Method for producing a foamed resin using a blowing and extracting agent
US5133913A · kind A · utility
12Cited by
15References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1989 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Dec 13, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J9/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
There is disclosed a method for producing a foamed resin which incolves the steps of removing volatile substances from a polymer by contacting the polymer with an extractant and foaming the purified polymer by using the same extractant dissolved in the polymer as a foaming agent. According to the disclosure the purification and blowing of a polymer can be carried out efficiently and economically with a purification sufficient to meet market demand and with a desired blowing expansion rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.