Jan Suetterlin,Marc-Stephan Weiser,Sascha Plug,Sebastian Dörr,Claudine Stoye
申请号：
US16245393
公开号：
US20190218329A1
申请日:
2019.01.11
申请国别(地区):
US
年份:
2019
代理人:
摘要：
The invention provides a process for producing polyurethane foams, the foams thus produced and the uses thereof. In the inventive process compositions comprisingA) isocyanate-functional prepolymers obtainable by the reaction of A1) aliphatic, low molecular weight diisocyanates of molar mass from 140 to 278 g/mol withA2) polyalkylene oxides having an OH functionality of two or more,A3) optionally further isocyanate-reactive components not covered by A2),B) water in an amount of at least 2% by weight, based on the total weight of the composition；C) optionally heterocyclic 4-membered or 6-membered ring oligomers of low molecular weight, aliphatic diisocyanates having a molar mass of 140 to 278 g/mol；D) optionally catalysts；E) optionally salts of weak acids, the corresponding free acids of which have a pKA in water at 25° C. of ≥；3.0 and ≤；14.0；F) optionally surfactants；G) optionally mono- or polyhydric alcohols or polyols, andH) optionally hydrophilic polyisocyanates obtainable by reaction of H1) low molecular weight, aliphatic diisocyanates of molar mass from 140 to 278 g/mol and/or polyisocyanates preparable therefrom and having an isocyanate functionality of 2 to 6 withH2) monofunctional polyalkylene oxides of OH number from 10 to 250 and of ethylene oxide content from 50 to 100 mol %, based on the total amount of the oxyalkylene groups present,are provided, foamed and cured, wherein the isocyanate-containing components, especially components A), C) and H), have a total isocyanate content within a range from 2% to 8% by weight and a content of urethane groups of 1.0 to 3.5 mol/kg, based in each case on the total amount of the isocyanate-containing components.
