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1. 发明授权

US4530977A Low temperature-curing polyester urethane systems 失效
标题翻译：低温固化聚酯聚氨酯体系
公开(公告)号：US4530977A
公开(公告)日：1985-07-23
申请号：US636020
申请日：1984-07-30
申请人： Ronald J. Lewarchik , Gerry K. Noren , Ronald Metcalfe , Demetrius J. Bonin , Erwin S. Poklacki
发明人： Ronald J. Lewarchik , Gerry K. Noren , Ronald Metcalfe , Demetrius J. Bonin , Erwin S. Poklacki
IPC分类号： C08G18/00 , C08G18/10 , C08G18/42 , C09D175/06 , C08G18/32 , C08G63/76
CPC分类号： C08G18/10 , C08G18/4238 , C09D175/06
摘要： An hydroxy-functional polyurethane reaction product is disclosed which enables the provision of thermosetting solution coating compositions which cure at low temperature to form flexible coatings. These polyurethanes are provided by the reaction of an organic diisocyanate with a stoichiometric excess of an essentially linear hydroxy-functional polyester which is the polyesterification reaction product of C.sub.4 -C.sub.10 aliphatic dicarboxylic acid or anhydride thereof with a stoichiometric excess of C.sub.3 -C.sub.8 aliphatic diol providing an alcohol/acid molar ratio of 3/2 to 6/5. The reaction is substantially complete as indicated by an acid number less than 10, and the diisocyanate is used in an amount providing an NCO/OH ratio of from 2/3 to 12/13. The thermosetting solution coating composition is provided by an organic solvent having dissolved therein from 5-50% of total resin solids of a curing agent reactive with hydroxy groups together with the polyurethane which has been described. The preferred curing agent is a partially methylolated melamine which contains from about 5 mol percent to about 40 mol percent of the methylol group.
摘要翻译：公开了一种羟基官能聚氨酯反应产物，其能够提供在低温下固化以形成柔性涂层的热固性溶液涂料组合物。这些聚氨酯通过有机二异氰酸酯与化学计量过量的基本上线性的羟基官能聚酯的反应来提供，所述聚酯是C4-C10脂族二羧酸或其酸酐与化学计量过量的C 3 -C 8脂族二醇的聚酯化反应产物，其提供醇/酸的摩尔比为3/2〜6/5。反应基本上完成，酸值小于10表示，二异氰酸酯的使用量为NCO / OH比为2/3至12/13。热固性溶剂涂料组合物由其中溶解有有机溶剂的有机溶剂由与已经描述的聚氨酯一起的5-羟基树脂固体的总树脂固体的羟基提供。优选的固化剂是部分羟甲基化的三聚氰胺，其含有约5mol％至约40mol％的羟甲基。

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