发明名称 |
COATING COMPOSITIONS |
摘要 |
<p>A thermosetting powder coating composition according to the present invention comprises as binder a co-reactable particulate mixture of a carboxylic acid-functional polyester component and a curing agent having groups reactive with carboxylic acid groups, characterized in that the carboxylic acid-functional component comprises a semi-crystalline polyester having an acid value of from 10 to 70 mg KOH/g and a hydroxy value of no more than 11 mg KOH/g. Generally the semi-crystalline polyester has one or more Tg values less than 55 DEG C, a sharp melting point of 50 to 200 DEG C and preferably a number average molecular weight of at least 1600. The composition may, if desired, include an amorphous polyester and the curing agent may be, for example, an epoxy resin or a bis(beta-hydroxyalkylamide). Coating compositions of the invention cure faster than in the absence of semi-crystalline polyesters and the thermoset coatings prepared therefrom have improved appearance and mechanical properties (especially flexibility).</p> |
申请公布号 |
GR3020671(T3) |
申请公布日期 |
1996.10.31 |
申请号 |
GR19960402029T |
申请日期 |
1996.07.31 |
申请人 |
COURTAULDS COATINGS (HOLDINGS) LIMITED |
发明人 |
O'KEEFFE, LUKE JAMES;NIXON, STEVEN ALISTAIR;CAMERON, COLIN;PENMAN, ALAN KEITH |
分类号 |
C09D5/03;C08G63/18;C08L63/00;C08L67/00;C09D5/46;C09D163/00;C09D167/00;C09D167/02;(IPC1-7):C09D167/00 |
主分类号 |
C09D5/03 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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