Polyester film comprising alumina and silane coupling agent
US5718971A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1995 |
| Grant date | Feb 17, 1998 |
| Priority date | — |
| Expiry date | Dec 21, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A biaxially oriented polyester film comprises: 0.01 to 4 wt % of .gamma., .delta.- .theta.-alumina or a mixture thereof having an average particle diameter ranging from 0.005 to 3 .mu.m and a Mohs hardness of 6 or more; 0.05 to 5 wt %, based on the amount of the alumina employed, of a silane coupling agent of the following formula (I); and, optionally, 0.01 to 4 wt % of spherical silica particle having an average particle diameter ranging from 0.005 to 3 .mu.m: EQU R.sub.1 --R.sub.2 --Si--(OR.sub.3).sub.3 (I) wherein, PA1 R.sub.1 is a methacryl, an acryl, a glycidyl or an amino group; PA1 R.sub.2 is a C.sub.1-5 alkylene group; and PA1 R.sub.3 is a C.sub.1-3 alkyl group. The film has improved transparency as well as surface properties, and is especially useful as labels, window coating films, photoresists and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.