Foamed polypropylene sheet having improved appearance and a foamable polypropylene composition therefor
US6521675B1 · kind B1 · utility
56Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1999 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Aug 31, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Foamable polypropylene composition comprising a polypropylene resin having an D1238L melt flow rate of from about 0.5 to about 30 g/10 min, and a method for extruding rigid, foamed polypropylene sheet with improved surface appearance having a density in the range 0.4 to about 0.8 g/cm3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.