a low fill black durable and superdurable one shot

near dull matte powder coatings Powder Coating Stability Powder coatings based on the one-shot matte HAA system have adequate storage stability. The durable one shot formulation typically withstands accelerated aging for 28 days at 40°C with minimal to moderate lumpin g. In this case, the powder was easily broken up, sieved and resprayed. The aging effect had minimal effect on the powder coating, producing comparable performance with a gloss value slightly lower than the freshly sprayed powder coating. Test results show that flow, flexibility, and reactivity were not significantly affected. The superdurable systems are somewhat more susceptible to sintering. Accelerated aging studies at 35°C over four weeks confirmed good blocking resistance over this range of conditions. A respray of the powder typically results in a somewhat lower gloss value, with other performance properties relatively unaffected. As is common to powder systems, the storage stability of the one shot matte powder coatings is partially dependent on the level and type of pigments and fillers incorporated into the formulation. Film Build Effects The effect of film build on gloss properties is somewhat dependent upon the formulation evaluated. Results observed in figure 11 with the simple low fill black powder coating indicated generally good consistency over a broad range of film thicknesses. The results with superdurable dull matte and semi-matte one shot systems behaved comparably to the durable systems.

Page 10: New Polyester Resin Technology for Dull and Semi-Matte

Figure 11 – Effect of film build on gloss

Appearance Attributes One shot matte powder coatings may significantly decrease or eliminate the sparkle effect on the surface of the powder compared to the typical matte dry blend powder system. The burnish resistance of the one shot matte system is improved over the dull matte systems formulated with a GMA acrylic matting agent; yet is not as robust as a polyurethane dull matte powder coating. The topography of the one shot matte system affects the smoothness of the film surface. For applications that require superior flow, depending on the color shade, grinding to a finer particle size and/or formulating to a higher binder content can increase the smoothness of the one shot matte coating. Chemical & Mechanical Resistance Performance The chemical resistance of the one shot matte systems, as measured in terms of MEK double rubs on a 50+5 micron film thickness, was excellent, often over a broad range of stoichiometry. Cross-hatch adhesion was also excellent over a range of hardener levels, achieving a 5B (100% retention) rating for systems cured at either 200 or 180°C. The pencil hardness of a typical one shot m atte powder coating is rated at H, with more highly filled formulations achieving a 2H level of hardness. Under-cure situations were also evaluated. Simple black one shot matte formulations containing either durable or superdurable resins combined at 50:50 ratios were cured for 15 minutes at temperatures as low as 140 C. The chemical resistance to MEK double rubs was maintained at after a cure for 15 minutes at 150 C. The cross-hatch adhesion was preserved at even lower cure temperature of 140 C. See figure 12 for performance results.

Page 11: New Polyester Resin Technology for Dull and Semi-Matte

Figure 12 – Chemical Resistance and Adhesion of Under-cured One shot Matte Systems

The mechanical properties of the one shot matte powder coatings are excellent, typically achieving a forward and reverse impact of 160 & 160 in-lb over a steel substrate for the durable systems and ranging around 80-120 in-lb for the superdurable systems. In the superdurable systems, the direct impact was typically slightly higher than the indirect result, and superdurable systems cured at 180°C had slightly lower impact results versus 200° C cure. These results often held up over a broad range of stoichiometry as well. Overall, the mechanical results are better than a matte dry blend powder coating. See figure 14 for chemical resistance and mechanical property results. As expected, the positive chemical resistance and adhesion results contribute toward good corrosion resistance of the one shot matte systems. As presented in figure 13, the salt fog corrosion of the superdurable one shot semi-matte system achieved reached 2000 hours with no more than 2 mm creep on Bonderite 1000 substrate.

Figure 13 – Salt fog corrosion resistance

Page 12: New Polyester Resin Technology for Dull and Semi-Matte

Matte Consistency of Alternative Hardeners The two most popular hydroxyalkylamide hardeners are Primid XL 552 produced by EMS-Primid AG and Vestagon EP-HA 320 provided by Evonik AG. Numerous comparisons were made between these two crosslinkers in one shot matte formulations. The resulting performance attributes were comparable in terms of gloss and film performance. A summary of results in a durable, near dull matte powder coating is shown in figure 14. Ems offers hardeners of related chemistry and these have been trialed in the one shot matte systems as well. Primid SF 45-10, which has a lower functionality than XL 552, yields gloss levels approximately 10 units higher than the common HAA grades. Primid QM 1260, a methyl analogue of XL 552 developed for direct fired gas-ovens, reduces yellowing in the powder coating yet also contributes to a higher gloss when formulated in the one shot matte powder systems. More work would need to be performed to confirm if either type can formulated in the one shot system and produce higher gloss levels on a consistent basis.

Figure 14 – HAA hardener comparisons

Filler Effects and Adjusting Gloss The type and quantity of the filler in the formulation can affect the eventual gloss of the one shot matte powder coating. Typically, barium sulfate is used as a filler in exterior powder coating applications due to its good weatherability during exposure. Two products, Sachtofine P and Sachtofine LG (Low Gloss), produced by Sachtleben, were evaluated. A key difference between the two is the larger particle size of the LG product. Increasing the level of Sachtofine P in the low fill black formulation results in a lower gloss. Substituting the 20% filler load of Sachtofine P with a 1:1 ratio of Sachtofine P & LG and all by LG also reduces the gloss of the coating.

Page 13: New Polyester Resin Technology for Dull and Semi-Matte

Figure 15 – Filler Effects

Exterior Exposure & Weatherability The weatherability of powder coatings formulated with the new one shot technology is currently under evaluation. Depending upon world area and local governing bodies, different standards may be considered. Often these requirements involve a combination of accelerated exposure testing with a long term outdoor exposure, typically in Florida. Coating markets such as the architectural and automotive industry use the test criteria to select coatings and insure that gloss retention and film performance are maintained in the field. In Europe, GSB and Qualicoat Class I and II provide standards for the approval of powder coatings applied to aluminum for architectural applications. In the United States, the AAMA (American Architectural Manufacturers Association) 2603 and 2604 standards are relevant for architectural coatings, including application to aluminum extrusions and panels. A variety of exposure testing will be presented for the one shot matte powder coatings. The most aggressive test, QUV-B (B-313), may obtain a definitive result after hundreds of hours of exposure; yet the correlation of this test to real world weatherability could be more robust. QUV-A or Xenon Arc (Suntest) exposure provide a better correlation, yet may require thousands of hours of exposure to determine a degradation trend. Florida exposure tests often take months, or in the case of superdurable based powder coatings, many years of testing to obtain a result. Despite the length of time to run the test, natural Florida exposure is considered to be the most realistic approximation of outdoor weatherability, and it is included as the most severe, high performance criteria for exterior exposure. Several examples of QUV-B exposure are presented. In figure 16, the effect of adjusting the polyester to hardener ratio is considered for the simple low fill black formulation. The results were comparable, as each superdurable one shot semi-matte formulation maintained 50% gloss retention after about 1000 hours.

Page 14: New Polyester Resin Technology for Dull and Semi-Matte

Figure 16 – QUV-B exposure – one shot SD semi-matte powder coatings

The QUV-B gloss retention of superdurable dull matte and semi-matte powder coatings in two different RAL colors is presented in figure 17. Gloss retention is generally maintained above 50% in the range of 650 – 900 hours of exposure. As observed in the black powder coating above, an increase in gloss values is observed during the initial hours of the accelerated test.

Figure 17 - Gloss retention of superdurable one shot dull and semi-matte powder coatings

Page 15: New Polyester Resin Technology for Dull and Semi-Matte

Test results for QUV-A or xenon arc require a longer time to accumulate gloss retention data. Initial indications on QUV-A testing have determined that 50% gloss retention can be maintained for a superdurable powder over 5000 hours of exposure. Test feedback on xenon arc exposure has also been positive. The weathering properties of the durable one shot dull matte combination of Crylcoat® E 04187 and E 04211 resins with HAA are acceptable for GSB and Qualicoat Class I approvals. The gloss retention is above 50% after 12 months of Florida exposure (facing at 5° south).

Figure 18 - Florida results for standard durable one-shot dull-matte powder coatings

Future Developments As the only truly global producer of powder coating resins and additives, Cytec is continuing the one shot matte technology innovation process through laboratory work in all regions of the world. Current research is targeting specific market needs and special applications as they apply to different world areas. For example, techniques to provide superior burnish resistance in darker shade matte powder coatings is being investigated, as well as resin design enhancements to further augment the overall flow and smoothness of the cured film. Through a continuous dialogue with the global market, Cytec research and development will continue to introduce enhancements to the one shot matte program and other powder coating resin technologies to expand the reach of powder coatings.

Conclusions The development of a one shot matte system that allows the powder coating industry to easily produce semi-matte and dull matte coatings for exterior applications has been commercialized by Cytec. Production batches are available from the Bassano, Italy facility for sales worldwide. This patent-pending technology is available in both standard durable and superdurable grades for application in the architectural, automotive, and general industrial market segments. The new one shot technology offers powder coating manufacturers ease of handling and significant cost advantages during production. The powder coating applicators will achieve consistent low gloss coatings with improved performance such as reduced sparkle and better mechanical resistance. As the popularity of low gloss finishes grows for exterior environments, the new one shot matte powder coatings offer a high quality, environmentally sustainable and cost effective solution to replace outdated coating technologies. ® Registered trademark of Cytec Industries