Polymeric foams
AssigneeImperial Chemical Industries PLC
InventorsHerbert Russell Gillis, Dirk Stanssens, Rik De Vos, Aaldrik Roelf Postema, David Randall
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Abstract
A method for the preparation of rigid foams by reacting an organic polyisocyanate with an isocyanate-reactive material in the presence of a blowing promoter characterized in that the isocyanate-reactive material comprises at least one isocyanate-reactive cyclic carbonate or isocyanate-reactive cyclic urea, the reaction being performed in the presence of an inert insoluble organic liquid which is present as the disperse phase of an emulsion or a microemulsion, and in the presence of a metal salt catalyst.
Claims8
A method for the preparation of rigid foams by reacting an organic polyisocyanate with an isocyanate-reactive material, characterized in that the isocyanate-reactive material comprises at least one isocyanate-reactive cyclic blowing promoter of the formula:
- ##STR6## wherein Y is --O-- or --NR.sup.1 --;
- wherein each R.sup.1, independently is a lower alkyl radical of C.sub.1 -C.sub.6, or a lower alkyl radical substituted with an isocyanate-reactive group;
- wherein each R, independently is H, a lower alkyl radical of C.sub.1 -C.sub.6, or --(CH.sub.2).sub.m -- X wherein X is an isocyanate-reactive group which is OH or NH.sub.2, and m is 0, 1 or 2;
- and wherein n is 1 or 2 with the proviso that at least one of R.sup.1 or R is or comprises an isocyanate-reactive group, the reaction being performed in the presence of an inert insoluble organic liquid which is present as the dispersed phase of an emulsion or a microemulsion and in the presence of a metal salt catalyst, wherein said inert insoluble organic liquid is selected from the group consisting of fluorinated compounds, aliphatic hydrocarbons, cycloalipahtic hydrocarbons and aromatic hydrocarbons.
Dependencies are inferred from the claim text.