Foamed liquid crystal polymer film/sheet having improved flexibility and cell uniformity
US5210107A · kind A · utility
2Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1991 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Jan 17, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L67/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A flexible foamed liquid crystal polymer film or sheet having uniformly small cells or bubbles. The foam cells are essentially spherical and have mean diameters less than or equal to approximately 250 microns. The cell size distribution is relatively small. The foamed sheet is made by extruding the polymer through a die under pressure at a temperature near or below the polymer's melting point; a gas or chemical blowing agent is extruded with the polymer to produce foaming as the polymer exits the die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.