Process for the preparation of polyurethanes having a...

Details Process for the preparation of polyurethanes having a... Process for the preparation of polyurethanes having a...

C - Chemistry, Metallurgy

08

G

402/145

C08G 18/66 (2006.01) C08G 18/48 (2006.01)

Patent

CA 1175994

4004 ABSTRACT OF THE DISCLOSURE Polyurethanes having a two phase morphology and characterized by high impact strength and, optionally, high modulus are obtained by reaction of 4,4'-methylenebis(phenyl isocyante) and modified forms thereof with an aliphatic glycol extender and a blend of at least two polyoxypropylene-polyoxyethylene polyols, both of which have average functionalities in the range of 2 to 4, one of which has a molecular weight in the range of about 3,000 to 10,000 and contains at least 23% by weight of ethylene oxide residues and the other has a molecular weight in the range of about 750 to about 2,000 and contains at least 45% by weight of ethylene oxide. The two or more such polyols are employed in proportions such that the aliphatic glycol extender is completely miscible with said polyols if blended together.

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