Process for the preparation of rigid polyurethane foam
AssigneesAir Products and Chemicals, Inc., Nippon Nyukazai Co., Ltd.
InventorsShinichi Asako, Hajime Uchida
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Abstract
In a process for the preparation of rigid polyurethane foam from a polyol and a polyisocyanate, it is possible to prepare rigid polyurethane foam by using an aqueous polymer emulsion comprising a polymer of ethylenically unsaturated monomers whereby the amount of chlorofluorocarbon used can be decreased or eliminated.
Claims18
In a process for the preparation of rigid polyurethane foam by reacting an organic polyisocyanate with a polyol in the presence of a urethane catalyst, a blowing agent and a silicone surfactant cell stabilizer, the improvement which comprises using as a blowing agent an aqueous polymer emulsion comprising a polymer of ethylenically unsaturated monomers selected from the group consisting of styrene, methyl methacrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate or methacrylate, mono-acrylate or -methacrylate of polyethylene glycol, acrylic acid, methacrylic acid, and mixtures thereof, the aqueous polymer emulsion being used at 0.5 to 20 parts polymer/100 parts polyol.
In a process for the preparation of rigid polyurethane foam by reacting an organic polyisocyanate with a polyol in the presence of, a urethane catalyst, a blowing agent and a silicone surfactant cell stabilizer, the improvement which comprises using as a blowing agent an aqueous polymer emulsion comprising 20 to 70 wt % polymer of ethylenically unsaturated monomers selected from the group consisting of styrene, methyl methacrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate or methacrylate, mono-acrylate or -methacrylate of polyethylene glycol, acrylic acid, methacrylic acid, and mixtures thereof, the aqueous polymer emulsion being used at 1 to 15 parts polymer/100 parts polyol.
Dependencies are inferred from the claim text.