Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1979-12-14
1981-09-08
Cockeram, H. S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
252182, 521167, 525457, 528 61, 528 65, 528 85, 560 26, C08G 1832, C08G 1876, C07C12507, C07C125077
Patent
active
042885779
ABSTRACT:
Reaction of a large excess of 1,4-butanediol with methylenebis (4-phenyl isocyanate) gives a mixture of urethanediols which is a suitable curing agent for isocyanate-terminated polyurethane prepolymers, especially prepolymers made from methylenebis (4-phenyl isocyanate) and polyols. It is desirable to have a urethanediol mixture in which at least about 88 weight percent consists of the reaction product of 2 moles of 1,4-butanediol with 1 mole of the diisocyanate, about 10 weight percent of the reaction product of 3 moles of 1,4-butanediol with 2 moles of the diisocyanate, and no more than about 2 weight percent of 1,4-butanediol. The novel cured polyurethanes have higher hardness and better overall physical properties than methylenebis-(4-phenyl isocyanate)-based polyurethanes cured with conventional commercial diols providing "hard" cured products.
REFERENCES:
patent: 2703810 (1955-03-01), Viard
patent: 2802022 (1957-08-01), Groszos et al.
patent: 4120834 (1978-10-01), Fatutto
Cockeram H. S.
E. I. Du Pont de Nemours and Company
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