Foam made from modified polypropylene resin and process for the production thereof
US6077878A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1997 |
| Grant date | Jun 20, 2000 |
| Priority date | — |
| Expiry date | Dec 17, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2351/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a foamed article comprising a modified polypropylene resin which is a graft copolymer of a polypropylene resin and an aromatic vinyl monomer and has an average number of the grafted aromatic vinyl chains of not less than 1 in one molecule of the graft copolymer and a weight average molecular weight of the grafted aromatic vinyl chains of not less than 200, and relates to a process for preparation thereof. According to the present invention, the foamed article comprising the polypropylene resin and having a high closed cell content, a high expansion ratio and good external appearance can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.