Hard, optically clear polyurethane articles

Details Hard, optically clear polyurethane articles Hard, optically clear polyurethane articles

1976-02-04

1978-07-18

Rzucidlo, Eugene C.

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 85, C08G 1828

Patent

active

041015290

ABSTRACT:
Polyurethane compositions characterized by being heat curable to yield hard, impact-resistant articles having a high heat distortion temperature are disclosed. The cured polyurethane articles are transparent and also hydrolytic and UV light stable as well as being abrasion resistant. The polyurethane is prepared from a cycloaliphatic polyisocyanate, low molecular weight active hydrogen-containing material and optionally a polycarbonate diol. The weight percentage of the urethane moieties and the crosslinked density are carefully controlled so as to provide the proper balance of physical properties, particularly between hardness, flexibility and heat distortion temperature. The polyurethane articles are particularly useful in glazing applications such as aircraft glazing.

REFERENCES:
patent: 3243414 (1966-03-01), DeWitt et al.
patent: 3356650 (1967-12-01), McElroy
patent: 3620905 (1971-11-01), Ahramjian
patent: 3755262 (1973-08-01), Slagel
patent: 3764457 (1973-10-01), Chang et al.
patent: 3791914 (1974-02-01), Ammons et al.
patent: 3965057 (1976-06-01), Ammons et al.
"Polyurethanes, Chemistry and Technology" Part I by Sounders et al., pp. 264-267, 1966, Interscience Publ. N.Y.

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