Process of producing porous thermoplastic resin article
US4563317A · kind A · utility
6Cited by
3References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1984 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Dec 27, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/42
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process of producing a porous thermoplastic resin article in the form of hollow yarn or film which comprises a step for forming a large number of micropores in the article by drawing an article, which is characterized in that the drawing process is performed in a medium selected from the group consisting of nitrogen, oxygen, argon, carbon monoxide and a hydrocarbon such as methane or ethane at a temperature in the range of the freezing point to 50.degree. C. above the boiling point of said medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.