Coating compositions, their preparation, and coated articles made therefrom
View Patent ↗A coating composition comprising components A, B and optionally C, wherein component A comprises at least one hydroxy-terminated polyarylate. Component B is an organic species which can react with the hydroxy terminal groups of component A, and component C is a catalyst or mixture of catalysts. The hydroxy-terminated polyarylates are prepared by a solution polymerization method.
1. A coating composition comprising components A, B and optionally C
(i) component A comprising at least one polyarylate comprising structural units having formula I
wherein R 1 is independently at each occurrence a C 1 –C 12 alkyl radical and n is 0–3, said polyarylate further comprising phenolic hydroxy groups;
(ii) component B comprising at least one “organic species” comprising one or more functional groups, said functional groups being chemically reactive with the phenolic hydroxy groups of the polyarylate of component A; and optionally
(iii) component C one or more catalysts which promote chemical reaction between the polyarylate of component A and the “organic species” of component B,
wherein component B comprises at least one melamine resin, urea formaldehyde resin, or a combination thereof.
2. The coating composition according to claim 1 further comprising a co-resin.
3. The coating composition according to claim 1 wherein the concentration of component A is at about 1 to about 99 percent by weight of the total weight of the coating composition.
4. The coating composition according to claim 1 wherein the concentration of component B is at about 99 to about 1 percent by weight of the total weight of the coating composition.
5. The coating composition according to claim 1 wherein the concentration of component C is at about 0.00001 to about 10 percent by weight of the total weight of the coating composition.
6. The coating composition according to claim 1 wherein component A further comprises structural units having formula VIII:
wherein R 4 is a C 2 –C 100 aliphatic radial, or a C 4 –C 20 cycloaliphatic radical and R 5 and R 6 each independently represent a bond
7. The coating composition according to claim 6 wherein said C 2 –C 100 aliphatic radical R 4 comprises structural units having formula IX
8. The coating composition according to claim 6 wherein said C 2 –C 100 aliphatic radical R 4 comprises structural units having formula X
O—CH 2 CH 2 —O Formula (X).
9. The coating composition according to claim 6 wherein the concentration of the structural unit of formula VIII in component A is in a range between about 0.01 to about 50 percent by weight of the total weight of the coating composition.
10. The coating composition according to claim 1 wherein said polyarylate has a number average molecular weight in a range between about 2000 and about 5000 grams per mole.
11. The coating composition according to claim 1 wherein said polyarylate has a number average molecular weight in a range between about 500 and about 2500 grams per mole.
12. The coating composition according to claim 1 wherein the catalyst is selected from the group consisting of tertiary amines, quaternary ammonium salts, quaternary phosphonium salts, Lewis acids, and mixtures thereof.
13. The coating composition according to claim 1 further comprising at least one solvent.
14. The coating composition according to claim 13 wherein said solvent is selected from the group consisting of amides, esters, ethers, ketones, alcohols, aromatics, halogenated solvents and mixtures thereof.
15. The coating composition according to claim 14 wherein said solvent is selected from the group consisting of dimethylacetamide, tetrahydrofuran, and mixtures thereof.
16. The coating composition according to claim 1 further comprising water.
17. The coating composition according to claim 16 , said coating composition being a dispersion in water.
18. The coating composition according to claim 1 further comprising at least one additive selected from the group consisting of inorganic pigments, organic pigments, inorganic fillers, and organic fillers.
19. A powder coating composition comprising components A, B and optionally C
(i) component A comprising at least one polyarylate comprising structural units having formula I
wherein R 1 is independently at each occurrence a C 1 –C 12 alkyl radical and n is 0–3, said polyarylate further comprising phenolic hydroxy groups;
(ii) component B comprising at least one “organic species” comprising one or more functional groups, said functional groups being chemically reactive with the phenolic hydroxy groups of the oligomeric polyarylate of component A; and optionally
(iii) component C one or more catalysts which promote chemical reaction between the polyarylate of component A and the “organic species” of component B,
wherein component B comprises at least one melamine resin, urea formaldehyde resin, or a combination thereof.
20. The powder coating composition according to claim 19 further comprising a co-resin.
21. The powder coating composition according to claim 19 wherein the concentration of component A is at about 1 to about 99 percent by weight of the total weight of the powder coating composition.
22. The powder coating composition according to claim 19 wherein the concentration of component B is at about 99 to about 1 percent by weight of the total weight of the powder coating composition.
23. The powder coating composition according to claim 19 wherein the concentration of component C is at about 0.0001 to about 10 percent by weight of the total weight of the powder coating composition.
24. The powder coating composition according to claim 19 wherein component A further comprises structural units having formula VIII:
wherein R 4 a C 2 –C 100 aliphatic radial, or a C 4 –C 20 cycloaliphatic radical and R 5 and R 6 each independently represent a bond,
25. The powder coating composition according to claim 24 wherein said C 2 –C 100 aliphatic radical R 4 comprises structural units having formula IX
26. The powder coating composition according to claim 24 wherein said C 2 –C 100 aliphatic radical R 4 comprises structural units having formula X:
O—CH 2 CH 2 —O Formula (X).
27. The powder coating composition according to claim 24 wherein the concentration of the structural unit of formula VIII in component A is in a range between about 0.01 to about 50 percent by weight of the total weight of the powder coating.
28. The powder coating composition according to claim 19 wherein said polyarylate is a polyarylate oligomer having a number average molecular weight in a range between about 2000 and about 5000 grams per mole.
29. The powder coating composition according to claim 28 wherein said oligomeric polyarylate is amorphous.
30. The powder coating composition according to claim 28 wherein said oligomeric polyarylate is a crystalline solid.
31. The powder coating composition according to claim 19 wherein said polyarylate is a polyarylate oligomer having a number average molecular weight in a range between about 500 and about 2500 grams per mole.
32. The powder coating composition according to claim 19 wherein the catalyst is selected from the group consisting of tertiary amines, quaternary ammonium salts, quaternary phosphonium salts, Lewis acids, and mixtures thereof.
33. A coated article comprising:
a substrate layer comprising at least one thermoplastic polymer, thermoset polymer, a cellulosic material, glass or metal, and
at least one cured coating layer thereon, said coating comprising the cure-reaction products of components A, B and C:
(i) component A comprising at least one oligomeric polyarylate, said polyarylate comprising structural units having formula I
wherein R 1 is independently at each occurrence a C 1 –C 12 alkyl radical and n is 0–3, said oligomeric polyarylate further comprising hydroxy terminal groups;
(ii) component B comprising at least one “organic species” comprising one or more functional groups, said functional groups being chemically reactive with the reactive hydroxy terminal groups of the oligomeric polyarylate of component A; and
(iii) at least one catalyst which promotes the reaction between the oligomeric polyarylate of component A and the “organic species” of component B,
wherein component B comprises at least one melamine resin, urea formaldehyde resin, or a combination thereof.
34. The coated article according to claim 33 wherein the coating further comprises a co-resin.
35. The coated article according to claim 33 wherein component A further comprises structural units having formula VIII:
wherein R 4 a C 2 –C 100 aliphatic radial, or a C 4 –C 20 cycloaliphatic radical and R 5 and R 6 each independently represent a bond,