Expanded polypropylene films
US4638015A · kind A · utility
12Cited by
7References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1985 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Sep 30, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/908
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed are films made of expanded polypropylene, which have a uniform specific gravity d of from about 4.25.times.10.sup.-6 to about 6.50.times.10.sup.-6 Newton/mm.sup.3, a crystallization temperature of from about 115.degree. C. to about 135.degree. C. and an elastic modulus Me expressed in Newton/mm.sup.3 such that the ratio Me:d is from about 1.6.times.10.sup.8 to about 2.0.times.10.sup.8 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.