Heat resistant expandable plastic particles and molded articles produced therefrom
US4438222A · kind A · utility
3Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1983 |
| Grant date | Mar 20, 1984 |
| Priority date | — |
| Expiry date | Jan 14, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F212/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention produces heat resistant expandable plastic particles by the method of emulsion polymerization, containing .alpha.-alkylstyrene 15-55 weight %, another polymerizable monomer 85-45 weight %, and a readily volatile blowing agent 3-15 weight % as chief ingredients, and offers the expandable plastic molded articles with high heat resistance and high dimensional stability produced by prefoaming the expandable polymerizate particles with heating at a pressure of more than 0.1 kg/cm.sup.2 G followed by heat-molding in a metallic mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.