Construction material which can be shaped under the influence of

Details Construction material which can be shaped under the influence of Construction material which can be shaped under the influence of

1984-07-27

1985-10-15

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 66, 528 67, 528 76, 528 77, C08G 1848

Patent

active

045475610

ABSTRACT:
A polyurethane material is disclosed which is hard and has high impact strength at temperatures less than about 45.degree. C. yet can be softened at temperatures above about 60.degree. C. to be manually shapable. This material is obtained by reacting an araliphatic or cycloaliphatic diisocyanate with a polyol component which contains at least 50 wt % of a polyether obtained predominantly from propylene oxide. The polyol component has a number average molecular weight between about 350 and 1000 and an OH number between about 250 and 600. The reaction is conducted at an NCO to OH ratio of between about 0.75:1 and 1.25:1. This material finds utility in the medical field, particularly in forming orthopedic devices, in model construction, as a protective coating, as an impression material, as a decorative material or as a glazing material.

REFERENCES:
patent: 3755262 (1973-08-01), Slagel

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