Method of manufacturing an artificial paper
US3993718A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1975 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Jan 6, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/931
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process and a composition for the manufacture of an artificial paper requiring neither calendering nor biorientation, the paper obtained having in addition to the characteristics proper to cellulose paper, improved physical properties, such as better impermeability to water vapor and air, resistance to greases and dimensional stability under various atmospheric conditions. The paper is produced by homogenizing in a conventional rotary mixer a composition containing (a) a specific class of rigid polyolefins which provides the necessary stiffness of the paper and constitutes its framework, (b) a polymer which is incompatible with the rigid polyolefin selected from the homopolymers and copolymers containing a preponderant amount of styrene and which provides the hardness and tearability of the paper, (c) a macromolecular material producing compatibility between (a) and (b) which is a mixture prepared in advance from at least one homopolymer of ethylene, propylene or butylene, and at least one homopolymer of isobutylene, butadiene or isoprene, or butyl rubber, and (d) an inorganic filler, subjecting the thus homogenized mixture directly to extrusion t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.