Castable thermosetting polyurethane polymer having improved heat

Details Castable thermosetting polyurethane polymer having improved heat Castable thermosetting polyurethane polymer having improved heat

1991-06-04

1992-07-14

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 53, 528 54, 528 55, 528 76, 528 77, C08G 1832

Patent

active

051304040

ABSTRACT:
A castable thermosetting polyurethane polymer, having improved heat-stability characteristics, comprising (A) a polymeric methylene diisocyanate, (B) a propyleneoxide-extended polyol which is preferably a sugar-based polyol, (C) a polyether diol or triol, and (D) dipropylene glycol or diethylene glycol, in amounts respectively between about 35-45 parts by weight, 35-45 parts by weight, and 12-20 parts by weight, per 100 parts by weight of total diol and triol (resin) components, providing an NCO/OH ratio between about 1:1 and about 1.2:1, an effective polyurethane-catalyzing amount of (E) a urethane catalyst, and optionally comprising an effective amount of a drying agent, is disclosed. The cast polyurethane polymer of the invention withstands temperatures of 450.degree. F. (232.degree. C.) for 20 minutes without visual polymer degradation, whereas most other castable polyurethane systems degrade between 350.degree. F. and 375.degree. F., as a result of which heat-stability the polymer of the present invention is especially suitable for post finishing which involves the employment of higher temperatures, such as painting with thermosetting coatings, powder coating, and anodizing.

REFERENCES:
patent: 4010146 (1977-03-01), Russell et al.

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