Polyurethanes
OwnerWilliam R. Browninventor
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Abstract
Novel polyurethane-urea foams having superior tear and tensile strengths, elongation and load-bearing are prepared by reacting an alkylthio-substituted aromatic diamine in a mixture of polyols with an aromatic diisocyanate or aromatic diisocyanate prepolymer or mixtures thereof, having free NCO content of 0.1-50% by weight. These foams have good dynamic properties that make them attractive as cushioning materials.
Claims1
A flexible, low density polyurethane-foam composition having improved tear and tensile strengths, elongation and load-bearing comprising the reaction product of an aromatic diisocyanate or aromatic diisocyanate prepolymer with a mixture of:
- (a) 3,5-di(methylthio)-2,6-diaminotoluene, 3,5-di(methylthio)-2,4-diaminotoluene 1,3 methylthio-2,6-diaminotoluene and 1,3,5-triethylthio-2,6 diaminotoluene admixtures as the sole diamines, said alkylthio substituted aromatic diamines having a suitable reaction rate in the foaming process;
- (b) at least one polyol selected from a group consisting of polyalkene ether polyol, polymer polyol and mixtures thereof;
- (c) a blowing agent or mixtures of blowing agents;
- (d) a glycol amine cell stabilizer selected from the group consisting of monoethanol amine and diethanol amine,
- (e) an organosilicone stabilizer;
- and
- (f) a reaction promotor or mixtures thereof selected from a group of conventional organometallic, tertiary amine and tertiary amine salt catalysts.
Dependencies are inferred from the claim text.