Process for preparing formed articles made of polyurethane foams and formed articles so obtained
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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Abstract
A process for preparing formed articles made of polyurethane foams, which comprises reacting at least a polyisocyanate with at least a compound containing end activated hydrogens in the presence of an expanding medium, selected from at least a hydrofluoroalkane and/or perfluoroalkane, and of a product, containing at least a structural unit of the aminic type, chemically bound or present in free form in one of the two polyurethane reagents, said expanding medium being dissolved in said one of the two polyurethane reagents.
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Citations
15 Claims
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1. A process for preparing a polyurethane foam, comprising:
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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, and reacting said homogeneous mixture with a polyisocyanate. - View Dependent Claims (3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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2. A process for preparing a polyurethane foam, comprising:
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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 polyisocyanate and an amine having the formula (I);
##STR4## 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 polyisocyanate and (iii) said amine in an amount providing at least 0.03 mol of aminic groups per 100 grams of said polyisocyanate, and reacting said homogeneous mixture with a polyether polyol. - View Dependent Claims (4)
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Specification