Thermoplastic block copolyester resin composition containing a nucleating agent and an accelerator
申请人:AKZO N.V.
公开号:EP0109123A1
公开(公告)日:1984-05-23
A thermoplastic block copolyester resin composition comprising (A) a block copolyester which substantially consists of repeating intralinear long-chain ester units and short-chain ester units joined through ester linkages, which long-chain ester units correspond to the formula
and which short-chain ester units correspond to the formula
where G is a divalent radical remaining after the removal of terminal hydroxyl groups from at least one long-chain glycol having a melting point not higher than 55°C and a number average molecular weight of from 400-4000, R is a divalent radical remaining after removal of carboxyl groups from at least one dicarboxylic acid having a molecular weight of less than 300, and D is a divalent radical remaining after removal of hydroxyl groups from at least one aliphatic diol having a molecular weight of less than 250, with the proviso that the short-chain ester units contain at least 85 mole per cent of ethylene terephthalate units, said short-chain ester units being present in an amount of 25-85% by weight, based on the copolyester; (B) a nucleating agent in an amount of 0,01 to 10% by weight, based on the copolyester, and an accelerator (C) in an amount such that the heat of cold crystallization AHH per g resin is at least 15% smaller than that of a blend of the components (A) and (B).
一种热塑性嵌段共聚聚酯树脂组合物,包括 (A) 嵌段共聚聚酯,该嵌段共聚聚酯实质上由重复的线内长链酯单元和通过酯键连接的短链酯单元组成,其中长链酯单元的结构式为
而短链酯单元则符合以下公式
其中,G 是至少一种长链乙二醇去掉末端羟基后剩余的二价基,其熔点不高于 55℃,平均分子量在 400-4000 之间;R 是至少一种二羧酸去掉羧基后剩余的二价基,其分子量小于 300、D 是至少一种分子量小于 250 的脂肪族二元醇脱去羟基后剩余的二价基,但短链酯单元含有至少 85 摩尔%的对苯二甲酸乙二醇酯单元,所述短链酯单元的存在量为共聚聚酯的 25-85%(重量百分比);(B) 成核剂,其用量为 0.01 至 10%(以共聚聚酯的重量计),以及促进剂 (C),其用量为每克树脂的冷结晶热 AHH 至少比组分 (A) 和 (B) 的混合物的冷结晶热 AHH 低 15%。