Process for producing alkenyl aromatic foams using a combination of atmospheric and organic gases and foams produced thereby
US5269987A · kind A · utility
27Cited by
6References
3Claims
0Family size
Inventors
Key dates
| Filing date | Dec 22, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Dec 22, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/05
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
There is disclosed a process for producing alkenyl aromatic foams utilizing a combination of atmospheric and organic gases as blowing agent, preferably using greater than 30% by weight of atmospheric gas, and preferably also using a predetermined about of a masterbatch mix comprising a styrenic polymer, a rubbery block copolymer, and a solid blowing agent. Also disclosed are alkenyl aromatic foams produced by the process which exhibit increased densities, increased thermoforming capabilities, increased post-expansion properties, and increased retainment of the atmospheric and organic gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.