Forming shaped articles from orientable polymers and polymer microbeads
US5141685A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1990 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Dec 11, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/47
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a method of forming shaped articles having a continuous phase of an oriented thermoplastic polymer containing cross-linked polymer microbeads at least partially bordered by void space. The thermoplastic polymer in molten form is mixed with a plurality of the crosslinked polymer microbeads, and the mixture is then formed into a shaped article. The article is stretched in at least one direction to orient it. The orienting conditions and the character and quantity of crosslinked polymer microbeads is effective to form voids in the article at least bordering the microbeads on sides thereof in the direction(s) of orientation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.