Teijin Limited

Ayumi Iwai

Satoshi Nishikawa

Takashi Yoshitomi

Atsuhiro Otsuka

Koji Furuya

Takao Ohno

Yu Nagao

Yoshikazu Ikuta

The present disclosure provides a substrate for a liquid filter, including: a polyolefin microporous membrane, in which a mean flow pore size in a pore size distribution of the polyolefin microporous membrane measured by a half dry method according to gas-liquid phase substitution is from 1 nm to 50 nm, a calcium content in the polyolefin microporous membrane is 2,000 ppb or less, and a ratio of a tensile elongation in a longitudinal direction (MD) to a tensile elongation in a width direction (TD) perpendicular to the longitudinal direction (MD/TD tensile elongation ratio) of the polyolefin microporous membrane is from 0.47 to less than 0.96 or from more than 1.25 to 7.

Base material for liquid filters

A substrate for a liquid filter contains a polyolefin microporous membrane. A mean flow pore size din a pore size distribution of the polyolefin microporous membrane measured by a half dry method according to gas-liquid phase substitution is from 1 nm to 20 nm. A mean flow pore size din a pore size distribution of the polyolefin microporous membrane measured by a half dry method according to liquid-liquid phase substitution is from 1 nm to 15 nm. A difference (d−d) between the mean flow pore size dand the mean flow pore size dis 12 nm or less, and a thickness of the polyolefin microporous membrane is from 4 to 25 μm.

Substrate for liquid filter

The present invention provides a separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed at one or both sides of the porous substrate, that contains polyvinylidene fluoride resin A and polyvinylidene fluoride resin B, and that has a porosity of from 30% to 60% and an average pore size of from 20 nm to 100 nm.

Separator for a non-aqueous secondary battery and non-aqueous secondary battery

A separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed on one side or both sides of the porous substrate and contains the following resin A and the following resin B. Resin A: a polyvinylidene fluoride resin containing structural units derived from vinylidene fluoride (VDF) and structural units derived from hexafluoropropylene (HFP), a total content ratio of structural units derived from HFP in each of the VDF copolymers being from 0.5 mol % to 1.5 mol % of a total content of structural units in each of the VDF copolymers; and Resin B: a polyvinylidene fluoride resin containing structural units derived from VDF and structural units derived from HFP, a total content ratio of structural units derived from HFP in each of the VDF copolymers being greater than 1.5 mol % of a total content of structural units in each of the VDF copolymers.

Provided is a separator for a nonaqueous electrolyte battery, which includes a porous substrate and an adhesive porous layer that is provided on at least one side of the porous substrate and contains an adhesive resin. The separator has a pore size distribution such that, as measured by a pore size distribution measurement test, the pore size at the maximum value of the maximum peak is within a range of 0.02 &#x3bc;m to 0.1 &#x3bc;m, and the pore size distribution range value &#x3b5; defined as follows is 0.4 or less. The pore size distribution range value &#x3b5; herein is a value calculated by the following equation from pore sizes D, D, and Dcorresponding to cumulative pore size distributions of 90%, 10%, and 50%, respectively:pore size distribution range value &#x3b5;=(90&#x2212;10 )/50.

Separator for nonaqueous electrolyte battery, and nonaqueous electrolyte battery

A separator for a non-aqueous secondary battery includes a porous substrate and an adhesive porous layer provided on one or both sides of the porous substrate, the adhesive porous layer including a polyvinylidene-fluoride resin and a filler whose difference between a particle diameter at 90% cumulative volume and a particle diameter at 10% cumulative volume is 2 &#x3bc;m or less, and the adhesive porous layer satisfying Inequality (1): 0.5&#x2266;a/r&#x2266;3.0, wherein, in Inequality (1), 'a' represents an average thickness (&#x3bc;m) of the adhesive porous layer on one of the sides of the porous substrate; and 'r' represents a volume average particle diameter (&#x3bc;m) of the filler contained in the adhesive porous layer.

Separator for non-aqueous secondary battery and non-aqueous secondary battery

Provided is a non-aqueous-secondary-battery separator including: a microporous membrane; and an adhesive porous layer which is provided on one or both surfaces of the microporous membrane and includes a fibrillar polyvinylidene fluoride resin, in which an average hole diameter acquired from the specific surface area of the microporous membrane is greater than 90 nm and equal to or smaller than 250 nm, peeling strength between the microporous membrane and the adhesive porous layer is equal to or greater than 0.10 N/cm, and a fibrillar diameter acquired from the specific surface area of the adhesive porous layer is from 50 nm to 70 nm.

Non-aqueous-secondary-battery separator and non-aqueous secondary battery

The present invention provides a separator for a non-aqueous secondary battery including a porous substrate and an adhesive porous layer that is formed at at least one side of the porous substrate and contains the following polyvinylidene fluoride-based resin A and the following polyvinylidene fluoride-based resin B. (1) Polyvinylidene fluoride resin A selected from the group consisting of vinylidene fluoride homopolymers having a weight average molecular weight of from 600,000 to 2,500,000, and vinylidene fluoride copolymers having a weight average molecular weight of from 600,000 to 2,500,000 and containing a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene, the total content of structural units derived from hexafluoropropylene in each of the vinylidene fluoride copolymers being 1.5 mol % or less of the total content of structural units in each of the vinylidene fluoride copolymer. (2) Polyvinylidene fluoride resin B containing a structural unit derived from vinylidene fluoride and a structural unit derived from hexafluoropropylene, the total content of structural units derived from hexafluoropropylene in the polyvinylidene fluoride resin B being greater than 1.5 mol % of the total content of structural units in the polyvinylidene fluoride resin B.

Growing community of inventors

Iwakuni, Japan

Ayumi Iwai