Polyhydroxyalkane/aromatic diamine chain extenders

Details Polyhydroxyalkane/aromatic diamine chain extenders Polyhydroxyalkane/aromatic diamine chain extenders

1988-02-22

1988-11-22

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521163, 528 64, 528 85, 25218217, 25218226, C08G 1832

Patent

active

047866560

ABSTRACT:
Blends of 90-99 mol % of a polyhydroxyalkane containing 2-6 carbons and 2-3 hydroxyl groups and 1-10 mol % of an aromatic diamine having a pKb value greater than 11.3 are useful as chain extenders for polyurethanes derived from diphenylmethanediisocyanate (MDI) prepolymers. Their use overcomes the sensitivity to stoichiometry common to MDI prepolymer/polyhydroxyalkane systems and leads to the formation of cast elastomers having better green strength and a shorter demold time. The preferred blends are blends of 1,4-butanediol and di(alkylthio)toluenediamines.

REFERENCES:
patent: 4146688 (1979-03-01), Schwindt et al.
patent: 4296212 (1981-10-01), Ewen et al.
patent: 4523004 (1985-06-01), Lin et al.
patent: 4530941 (1985-07-01), Turner et al.
patent: 4595742 (1986-06-01), Nalepa et al.
patent: 4659747 (1987-04-01), Alberino et al.

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