Solvay Fluor Und Derivate Gmbh

Solvay Sa

Werner Kruecke

Lothar Zipfel

Dierk-Ingolf Recke

Karsten Boerner

A method for the production of polyurethane foams and of thermoplastic foams is described. As blowing agent, a composition is used, which contains or consists of pentafluorobutane, preferably pentafluorobutane (HFC-365mfc) and at least one further blowing agent selected from the group comprising; difluoromethane (HFC-32); difluoroethane, preferably 1,1-difluoroethane (HFC-152a); 1,1,2,2-tetrafluoroethane (HFC-134); 1,1,1,2-tetrafluoroethane (HFC-134a); hexafluoropropane, preferably 1,1,1,3,3,3-hexafluoropropane (HFC-236fa); 1,1,2,3,3,3-hexafluoropropane (HFC-236ea) and heptafluoropropane, preferably 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), low-boiling, optionally halogenated hydrocarbons and/or low-boiling, optionally halogenated ethers.

Production of polyurethane foams and of foamed thermoplastic synthetic resins

A blowing agent composition includes a blowing agent consisting of liquified carbon dioxide and 1,1-difluoroethane, or a mixture consisting of liquid carbon dioxide and at least one other liquid or pressure-liquified component selected from the group consisting of ethers with a total of 2 to 4 carbon atoms; ketones with 3 to 5 carbon atoms; alcohols with 1 to 5 carbon atoms; aliphatic hydrocarbons selected from the group consisting of propane, butane, pentane, hexane, heptane; cyclic hydrocarbons with 3 to 12 carbon atoms; fluorohydrocarbons selected from the group consisting of trifluoromethane, 1,1,1-trifluoroethane, 1,1,2-trifluoroethane, 1,1,2,2-tetrafluoroethane, 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane and 1,1,1,3,3-pentafluorobutane; phosphate esters and phosphonate esters containing three C1-C4-alkyl groups optionally substituted by one or more halogen atoms. The composition comprises 5 to 50% by weight of liquid carbon dioxide.

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Hannover, Germany

Werner Kruecke