Moisture resistant polyurethanes derived from non-aromatic diiso

Details Moisture resistant polyurethanes derived from non-aromatic diiso Moisture resistant polyurethanes derived from non-aromatic diiso

1988-01-04

1990-01-02

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 61, 528 65, 528 76, 528 77, 528 81, 528 83, C08G 1838

Patent

active

RE0331414

ABSTRACT:
The reduction in tensile strength exhibited in high humidity environments by "soft" polyurethanes prepared from aliphatic or cycloaliphatic diisocyanates can be substantially reduced if the molar ratio of diisocyanate and chain extender to isocyanate-reactive species other than said chain extender in the reaction mixtures from which said polyurethanes are prepared is at least 4.

REFERENCES:
patent: 3886226 (1975-05-01), Asai et al.
patent: 3923747 (1975-12-01), Kolycheck
patent: 4098742 (1978-07-01), Mueller
patent: 4447590 (1984-05-01), Szycher
patent: 4523005 (1985-06-01), Szycher
Article, "Structure-Property Relationships of Transparent Aliphatic Polyurethane Elastomers from the Geometric Isomers of Methylene BIS(4-Cyclohexyl Isocyanate)", Shaio-wen Wong et al., Advances in Urethane Science & Technology, Technomic, vol. 9, 1984.

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