# US 10,865,285 B2 · 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 10,865,285 B2 - Document ID: US10865285B2 - Status: Granted - Kind: B2 - Application number: 16/321,065 - Filed: 2017-07-28 - Published: 2019-06-06 - Granted: 2020-12-15 - Earliest claimed: 2016-07-28 - Assignees: Sika Technology AG - Applicants: Sika Technology AG - Inventors: Natalie Wagner - Web page: https://patentgrep.com/patent/US10865285B2 ## 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 system comprising a formulation for producing an open-cell flexible foam having a compressive strength of ≤1N/cm2, contained in an aerosol can and 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: the aerosol can comprises: a prepolymer having free isocyanate groups, the prepolymer being prepared from 25 to 35% by weight of diisocyanatodiphenylmethane (MDI) and 40 to 55% by weight of a polyol mixture relative to the total combined weight of all ingredients used to prepare the formulation; and 10 to 21% by weight of a propellant gas mixture relative to the total combined weight of all ingredients used to prepare the formulation; the crosslinker sleeve comprises 4 to 10% by weight of a crosslinker mixture relative to the total combined weight of all ingredients used to prepare the formulation; the polyol mixture comprises at least one trifunctional polyether polyol; at least one bifunctional polyester polyol; 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 at least one amine catalyst. ### Claim 2 (depends on 1) The system as claimed in claim 1, wherein the amount of ethylene glycol in the crosslinker mixture is sufficient to react with 80 to 95% of the free isocyanate groups of the prepolymer. ### Claim 3 (depends on 2) The system as claimed in claim 2, wherein the amount of ethylene glycol in the crosslinker mixture is sufficient to react with 85 to 90% of the free isocyanate groups of the prepolymer. ### Claim 4 (depends on 1) The system as claimed in claim 1, wherein a weight ratio of all polyols present in the polyol mixture to the flame retardant in the polyol mixture is in the range from 85:15 to 60:40. ### Claim 5 (depends on 1) The system as claimed in claim 1, wherein a weight ratio of the ethylene glycol to the flame retardant in the formulation is in the range from 35:65 to 60:40. ### Claim 6 (depends on 1) The system as claimed in claim 1, wherein the amine catalyst in the polyol mixture is capable of catalyzing a reaction of isocyanate groups with water. ### Claim 7 (depends on 1) The system as claimed in claim 1, wherein the at least one amine catalyst in the crosslinker mixture comprises two amine catalysts which are capable of catalyzing a reaction of isocyanate groups with ethylene glycol. ### Claim 8 (depends on 7) The system as claimed in claim 7, wherein the two amine catalysts are bis(2-dimethylaminoethyl) ether and 2-(2-dimethylaminoethyl)ethanol. ### Claim 9 (depends on 1) The system as claimed in claim 1, wherein the crosslinker mixture further comprises a dye. ### Claim 10 (depends on 1) The system as claimed in claim 1, wherein the polyol mixture further comprises a halogenated aliphatic polyol. ### Claim 11 (depends on 1) The system as claimed in claim 1, wherein the propellant gas mixture comprises propane, butane and dimethyl ether. ### Claim 12 (depends on 11) The system as claimed in claim 11, wherein the propellant gas mixture comprises 40 to 70% by weight of the dimethyl ether, based on the total weight of the propellant gas mixture. ### Claim 13 (depends on 1) The system as claimed in claim 1, wherein the MDI is crude MDI. ### Claim 14 (depends on 1) A method comprising utilizing the system of claim 1 for foam-filling cavities. ### Claim 15 (depends on 14) The method as claimed in claim 14, wherein said foam-filling provides sound insulation.