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:
Jul. 02, 2019
Filed:
Mar. 18, 2015
Tosoh Corporation, Shunan-shi, Yamaguchi, JP;
TOSOH CORPORATION, Shunan, JP;
Abstract
To provide an ultrahigh molecular weight polyethylene stretched microporous film having high strength and heat resistance. An ultrahigh molecular weight polyethylene stretched microporous film, which comprises at least an ultrahigh molecular weight polyethylene having an intrinsic viscosity ([η]) of at least 7 dl/g and at most 60 dl/g, and which has a porosity of at least 10% and at most 70% and a breaking stress of at least 1 MPa when melt-stretched at 150° C., which uses, as the ultrahigh molecular weight polyethylene, preferably ultrahigh molecular weight polyethylene particles which satisfy (1) an intrinsic viscosity ([η]) of at least 7 dl/g and at most 60 dl/g, (2) a bulk density of at least 130 kg/mand at most 700 kg/m, and (3) ΔTm (ΔTm=Tm−Tm) of at least 9° C. and at most 30° C., which is a difference between the melting point (Tm) at the 1st scanning and the melting point (Tm) at the 2nd scanning measured by DSC.