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:
Sep. 26, 1989
Filed:
Aug. 22, 1986
Katsuyuki Usami, Yokohama, JP;
Toru Ueki, Yokohama, JP;
Hajime Sentoku, Tokyo, JP;
Takashi Takahashi, Kamakura, JP;
Kazuharu Kanezaki, Yokohama, JP;
Mitsui Toatsu Chemicals Inc., Tokyo, JP;
Abstract
Disclosed herein is a polypropylene sheet obtained by forming a resin composition, which contains a polypropylene resin and a hydrogenated petroleum resin in specific amounts, into a sheet at a particular chill-roll temperature and then annealing the sheet at a specific temperature for a specific period of time as well as an improved production process of such a polypropylene sheet. Also disclosed is a polypropylene sheet comprising a sheet obtained from the above resin composition and a polypropylene layer of at least 10 .mu.m thick applied on at least one side of the sheet. A polypropylene resin composition suitable for the production of such polypropylene sheets is also disclosed. The above polypropylene sheets are suitable for use in press-through packages.