Expanded particles of polyolefin resin and process for producing same
US4448901A · kind A · utility
53Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 1983 |
| Grant date | May 15, 1984 |
| Priority date | — |
| Expiry date | May 13, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/09
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The mixture of water and the polyolefin resin particles impregnated with a volatile blowing agent are released from the interior of the pressure-resistant container under a constant temperature and constant pressure preferably keeping the partial pressure of the blowing agent constant, through at least one orifice having an area of 0.07 to 300 mm.sup.2, into a low-pressure zone. This invention gives various advantages when applied to the practical process resulting in expanded particles with superior properties which are free of blocking and remarkably uniform in the degree of expansion, and are useful for molding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.