Polycarbonate compositions, articles formed therefrom, and methods of manufacture thereof
US9328240B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2012 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Feb 20, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2201/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A composition comprises a first polycarbonate having a limited oxygen index of greater than 26% measured according to ISO 4589 on a 4 mm thick plaque, wherein an article molded from the first polycarbonate has a smoke density after 4 minutes (DS-4) of greater than 600 determined according to ISO 5659-2 on a 3 mm thick plaque at 50 kW/m2; and a second polymer different from the first polycarbonate, the second polymer comprising a poly(carbonate-siloxane) copolymer, a polydialkylsiloxane, or a combination comprising at least one of the foregoing; wherein an article molded from the second polymer has a smoke density after 4 minutes (DS-4) of greater than 600 determined according to ISO 5659-2 on a 3 mm thick plaque at 50 kW/m2; wherein an article molded from the composition has a smoke density after 4 minutes (DS-4) of smaller than 480 determined according to ISO 5659-2 on a 3 mm thick plaque at 50 kW/m2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.