Thermoplastic polyurethane elastomers from polyoxypropylene poly

Details Thermoplastic polyurethane elastomers from polyoxypropylene poly Thermoplastic polyurethane elastomers from polyoxypropylene poly

1981-02-26

1984-09-11

Jacobs, Lewis T.

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 77, 528 85, C08G 1848

Patent

active

RE0316717

ABSTRACT:
Polyurethane polyether-based elastomers are described which are thermoplastic, recyclable and have increased high temperature resistance which permits fabrication by injection molding. The elastomers are the product of reaction of 4,4'-methylenebis(phenyl isocyanate), a particular group of polypropylene oxide-polyethylene oxide block copolymers and an extender [straight chain aliphatic diols C.sub.2-6 or the bis(2-hydroxyethyl ether) of hydroquinone or resorcinol]. The block copolymers have at least 50 percent primary hydroxyl groups, a pH in the range of 4.5 to 9, a content of alkali metal ion less than 25 ppm and a molecular weight of 1000 to 3000. The minimum ethylene oxide (E.O.) residue content (percent by weight) of the polyether for any molecular weight (M.W.) is governed by the equation: ##EQU1## In a particularly preferred embodiment the elastomers are prepared by replacing up to 25 percent by equivalents of the extender by certain diols (polyethylene glycols up to 1500 M.W. preferred).

REFERENCES:
patent: 3336242 (1967-08-01), Hampson et al.
patent: 3380967 (1968-04-01), Lowe et al.
patent: 3420796 (1969-01-01), Matsubayashi et al.
patent: 4010146 (1977-03-01), Russell et al.
patent: 4101439 (1978-07-01), Russell et al.
Saunder et al., Polyurethanes, Part I, Interscience, NY, p. 4, (1962).
Saunders et al., Polyurethanes, Part II, Interscience, NY, p. 307.

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