Method for producing transparent polypropylene based sheet and transparent polypropylene based sheet
US7691306B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2005 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Nov 29, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/0815
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a transparent polypropylene based sheet and its manufacturing method capable of: providing proper properties as a transparent sheet such as tensile characteristic, impact resistance, rigidity and little generation of whitening when being folded as well as maintaining transparency; preventing generation of a gum-like material in molding; and realizing continuous production. A manufacturing machine 1 includes: an extruding unit 11 for melting and kneading a raw material and extruding the material into a sheet-like shape; a first cooling unit 12 for cooling the melted sheet-like resin composition 20a to obtain a sheet (sheet-like article) 20; a preheating unit 13 for reheating the sheet 20; a heat treatment unit 14 for heat-treating the sheet-like resin composition 20; and a second cooling unit 15 for cooling the heat-treated sheet 20. The raw material of a resulting sheet 21 contains a polypropylene resin (a) and a metallocene-type ethylene-α-olefin copolymer (b).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.