US12573652USUSPTO Grant XML

Substrate for composite membrane

A substrate for a composite membrane includes a microporous polyolefin membrane for carrying a hydrophilic resin compound within the pores of the microporous membrane wherein: the average pore diameter is 1 nm to 50 nm; the porosity is 50% to 78%; the membrane thickness is 1 m to 12 m; and, when a mixed solution of ethanol and water (volume ratio 1/2) is dripped onto a surface of the microporous polyolefin membrane which has not undergone hydrophilization treatment, the contact angle 1 between the droplet and the surface is 0 to 90 degrees 1 second after the dripping, and the contact angle 2 between the droplet and the surface is 0 to 70 degrees 10 minutes after the dripping, and the rate of change of the contact angle (( 1 2)/ 1 100) is 10 to 50%.

Patent

Brief

Patent brief

Problem

How can microplastics and similar contaminants be removed from wastewater?

Novelty

Membrane filtration is reinforced by front-page matches on porous membrane.

Uses

Wastewater treatment, Industrial effluent, Water cleanup

Assignee

TEIJIN LIMITED

Published

Mar 10, 2026

Inventors

Takeo Yamaguchi, Yuhei Oshiba, Hidenori Ohashi, Jin Tomatsu, Koji Furuya, Takao Ohno, Mami Nanbu

Domain

Environmental systems

Plain-English summary

Problem

How can microplastics and similar contaminants be removed from wastewater?

Solution

substrate for a composite membrane includes a microporous polyolefin membrane for carrying a hydrophilic resin compound within the pores of the microporous membrane wherein: the average pore diameter is 1 nm to 50 nm; the porosity is 50% to 78%; the membrane thickness is 1 m to 12 m; and, when a mixed solution of ethanol and water (volume ratio 1/2) is dripped onto a surface of the microporous polyolefin membrane which has not undergone hydrophilization treatment, the contact angle 1 between the droplet and the surface is 0 to 90 degrees 1 second after the dripping, and the contact angle 2 between the droplet and the surface is 0 to 70 degrees 10 minutes after the dripping, and the rate of change of the contact angle (( 1 2)/ 1 100) is 10 to 50%.

Key novelty

Membrane filtration is reinforced by front-page matches on porous membrane.

Applications

Wastewater treatmentIndustrial effluentWater cleanup

Relevant search intents

porous membrane

Claims preview

1 . A substrate comprising a microporous polyolefin membrane, the substrate being of a mono-layer structure wherein: the average pore size is 1 nm to 50 nm; the porosity is 50% to 78%; the membrane thickness is 1 m to 10 m; the Gurley value as measured according to JIS P8117 is 90 s/100 cc or less; and wherein the polyolefin consists of a polyethylene composition comprising a high molecular weight polyethylene with a mass average molecular weight of 900,000 or more and a low molecular weight polyethylene with a mass average molecular weight of 200,000 to 800,000 mixed at a mass ratio of 20:80 to 80:20. 2 . The substrate according to claim 1 , wherein the substrate for a composite membrane can be impregnated with a liquid which is a solvent for the hydrophilic resin compound and has a surface free energy of 35 to 36.5 mJ/m 2 . 3 . The substrate according to claim 2 , wherein the substrate for a composite membrane can be impregnated with a mixture of ethanol and water in which the water concentration is greater than 65.8% by volume to 70.6% by volume or less.

Linked approaches

Membrane filtration

Fine filtration methods for capturing microplastics and fine contaminants.

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