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1. (US5294338) Porous polyethylene hollow fiber membrane of large pore diameter, production process thereof, and hydrophilized porous polyethylene hollow fiber membranes

Office : United States of America
Application Number: 07853777 Application Date: 09.06.1992
Publication Number: 5294338 Publication Date: 15.03.1994
Grant Number: 5294338 Grant Date: 15.03.1994
Publication Kind : A
Prior PCT appl.: Application Number:JP91001638 ; Publication Number: Click to see the data
IPC:
B01D 69/08
B01D 67/00
B01D 69/00
B01D 69/02
B01D 71/00
B01D 71/26
B29C 55/00
D01D 5/00
D01D 5/247
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
69
Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
08
Hollow fibre membranes
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
67
Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
69
Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
69
Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
02
characterised by their properties
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
71
Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D
SEPARATION
71
Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
06
Organic material
26
Polyalkenes
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
55
Shaping by stretching, e.g. drawing through a die; Apparatus therefor
D TEXTILES; PAPER
01
NATURAL OR ARTIFICIAL THREADS OR FIBRES; SPINNING
D
MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES, OR RIBBONS
5
Formation of filaments, threads, or the like
D TEXTILES; PAPER
01
NATURAL OR ARTIFICIAL THREADS OR FIBRES; SPINNING
D
MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES, OR RIBBONS
5
Formation of filaments, threads, or the like
24
with a hollow structure; Spinnerette packs therefor
247
Discontinuous hollow structure or microporous structure
CPC:
B01D 67/0088
B01D 67/0027
B01D 69/02
B01D 69/08
B01D 71/26
B01D 2323/02
B01D 2323/08
B01D 2325/021
B01D 2325/14
B01D 2325/20
B29C 55/005
B29K 2023/06
D01D 5/247
Applicants: Mitsubishi Rayon Co., Ltd.
Inventors: Kamo Jun
Hirai Takayuki
Takahashi Hiroshi
Kondo Kenji
Agents: Oblon, Spivak, McClelland, Maier & Neustadt
Priority Data: 02327279 28.11.1990 JP
03162354 07.06.1991 JP
Title: (EN) Porous polyethylene hollow fiber membrane of large pore diameter, production process thereof, and hydrophilized porous polyethylene hollow fiber membranes
Abstract: front page image
(EN)

Disclosed is a porous polyethylene hollow fiber membrane of large pore diameter which have (a) rectangular pores formed by microfibrils that are oriented in the lengthwise direction of the fibers and joint portions that are composed of stacked lamellae, the pores being contiguous with each other from the inner wall surface to the outer wall surface of the hollow fiber membrane to form a stacked, multicellular structure, (b) an average pore diameter ranging from greater than 2 .mu.m up to 10 .mu.m as measured with a mercury porosimeter, (c) a porosity of 75 to 95%, and (d) an air permeability of not less than 8.times.10.sup.5 l/m.sup.2 .multidot.hr.multidot.0.5 atm. This hollow fiber membrane can be produced by melt-spinning polyethylene, annealing the resulting unstretched hollow fiber under specific conditions, and then cold-stretching and hot-stretching the annealed hollow fiber under specific conditions.


Also published as:
EP0513390WO/1992/009359