Curatives for aqueous adhesives

Details Curatives for aqueous adhesives Curatives for aqueous adhesives

1993-08-20

1995-08-15

Michl, Paul R.

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...

524590, 528 76, C08G 1800, C08G 1830, C08J 300, C08L 320

Patent

active

054420288

ABSTRACT:
1. An isocyanate curative used for curing water-borne polyurethane adhesive compositions and providing enhanced water-resistance to the cured adhesive is the reaction product of A) between about 30 and about 60 wt. % one or more polyethers formed from alkyl oxides, between about 5 and about 40 mole percent of the total polyether content comprising propylene oxide units and between about 60 and about 95 mole percent of the total polyether content comprising polyethylene oxide units, B) between about 1 and about 10 wt % of an aliphatic diol(s), C) between about 10 and about 10 wt % of an aliphatic triol(s) or polyols having hydroxyl functionality greater than 3, and D) between about 30 and about 50 wt % of an aliphatic diisocyanate, the aliphatic diisocyanate being provided in an amount to provide an NCO/OH ratio of between about 1.5 and about 2, the curative having an NCO content of between about 5 and about 10 wt. % and an NCO equivalent weight of between about 400 and about 1200.

REFERENCES:
patent: 4663377 (1987-05-01), Hombach et al.
patent: 4745151 (1985-05-01), Noll et al.

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