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:
Mar. 07, 2000
Filed:
Nov. 28, 1997
Haruo Hayashida, Chiba, JP;
Eisuke Shiratani, Ichihara, JP;
Ikuo Yamamoto, Ichihara, JP;
Akihiro Ichige, Sodegaura, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
A film containing a first layer containing a propylene-based block copolymer (a) obtainable by forming 40 to 85% by weight of a propylene-ethylene copolymer portion (A) having a content of repeating unit derived from ethylene of 1.5 to 6.0% by weight in a first step, and then forming 15 to 60% by weight of a propylene-ethylene copolymer portion (B) having a content of repeating unit derived from ethylene of 7 to 17% by weight in a second step, the intrinsic viscosity of portion (B) being 2 to 5 dl/g, and the ratio of the intrinsic viscosity of portion (B) to the intrinsic viscosity of portion (A) being 0.5 to 1.8, and a second layer containing a polyethylene type resin (b) laminated on at least one surface of the first layer, has a good balance between heat resistance, flexibility, mechanical strength, transparency, cuttability, original-shape resuming property and other desirable properties, and is suitably used for wrapping materials such as foods.