Method for producing transparent polypropylene sheet and transparent polypropylene sheet
US7169855B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2002 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | Dec 6, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus (1) for producing a transparent polypropylene sheet, which comprises a sheet formation means (11) for melt-kneading a resin composition comprising (A) 60 to 97 mass % of a polypropylene resin having an iostactic pentad proportion of 0.85 to 0.99 and a melt index of 2 to 10 g/10 min and (B) 40 to 3 mass % of a polypropylene resin having a racemic pentad proportion [rrrr/(1-mmmm)] of 0.15 to 0.50 and a melt index of 2 to 10 g/10 min and extruding it into s sheet, a first cooling means (12) for cooling a sheet (20) into a solid, a preheating means (13) for re-heating the cooled sheet (20), a heat treatment means (14) for heat-treating the sheet (20) into a sheet (21) and a second cooling means (15) for cooling the sheet (21) after heat treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.