Water dispersible polyurethane and process for preparation there

Details Water dispersible polyurethane and process for preparation there Water dispersible polyurethane and process for preparation there

1992-09-03

1994-04-26

Michl, Paul R.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

525 28, 525 31, 525452, 525455, 525459, 525460, 525920, 528 73, 528 75, C08J 300, C08K 320, C08L 7500, C08G 1800

Patent

active

053067649

ABSTRACT:
Amine-containing, water dispersible polyurethanes made by the following process: (1) in a reactive diluent such as acrylate, methacrylate, acrylonitrile monomer, low viscosity epoxy compound or epoxy resin, or mixture thereof, using an excess amount of polyisocyanate to react with polyol to form NCO-terminated urethane prepolymer; (2) adding hydroxy alkyl acrylate or hydroxy alkyl methacrylate monomer to react with the prepolymer in step (1) to convert its -NCO end group into alkyl acrylate or alkyl methacrylate end group; and (3) using an excess amount of polyamine to react with the alkyl (meth)acrylate-terminated prepolymer in step (2) and the reactive diluent and the residual hydroxy-containing monomer in step (2), if any. The polyurethane can be mixed with a crosslinking agent having multi-epoxy or blocked polyisocyanate functionalities, to prepare a stable aqueous coating composition.

REFERENCES:
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patent: 4046729 (1977-09-01), Scriven et al.
patent: 4066591 (1978-01-01), Scriven et al.
patent: 4147679 (1979-04-01), Scriven et al.
patent: 4203883 (1980-05-01), Hangauer, Jr.
patent: 4335029 (1982-06-01), Dabi et al.
patent: 4948829 (1990-08-01), Mitsuji et al.
patent: 5087643 (1992-02-01), Truong

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