# US 10,374,247 B2 · Porous support, preparation method therefor, and reinforced membrane containing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,247 B2 - Document ID: US10374247B2 - Status: Granted - Kind: B2 - Application number: 15/119,040 - Filed: 2015-02-24 - Published: 2016-12-08 - Granted: 2019-08-06 - Earliest claimed: 2014-02-25 - Assignees: Kolon Fashion Material. Inc. - Applicants: Kolon Fashion Material. Inc. - Inventors: Heung Ryul Oh; Sung Jin Kim; Yong Hwan Lee; Hwan Kwon Rho; Chul Ki Kim; Jeong Young Choi; Jun Young Park; Ji Suk Baek - Web page: https://patentgrep.com/patent/US10374247B2 ## CPC - H01M 8/1062: characterised by the physical properties of the porous support, e.g. its porosity or thickness - D04H 1/4342: Aromatic polyamides - D04H 1/43838: {Ultrafine fibres, e.g. microfibres} - D04H 1/54: by welding together the fibres, e.g. by partially melting or dissolving (in combination with needling D04H1/485) - D04H 1/728: by electro-spinning {(electro-spinning methods and apparatus D01D5/0007)} - D06C 3/00: Stretching, tentering or spreading textile fabrics; Producing elasticity in textile fabrics (shaping or stretching tubular fabrics upon cores or internal frames D06C5/00) - D06C 7/00: Heating or cooling textile fabrics - D06C 15/00: Calendering, pressing, ironing, glossing or glazing textile fabrics (for making patterns or designs D06C23/00) - Y02E 60/50: Fuel cells - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B) - D06C: FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The present invention relates to a porous support, a preparation method therefor, and a reinforced membrane containing the same, wherein the porous support comprises a nanoweb in which nanofibers are integrated in the form of a nonwoven fabric comprising a plurality of pores, and the nanoweb has an elongation at break of 1-10%. The porous support has excellent air permeability and water permeability, remarkable durability, heat resistance and chemical resistance, and excellent mechanical strength and processability. ## Claims ### Claim 1 A porous support comprising a nanoweb in which nanofibers are integrated in the form of a non-woven fabric including a plurality of pores, wherein the nanoweb has a porosity of 70 to 95% and an elongation at break of 1 to 10%, and wherein the nanoweb has a strain of 10 length % or less, said strain being determined by standing a sample of the nanoweb with a width 100 mm and a length of 100 mm at 200° C. for 24 hours and calculating an average of width strain and length strain, before and after standing, and wherein the nanoweb has an intermediate elongation of 0.7 to 5% under a load of 10.204 gf. ### Claim 2 (depends on 1) The porous support according to claim 1, wherein the nanoweb has a tensile strength of 10 to 50 MPa. ### Claim 3 (depends on 1) The porous support according to claim 1, wherein the nanoweb has a mean thickness of 5 to 50 μm. ### Claim 4 (depends on 1) The porous support according to claim 1, wherein the nanoweb has a basis weight of 2 to 10 g/m2. ### Claim 5 (depends on 1) The porous support according to claim 1, wherein the nanoweb is a polyimide nanoweb. ### Claim 6 A method of manufacturing a porous support comprising: spinning a spinning solution to form a nanoweb precursor which includes in which nanofibers are integrated in the form of a non-woven fabric including a plurality of pores; and curing the nanoweb precursor while transferring the nanoweb precursor by a roll-to-roll method under the condition that a MD tension is equal to a TD tension, wherein the nanoweb has a strain of 10 length % or less, said strain being determined by standing a sample of the nanoweb with a width 100 mm and a length of 100 mm at 200° C. for 24 hours and calculating an average of width strain and length strain, before and after standing, and wherein the nanoweb has an intermediate elongation of 0.7 to 5% under a load of 10.204 gf. ### Claim 7 (depends on 6) The method according to claim 6, wherein the spinning solution is a solution comprising polyamic acid having a solid content of 11.5 to 13.5% by weight. ### Claim 8 (depends on 6) The method according to claim 6, further comprising calendering the nanoweb precursor at a linear pressure of 80 to 200 kgf/cm before curing the nanoweb precursor. ### Claim 9 (depends on 6) The method according to claim 6, wherein the curing the nanoweb precursor comprises curing the nanoweb precursor to adjust a transverse direction curing shrinkage of the nanoweb precursor to 5 to 15%. ### Claim 10 (depends on 6) The method according to claim 6, wherein the curing the nanoweb precursor is carried out at a temperature of 80 to 650° C. ### Claim 11 (depends on 6) The method according to claim 6, wherein the transferring the nanoweb precursor by a roll-to-roll method comprises transferring the nanoweb precursor by a roll-to-roll method without tension. ### Claim 12 (depends on 6) The method according to claim 6, wherein the transferring the nanoweb precursor by a roll-to-roll method is carried out while applying a tension identical to tension, which is applied to the machine direction of the nanoweb precursor, in the transverse direction of the nanoweb precursor with a roller, after rolling the nanoweb precursor with the roller. ### Claim 13 (depends on 1) A reinforced membrane comprising: the porous support according to claim 1; and an ion exchange polymer filling pores of the porous support.