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US 4,904,707 AGranted
Novel polyol composition and the use thereof in the preparation of rigid polyurethane foams
AssigneeMobay Corporation
InventorSoheila R. Lunney
Life of this patent
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Abstract
The present invention is directed to a novel polyol composition and the use thereof in the preparation of a rigid polyurethane foam. More particularly the polyol composition is a blend of specific amounts of two polyols, one based on ortho-toluene diamine and the other based on a non-ortho-toluene diamine.
Claims4
A process for producing a polyurethane foam comprising:
- reacting an organic di- and/or polyisocyanate with a polyol in the presence of a blowing agent, said polyol comprising:
- (a) an adduct obtained by sequentially reacting 2,4- and/or 2,6-toluene diamine with from 3 to 5 moles of ethylene oxide and then with from 1 to 5.1 moles of propylene oxide, the total number of moles of ethylene oxide plus propylene oxide being at least 5 and no more than 8.1, and
- (b) an adduct obtained by sequentially reacting 2,3- and/or 3,4-toluene diamine with from 1 to 5 moles of ethylene oxide and then with from 1 to 6 moles of propylene oxide, the total number of moles of ethylene oxide plus propylene oxide being at least 5 and no more than 9, the weight ratio of component (a) to component (b) being from 35:65 to 70:30.
Dependencies are inferred from the claim text.