Extruded foams having a monovinyl aromatic polymer with a broad molecular weight distribution
US5650106A · kind A · utility
17Cited by
2References
10Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 21, 1996 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Jun 21, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2325/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is an extruded, linear, bimodal monovinyl aromatic polymer foam having a weight average molecular weight of from about 100,000 to about 200,000, greater than 5 percent by weight of its polymer chains having a weight average molecular weight of 500,000 to 1,000,000, and less than 5 percent by weight of its polymer chains having a weight average molecular weight of greater than 1,000,000. Use of the polymer enables process pressure drop to be significantly reduced and allows the formation of a foam of lower density and larger cross-section. Further disclosed is a process for making the extruded foam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.