Toray Industries, Inc.

Hiroki Eimura

Koichi Takada

Gohei Yamamura

Masayuki Hanakawa

Marina Otsuka

The present invention relates to a separation membrane including a thermoplastic polymer selected from a cellulose ester and a polyamide, in which, when regions obtained by dividing a cross-sectional surface perpendicular to a longitudinal direction of the separation membrane into 5 at an equal interval are defined as regions 1 to 5, all the regions 1 to 5 have a number average pore diameter changing rate &#x3b1;of &#x2212;0.25 to 0.25, and at least one of the regions 1 to 5 is a region P that satisfies conditions (a) and (b): (a) a value of area average pore diameter D/number average pore diameter Dis 2.50 to 6.00; and (b) a number average W of fine pores that are located at a distance smaller than Lfrom a center of respective coarse pores is 10 to 30.

Separation membrane and method for producing separation membrane

The present invention addresses the problem of providing a separating membrane mainly comprising a thermoplastic resin having high permeability. The present invention relates to a separating membrane including a thermoplastic resin, wherein the width of voids in the separating membrane is at least equal to 1 nm and at most equal to 1000 nm, and the curvature rate of the voids is at least equal to 1.0 and at most equal to 6.0.

Separating membrane and method for manufacturing separating membrane

The present invention addresses the problem of providing: a composite hollow-fiber membrane having high permeability and high membrane strength; and a production method therefor. The present invention pertains to a composite hollow-fiber membrane that at least has a layer (A) and a layer (B), wherein the layer (A) contains a thermoplastic resin, the layer (A) is provided with a co-continuous structure comprising voids and a phase containing the thermoplastic resin, the co-continuous structure has a structural cycle of 1-1000 nm, and the hole area rate Hof the layer (A) and the hole area rate Hof the layer (B) fulfill the relation: H&#x3c;H.

Composite hollow-fiber membrane and production method therefor

The purpose of the present invention is to provide: a separation film that consists primarily of a cellulose ester and has a high membrane strength and a high elongation degree; and a production method therefor. Provided is a separation film which has a structure comprising a cellulose ester phase and pores, wherein the average pore diameter R is 0.001-6 &#x3bc;m, the value obtained from the expression: breaking strength (MPa)&#xf7;(100&#x2212;porosity (%))&#xd7;100 is 40 or greater, and the elongation degree is 10% or greater.

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Shiga, Japan

Hiroki Eimura