Polysiloxane graft copolymers, flexible coating compositions comprising same and branched polysiloxane macromers for preparing same
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0284679A1
公开(公告)日:1988-10-05
Hydroxy functional polysiloxane graft copolymers are provided. The copolymer is crosslinkable by hydroxy-reactive crosslinking agent and, in particular, is suitable for use in thermosetting coating compositions adapted to form a flexible cured coating over a variety of substrates, such as metal and plastic. The copolymer has a number average molecular weight between about 1000 and about 15,000, has a hydroxyl number between about 30 and about 300, and is the reaction product of carbon-carbon double bond-reactive monoethylenically unsaturated monomer with hyroxy functional carbon-carbon double bond-bearing branched polysiloxane macromer. The macromer is the reaction product of (i) epoxy monomer having the formula:
with (ii) hydroxy functional polysiloxane reactant containing 0-10 urethane linkages per molecule.
本发明提供了羟基官能团聚硅氧烷接枝共聚物。这种共聚物可通过羟基反应型交联剂进行交联,尤其适合用于热固性涂料组合物,以在金属和塑料等各种基材上形成柔性固化涂层。该共聚物的平均分子量在约 1000 到约 15000 之间,羟基数在约 30 到约 300 之间,是碳碳双键反应型单乙烯基不饱和单体与含羟基官能团的碳碳双键支链聚硅氧烷大单体的反应产物。大单体是(i)式如下的环氧单体与(ii)式如下的羟基官能团聚硅氧烷的反应产物:
与(ii)羟基官能团聚硅氧烷反应物的反应产物,每分子含有 0-10 个氨基甲酸乙酯链节。