# US 2019/0169394 A1 · Flexible foam formulation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0169394 A1 - Document ID: US20190169394A1 - Status: Published application - Kind: A1 - Application number: 16/321,065 - Filed: 2017-07-28 - Published: 2019-06-06 - Earliest claimed: 2016-07-28 - Assignees: Sika Technology AG - Applicants: Sika Technology AG - Inventors: Natalie WAGNER - Web page: https://patentgrep.com/patent/US20190169394A1 ## CPC - C08J 9/141: {Hydrocarbons} - C08G 18/12: using two or more compounds having active hydrogen in the first polymerisation step - C08G 18/1825: {having hydroxy or primary amino groups} - C08G 18/1833: {having ether, acetal, or orthoester groups} - C08G 18/4018: {Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48} - C08G 18/4213: {from terephthalic acid and dialcohols} - C08G 18/4812: {Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups} - C08G 18/4829: {Polyethers containing at least three hydroxy groups (C08G18/4833 - C08G18/5096 take precedence)} - C08G 18/5003: {having halogens} - C08G 18/7664: {containing alkylene polyphenyl groups} - C08G 18/7671: {containing only one alkylene bisphenyl group} - C08J 9/0038: {containing phosphorus} - C08J 9/142: {Compounds containing oxygen but no halogen atom} - C08J 9/149: {Mixtures of blowing agents covered by more than one of the groups C08J9/141 - C08J9/143} - C08K 5/49: Phosphorus-containing compounds {(C08K5/0091 takes precedence)} - C08K 5/521: Esters of phosphoric acids, e.g. of H3PO4 - C08G 2110/0008: flexible - C08G 2350/00: Acoustic or vibration damping material - C08J 2201/022: premixing or pre-blending a part of the components of a foamable composition, e.g. premixing the polyol with the blowing agent, surfactant and catalyst and only adding the isocyanate at the time of foaming - C08J 2203/12: Organic compounds only containing carbon, hydrogen and oxygen atoms, e.g. ketone or alcohol - C08J 2203/14: Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons - C08J 2203/202: of physical blowing agents - C08J 2205/05: Open cells, i.e. more than 50% of the pores are open - C08J 2205/06: Flexible foams - C08J 2207/04: Aerosol, e.g. polyurethane foam spray - C08J 2375/06: from polyesters - C08J 2375/08: from polyethers - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract Two-component formulation for producing open-cell flexible foams having compressive strength of ≤1N/cm2, contained in 2-component aerosol can with crosslinker sleeve which can be opened prior to deploying formulation from aerosol can wherein the contents thereof enter aerosol can, wherein first component is present in aerosol can and second component that is reactive to first component is present separately in crosslinker sleeve and wherein aerosol can includes prepolymer composed of 25-35% by weight MDI and 40-55% by weight of polyol mixture having free isocyanate groups, and 10-21% by weight of propellant gas mixture and crosslinker sleeve includes 4-10% by weight of crosslinker mixture, wherein weight data are based on weight of formulation. Polyol mixture includes at least one trifunctional polyether and bifunctional polyester polyols, together with flame retardant, foam stabilizer, cell opener, amine catalyst, and crosslinker mixture including ethylene glycol in deficiency relative to free isocyanate groups and amine catalyst. ## Claims ### Claim 1 A two-component formulation for producing open-cell flexible foams having a compressive strength of ≤1N/cm2, contained in a 2-component aerosol can with a crosslinker sleeve which can be opened prior to deploying the formulation from the aerosol can such that the contents thereof enter the aerosol can, wherein a first component is present in the aerosol can and a second component that is reactive to the first component is present separately in the crosslinker sleeve and wherein the aerosol can comprises a prepolymer composed of 25 to 35% by weight MDI and 40 to 55% by weight of a polyol mixture having free isocyanate groups, and 10 to 21% by weight of a propellant gas mixture and the crosslinker sleeve comprises 4 to 10% by weight of a crosslinker mixture wherein the weight data are based on the weight of the formulation, wherein the polyol mixture comprises at least one trifunctional polyether polyol and at least one bifunctional polyester polyol, together with a flame retardant, a foam stabilizer, a cell opener and an amine catalyst, and the crosslinker mixture comprises ethylene glycol in deficiency relative to the free isocyanate groups of the prepolymer and an amine catalyst. ### Claim 2 (depends on 1) The formulation as claimed in claim 1, wherein the ethylene glycol in the crosslinker sleeve is sufficient to saturate 80 to 95% of the free isocyanate groups of the prepolymer. ### Claim 3 (depends on 2) The formulation as claimed in claim 2, wherein the ethylene glycol in the crosslinker sleeve is sufficient to saturate 85 to 90% of the free isocyanate groups of the prepolymer. ### Claim 4 (depends on 1) The formulation as claimed in claim 1, wherein the ratio by weight of polyols to the flame retardant in the polyol mixture is in the range from 85:15 to 60:40. ### Claim 5 (depends on 1) The formulation as claimed in claim 1, wherein the polyol mixture comprises flame retardant. ### Claim 6 (depends on 5) The formulation as claimed in claim 5, wherein the polyol mixture comprises ethylene glycol and flame retardant in a ratio by weight in the range from 35:65 to 60:40. ### Claim 7 (depends on 1) The formulation as claimed in claim 1, wherein the polyol mixture comprises a catalyst which is capable of catalyzing the reaction of isocyanate groups with water. ### Claim 8 (depends on 1) The formulation as claimed in claim 1, wherein the crosslinker mixture comprises two catalysts which are capable of catalyzing the reaction of isocyanate groups with ethylene glycol. ### Claim 9 (depends on 8) The formulation as claimed in claim 8, wherein the crosslinker mixture comprises bis(2-dimethylaminoethyl) ether and 2-(2-dimethylaminoethyl)ethanol as catalysts. ### Claim 10 (depends on 1) The formulation as claimed in claim 1, wherein the crosslinker mixture comprises a dye. ### Claim 11 (depends on 1) The formulation as claimed in claim 1, wherein the polyol mixture comprises a halogenated aliphatic polyol. ### Claim 12 (depends on 1) The formulation as claimed in claim 1, wherein the polyol mixture comprises propane, butane and dimethyl ether as propellant gas mixture. ### Claim 13 (depends on 12) The formulation as claimed in claim 12, wherein the propellant gas mixture comprises 40 to 70% by weight dimethyl ether, based on the propellant gas mixture. ### Claim 14 (depends on 1) The formulation as claimed in claim 1, wherein the MDI is crude MDI. ### Claim 15 (depends on 1) A method comprising applying the formulation of claim 1 for foam-filling cavities. ### Claim 16 (depends on 15) The method as claimed in claim 15 for sound insulation.