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1. 发明授权

US6114489A Reactive hyperbranched polymers for powder coatings 失效
标题翻译：用于粉末涂料的反应性超支化聚合物
公开(公告)号：US6114489A
公开(公告)日：2000-09-05
申请号：US826192
申请日：1997-03-27
申请人： Richard Vicari , Olan Stanley Fruchey , Kathleen Nelson Juneau , Shelby Freland Thames , James Wayne Rawlins
发明人： Richard Vicari , Olan Stanley Fruchey , Kathleen Nelson Juneau , Shelby Freland Thames , James Wayne Rawlins
IPC分类号： C08G18/42 , C08G18/80 , C09D5/03 , C09D167/00 , C09D201/00
CPC分类号： C09D201/005 , C08G18/4202 , C08G18/4283 , C08G18/8074 , C09D167/00 , C09D5/037 , C08G2150/20
摘要： Novel powder coating compositions containing reactive hyperbranched polymers are disclosed and claimed. Preferred embodiments include powder coating compositions formed from hyperbranched polyesters having terminal hydroxy, carboxy, epoxy, and isocyanate groups. Preferred hyperbranched polyesters are formed from .alpha.,.alpha.-bis-(hydroxymethyl)-propionic acid, which act either as crosslinkers, adhesion promotors, or flow and leveling agents. A process for the synthesis of powder coating compositions is also disclosed which involves (a) self condensation of one or more of the multifunctional monomers to form the hyperbranched polymer, optionally, in the presence of suitable reactive end-capping moieties which are described herein; (b) melt blending of the hyperbranched polymer with suitable amounts of one or more of polyesters, epoxy resins, blocked urethane resins, or acrylic resins, a crosslinker, and one or more of suitable additional ingredients including degassers or flow and leveling agents, to form a flake; and (c) grinding and sieving of the flake to form the powder coating composition. These compositions exhibit improved flow and curing properties. These compositions can therefore be formed into thin films and can be cured at low temperatures to form smooth surfaces. Additionally, these films are hard and exhibit enhanced impact resistance properties than the conventional polyester resins. Thus, these powder coating compositions find utilities in automotive, packaging, and appliances.
摘要翻译：公开并要求保护含有反应性超支化聚合物的新型粉末涂料组合物。优选的实施方案包括由具有末端羟基，羧基，环氧基和异氰酸酯基的超支化聚酯形成的粉末涂料组合物。优选的超支化聚酯由α，α-双（羟甲基） - 丙酸形成，其作为交联剂，粘合促进剂或流动剂和流平剂。还公开了合成粉末涂料组合物的方法，其涉及（a）一种或多种多官能单体的自缩合形成超支化聚合物，任选地，在本文所述的合适的反应性封端部分存在下; （b）将超支化聚合物与适量的一种或多种聚酯，环氧树脂，封闭的聚氨酯树脂或丙烯酸树脂，交联剂和一种或多种合适的额外成分（包括脱气剂或流动和流平剂）熔融共混至形成片状和（c）研磨和筛分薄片以形成粉末涂料组合物。这些组合物表现出改善的流动性和固化性能。因此，这些组合物可以形成为薄膜，并且可以在低温下固化以形成光滑的表面。此外，这些膜比常规聚酯树脂硬，表现出更好的抗冲击性能。因此，这些粉末涂料组合物可在汽车，包装和电器中找到效用。

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