Expanded particulate material of polyolefin resin
US4275023A · kind A · utility
28Cited by
11References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1980 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Aug 11, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Expanded particles of a crosslinked polyolefin resin, each particle with uniformly spherical shape, having an average diameter of 1.4 to 5.5 mm, an average expansion ratio of 18 to 37 and specific compression coefficient of 1.6 .times. 10.sup.-3 to 4.0 .times. 10.sup.-3, are found to be produced by two-step foaming operations. They are useful for various purposes such as filtrating material, fillers in stuffed specimens and, especially for preparation of molded articles having constricted portions, giving excellent moldings having smooth surface without failure at corner or edge portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.