Process for the preparation of polyurethanes with liquid crystal

Details Process for the preparation of polyurethanes with liquid crystal Process for the preparation of polyurethanes with liquid crystal

1988-09-07

1990-01-23

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 80, 528 85, C08G 1848

Patent

active

048959200

ABSTRACT:
This invention relates to a process for preparing polyurethanes having liquid crystal properties comprising reacting, in proportions corresponding to an NCO/OH equivalent ratio of from about 0.9:1 to 1.1:1, an organic polyhydroxyl compound with an organic diisocyanate having at least two phenylene groups and at least one carboxylic ester group. The organic diisocyanate comprises an aliphatic diisocyanate wherein at least one of the carboxylic ester groups connects an aliphatic group to a phenylene group or an aromatic diisocyanate wherein at least one of the carboxylic acid groups connects two phenylene groups.
This invention further relates to preferred diisocyanates used in the process according to this invention.

REFERENCES:
patent: 3719708 (1973-03-01), Thoma et al.
patent: 4417043 (1983-11-01), Cogswell et al.
patent: 4722989 (1988-02-01), Starner et al.
patent: 4762901 (1988-08-01), Dhein et al.
patent: 4791187 (1988-12-01), Siiling et al.
Jnl. of Amer. Chem. Society, vol. 12, #3, 5-6/1979, pp. 537-538.

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