Flexible coating compositions having improved scratch resistance, coated substrates and methods related thereto
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08L-083/04
C08L-083/00
C08L-083/06
C08L-083/08
출원번호
US-0456576
(2003-06-09)
발명자
/ 주소
Anderson,Lawrence G.
De Saw,Shawn A.
Hartman,Marvis E.
Hayes,Deborah E.
Hockswender,Thomas R.
Kuster,Kymarie L.
Mayo,Michael Allen
Nakajima,Masayuki
Olson,Kurt G.
Sadvary,Richard J.
Schilli
출원인 / 주소
PPG Industries Ohio, Inc.
인용정보
피인용 횟수 :
22인용 특허 :
193
초록▼
Coating compositions are provided which include a polysiloxane comprising at least one reactive functional group and at least one material comprising at least one reactive functional group. Also provided are multi-layer composite coatings formed from a basecoat deposited from a pigmented coating co
Coating compositions are provided which include a polysiloxane comprising at least one reactive functional group and at least one material comprising at least one reactive functional group. Also provided are multi-layer composite coatings formed from a basecoat deposited from a pigmented coating composition and a topcoat applied over the basecoat, the topcoat deposited from the aforementioned coating composition. A method for improving the scratch resistance of a coated substrate, as well as coated substrates also are provided. The compositions of the invention provide highly scratch resistant coatings, particularly highly scratch resistant color-plus-clearcoatings.
대표청구항▼
Therefore we claim: 1. A cured coating formed from a coating composition formed from components comprising: (a) at least one polysiloxane comprising at least two reactive functional groups, the at least one polysiloxane comprising at least one of the following structural units (I): R1 nR2mSiO(4-n
Therefore we claim: 1. A cured coating formed from a coating composition formed from components comprising: (a) at least one polysiloxane comprising at least two reactive functional groups, the at least one polysiloxane comprising at least one of the following structural units (I): R1 nR2mSiO(4-n-m)/2 (I) wherein each R1, which may be identical or different, represents H, OH, a monovalent hydrocarbon group or a monovalent siloxane group; each R2, which may be identical or different, represents a group comprising at least one reactive functional group, wherein m and n fulfill the requirements of 0<n<4, 0<m<4 and 2짙(m+n)<4; (b) at least one reactant comprising at least one functional group that is reactive with at least one reactive functional group of (a), provided, when said at least one reactant (b) comprises at least one polyol, said polyol has a hydroxyl value ranging from 100 to less than 200, wherein each component is different, wherein the curec coating has a flexibility rating according to a Flexibility Test Method of at least 6 at a temperature of 70째 F., and wherein the cured coating has an initial scratch resistance value such that after scratch testing greater than 40 percent of initial 20째 gloss is retained. 2. A cured coating formed from a composition according to claim 1, wherein each R2, which may be identical or different, represents a group comprising at least one reactive functional group selected from a hydroxyl group, a carboxyl group, an isocyanate group, a blocked polyisocyanate group, a primary amine group, a secondary amine group, an amide group, a carbamate group, a urea group, a urethane group, a vinyl group, an unsaturated ester group, a maleimide group, a fumarate group, an anhydride group, a hydroxy alkylamide group, and an epoxy group. 3. A cured coating according to claim 1, wherein at least one R2 group represents a group comprising at least one reactive functional group selected from a hydroxyl group and a carbamate group. 4. A cured coating according to claim 3, wherein at least one R2 group represents a group comprising at least two reactive functional groups selected from a hydroxyl group and a carbamate group. 5. A cured coating according to claim 1, wherein at least one R2 group represents a group comprising an oxyalkylene group and at least two hydroxyl groups. 6. A cured coating according to claim 1, wherein the at least one polysiloxane has the following structure (II) or (III): wherein: m has a value of at least 1; m' ranges from 0 to 75; n ranges from 0 to 75; n' ranges from 0 to 75; each R, which may be identical or different, is selected from H, OH, monovalent hydrocarbon groups, monovalent siloxane groups, and mixtures of any of the foregoing; and Ra comprises the following stwcture (IV): --R 3--X (IV) wherein--R3 is selected from an alkylene group, an oxyalkylene group, an alkylene aryl group, an alkenylene group, an oxyalkenylene group, and an alkenylene aryl group; and X represents a group which comprises at least one reactive functional group. 7. A cured coating according to claim 6, wherein (n+m) ranges from 2 to 9. 8. A cured coating according to claim 7, wherein (n+m) ranges from 2 to 3. 9. A cured coating according to claim 6, wherein (n'+m') ranges from 2 to 9. 10. A cured coating according to claim 9. wherein (n'+in') ranges from 2 to 3. 11. A cured coating according to claim 6, wherein X represents a group which comprises at least one reactive functional group selected from a hydroxyl group, a carboxyl group, an isocyanate group, a blocked polyisocyanate group, a primary amine group, a secondary amine group, an amide group, a carbamate group, a urea group, a urethane group, a vinyl group, an unsaturated ester group, a maleimide group, a fumarate group, an anhydride group, a hydroxy alkylamide group, and an epoxy group. 12. A cured coating according to claim 11, wherein X represents a group comprising at least one reactive functional group selected from a hydroxyl group and a carbamate group. 13. A cured coating according to claim 11, wherein X represents a group comprising at least two hydroxyl groups. 14. A cured coating according to claim 1, wherein the at least one polysiloxane (a), when added to the other components that form the composition, is present in the composition in an amount ranging from 0.01 to 90 weight percent based on total weight of resin solids of the components from which the composition is formed. 15. A cured coating according to claim 14, wherein the at least one polysiloxane (a) is present in an amount of at least 2 weight percent. 16. A cured coating according to claim 15, wherein the at least one polysiloxane (a) is present in an amount of at least 5 weight percent. 17. A cured coating according to claim 16, wherein the at least one polysiloxane (a) is present in an amount of at least 10 weight percent. 18. A cured coating according to claim 1, wherein the at least one polyol is selected from polyether polyols, polyester polyols, acrylic polyols, and polyurethane polyols. 19. A cured coating according to claim 18, wherein the polyol comprises at least one polyalkylene oxide polyol. 20. A cured coating according to claim 18, wherein the polyol further comprises at least one reactive functional group other than a hydroxyl group. 21. A cured coating according to claim 20, wherein the at least one reactive functional group of the polyol comprises a carbamate functional group. 22. A cured coating according to claim 1, wherein the at least one polyol, when added to the other components that form the composition, is present in the composition in an amount ranging from 0.1 to 30 weight percent based on total weight of resin solids of the components from which the composition is formed. 23. A cured coating according to claim 22, wherein the at least one polyol, when added to the other components that form the composition, is present In an amount ranging from 5 to 20 weight percent based on total weight of resin solids of the components from which the composition is formed. 24. A cured coating according to claim 1, wherein the at least one reactant is selected from at least one curing agent. 25. A cured coating according to claim 20, wherein the at least one curing agent is selected from an aminoplast resin, a polyisocyanate, a blocked polyisocyanate compound, a polyepoxide, a polyacid, and a polyol. 26. A cured coating according to claim 25, wherein the at least one curing agent comprises a polyisocyanate. 27. A cured coating according to claim 25, wherein the at least one curing agent comprises a mixture of a polyisocyanate and an aminoplast resin. 28. A cured coating according to claim 24, wherein the curing agent, when added to the other components that form the composition, is present in an amount ranging from 5 to 40 weight percent based on total weight of resin solids of the components from which the composition is formed. 29. A cured coating according to claim 1, wherein the components from which the coating composition is formed comprise at least one film-forming material. 30. A cured coating according to claim 29, wherein the at least one film-forming material is selected from at least one additional polymer, in addition to and different from the at least one polysiloxane (a) and the at least one polyol (b), comprising at least one reactive functional group. 31. A cured coating according to claim 29, wherein the at least one additional polymer comprises at least one reactive functional group selected from a hydroxyl group, a carbamate group, an epoxy group, an isocyanate group, and a carboxyl group. 32. A cured coating according to claim 1, wherein the components from which the composition is formed comprise at least one material which has at least one reactive functional group which is blocked with a silyl group. 33. A cured coating according to claim 32, wherein the silyl blocking group has the following structure (IX): wherein each R1, R2 and R3, which may be identical or different, represents hydrogen, an alkyl group having from 1 to 18 carbon atoms, phenyl or allyl. 34. A cured coating according to claim 32, wherein the at least one reactive functional group is selected from a hydroxyl group, a carbamate group, a carboxyl group, and an amide group. 35. A cured coating according to claim 32, comprising at least one compound which can be reacted with the functional group to form the silyl group, wherein the at least one compound is selected from hexamethyldisilazane, trimethylchlorosilane, trimethylsilyldiethylamine, t-butyl dimethylsilyl chloride, diphenyl methylsilyl chloride, hexamethyl disilylazide, hexamethyl disiloxane, trimethylsilyl triflate, hexamethyldisilyl acetamide and mixtures of any of the foregoing. 36. A cured coating according to claim 32, wherein the at least one reactant has a backbone which comprises at least one linkage selected from an ester linkage, a urethane linkage, a urea linkage, an amide linkage, a siloxane linkage, and an ether linkage or at least one polymer selected from a polyester polymer, an acrylic polymer, a polyurethane, a polyether, a polyurea, a polyamide, and copolymers of any of the foregoing. 37. A cured coating according to claim 32, wherein the reactant comprises at least one compound having the following structure (X): 38. A cured coating according to claim 1, wherein the components from which the coating composition is formed further comprise at least one adjuvant surface active agent selected from an anionic surface active agent, a cationic surface active agent and a nonionic surface active agent. 39. A cured coating according to claim 1, wherein the components from which the coating composition is formed further comprise at least one catalyst. 40. A cured coating according to claim 39, wherein the at least one catalyst is selected from at least one acid functional catalyst. 41. A cured coating according to claim 40, wherein the at least one acid functional catalyst is selected from an acid phosphate, a substituted sulfonic acid and an unsubstituted sulfonic acid. 42. A cured coating according to claim 41, wherein the at least one acid functional catalyst is selected from phenyl acid phosphate and dodecylbenzene sulfonic acid. 43. A cured coating according to claim 1, wherein the components from which the coating composition is formed further comprise a plurality of particles which are different from components (a), (b) and (c). 44. A cured coating according to claim 43, wherein the plurality of particles are selected from inorganic particles, composite particles, and mixtures thereof. 45. A cured coating according to claim 43, wherein the particles are selected from fumed silica, amorphous silica, colloidal silica, alumina, colloidal alumina, titanium dioxide, cesium oxide, yttrium oxide, colloidal yttria, zirconia, colloidal zirconia and mixtures of any of the foregoing. 46. A cured coating according to claim 45, wherein the particles include colloidal silica. 47. A cured coating according to claim 43, wherein the particles are surface treated. 48. A cured coating according to claim 43, wherein the particles have an average particle size of less than 100 microns prior to incorporation into the composition. 49. A cured coating according to claim 43, wherein the particles have an average particle size ranging from 1 to less than 1000 nanometers prior to incorporation into the composition. 50. A cured coating according to claim 49, wherein the particles have an average particle size ranging from 1 to 100 nanometers prior to incorporation into the composition. 51. A cured coating according to claim 50, wherein the particles have an average particle size ranging from 5 to 50 nanometers prior to incorporation into the composition. 52. A cured coating according to claim 43, wherein the particles, when added to the other components that form the composition, are present in the composition in an amount ranging from 0.01 to 75 weight percent based on total weight of the resin solids of the components from which the composition is formed. 53. A cured coating according to claim 52, wherein the particles are present in an amount of at least 0.1 weight percent. 54. A cured coating according to claim 53, wherein the particles are present in an amount of at least 0.5 weight percent. 55. A cured coating according to claim 54, wherein the particles are present in an amount of at least 5 weight percent. 56. A cured coating according to claim 52, wherein the particles are present in an amount of less than 50 weight percent. 57. A cured coating according to claim 56, wherein the particles are present in an amount of less than 20 weight percent. 58. A cured coating according to claim 56, wherein the particles are present in an amount of less than 10 weight percent. 59. A cured coating according to claim 1, wherein the cured coating has a flexibility of at least 8 at a temperature of 70째 F. 60. A cured coating according to claim 59, wherein the cured coating has a flexibility of at least 9 at a temperature of 70째 F. 61. A cured coating according to claim 1, wherein the cured coating has a glass transition temperature ranging from-20째 C. to 100째 c. 62. A cured coating according to claim 61, wherein the cured coating has a glass transition temperature ranging from 40째 C. to 90째 C. 63. A cured coating according to claim 1, wherein the cured coating has an initial scratch resistance value such that after scratch testing greater than 50 percent of the initial 20째 gloss is retained. 64. A cured coating according to claim 1, wherein the coating is thermally cured. 65. A cured coating according to claim 1, wherein the cured coating is cured by exposure to ionizing radiation. 66. A cured coating according to claim 1, wherein the cured coating is cured by exposure to actinic radiation. 67. A cured coating according to claim 1, wherein the cured coating is cured by exposure to (1) ionizing radiation or actinic radiation and (2) thermal energy.
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