Aqueous polyurethane/urea dispersions containing...

Details Aqueous polyurethane/urea dispersions containing... Aqueous polyurethane/urea dispersions containing...

2007-07-03

2007-07-03

Cain, Edward J. (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...

C524S588000, C524S591000, C524S837000, C524S839000, C524S840000

Reexamination Certificate

active

10736170

ABSTRACT:
Polyurethane/ureas including hydrophilic moieties and alkoxysilane groups of formula (I)in-line-formulae description="In-line Formulae" end="lead"?—X—CO—NR2—Y—Si—(Z)3  (I)in-line-formulae description="In-line Formulae" end="tail"?where X is O or NR2; R2is H, C1-C6alkyl, substituted C1-C6alkyl, cycloalkyl, aryl or benzyl; Y is C1-C8linear and branched alkylene; and Z is an organic group inert to isocyanate groups below 100° C. At least one Z group is an alkoxy group of 1 to 4 carbon atoms. The polyurethane/urea can be in an aqueous dispersion, which can be used to prepare coatings. The dispersion is prepared by(ii) reacting an organic polyisocyanate with a high molecular weight polyol, optionally a low molecular weight isocyanate-reactive compound, an isocyanate-reactive compound containing hydrophilic groups, and/or an amine chain extender forming a prepolymer;(ii) reacting the prepolymer in (i) with a compound of formula (II)in-line-formulae description="In-line Formulae" end="lead"?OCN—Y—Si—(Z)3  (II)in-line-formulae description="In-line Formulae" end="tail"?where Y and Z are as defined; and(iii) dispersing the reaction product in (II) in an aqueous medium.

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Advances in Urethane Science & Technology, vol. 10, (month unavailable) 1987, pp. 121-162, James W. Rosthauser and Klaus Nachtkamp, “Waterborne Polyurethanes”.

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