Flame-resistant thermoplastic branched polycarbonates of high molecular weight are prepared from:
(1) a carbonate precursor;
(2) at least one dihydroxyaromatic compound of formula:
where:
R is a single bond, or a substituted or non-substituted linear or branched C₁-C₅ alkylene radical, or a group chosen from O, S, SO₂ and CO;
X and Y, which may be the same or different, are H or CH₃;
m and n, which may be the same or different, are whole numbers from 1 to 4;
(3) at last one halogenated pyrimidine compound of formula:
where: R₂, R₃, R₄, which may be the same or different, are chlorine or bromine or hydrogen, on condition that at least one is chlorine or bromine;
R₁ is chlorine or bromine, or a radical of formula:
where Z is NH or S or O;
(4) at least one polyfunctional organic compound as branching agent, characterized by possessing at least three equal or different groups chosen from the groups OH, COOH, COCl and SO₂Cl.
高分子量阻燃热塑性支链聚
碳酸酯由以下材料制备而成:
(1)
碳酸酯前体;
(2) 至少一种式中的二羟基芳香族化合物:
其中
R 是单键,或取代或非取代的直链或支链 C₁-C₅亚烷基,或选 自 O、S、SO₂ 和 CO 的基团;
X 和 Y(可以相同或不同)是 H 或 CH₃;
m 和 n,可以相同,也可以不同,均为 1 至 4 的整数;
(3) 最后一种式中的卤代
嘧啶化合物:
其中R₂、R₃、R₄ 可以相同或不同,它们是
氯或
溴或氢,条件是至少有一个是
氯或
溴;
R₁ 是
氯或
溴,或者是式中的一个基团:
其中 Z 是 NH 或 S 或 O;
(4) 至少一种作为支化剂的多官能团有机化合物,其特征是具有至少三个相同或不 同的基团,这些基团选自 OH、COOH、COCl 和 SO₂Cl。