| 摘要 |
1,239,504. Polyorthocarbonate polymers. GENERAL ELECTRIC CO. 3 March, 1969 [4 March, 1968], No. 11177/69. Heading C3R. The invention comprises polymers containing units of formula where R and R<SP>1</SP> are phenyl, naphthyl, biphenyl or halo- or alkyl-substituted phenyl, naphthyl or biphenyl, and R<SP>11</SP> is a divalent aliphatic or aromatic group. The polymer also may contain units of formula where R<SP>11</SP> is an alkylene or arylene radical and 8 and z are 0 or 1. The polymers are obtained by reacting a diaryloxydihalomethane of formula where X is chlorine, bromine or iodine, with a dihydroxy compound of formula HO-R<SP>11</SP>-OH in the presence of an hydrogen halide acceptor. When the optional units are to be present a diacid dihalide of formula is an additional reactant. In examples, polymers are obtained by reacting dichlorodiphenoxymethane with bisphenol A, 4,41-dihydroxybiphenyl, 4,4<SP>1</SP> - dihydroxy - 3,3<SP>1 </SP>- dimethylbiphenyl, 4,4<SP>1 </SP>- dihydroxy - 3,3<SP>1</SP>,5,5<SP>1</SP> - tetramethylbiphenyl, 4,41 - dihydroxy - 3,3<SP>1</SP>,5,5<SP>1</SP>- tetraphenylbiphenyl, 2,2 - bis - (4 - hydroxy-3,5- dimethylphenyl) propane, 1,5 - naphthalenediol, 1,6-naphthalenediol, hydroquinone, resorcinol and 2,7-naphthalenediol, and by reacting a mixture of dichlorodiphenoxymethane and phosgene with 2,7-naphthalenediol. |
