Process for the preparation of low temperature flexible polyurethane elastomers
AssigneeBASF SE
InventorsDietmar Nissen, Hans U. Schmidt, Wolfgang Straehle, Uwe Schuett, Matthias Marx
Life of this patent
Estimating the term…
Abstract
Low temperature flexible polyurethane elastomers are prepared by reacting organic polyisocyanates with polyester polyols which have glass transition temperatures of -10.degree. to -80.degree. C. and incorporating therein alkoxylated esters of fatty acids and/or alkoxylated terpene alcohols.
Claims18
A process for the preparation of low temperature flexible polyurethane elastomers by reacting organic polyisocyanates, polyols, alkoxylated fatty acid esters and/or alkoxylated terpene alcohols in the presence of catalysts and optionally chain extenders, blowing agents, stabilizers, pigments, surface active agents and flame retardants wherein said polyols are selected from the group consisting of polyester polyols having a hydroxyl number of 40 to 120 and a glass transition temperature range of -10.degree. C. to -80.degree. C. and polytetrafuran polyols having a hydroxyl number of 20 to 250.
A process for the preparation of low temperature flexible elastomers wherein
- (a) polyester polyol prepolymers with NCO contents of 10 to 20 percent by weight based on the weight of polyisocyanate,
- (b) polyesterdiols having OH numbers of 40 to 120 and glass transition temperatures of -10.degree. C. to -80.degree. C.,
- (c) alkoxylated fatty acid esters produced by alkoxylation of fatty acid esters having 8 to 26 carbon atoms in the fatty acid radical with ethylene and/or propylene oxide in a mole ratio of 1:1 to 1:30 and
- (d) optionally chain extenders or cross-linking agents
- are reacted in the presence of catalysts, blowing agents and additives in quantities of 0.1 to 6 parts by weight of component (c) per 100 parts by weight of component (b) and optionally (d), wherein the mole ratios of reactive hydrogen atoms of the components (b), (c) and optionally (d) to the NCO groups of components (a) range from 0.90:1 to 1.15:1.
Dependencies are inferred from the claim text.