| 摘要 |
1522437 Flame retardant polycarbonate compositions GENERAL ELECTRIC CO 28 Oct 1976 [29 Oct 1975] 44953/76 Addition to 1496679 Heading C3R A non-opaque flame retardant composition comprises a polycarbonate and from 0À001 to 2À0% by weight, based on the polycarbonate of an alkali metal or alkaline earth metal salt of a monomeric or polymeric aromatic sulphonic acid that contains an electron withdrawing group, the polycarbonate and the salt each having a refractive index of from 1À54 to 1À65. Many salts are specified, e.g. sodium 2,5-dichlorobenzene sulphonate, and sodium trichlorobiphenyl sulphonate. |
