# US 5,705,445 A · Base fabric for air bags and method for the preparation thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,705,445 A - Document ID: US5705445A - Status: Granted - Kind: A - Application number: 08/488,010 - Filed: 1995-06-07 - Granted: 1998-01-06 - Earliest claimed: 1994-09-16 - Assignees: Takata Corporation; Shin-Etsu Chemical Co., Ltd. - Inventors: Tsuneo Chikaraishi; Yasushi Masuda; Hiroshi Ohashi; Yoshinobu Takahashi; Morizo Nakazato; Takeshi Fukuda - Web page: https://patentgrep.com/patent/US5705445A ## CPC - B60R 21/235: characterised by their material - C09D 183/04: Polysiloxanes - D06M 11/79: with silicon dioxide, silicic acids or their salts - D06M 15/643: containing silicon in the main chain - D06M 15/6436: {containing amino groups} - D06M 15/65: containing epoxy groups - D06N 3/128: {with silicon polymers} - Y10T 428/1362: Textile, fabric, cloth, or pile containing [e.g., web, net, woven, knitted, mesh, nonwoven, matted, etc.] - Y10T 442/2369: Coating or impregnation improves elasticity, bendability, resiliency, flexibility, or shape retention of the fabric - Y10T 442/2385: Improves shrink resistance - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS - D06N: WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Disclosed is a base fabric for automobile air bags having excellent flexibility to ensure compact folding of the air bag and high flame retardancy for safety in hazard, which consists of a woven fabric web and a rubbery coating layer formed thereon from a silicone-based coating composition in the form of an aqueous emulsion comprising: (a) 100 parts by weight of an organopolysiloxane represented by the general formula X--›--SiR.sup.1.sub.2 --O--!.sub.m --›--SiZ.sub.2 --O--!n-SiR.sup.1.sub.2 --X, in which R.sup.1 is a monovalent hydrocarbon group having 1 to 20 carbon atoms, Z is R.sup.1, OR.sup.2 or --(--O--SiR.sup.1.sub.2 --).sub.k --OR.sup.2, R.sup.2 being a hydrogen atom or R.sup.1 and k being a positive integer not exceeding 1000, X is R.sup.1 or OR.sup.2, m is a positive integer of 100 to 10,000 and n is 0 or a positive integer not exceeding 1,000 and which contains at least two OR.sup.2 groups in a molecule; (b) from 0.5 to 50 parts by weight of an organohydrogen polysiloxane having, in a molecule, at least three silicon-bonded hydrogen atoms; (c) from 0.5 to 100 parts by weight of a finely divided silica filler or a powder of an polyorganosilsesquioxane; (d) from 0.1 to 20 parts by weight of an alkoxy silane compound having, in a molecule, at least one amido group and at least one carboxyl group or a partial hydrolysis-condensation product thereof: (e) from 0.1 to 20 parts by weight of an alkoxy silane compound having, in a molecule, at least one epoxy or amino group or a partial hydrolysis-condensation product thereof; and (f) from 0.01 to 10 parts by weight of a curing catalyst for the composition. ## Claims ### Claim 1 A base fabric for air bags which comprises: (A) a woven fabric web of a synthetic fiber; and (B) a coating layer formed on at least one surface of the woven fabric web as the component (A) which is a layer cured from an organopolysiloxane composition in the form of an aqueous emulsion comprising: (a) 100 parts by weight of an organopolysiloxane, as an anionic emulsion polymerization product, represented by the general formula X--›--SiR.sup.1.sub.2 --O--!.sub.m --›SiZ.sub.2 --O--!.sub.n --SiR.sup.1.sub.2 --X, in which R.sup.1 is, independently from the others, a monovalent hydrocarbon group having 1 to 20 carbon atoms optionally substituted by halogen atoms or epoxy, carboxyl, amino or methacryl groups, each Z is, independently from the others, R.sup.1, OR.sup.2 or --(--O--SiR.sup.1.sub.2).sub.k --OR.sup.2, R.sup.2 being a hydrogen atom or R.sup.1 and the subscript k being a positive integer not exceeding 1000, each X is, independently from the other, R.sup.1 or OR.sup.2, the subscript m is a positive integer of 100 to 10,000 and the subscript n is 0 or a positive integer not exceeding 1,000 and which contains at least two groups denoted by OR.sup.2 in a molecule; (b) from 0.5 to 50 parts by weight of an organohydrogen polysiloxane, as an aqueous emulsion product, having, in a molecule, at least three hydrogen atoms directly bonded to the silicon atoms, (c) from 0.5 to 100 parts by weight of a finely divided silica filler, as a colloidal silica aqueous dispersion; (d) from 0.1 to 20 parts by weight of an alkoxy silane compound having, in a molecule, at least one amido group and at least one carboxyl group or a partial hydrolysis-condensation product thereof; (e) from 0.1 to 20 parts by weight of an alkoxy silane compound having, in a molecule, at least one epoxy group or at least one amino group or a partial hydrolysis-condensation product thereof; (f) from 0.01 to 10 parts by weight of a curing catalyst for the composition, which is a metal salt of an organic acid or an amine compound; and (g) a water-soluble polymer thickening agent; the aqueous emulsion having a viscosity in the range from 2,000 to 100,000 centipoise at 25.degree. C. and the amount of the coating layer being the range from 10 to 100 g/m.sup.2 as dried. ### Claim 2 (depends on 1) The base fabric for air bags as claimed in claim 1 in which the subscript n in the general formula representing the component (a) is 0 or a positive integer not exceeding 100. ### Claim 3 (depends on 1) The base fabric for air bags as claimed in claim 1 in which the amount of the component (c) is in the range from 1 to 50 parts by weight per 100 parts by weight of the component (a). ### Claim 4 (depends on 1) The base fabric for air bags as claimed in claim 1 in which the amount of the component (d) is in the range from 0.5 to 10 parts by weight per 100 parts by weight of the component (a). ### Claim 5 (depends on 1) The base fabric for air bags as claimed in claim 1 in which the amount of the component (e) is in the range from 0.5 to 10 parts by weight per 100 parts by weight of the component (a). ### Claim 6 (depends on 1) The base fabric for air bags as claimed in claim 1 in which the curing catalyst as the component (f) is a metal salt of an organic acid. ### Claim 7 (depends on 1) The base fabric for air bags as claimed in claim 1 in which the amount of the component (f) is in the range from 0.1 to 5 parts by weight per 100 parts by weight of the component (a). ### Claim 8 (depends on 1) The base fabric for air bags as claimed in claim 1 in which at least 90% by moles of the groups denoted by R.sup.1 in the component (a) are methyl groups. ### Claim 9 (depends on 1) The base fabric for air bags as claimed in claim 1 wherein the aqueous emulsion has a viscosity in the range form 10,000 to 50,000 centipoise at 25.degree. C. ### Claim 10 (depends on 1) The base fabric for air bags as claimed in claim 1 in which the amount of the coating layer is in the range from 20 to 50 g/m.sup.2 as dried. ### Claim 11 (depends on 1) The base fabric for air bags as claimed in claim 1 in which the water-soluble polymer is carboxymethyl cellulose. ### Claim 12 (depends on 1) The base fabric for air bags of claim 1, wherein the organohydrogen polysiloxane, (b), is of the following formula: Y--(--SiR.sup.1.sub.2 --O--).sub.a --(--SiHR.sup.1 --O--).sub.b --SiR.sup.1.sub.2 --Y wherein R.sup.1 is as defined, Y is a hydrogen atom or independently has a meaning of R.sup.1 and a and b are each a positive integer not exceeding 1000, provided that, when b is 1, each Y is a hydrogen atom and, when b is 2, at least one Y is a hydrogen atom. ### Claim 13 (depends on 1) The base fabric for air bags of claim 1, wherein the woven fabric web of synthetic fiber is of a polyamide, polyester, acrylic or aramid fiber. ### Claim 14 (depends on 1) The base fabric for air bags of claim 1, wherein the woven fabric web has a coating layer on only one side. ### Claim 15 (depends on 1) The base fabric for air bags of claim 1, wherein the organopolysiloxane composition is free from an organic solvent. ### Claim 16 (depends on 1) The base fabric for air bags of claim 1, wherein in the organopolysiloxane, (a), each R.sup.1 is independently a saturated aliphatic or alicyclic hydrocarbon group of 1-20 carbon atoms optionally substituted by halogen atoms or epoxy, carboxyl or amino groups. ### Claim 17 (depends on 1) The base fabric for air bags of claim 1, wherein in the organopolysiloxane, (a), each R.sup.1 is a methyl group. ### Claim 18 An air bag for an automobile which is a foldable and inflatable bag formed by sewing together pieces of a base fabric which comprises: (A) a woven fabric web of a synthetic fiber; and (B) a coating layer formed on at least one surface of the woven fabric web as the component (A) which is a layer cured from an organopolysiloxane composition in the form of an aqueous emulsion comprising: (a) 100 parts by weight of an organopolysiloxane, as an anionic emulsion polymerization product, represented by the general formula X--›--SiR.sup.1.sub.2 --O--!.sub.m --›SiZ.sub.2 --O--!.sub.n --SiR.sup.1.sub.2 --X, in which R.sup.1 is, independently from the others, a monovalent hydrocarbon group having 1 to 20 carbon atoms optionally substituted by halogen atoms or epoxy, carboxyl, amino or methacryl groups, each Z is, independently from the other, R.sup.1, OR.sup.2 or --(--O--SiR.sup.1.sub.2).sub.k -- OR.sup.2, R.sup.2 being a hydrogen atom or R.sup.1 and the subscript k being a positive integer not exceeding 1,000, each X is, independently from the other, R.sup.1 or OR.sup.2, the subscript m is a positive integer of 100 to 10,000 and the subscript n is 0 or a positive integer not exceeding 1,000 and which contains at least two groups denoted by OR.sup.2 in a molecule; (b) from 0.5 to 50 parts by weight of an organohydrogen polysiloxane, as an aqueous emulsion product, having, in a molecule, at least three hydrogen atoms directly bonded to the silicon atoms, (c) from 0.5 to 100 parts by weight of a finely divided silica filler, as a colloidal silica aqueous dispersion; (d) from 0.1 to 20 parts by weight of an alkoxy silane compound having, in a molecule, at least one amido group and at least one carboxyl group or a partial hydrolysis-condensation product thereof; (e) from 0.1 to 20 parts by weight of an alkoxy silane compound having, in a molecule, at least one epoxy group or at least one amino group or a partial hydrolysis-condensation product thereof; (f) from 0.01 to 10 parts by weight of a curing catalyst for the composition, which is a metal salt of an organic acid or an amine compound; and (g) a water-soluble polymer thickening agent; the aqueous emulsion having a viscosity in the range from 2,000 to 100,000 centipoise at 25.degree. C. and the amount of the coating layer being in the range from 10 to 100 g/m.sup.2 as dried. ### Claim 19 (depends on 18) The air bag of claim 18, wherein in the organopolysiloxane, (a), each R.sup.1 is independently a saturated aliphatic or alicyclic hydrocarbon group of 1-20 carbon atoms optionally substituted by halogen atoms or epoxy, carboxyl or amino groups. ### Claim 20 (depends on 18) The air bag of claim 18, wherein in the organopolysiloxane, (a), each R.sup.1 is a methyl group.