Polycarbonate composition
US5852156A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1996 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Aug 14, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/526
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polycarbonate composition comprises (a) a substantially chlorine-atom free, aromatic dihydroxy compound/carbonic diester transesterification polycarbonate, and the following components (b), (c) and (d) in specifically, extremely limited amounts, wherein component (b) is at least one metal selected from an alkali metal and an alkaline earth metal, component (c) is an aromatic monohydroxy compound, and component (d) is at least one member selected from an oligomer having a weight average molecular weight of 1,000 or less and a residual monomer. This polycarbonate composition is substantially free from occurrence of crazing, even when it experiences moist heat, and especially even when it has been recycled. Further, when this polycarbonate composition is continuously injection-molded, not only can the molding be carried out with less necessity of interruption for mold cleaning, but also even when the continuous molding is interrupted for mold cleaning or for other reasons and then restarted, occurrence of unfavorable phenomena (such as deposition of black spots, i.e., carbonized material waste, and development of brown streaks, uneven color and the like) can be effectively suppresse…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.