The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2010
Filed:
Mar. 24, 2005
Method for producing transparent polypropylene based sheet and transparent polypropylene based sheet
Akira Funaki, Sodegaura, JP;
Masahiro Akamatsu, Hanyuu, JP;
Shigeki Yamaguchi, Sodegaura, JP;
Kenichi Mori, Sodegaura, JP;
Tomoyuki Kitajima, Sodegaura, JP;
Akira Funaki, Sodegaura, JP;
Masahiro Akamatsu, Hanyuu, JP;
Shigeki Yamaguchi, Sodegaura, JP;
Kenichi Mori, Sodegaura, JP;
Tomoyuki Kitajima, Sodegaura, JP;
Idemitsu Unitech Co., Ltd., Tokyo, JP;
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 machineincludes: an extruding unitfor melting and kneading a raw material and extruding the material into a sheet-like shape; a first cooling unitfor cooling the melted sheet-like resin compositionto obtain a sheet (sheet-like article); a preheating unitfor reheating the sheet; a heat treatment unitfor heat-treating the sheet-like resin composition; and a second cooling unitfor cooling the heat-treated sheet. The raw material of a resulting sheetcontains a polypropylene resin (a) and a metallocene-type ethylene-α-olefin copolymer (b).