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    • 57. 发明授权
    • Stabilization of highly heat distortion resistant polycarbonates
    • 高耐热变形聚碳酸酯的稳定化
    • US5194467A
    • 1993-03-16
    • US816918
    • 1992-01-03
    • Helmut-Martin MeierUwe WesteppeRolf DheinDieter FreitagMartin WandelAxel Sandquist
    • Helmut-Martin MeierUwe WesteppeRolf DheinDieter FreitagMartin WandelAxel Sandquist
    • C08K5/5435
    • C08K5/5435
    • Highly heat distortion resistant moulding compositions are disclosed comprising an aromatic polycarbonate having molecular weights Mw (weight average) of a least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR1## wherein R.sup.1 and R.sup.2 denote, independently of one another, hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,m stands for an integer from 4 to 7,R.sup.3 and R.sup.4, which are selected individually for each X, denote, independently of one another, hydrogen or C.sub.1 -C.sub.6 -alkyl, andX denotes carbonunder the condition that R.sup.3 and R.sup.4 are both alkyl on at least one X atom andas the only thermo stabilizer, from 0.001 to 1% by weight of a siloxane corresponding to formula (II) ##STR2## wherein R and R' denote, independently of one another, C.sub.1 -C.sub.4 -alkyl or -aryl andx and y stand for the numbers 1,2 or 3 and x+y always add up to 4.
    • 公开了耐热变形性模塑组合物,其包含具有至少10,000的分子量Mw(重均分子)的芳族聚碳酸酯,其含有对应于式(Ia)的双官能碳酸酯结构单元,其中R1和R2独立地表示 另一个是氢,卤素,C 1 -C 8 - 烷基,C 5 -C 6 - 环烷基,C 6 -C 10 - 芳基或C 7 -C 12 - 芳烷基,m代表4-7的整数,R3和R4分别为 每个X彼此独立地表示氢或C 1 -C 6 - 烷基,X表示碳,在R 3和R 4均为至少一个X原子上为烷基且仅为热稳定剂的情况下,为0.001至1% 重量的对应于式(II)的硅氧烷(II)其中R和R'彼此独立地表示C 1 -C 4 - 烷基或 - 芳基,x和y表示数字1,2或3 并且x + y总是最多为4。