Coating compositions having improved early hardness
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B05D-007/14
B05D-003/10
출원번호
US-0983939
(2011-01-04)
등록번호
US-8293321
(2012-10-23)
발명자
/ 주소
Huynh-Ba, Gia
Corcoran, Patrick Henry
출원인 / 주소
E I du Pont de Nemours and Company
대리인 / 주소
Xu, Gann G.
인용정보
피인용 횟수 :
0인용 특허 :
22
초록▼
A fast hardening clear coating composition for repairing a clear coat/color coat finish or a pigmented mono-coat of a vehicle comprising a film forming binder and an organic liquid carrier, where the binder contains a hydroxyl polymer component comprising (A) hydroxyl-containing acrylic polymer, (B)
A fast hardening clear coating composition for repairing a clear coat/color coat finish or a pigmented mono-coat of a vehicle comprising a film forming binder and an organic liquid carrier, where the binder contains a hydroxyl polymer component comprising (A) hydroxyl-containing acrylic polymer, (B) at least one hydroxyl-terminated component selected from the group consisting of (1) an organic diol having the formula where R1 and R2 are individually selected from the group of hydrogen and an alkyl group having 1, 3-5 carbon atoms and (2) a hydroxyl terminated reaction product of trimethylol propane and a lactone; (C) an organic polyisocyanate crosslinking component, at least portion of which comprises a trimer of isophorone diisocyanate or hexamethylene diisocyanate and the composition further contains, a curing catalyst, of a dialkyl tin aliphatic carboxylate, a tertiary aliphatic mono or diamine, an aliphatic carboxylic acid, and optionally, a zinc or calcium organic acid salt in an effective amount such that the coating composition on curing at ambient temperatures is in a water spot free and sufficiently hard state for sanding or buffing within about 2 hours after application or on cool down when baked under normal conditions.
대표청구항▼
1. A process for repairing a clear coat of a clear coat/color coat coating composition which comprises applying a layer of a clear coating composition to the clear coat and curing the layer of the applied clear coating composition, wherein, said clear coating composition contains a film forming bind
1. A process for repairing a clear coat of a clear coat/color coat coating composition which comprises applying a layer of a clear coating composition to the clear coat and curing the layer of the applied clear coating composition, wherein, said clear coating composition contains a film forming binder and a volatile organic liquid carrier for the binder, wherein the film forming binder contains: (A) a hydroxyl polymer component comprising at least one hydroxyl-containing acrylic polymer;(B) at least one hydroxyl-terminated component selected from the group consisting of (1) an organic diol having the formula where R1 and R2 are individually selected from the group consisting of hydrogen and an alkyl group having 1, 3-5 carbon atoms and (2) a hydroxyl terminated reaction product of trimethylol propane and a lactone; and(C) an organic polyisocyanate component, at least a portion of which comprises a trimer selected from the group consisting of a trimer of isophorone diisocyanate and a trimer of hexamethylene diisocyanate and any mixtures thereof, wherein the organic polyisocyanate component further comprises at least one of an asymmetric hexamethylene diisocyanate trimer, a biuret of hexamethylene diisocyanate, a biuret of isophorone diisocyanate and any mixtures thereof; wherein the ratio of equivalents of isocyanate per equivalent of hydroxyl groups in the binder is in the range of about 0.7/1 to 2.0/1; andwherein the clear coating composition further contains(D) a catalyst system for the binder comprising (i) at least one organotin compound,(ii) at least one tertiary amine,(iii) at least one organic carboxylic acid; and(iv) optionally, at least one organic acid salt selected from the group consisting of zinc organic acid salts and calcium organic salts; wherein the clear coating composition cures at ambient temperatures to a water spot free state within 2 hours after application; wherein the hydroxyl containing acrylic polymer comprises 5 to 50% by weight, based on the weight of the acrylic polymer, of a hydroxyl acrylic polymer having a weight average molecular weight of above 10,000 to 20,000, 20-60% by weight, based on the weight of the acrylic polymer, of a hydroxyl acrylic polymer having a weight average molecular weight of above 7,000 and up to 10,000 and 20-70% by weight by weight, based on the weight of the acrylic polymer, of a hydroxyl acrylic polymer having a weight average molecular weight of 2,000 up to 7,000. 2. A process for repairing a pigmented mono-coat finish which comprises applying a layer of a pigmented coating composition to the mono coat finish and curing the layer of the applied pigmented coating composition, wherein, said pigmented coating composition contains a film forming binder, one or more pigments and a volatile organic liquid carrier for the binder, wherein the film forming binder contains: (A) a hydroxyl polymer component comprising at least one hydroxyl-containing acrylic polymer;(B) at least one hydroxyl-terminated component selected from the group consisting of (1) an organic diol having the formula where R1 and R2 are individually selected from the group consisting of hydrogen and an alkyl group having 1, 3-5 carbon atoms and (2) a hydroxyl terminated reaction product of trimethylol propane and a lactone; and(C) an organic polyisocyanate component, at least a portion of which comprises a trimer selected from the group consisting of a trimer of isophorone diisocyanate and a trimer of hexamethylene diisocyanate and any mixtures thereof, wherein the organic polyisocyanate component further comprises at least one of an asymmetric hexamethylene diisocyanate trimer, a biuret of hexamethylene diisocyanate, a biuret of isophorone diisocyanate and any mixtures thereof; wherein the ratio of equivalents of isocyanate per equivalent of hydroxyl groups in the binder is in the range of about 0.7/1 to 2.0/1;andwherein the pigmented coating composition further contains(D) a catalyst system for the binder comprising (i) at least one organotin compound,(ii) at least one tertiary amine,(iii) at least one organic carboxylic acid; and(iv) optionally, at least one organic acid salt selected from the group consisting of zinc organic acid salts and calcium organic salts;wherein the one or more pigments are present in the pigmented coating composition in a pigment to binder weight ratio in a range of from about 0.1:100 to 300:100;wherein the pigmented coating composition cures at ambient temperatures to a water spot free state within 2 hours after application;wherein the hydroxyl containing acrylic polymer comprises 5 to 50% by weight, based on the weight of the acrylic polymer, of a hydroxyl acrylic polymer having a weight average molecular weight of above 10,000 to 20,000, 20-60% by weight, based on the weight of the acrylic polymer, of a hydroxyl acrylic polymer having a weight average molecular weight of above 7,000 and up to 10,000 and 20-70% by weight by weight, based on the weight of the acrylic polymer, of a hydroxyl acrylic polymer having a weight average molecular weight of 2,000 up to 7,000.
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