METHOD FOR PRODUCING POLYURETHANE RIGID FOAMS AND POLYISOCYANURATE RIGID FOAMS.

摘要

The present invention relates to polyester polyols that are obtained or obtainable by means of esterification of from 10 to 70 mol-% of at least one compound selected from the group consisting of terephthalic acid (TPA), dimethyl terephthalate (DMT), polyethylene terephthalate (PET), phthalic acid anhydride (PSA), phthalic acid, and isophthalic acid, of from 0.1 to 30 mol-% of one or more fatty acids and/or fatty acid derivatives, of from 10 to 70 mol-% of one or more aliphatic or cycloaliphatic diols having 2 to 18 C atoms or alkoxylates thereof, of from 5 to 70 mol-% of a polyether polyol, produced by alkoxylation of an aromatic starter molecule having a functionality that is greater than or equal to 2, and of from 0 to 70 mol-% of a tri- or polyol differing from the polyether polyol, in each case relative to the total amount of components employed, with the sum of the amounts of the components employed being 100 mol-%. The present invention further relates to a method for producing polyurethane rigid foams or polyisocyanurate rigid foams comprising the reaction of an isocyanate component with a polyol component (PK) containing a polyester polyol according to the invention and other components, wherein the polyol component as such, as well as the polyurethane rigid foam or polyisocyanurate rigid foam are obtained or obtainable by the method according to the invention. The present invention also relates to the use of a polyester polyol (P1) according to the invention for generating polyurethane rigid foams or polyisocyanurate rigid foams.