Abstract:
A polyol component P) contains at least three different polyether polyols A) to C), and at least one polyether ester polyol D). A process for producing rigid polyurethane foams using the polyol component P) and the rigid polyurethane foams produced therefrom can be utilized.
Abstract:
A polyol component b) comprising: 20 to 40 wt % of polyetherester polyols B) having a functionality of 3.8 to 4.8, an OH number of 380 to 440 mg KOH/g and a fatty acid and/or fatty acid ester content of 8 to 17 wt %, based on the weight of polyetherester polyols B); 20 to 40 wt % of polyether polyols C) having a functionality of 3.7 to 4 and an OH number of 300 to 420 mg KOH/g; 20 to 40 wt % of one or more polyether polyols D) having a functionality of 4.5 to 6.5 and an OH number of 400 to 520 mg KOH/g; 0.5 to 5.5 wt % of catalysts E), 0.1 to 5 wt % of further auxiliaries and/or added-substance materials F), 0.5 to 5 wt % of water G); and also rigid polyurethane foams obtained therewith and use thereof for insulation and refrigeration applications.
Abstract:
This invention relates to a polyol component P), to a process for preparing rigid polyurethane foams by using said polyol component P) and also to the rigid polyurethane foams themselves.
Abstract:
The present invention relates to a method of producing polyurethane or polyisocyanurate foams which comprises the step of reacting a composition (Z1), comprising a composition (ZP) at least comprising a polyol and a catalyst that catalyzes the formation of a urethane, urea or isocyanurate bond, and a surfactant TD having an HLB value below 10 and no silicon atom, wherein the sum total of surfactants TD in the composition comprises from 0.05 to 10 parts by mass per 100 parts by mass of the composition (ZP), with at least one polyisocyanate, wherein the step of reacting takes place in the presence of a nucleating agent selected from the group consisting of perfluorinated hydrocarbons, ethers having at least one perfluorinated hydrocarbyl moiety and ketones having at least one perfluorinated hydrocarbyl moiety, and of a blowing agent, wherein the nucleating agent differs from the blowing agent, and wherein the nucleating agent and the blowing agent are mixed to obtain a composition (Z2) and said composition (Z2) is added to said composition (Z1) before the step of reacting with the at least one polyisocyanate. The present invention further relates to a stabilized composition (ZS) and also to a kit for preparing a stabilized composition (ZS) for producing a polyurethane or polyisocyanurate foam, and to methods of producing polyurethane or polyisocyanurate foams by reacting a stabilized composition of the present invention and/or a stabilized composition obtained or obtainable according to a method of the invention.