Universal tint paste having high solids
The invention relates to a high solids tint paste that is preferably substantially free of solvents that are volatile organic compounds. Preferably the universal tint paste is 100% solids and substantially free of any solvents. The universal tint paste is formed using a functional silicone resin intermediate that is end-capped with an alcohol, catalyzed to form a silicone resin product and combined with one or more desired pigments. The universal tint paste preferably can be used in a wide variety of solvent-borne and high solids coatings.
1. A high solids tint paste comprising:
a silicone resin having the following formula
where R, and R 3 individually correspond to methyl, phenyl or alkyl groups, R 2 and R 4 individually correspond to an alkyl group having at least two carbon atoms or phenyl group, n is greater than zero and R 1 , R 2 , R 3 , R 4 and n are selected so that the silicon resin is not volatile;
one or more pigments, wherein the one or more pigments is present in an amount of up to the critical pigment volume concentration based on the resin weight;
a solids concentration of from about 98 to about 100% solids; and
wherein R 1 , R 2 , R 3 , R 4 and n are selected such that the tint paste is compatible with multiple coating types without reacting with the coating types.
2. The tint paste of claim 1 wherein the tint paste is substantially free of volatile organic compounds.
3. The tint paste of claim 1 wherein the tint paste is substantially 100% solids.
4. The tint paste of claim 1 wherein the silicone resin is chemically inert.
5. The tint paste of claim 1 wherein the silicone resin has a weight per gallon of from about 8.6 to about 8.8 lbs/gal at 25° C., a viscosity of from about 85 to about 120 cps at 25° C. and a color of less than about 1 on the Gardner scale.
6. The tint paste of claim 1 wherein R 4 is a propyl group.
7. The tint paste of claim 1 wherein the tint paste has a fineness of grind of at least about 6 on the Hegmen scale.
8. The tint paste of claim 1 wherein R 4 is selected from the group consisting of ethyl, isopropyl, butyl, benzyl, and mixtures thereof.
9. The tint paste of claim 1 wherein R 1 and R 3 is selected from the group consisting of methyl, phenyl, and mixtures thereof.
10. The tint paste of claim 1 wherein the tint paste is compatible with multiple coating selected from the group consisting of acrylics, polyurethanes, epoxies, alkyds, polyesters, room-temperature vulcanization (RTV) silicones, vinyls, cab lacquers, thermosets, thermoplastics, and combinations thereof.
11. The tint paste of claim 2 wherein
R 4 is selected from the group consisting of ethyl, propyl, butyl, benzyl, isomers thereof and mixtures thereof; and
R 1 and R 3 is selected from the group consisting of methyl, phenyl, and mixtures thereof.
12. The tint paste of claim 11 wherein R 4 is a propyl group.
13. The tint paste of claim 11 wherein the silicone resin is chemically inert.
14. The tint paste of claim 11 wherein the silicone resin has a weight per gallon of from about 8.6 to about 8.8 lbs/gal at 25° C., a viscosity of from about 85 to about 120 cps at 25° C. and a color of less than about 1 on the Gardner scale.
15. The tint paste of claim 11 wherein the tint paste is substantially 100% solids.
16. The tint paste of claim 11 wherein the tint paste has a fineness of grind of at least about 6 on the Hegmen scale.
17. The tint paste of claim 12 wherein
the tint paste is substantially 100% solids;
the tint paste has a fineness of grind of at least about 6 on the Hegmen scale;
the silicone resin is chemically inert; and
the silicone resin has a weight per gallon of from about 8.6 to about 8.8 lbs/gal at 25° C., a viscosity of from about 85 to about 120 cps at 25° C. and a color of less than about 1 on the Gardner scale.
18. A method of manufacturing a high solids tint paste comprising the steps comprising:
providing a silicone resin intermediate of the following structure
where R 1 and R 3 individually correspond to methyl, phenyl or alkyl groups, R 2 corresponds to an alkyl group having at least two carbon atoms or a phenyl group, and n is greater than zero;
providing an alcohol having the following structure: R 4 (OH) m wherein R 4 corresponds to an alkyl group having at least two carbon atoms or phenyl group and m is 1;
providing a catalyst;
reacting the silicone resin with the alcohol in the presence of the catalyst for a period of time sufficient to produce an endcapped silicone resin that is non-volatile having the following formula
dispersing one or more pigments in the endcapped silicon resin in an amount of up to the critical pigment volume concentration based on the resin weight to form a tint paste having a solids concentration of from about 98 to about 100% solids, wherein R 1 , R 2 , R 3 , R 4 and n are selected such that the tint paste is compatible with multiple coating types without reacting with the coating types.
19. The method of claim 18 wherein:
the silicon resin intermediate is formed from a methoxy functional silicone intermediate of the following structure
the methoxy functional silicone intermediate is reacted with the catalyst and water to form the silicone resin intermediate.
20. The method of claim 18 wherein the alcohol is selected from the group consisting of ethanol, propanol, butanol, propyl alcohol, benzyl alcohol, low molecular weight diols and isomers thereof and mixtures thereof.
21. The method of claim 18 wherein the catalyst is selected from the group consisting of organometallics, acids, and bases.
22. The method of claim 18 wherein the tint paste is compatible with multiple a coatings selected from the group consisting of acrylics, polyurethanes, epoxies, alkyds, polyesters, room-temperature vulcanization (RTV) silicones, vinyls, cab lacquers, thermosets, thermoplastics, and combinations thereof.
23. The method of claim 18 wherein the tint paste is substantially free of volatile organic compounds.
24. The method of claim 18 wherein the tint paste is substantially 100% solids.
25. The method of claim 18 wherein the endcapped silicone resin is chemically inert.
26. The method of claim 18 wherein R 4 is a propyl group.
27. The method of claim 18 wherein the one or more pigments is dispersed in the endcapped silicone resin until achieving a fineness of grind of at least about 6 on the Hegmen scale.
28. The method of claim 18 wherein R 1 and R 3 is selected from the group consisting of methyl, phenyl, and mixtures thereof.
29. The method of claim 18 wherein the reacting step occurs at an ambient temperature.
30. The method of claim 18 wherein
R 1 and R 3 is selected from the group consisting of methyl, phenyl, and mixtures thereof;
R 4 is a propyl group;
the endcapped silicone resin is chemically inert;
the catalyst is selected from the group consisting of organometallics, acids, and bases;
the tint paste is substantially free of volatile organic compounds; and
the one or more pigments is dispersed in the endcapped silicone resin until achieving a fineness of grind of at least about 6 on the Hegmen scale.
31. The method of claim 30 further comprising the step of adding the tint paste to a coating selected from the group consisting of acrylics, polyurethanes, epoxies, alkyds, polyesters, room-temperature vulcanization (RTV) silicones, vinyls, cab lacquers, thermosets, thermoplastics, and combinations thereof.
32. A tint paste produced according to the steps comprising:
providing a silicone resin intermediate of the following structure
where R 1 and R 3 individually correspond to methyl, phenyl or alkyl groups, R 2 corresponds to an alkyl group having at least two carbon atoms or a phenyl group, and n is greater than zero
providing an alcohol having the following structure: R 4 (OH) m wherein R 4 corresponds to an alkyl group having at least two carbon atoms or phenyl group and m is 1;
providing a catalyst;
reacting the silicone resin with the alcohol in the presence of the catalyst for a period of time sufficient to produce an endcapped silicone resin that is non-volatile having the following formula
dispersing one or more pigments in the endcapped silicon resin in an amount of up to the critical pigment volume concentration based on the resin weight to form a tint paste having a solids concentration of from about 98 to about 100% solids, wherein R 1 , R 2 , R 3 , R 4 and n are selected such that the tint paste is compatible with multiple coating types without reacting with the coating types.
33. The tint paste of claim 32 wherein:
the silicon resin intermediate is further formed from a methoxy functional silicone intermediate of the following structure
the methoxy functional silicone intermediate is reacted with the catalyst and water to form the silicone resin intermediate.
34. The tint paste of claim 32 wherein the alcohol is selected from the group consisting of ethanol, propanol, butanol, isopropyl alcohol, benzyl alcohol, low molecular weight diols and mixtures thereof.
35. The tint paste of claim 32 wherein the tint paste is substantially free of volatile organic compounds.
36. The tint paste of claim 32 wherein the endcapped silicone resin is chemically inert.
37. The tint paste of claim 32 wherein R 4 is a propyl group.
38. The tint paste of claim 32 wherein R 1 and R 3 is selected from the group consisting of methyl, phenyl, and mixtures thereof.
39. The tint paste of claim 32 wherein:
R 1 and R 3 is selected from the group consisting of methyl, phenyl, and mixtures thereof;
R 4 is a propyl group;
the endcapped silicone resin is chemically inert;
the tint paste is substantially free of volatile organic compounds; and
the tint paste has a fineness of grind of at least about 6 on the Hegmen scale.