Method for producing self- emulsifiable aqueous polyurethane...

Details Method for producing self- emulsifiable aqueous polyurethane... Method for producing self- emulsifiable aqueous polyurethane...

2005-02-15

2005-02-15

Niland, Patrick D. (Department: 1714)

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...

C524S839000, C524S840000

Reexamination Certificate

active

06855764

ABSTRACT:
A method for producing self-emulsifiable, aqueous polyurethane resins by a) preparing a premix of polyol component including a least one diol having a molar mass of 500 to 5,000 Dalton, at least one polyhydroxyalkane at least one anionically modifiable dihydroxyalkane-carboxylic acid and 0 to 9 parts by weight of a solvent component in desired ratios; b) reacting a polyisocyanate component the premix from stage a) to give a polyurethane preadduct, c) reacting the polyurethane preadduct from stage b) with either the premix from stage a) or with an anionically modifiable dihydroxyalkanecarboxylic acid to give a polyurethane prepolymer; d) mixing the polyurethane prepolymer from stage c) with a prepared mixture of water, a neutralizing component and an antifoam component; and thereafter or simultaneously reacting the aqueous polyurethane prepolymer from stage d) with a chain-extending component which is diluted with water.

REFERENCES:
patent: 6635723 (2003-10-01), Maier et al.
patent: 198 12 751 (1999-10-01), None
patent: 0 204 938 (1986-12-01), None
patent: WO 9950325 (1999-10-01), None

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