Biaxially drawn, filled polyester film substrates
US4654249A · kind A · utility
21Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1984 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Jul 13, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Biaxially drawn, filled polyester film substrates, well adapted for the manufacture of magnetic recording tapes, are comprised of a biaxially stretched thermoplastic film matrix including a particulate filler material distributed therethrough, said filler material comprising (a) from about 0.01% to 1% by weight thereof of kaolinite particles having a mean particle size no greater than about 1 micron, and (b) from about 0.01% to 1% by weight thereof of titanium oxide particles also having a mean particle size no greater than about 1 micron.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.