| 摘要 |
1434622 Foamable polycarbonate compositions GENERAL ELECTRIC CO 19 Dec 1973 [2 Jan 1973] 58868/73 Heading C3C A foamable flame-retardant injection-mouldable composition comprises a thermoplastic aromatic carbonate polymer, a finely divided powder as filler and a minor amount by wt. of a foaming agent. The polycarbonates may be derived from bisphenol-A (i.e. 2,2-bis-(4- hydroxyphenyl)propane, tetrabromobisphenol- A and/or 2,2 - (3,3<SP>1</SP> - 5,5<SP>1 </SP>- tetrabromo - 4,4<SP>1</SP>- dihydroxy - diphenyl)propane or phosgene and bisphenol-A, the mixture may be fed into an extruder and then comminuted into pellets which is then blended with the foaming agent and then injection-moulded. The filler may be wollastonite. |
