Thin polyester film containing cubic calcium carbonate particles suitable for capacitor, digital stencil and thermal transfer media
US5595819A · kind A · utility
8Cited by
1References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1995 |
| Grant date | Jan 21, 1997 |
| Priority date | — |
| Expiry date | Apr 21, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyester film is disclosed having a thickness not greater than six microns with cubic calcium carbonate incorporated therein resulting in a Kt.sup.-0.5 of at least 21, where K is a stack stiffness constant and t is film thickness in microns. The film exhibits excellent slittability and winding performance, providing film rolls of uniform hardness with sufficient compressive strength to avoid film buckling. The film can be employed in capacitors, digital stencils and thermal transfer media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.