Urethane-free, diphenylmethane diisocyanate prepolymers and proc

Details Urethane-free, diphenylmethane diisocyanate prepolymers and proc Urethane-free, diphenylmethane diisocyanate prepolymers and proc

1995-06-06

1996-10-22

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

2521822, 25218222, 560 27, 528 56, 528 64, C08G 1871

Patent

active

055677932

ABSTRACT:
Allophanate-modified MDI which is a storage stable liquid at 25.degree. C. is produced in two steps. First, a monoisocyanate is reacted with an organic material having about 1.8 or more hydroxyl groups and a molecular weight of from about 60 to about 6,000 to form the urethane. The urethane is then reacted with an isomeric mixture of MDI in an amount such that the resultant isocyanate will have an NCO content of from about 3 to about 28%. The isomeric mixture of diphenylmethane diisocyanate contains from about 0 to about 60% by weight 2,4'-diphenylmethane diisocyanate, less than 6% by weight 2,2'-MDI and the remainder 4,4'-MDI. The prepolymers of this invention are particularly useful in reaction injection molding processes because molded articles having improved flex modulus are obtained.

REFERENCES:
patent: 3644457 (1972-02-01), K onig et al.
patent: 3839293 (1974-10-01), Knopf et al.
patent: 4055548 (1977-10-01), Carleton et al.
patent: 4115429 (1978-09-01), Reiff et al.
patent: 4118411 (1978-10-01), Reiff et al.
patent: 4160080 (1979-07-01), K onig et al.
patent: 4261852 (1981-04-01), Carroll et al.
patent: 4490300 (1984-12-01), Allen et al.
patent: 4738991 (1988-04-01), Narayan
patent: 4866103 (1989-09-01), Cassidy et al.
patent: 5319053 (1994-06-01), Slack et al.
patent: 5319054 (1994-06-01), Slack et al.

Affiliated with

Also associated with

Rating

Urethane-free, diphenylmethane diisocyanate prepolymers and proc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Urethane-free, diphenylmethane diisocyanate prepolymers and proc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Urethane-free, diphenylmethane diisocyanate prepolymers and proc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2359411