Monovinylaromatic polymer with improved stress crack resistance
US5861455A · kind A · utility
9Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1997 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Mar 20, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L51/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention discloses a composition of matter consisting of a high impact polystyrene exhibiting improved environmental stress crack resistance. The HIPS material is formed utilizing polybutadiene, polyisoprene, and copolymers thereof with styrene, having a Mooney viscosity exceeding about 35 and a gel content of up to about 28%. The present invention discloses the use of a combination of lubricant additives to obtain a HIPS material with higher ESCR values than either additive alone could provide, and also discloses the optimum level of each additive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.