Film excellent in slip characteristics and its production
US3968183A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1974 |
| Grant date | Jul 6, 1976 |
| Priority date | — |
| Expiry date | Jun 27, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyester block copolymer film excellent in slip characteristics and blocking resistance, which is prepared by melt extruding a polyester block copolymer in a film and cooling the film in a melt state at a temperature of about 40.degree. to 120.degree.C to solidify it, the polyester block copolymer comprising crystalline polyester segments and non-crystalline polymer segments in a weight ratio of 99 : 1 to 10 : 90 and having a number average molecular weight of about 10,000 to 100,000, the melting point of a self-supporting high polymer substantially constituted with the monomer components of the said crystalline polyester segments alone being not lower than about 200.degree.C and the melting point or softening point of a polymer substantially constituted with the said non-crystalline polymer segments themselves being not higher than about 80.degree.C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.