Method for producing coating having desired gloss value

1. A method for producing a coating having a target gloss value on a substrate, said coating is formed from a coating composition and a matting agent, said method comprising steps of:

a) obtaining a gloss-mixing ratio correlation data system that comprises correlations of gloss values to mixing ratios of said matting agent and said coating composition;

b) generating a target mixing ratio of said matting agent and said coating composition according to said target gloss value and said gloss-mixing ratio correlation data system;

c) producing a coating mixture comprising said coating composition and said matting agent having said target mixing ratio; and

d) producing said coating by applying said coating mixture over said substrate,

wherein said gloss-mixing ratio correlation data system is generated by a fitting process comprising the steps of:

i) producing a first coating mixture comprising said coating composition and said matting went according to a first mixing ratio x 1 , applying the first coating mixture over a first substrate and allowing the first coating mixture to dry forming a dry first coating, and measuring a first gloss value y 1 of the dry first coating;

ii) producing a second coating mixture comprising said coating composition and said matting agent according to a second mixing ratio x 2 , applying the second coating mixture over a second substrate and allowing the second coating mixture to dry forming a dry second coating, and measuring a second gloss value y 2 of the dry second coating;

iii) repeating the steps i) and ii) above for subsequent mixing ratios x 3 through x n , and measuring subsequent gloss values y 3 through y n ; and

iv) generating said gloss-mixing ratio correlation data system by fitting the mixing ratios) x 1 through x n and the gloss values y 1 through y n ;

wherein, n is an integer equal to or greater than 3, and said gloss-mixing ratio correlation data system has a correlation coefficient R 2 equal to or greater than 0.7, and

wherein said gloss-mixing ratio correlation data system is expressed as a 2-degree polynomial fitting equation:

y=a 1 x 2 +a 2 x+a 3   (1)

wherein is a gloss value, x is a mixing ratio a 1 , a 2 and a 3 are constants determined through fitting said mixing ratios x 1 through x n and said gloss values y 1 through y n .

2. The method of claim 1 , wherein said gloss-mixing ratio correlation data system is a gloss-mixing ratio plot chart in that said mixing ratios x 1 through x n and said gloss values y 1 through y n are plotted on an x-y chart and fitted to a fitting curve.

3. The method of claim 2 , wherein said fitting curve is displayed on said x-y chart.

4. The method of claim 1 , wherein said gloss-mixing ratio correlation data system has a correlation coefficient R 2 equal to or greater than 0.8.

5. The method claim 1 , wherein said mixing ratios are selected from weight mixing ratios, volume mixing ratios, or a combination thereof.

6. The method claim 1 , wherein said mixing ratios are volume mixing ratios.

7. he method of claim 1 further comprising the step of curing said coating.

8. The method of claim 1 , wherein said coating composition is selected from a solvent borne coating composition, a waterborne coating composition, or a powder coating composition.

9. The method of claim 1 , wherein said coating composition is selected from a two-pack coating composition or a one-pack coating composition.

10. The method of claim 1 , wherein said coating composition is selected from a chemical curable coating composition, a radiation curable coating composition, a chemical and radiation dual cure coating composition, or a lacquer coating composition.

11. The method of claim 1 , wherein said substrate is selected from metal, wood, plastic, composite, or a combination thereof.

12. The method of claim 1 , wherein said substrate is selected from a vehicle body, vehicle body part, or a combination thereof.

13. The method of claim 1 , wherein said matting agent comprises silica.

14. The method of claim 1 , wherein said matting agent comprises a polytrimethylene ether glycol having a Mn (number average molecular weight) in a range of from 500 to 10,000.

15. The method of claim 14 , wherein said polytrimethylene ether glycol is polymerized from bio-derived 1,3-propanediol.

16. A method for producing a predicted gloss value of a coating on a substrate, said coating is formed from a coating composition and a matting agent, said method comprising steps of:

a) obtaining a gloss-mixing ratio correlation data system that comprises correlations of gloss values to mixing ratios of said matting agent and said coating composition;

b) providing a target mixing ratio;

c) producing said predicted gloss value according to said gloss-mixing ratio correlation data system and said target mixing ratio; and

d) outputting said predicted gloss value to an output device,

wherein said gloss-mixing ratio correlation data system is generated by a fitting process comprising the steps of:

i) producing a first coating mixture comprising said coating composition and said matting agent according to a first mixing ratio x 1 , applying in the first coating mixture over a first substrate and allowing the first coating mixture to dry forming a dry first coating, and measuring a first gloss value y 1 of the dry first coating;

ii) producing a second coating mixture comprising said coating composition and said matting agent according to a second mixing ratio x 2 , applving the second coating mixture over a second substrate and allowing the second coating mixture to dry forming a dry second coating, and measuring a second gloss value y 2 of the dry second coating;

iii) repeating the steps i) and ii) above for subsequent mixing ratios x 3 through x n and measuring subsequent gloss values y 3 through y n ; and

iv) generating said gloss-mixing ratio correlation data system by fitting he mixing ratios x 1 through x n and the gloss values y 1 through y n ;

wherein, n is an integer equal to or greater than 3, and said gloss-mixing ratio correlation data system has a correlation coefficient R 2 equal to or greater than 0.7,

wherein said gloss-mixing ratio correlation data system is expressed as a 2-degree polynomial fitting equation:

y=a 1 x 2 +a 2 x+a 3   (1)

wherein is a y loss value x is a mixin ratio a 1 , a 2 and a 3 are constants determined through fitting said mixing ratios x 1 through x n and said gloss values y 1 through y n .

17. The method of claim 16 , wherein said gloss-mixing ratio correlation data system is a gloss-mixing ratio plot chart in that said mixing ratios x 1 through x n and said gloss values y 1 through y n are plotted on an x-y chart and fitted to a fitting curve.

18. The method of claim 17 , wherein said fitting curve is displayed on said x-y chart.

19. The method of claim 16 , wherein said gloss-mixing ratio correlation data system has a correlation coefficient R 2 equal to or greater than 0.8.

20. The method claim 16 , wherein said mixing ratios are selected from volume mixing ratios, weight mixing ratios, or a combination thereof.

21. The method claim 16 , wherein said mixing ratios are volume mixing ratios.