Primer coating composition and polymeric film coated with primer coating for silicone release applications
申请人:HOECHST CELANESE CORPORATION
公开号:EP0484819A2
公开(公告)日:1992-05-13
The present invention describes a polymeric support film coated with a primer coating composition and overcoated with a silicone release coating, thereby forming a silicone release film. Silicone release films are well known and serve as temporary supports for an adhesive or tacky surface such as for labels, pressure sensitive tape, etc. The primer coating composition, before dilution with water, comprises from about 25 to 75 % by weight of a glycidoxy silane and from about 75 to 25 % by weight of a copolyester. The copolyester comprises from about 65 to 98 mol percent isophthalic acid; from about 0 to about 30 mol percent of at least one aliphatic dicarboxylic acid; from about 2 to about 20 mol percent of at least one sulfonate group attached to a dicarboxylic nucleus; and about 100 mol percent of glycol having from about 2 to 11 carbon atoms. Typical glycidoxy silanes that can be employed in the primer coating composition include glycidoxypropyltrimethoxysilane.
本发明描述了一种涂有底漆涂层组合物的聚合物支撑膜,该聚合物支撑膜表面涂有硅胶离型涂层,从而形成硅胶离型膜。有机硅离型膜是众所周知的,可作为粘合剂或粘性表面(如标签、压敏胶带等)的临时支撑物。底层涂料组合物在用水稀释前,由重量百分比约为 25% 至 75% 的缩水甘油醚硅烷和重量百分比约为 75% 至 25% 的共聚聚酯组成。共聚聚酯包括约 65% 至 98% 的间苯二甲酸;约 0% 至约 30% 的至少一种脂肪族二羧酸;约 2% 至约 20% 的至少一种与二羧酸核相连的磺酸基;以及约 100% 的具有约 2 至 11 个碳原子的乙二醇。可用于底层涂料组合物的典型缩水甘油硅烷包括缩水甘油丙基三甲氧基硅烷。