New siloxane-esters, useful as powder coating resins, are prepared by random condensation polymerization of a hindered glycol and a hydroxy functional silicone having about two Si(R)OH groups per molecule wherein R is lower alkyl or phenyl groups and the remaining silicone valences form ring-structured siloxanes. Improved powder properties, including tack temperatures of 150°F to 220°F, are believed to result in part from the hindered glycols especially those having carboxylic functionality.
新型
硅氧烷酯可用作粉末涂料
树脂,其制备方法是将受阻
乙二醇和羟基官能团
硅氧烷进行无规缩合聚合,每个分子中约有两个 Si(R)OH 基团,其中 R 为低级烷基或苯基,其余
硅氧烷价形成环状结构的
硅氧烷。据信,粉末性能的改善,包括 150°F 至 220°F 的粘着温度,部分归功于受阻二醇,特别是那些具有羧基官能团的受阻二醇。