Process for producing stretched porous film
US5853638A · kind A · utility
13Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1997 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Jun 27, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/04
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for producing a porous film, which includes melt-molding a composition prepared by compounding 100 parts by weight of a polyethylene resin mixture of low density polyethylene, linear low density polyethylene, and medium density polyethylene, 50-200 parts by weight of an inorganic filler coated with stearic acid, and 0.1-30 parts by weight of polyethylene wax into film, and stretching the resulting film by an area stretching ratio of 1.5-36 times. The process of the preferred embodiment coats the inorganic filler by floating the inorganic filler with air pressure and spraying the coating onto the floating filler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.