Premixes for the preparation of polyurethane or polyisocyanurate foams
AssigneeSolvay (Societe Anonyme)
InventorsPierre Barthelemy, Annie Leroy
Life of this patent
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Abstract
Premixes intended for the preparation of polyurethane or polyisocyanurate foams comprising at least one polyol, at least one hydrofluoroalkane corresponding to the general formula CF.sub.3 --CR.sup.1 R.sup.2 --CF.sub.2 --R.sup.3, where R.sup.1 and R.sup.2 represent, independently, a hydrogen atom or an optionally fluorinated C.sub.1 -C.sub.3 alkyl group and where R.sup.3 represents a hydrogen atom or a methyl group, and at least one stabilizer chosen from nitroalkanes, diketones, alkaline-earth metal salts and brominated compounds.
Claims7
A premix for the preparation of polyurethane or polyisocyanurate foams comprising at least one polyol, at least one hydrofluoroalkane blowing agent corresponding to the formula CF.sub.3 --CR.sup.1 R.sup.2 --CF.sub.2 --R.sup.3, where R.sup.1 and R.sup.2 represent, independently of one another, a hydrogen atom or an optionally fluorinated C.sub.1 -C.sub.3 alkyl group and where R.sup.3 represents a hydrogen atom or a methyl group, and at least one stabilizer selected from the group consisting of C.sub.1 to C.sub.6 nitro alkanes.
A process for the manufacture of polyurethane or polyisocyanurate foams, in which at least one isocyanate is reacted with at least one polyol in the presence, firstly, of at least one hydrofluoroalkane corresponding to the formula
- CF.sub.3 --CR.sup.1 R.sup.2 --CF.sub.2 --R.sup.3
- where R.sup.1 and R.sup.2 represent, independently of one another, a hydrogen atom or an optionally fluorinated C.sub.1 -C.sub.3 alkyl group and where R.sup.3 represents a hydrogen atom or a methyl group, and, secondly, of at least one stabilizer selected from the group consisting of C.sub.1 to C.sub.6 nitroalkanes.
Dependencies are inferred from the claim text.