Separation membrane and manufacturing method therefor
AssigneeToray Industries, Inc.
InventorsMarina Taguchi, Masayuki Hanakawa, Gohei Yamamura, Koichi Takada, Hiroki Eimura, Shigeru Aoyama, Miku Akutsu
Life of this patent
Estimating the term…
Abstract
A separation membrane has high strength and low leakage property while maintaining high gas permeability using poly(4-methyl-1-pentene) excellent in chemical resistance and gas permeability. The separation membrane contains poly(4-methyl-1-pentene) as a main component, in which a ratio RA of a rigid amorphous of poly(4-methyl-1-pentene) in the separation membrane is 43% or more and 60% or less, a porosity is 30% or more and 70% or less, and a dense layer is provided on at least one surface.
Claims19
1-18. (canceled)
A separation membrane containing poly(4-methyl-1-pentene) as a main component, in which a ratio RA of a rigid amorphous defined by Equation (1) of poly(4-methyl-1-pentene) in the separation membrane is 43% or more and 60% or less, overall porosity of the separation membrane is 30% or more and 70% or less, and
- a dense layer is provided on at least one surface side of the separation membrane,
- RA (%))=100−(MA+C) (1)
- wherein MA is a ratio of a movable amorphous, and C is crystallinity.
A method of manufacturing a separation membrane, comprising (1) to (3):
- (1) a preparation step of melt-kneading a resin mixture containing 10 mass % or more and 50 mass % or less of poly(4-methyl-1-pentene) and 50 mass % or more and 90 mass % or less of a plasticizer to obtain a resin composition;
- (2) a molding step of melting the resin composition, discharging the resin composition from a discharge spinneret, cooling the resin composition in a cooling bath, and winding the resin composition at a draft ratio of 1 or more and 10 or less to obtain a resin molded product having an orientation degree of an outer surface of 1.0 or more and 1.5 or less, and a ratio of the orientation degree of the outer surface to the orientation degree of an inner surface of 1.0 or more and 1.5 or less;
- and
- (3) a stretching step of stretching the resin molded product with a magnification of 2 times or more and 6 times or less at 60° C. or more and 120° C. or less to obtain a stretched product.
Dependencies are inferred from the claim text.