Fire retarding polypropylene composition
US6348122B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 8, 1998 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | Jan 8, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2003/2217
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A fire retarding polypropylene composition comprising a copolymer of polypropylene and an ethylene/propylene rubber, and at least about 50% by weight but not greater than 60% by weight of a magnesium hydroxide coated with an anionic surface active agent, the magnesium hydroxide having (i) a strain in the <101> direction of not more than 3.0×10−3, (ii) a crystallite size in the <101> direction of more than 800 å, and (iii) a specific surface area, determined by the BET method, of less than 20 mg2/g. The composition can be used in a fire retarding semiconductor apparatus which passes the FMRC Clean Room Materials Flammability Test Protocol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.