Aqueous PU dispersions with improved adhesion

Details Aqueous PU dispersions with improved adhesion Aqueous PU dispersions with improved adhesion

2007-07-11

2011-11-22

Eashoo, Mark (Department: 1767)

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...

C524S591000, C106S287250

Reexamination Certificate

active

08063138

ABSTRACT:
A process for preparing polyester-polyurethane resin dispersions comprising:A) reactingi) one or more polyol components having a number average molecular weight of at least 300 daltons, at least 60% by weight of component i) being a polyester polyol with the fraction of aromatic carboxylic acid groups relative to all of the carboxylic acid groups used to prepared said polyester polyol being at least 60 mol %,ii) optionally one or more polyol components having a number average molecular weight of 62 to 299 daltons, andiii) optionally a compound which is monofunctional for the purposes of the isocyanate polyaddition reaction and has an ethylene oxide content of at least 50% by weight and a number average molecular weight of at least 400 daltons, withiv) a polyisocyanate to form a prepolymer,B) dissolving the prepolymer in an organic solvent,C) reacting the prepolymer with v) one or more aliphatic and/or alicyclic primary and/or secondary polyamines having a number average molecular weight of 60 to 300 daltons, said polyamine optionally being in combination with hydrazine or hydrazine hydrate, and vi) a hydrophilicized aliphatic diamine,D) precipitating the product from C) by adding water to form a dispersion, andE) removing the organic solvent.

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