초록 ▼

The present invention relates to hard polyurethane foams. These foams are produced by the reaction of 1) polyisocyanates, with 2) compounds having molecular weights of from 92 to 10,000 and having at least two hydrogen atoms which are reactive with isocyanate groups, in the presence of 3) hydrofluor

The present invention relates to hard polyurethane foams. These foams are produced by the reaction of 1) polyisocyanates, with 2) compounds having molecular weights of from 92 to 10,000 and having at least two hydrogen atoms which are reactive with isocyanate groups, in the presence of 3) hydrofluoroalkanes as foaming agents, and 4) solubilizers. Suitable solubilizers comprise one or more of R1OCOOR2; a) R2OCOOCOOR2; or [Figure] wherein R1 and R2 signify C1-C12-alkyl or together C2-C6-alkylene and n signifies an integer from 0 to 6; [Figure] b) wherein R1 to R3 signify C1-C12-alkyl which is optionally substituted by halogens, C5-C10-cycloalkyl or optionally substituted aryl; [Figure] c) wherein R1 and R2 signify C1-C16-alkyl or C5-C10-cycloalkyl; and/or [Figure] d) wherein R signifies C1-C20 alkyl or C5-C10 cycloalkyl.

대표청구항 ▼

Process for producing rigid polyurethane foams by the reaction of 1) polyisocyanates with 2) compounds of a molecular weight of from 92 to 10,000 having at least two hydrogen atoms active towards isocyanates in the presence of 3) hydrofluoroalkanes as foaming agents and of 4) solubilisers as well as

Process for producing rigid polyurethane foams by the reaction of 1) polyisocyanates with 2) compounds of a molecular weight of from 92 to 10,000 having at least two hydrogen atoms active towards isocyanates in the presence of 3) hydrofluoroalkanes as foaming agents and of 4) solubilisers as well as optionally in the presence of 5) other auxiliary substances and additives known per se, characterised in that at least one of the following compounds are used as solubilisers (4) R1OCOOR2; R1OCOOCOOR2; [Figure] wherein R1 and R2 signify C1-C12-alkyl or together C2-C6-alkylene and n signifies an integer from 0 to 6, [Figure] wherein R1 to R3 signify C1-C12-alkyl which is optionally substituted by halogens, C5-C10-cycloalkyl or optionally substituted aryl, [Figure] wherein R1 and R2 signify C1-C16-alkyl or C5-C10-cycloalkyl, [Figure] wherein R signifies C1-C20 alkyl or C5-C10 cycloalkyl.