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...
Reexamination Certificate
2005-12-22
2011-11-22
Wu, David W (Department: 1762)
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...
C427S372200, C427S385500
Reexamination Certificate
active
08063132
ABSTRACT:
The invention provides a coating composition containing boehmite particles and a dispersant which comprises a compound having an anchoring moiety linked to a polymeric hydrophilic moiety, the anchoring moiety containing at least one acid and/or hydroxy group and having overall acidity or neutrality and the polymeric moiety having a lower affinity for a boehmite surface than the anchoring moiety. The anchoring moiety preferably contains at least two acid groups, preferably carboxylic acid groups, attached either in a [1,1], [1,2] or [1,3] relationship and is linked to the polymeric moiety, which is preferably derived from acrylamide or methacrylamide monomer units, preferably by a sulfur atom. The dispersant can reduce the viscosity of the boehmite dispersion and the tendency of the boehmite dispersion to increase in viscosity and/or form a gel or a yield stress material following periods of high shear stress.
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Saeed Farrokhpay et al;Surface And Colloid Science; “Role Of Polymeric Dispersant Functional Groups In The Dispersion Behaviour Of Titania Pigment Particles”; vol. 128; 2004; pp. 216-220.
Hone John H.
Howe Andrew M.
Pitt Alan R.
Wear Trevor J.
Anderson Andrew J.
Eastman Kodak Company
Reddick Marie
Wu David W
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