Manufacture of polymeric products
US4880592A · kind A · utility
176Cited by
11References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1986 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Dec 8, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/3192
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
HB polymers, such as copolymers of hydroxy butyric acid and hydroxy valeric acid, are provided as melt extruded films having a thickness of 5 to 200 .mu.m. Sheet materials may consist of such a film or the film may be laminated with other films to increase strength or impermeability. The films are best made by co-extrusion with a thermoplastic that is substantially non-tacky upon solidification. The sheet materials are of particular value as diaper backsheets and ostomy bags. They may include a layer of non-woven material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.