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US 4,385,133 AGranted
Novel compositions and process
AssigneeThe Upjohn Company
InventorsLouis M. Alberino, Robert J. Lockwood
Life of this patent
Estimating the term…
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AssigneeThe Upjohn Company
InventorsLouis M. Alberino, Robert J. Lockwood
Estimating the term…
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 isocyanate) 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 3000 to 10,000 and contains at least 23 percent by weight of ethylene oxide residues and the other has a molecular weight in the range of about 750 to about 2000 and contains at least 45 percent 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.
In a process for the preparation of a polyurethane by reaction of an organic polyisocyanate, a polyol and low molecular weight aliphatic glycol extender the improvement which comprises employing as the polyol component a mixture which comprises;
In a process for the preparation of a polyurethane using a reaction injection molding technique in which an organic polyisocyanate, a polyol and a low molecular weight aliphatic glycol extender are brought together and reacted, the improvement which comprises employing as the polyol component a mixture which comprises:
In a process for the preparation of an elastomeric polyurethane utilizing two reaction Streams A and B which are brought together and reacted using a reaction injection molding technique said Stream A comprising an organic polyisocyanate and said Stream B comprising a blend of polyol and low molecular weight aliphatic glycol extender, the improvement comprising employing as Stream B a homogeneous blend of from 5 to 50 parts by weight, per 100 parts by weight of said blend, of aliphatic glycol extender the remainder of said blend comprising a mixture of a polyoxypropylene polyoxyethylene triol having a molecular weight in the range of about 3,000 to about 10,000 and containing at least 23 percent by weight of ethylene oxide residues and a polyoxypropylene polyoxyethylene diol having a molecular weight in the range of about 750 to about 2,000 and containing at least 45 percent by weight of ethylene oxide, said triol and said diol being present in such proportions that said aliphatic glycol extender is completely miscible therein.
Dependencies are inferred from the claim text.