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Process for preparing formed articles made of polyurethane foams and formed articles so obtained

  • US 5,530,033 A
  • Filed: 05/15/1995
  • Issued: 06/25/1996
  • Est. Priority Date: 09/26/1990
  • Status: Expired due to Term
First Claim
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1. A process for preparing a polyurethane foam, comprising:

  • predissolving at least one part by weight of a hydrofluoroalkane and/or perfluoroalkane having one or two carbon atoms in 100 parts by weight of a polyether polyol and an amine having the formula (I);

    ##STR3## where;

    X represents a hydrogen atom or one of the groups Z1 --R2 -- or Z2 --R1 ;

    Z1 and Z2 independently represent a hydrogen atom or an OH, NH2 or NHR3 group, where R3 represents an alkyl, a cycloalkyl, an aryl or an alkylaryl radical having 1 to 12 carbon atoms; and

    R1 and R2 independently represent an alkylene, a cycloalkylene, an arylene or an alkylarylene radical having 1 to 20 carbon atoms or a polyoxyalkylene chain having an average molecular weight of from 60 to 8,000 in which the alkylene group of the polyoxyalkylene chain has 1 to 4 carbon atoms,in a closed vessel by stirring sufficiently to provide a homogeneous mixture, said homogeneous mixture consisting essentially of (i) said hydrofluoroalkane and/or perfluoroalkane, (ii) said polyether polyol and (iii) said amine in an amount providing at least 0.03 mol of aminic groups per 100 grams of said polyether polyol, andreacting said homogeneous mixture with a polyisocyanate.

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