Liquid reactive compositions comprising polyisocyanates, epoxides and solutions of alkali metal halides in polyoxyalkylenic compounds
AssigneeEnichem S.p.A.
InventorsFabrizio Parodi, Carla Zannoni
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Abstract
Reactive compositions liquid at a temperature lower than 70.degree. C., comprising: A) at least one organic polyisocyanate; B) a mono- or poly-epoxide, or a mixture of different mono- and/or poly-epoxides: C) a catalyst, liquid at a temperature lower than 70.degree. C., consisting of a solution of at least one alkali metal halide in a polyoxyalkylenic compound or in a mixture of different polyoxyalkylenic compounds, said polyoxyalkylenic compound containing at least one hydroxyl group of alcoholic type. These reactive compositions are able to gel and solidify rapidly at temperatures between 0.degree. and 70.degree. C., to form a glassy polymer of high softening point.
Claims23
A reactive composition liquid at a temperature lower than 70.degree. C., comprising:
- A) at least one organic polyisocyanate;
- B) a mono- or polyepoxide, or a mixture of different mono- and/or polyepoxides, the ratio of isocyanate groups to epoxy groups in components A and B ranging from 99:1 to 50:50;
- C) a catalyst, liquid at a temperature of less than 70.degree. C., consisting of a solution of at least one alkali metal halide in a polyoxyalkylenic compound or in a mixture of different polyoxyalkylenic compounds, said polyoxyalkylenic compound containing at least one alcohol hydroxyl group wherein the weight ratio of alkali metal compound to polyoxyalkylenic compound ranges from 1:2 to 1:20 and wherein the weight ratio of the alkali metal halide to the mixture of A and B components ranges from 0.01:100 to 5:100.
A reactive composition liquid at a temperature lower than 70.degree. C., comprising:
- A) MDI polyisocyanate;
- B) an epoxy resin mixture consisting essentially of the diglycidylether of bisphenol F the ratio of isocyanate groups to epoxy groups in components A and B ranging from 99:1 to 50:1;
- and
- C) a catalyst of potassium iodide in polyoxyethylene glycol having an average molecular weight of about 400wherein the weight ratio of potassium iodide to polyoxyethylene glycol ranges from 1:2 to 1:20 and wherein the weight ratio of the potassium iodide to the mixture of A and B components ranges from 0.01:100 to 5:100.
Dependencies are inferred from the claim text.