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    • 13. 发明授权
    • Low-profile additives for thermosetting polyester compositions
    • 用于热固性聚酯组合物的低轮廓添加剂
    • US5428105A
    • 1995-06-27
    • US329586
    • 1994-10-26
    • Frederick J. McGarryMary B. Chan-Park
    • Frederick J. McGarryMary B. Chan-Park
    • C08L67/06C08L9/00C08L9/06C08L53/02
    • C08L67/06
    • A curable polyester molding composition incorporating an elastomeric low profile additive dispersed in voided rubbery particle form throughout the composition is used in association with a compatibilizing agent to form a molded thermoset article having very smooth, light reflective, class A surfaces and having a matrix fracture energy which is comparable to articles formed from similar or identical molding compositions which are free of low profile additives. The low profile additive is an epoxidized elastomer or block copolymer having at least one flexible elastomer block and one monovinyl aromatic block. The compatibilizing agent is a copolymer having a diene polymer backbone which is compatible with the elastomer or the flexible diene block of the low profile additive, with constituents which are compatible or reactive with the polyester being grafted or adducted onto the diene polymer backbone. The compatibilizing agent improves the solubility of the low profile additive in the uncured molding composition to promote good dispersion, to promote and maintain small particle size of the low profile additive, and to enhance compatibility between the cured polyester matrix and the low profile additive, thereby providing a low profile mechanism wherein shrinkage compensation during curing of the composition occurs almost exclusively through voiding of the small tough elastomeric particles of the low profile additive dispersed in the cured polyester matrix.
    • 将一种可固化的聚酯模塑组合物结合到整个组合物中分散成空隙橡胶颗粒形式的弹性薄型添加剂与相容剂结合使用以形成具有非常光滑,光反射,A级表面并具有基体断裂能的模制热固性制品 其与由不含低调添加剂的相似或相同的模制组合物形成的制品相当。 低调添加剂是具有至少一个柔性弹性体嵌段和一个单乙烯基芳族嵌段的环氧化弹性体或嵌段共聚物。 相容剂是具有与低分子添加剂的弹性体或柔性二烯嵌段相容的二烯聚合物主链的共聚物,其与被接枝或加成到二烯聚合物主链上的聚酯相容或反应的成分。 相容剂改善了未固化的模塑组合物中的低轮廓添加剂的溶解度,以促进良好的分散性,促进和保持小型添加剂的小颗粒尺寸,并且增强了固化的聚酯基体和低轮廓添加剂之间的相容性 提供了一种低调机理,其中在组合物固化期间的收缩补偿几乎完全通过分散在固化的聚酯基质中的低分子量添加剂的小韧性弹性体颗粒的排空。