Urethane elastomers prepared using a prepolymer prepared from a

Details Urethane elastomers prepared using a prepolymer prepared from a Urethane elastomers prepared using a prepolymer prepared from a

1985-02-21

1986-07-22

Welsh, Maurice 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...

528 65, 528 66, 528 745, C08G 1810

Patent

active

046020799

ABSTRACT:
The hydrolysis resistance of a urethane elastomer prepared by reacting a hydroxy compound with a prepolymer in a weight ratio of between 5/95 and 95/5 is improved; the hydroxy compound consists of at least one saturated polyester resin and/or at least one chain-extending agent, if necessary in the presence of the usual additives, each resin and each chain-extending agent having at least two OH end groups; the prepolymer is prepared by reacting at least one saturated polyester resin having at least two OH end groups and at least one organic isocyanate of functionality .gtoreq.2, in molar excess. To this end, to prepare at least one polyester resin, a fraction of the polyacid(s) used is replaced by at least one polymerized fatty acid, consisting substantially of a dimer and/or a trimer, the initial total content of polymerized fatty acid(s) being between 1 and 35% by weight, referred to the finished product. The value of the load at break of the elastomer is retained to an extent of at least 50% or has a value at least equal to 5 MPa after hydrolysis.

REFERENCES:
patent: 3068254 (1962-12-01), LeBras et al.
patent: 3106537 (1963-10-01), Simon et al.
patent: 3264236 (1966-08-01), Santaniello
patent: 3349049 (1967-10-01), Seiwert et al.
patent: 3383343 (1968-05-01), Mohajer et al.
patent: 3406134 (1968-10-01), Seiwert et al.
patent: 3498940 (1970-03-01), Laganis
patent: 4195000 (1980-03-01), Charles et al.

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