Propylene polymer foams
US6417242B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2001 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Oct 2, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2203/14
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a foam, a process for preparing the foam and an article containing the foam. The foam contains a coupled propylene polymer and has a density in of from 9.6 to 801 kg/m3 and has either a foamability factor of more than 1.8 to less than 2.8 and an open cell content less than 20 percent, or a foamability factor of at least 2.8 and less than 15 and an open cell content of less than 50 percent. The process includes heating a coupled propylene polymer having a melt flow rate from 0.2 to 20 g/10 min and a melt strength of at least 39 cN to a molten state to produce a molten polymer material and mixing said molten polymer material with a blowing agent under conditions to produce a foamed material having a density in the range of from 9.6 to 801 kg/m3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.