# US 10,370,796 B2 · Paper composite, packaging material, and production method of paper composite > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,796 B2 - Document ID: US10370796B2 - Status: Granted - Kind: B2 - Application number: 15/504,730 - Filed: 2015-08-19 - Published: 2017-09-21 - Granted: 2019-08-06 - Earliest claimed: 2014-08-19 - Assignees: Kuraray Co., Ltd.; AGC Inc. - Applicants: Kuraray Co., Ltd.; AGC Inc. - Inventors: Masako Kawagoe; Yosuke Kumaki; Sho Masuda; Junsuke Kawana - Web page: https://patentgrep.com/patent/US10370796B2 ## CPC - D21H 19/20: comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds - B65D 65/40: Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)} - B65D 65/42: Applications of coated or impregnated materials - D21H 17/11: Halides - D21H 19/22: Polyalkenes, e.g. polystyrene - D21H 21/14: characterised by function or properties in or on the paper (D21H19/66, D21H27/02 take precedence) - D21H 21/16: Sizing or water-repelling agents - D21H 23/22: Addition to the formed paper - D21H 27/10: Packing paper (packaging materials of special type or form B65D65/38) - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES ## Abstract The paper composite contains: a paper substrate having an air permeation resistance of 1,000 sec or less and bulk density of from 0.5 to 1.0 g/cm3; and a greaseproof layer on at least one side thereof, the greaseproof layer containing an ethylene-vinyl alcohol polymer (A) and a cationic fluorine-containing polymer (B) having two specific constitutional units. A content of the copolymer (B) in the greaseproof layer is from 5 to 50 parts by mass with respect to 100 parts by mass of the polymer (A), an amount of the greaseproof layer on dry mass basis is from 0.1 to 3.0 g/m2, and a water vapor permeability of the paper composite is 1,000 g/m2·24 h or greater. ## Claims ### Claim 1 A paper composite comprising: a paper substrate having an air permeation resistance of 1,000 sec or less and a bulk density of 0.5 g/cm3 or greater and 1.0 g/cm3 or less; and a greaseproof layer formed on at least one surface side of the paper substrate, wherein the greaseproof layer comprises: a vinyl alcohol polymer (A) having a content of an ethylene unit of 2 mol % or greater and 10 mol % or less, a viscosity average degree of polymerization of 300 or greater and 2,000 or less, and a degree of saponification of 91.5 mol % or greater and 99.5 mol % or less; and a cationic fluorine-containing copolymer (B) having: a constitutional unit derived from a monomer (a) being a (meth)acrylate having a polyfluoroalkyl group having 1 to 6 carbon atoms; and a constitutional unit derived from a monomer (b) being a compound represented by formula (1): CH2═C(R1)COO-Q-N(R2)(R3), wherein R1 represents a hydrogen atom or a methyl group; Q represents: an alkylene group having 2 to 3 carbon atoms in which a part or all of hydrogen atoms are substituted with a hydroxyl group, or an alkylene group having 2 to 4 carbon atoms; and R2 and R3 each independently represent a benzyl group or an alkyl group having 1 to 8 carbon atoms, or R2 and R3 taken together represent a morpholino group, a piperidino group or a pyrrolidinyl group together with the nitrogen atom, a content of the cationic fluorine-containing copolymer (B) is 5 parts by mass or greater and 50 parts by mass or less with respect to 100 parts by mass of the vinyl alcohol polymer (A), an amount of the greaseproof layer being overlaid on dry mass basis is 0.1 g/m2 or greater and 3.0 g/m2 or less, and a water vapor permeability of the paper composite is 1,000 g/m2·24 h or greater. ### Claim 2 (depends on 1) The paper composite according to claim 1, wherein the cationic fluorine-containing copolymer (B) has: a content of the constitutional unit derived from the monomer (a) of 50% by mass or greater and 98% by mass or less; and a content of the constitutional unit derived from the monomer (b) of 2% by mass or greater and 50% by mass or less. ### Claim 3 (depends on 1) A packaging material comprising the paper composite according to claim 1. ### Claim 4 A production method of a paper composite, the production method comprising: coating the at least one surface side of a paper substrate with a composition for forming a greaseproof layer, the paper substrate having an air permeation resistance of 1,000 sec or less and a bulk density of 0.5 g/cm3 or greater and 1.0 g/cm3 or less, and the composition for forming a greaseproof layer comprising: a vinyl alcohol polymer (A) having a content of an ethylene unit of 2 mol % or greater and 10 mol % or less, a viscosity average degree of polymerization of 300 or greater and 2,000 or less, and a degree of saponification of 91.5 mol % or greater and 99.5 mol % or less; and a cationic fluorine-containing copolymer (B) having: a constitutional unit derived from a monomer (a) being a (meth)acrylate having a polyfluoroalkyl group having 1 to 6 carbon atoms; and a constitutional unit derived from a monomer (b) being a compound represented by formula (1): CH2═C(R1)COO-Q-N(R2)(R3), wherein R1 represents a hydrogen atom or a methyl group; Q represents: an alkylene group having 2 to 3 carbon atoms in which a part or all of hydrogen atoms are substituted with a hydroxyl group, or an alkylene group having 2 to 4 carbon atoms; and R2 and R3 each independently represent a benzyl group or an alkyl group having 1 to 8 carbon atoms, or R2 and R3 taken together represent a morpholino group, a piperidino group or a pyrrolidinyl group together with the nitrogen atom; and drying the paper substrate having been subjected to the coating, to obtain a paper composite comprising: the paper substrate; and a greaseproof layer formed on the at least one surface side of the paper substrate, wherein a content of the cationic fluorine-containing copolymer (B) is 5 parts by mass or greater and 50 parts by mass or less with respect to 100 parts by mass of the vinyl alcohol polymer (A), an amount of the greaseproof layer being overlaid on dry mass basis is 0.1 g/m2 or greater and 3.0 g/m2 or less, and a water vapor permeability of the paper composite is 1,000 g/m2·24 h or greater.