Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2005-12-28
2008-10-21
Eashoo, Mark (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C524S589000
Reexamination Certificate
active
07439316
ABSTRACT:
A process for the preparation of stable aqueous polycarbodiimide dispersions, to be used as crosslinking agent, which are free of organic solvents is described. Sid process is characterized in: reacting a polyisocyanate in the presence of a carbodiimide catalyst to form a polycarbodiimide, terminating and/or chain extending the polycarbodiimide chain by the addition of formation dispersion of the resulting compound in water, wherein pH is adjusted to a value between 9 and 14 by the addition of a base and/or a buffer to the water used for the dispersion and/or to the obtained aqueous dispersion. According to the present process said terminating or chain extending with the compound containing a hydrophylic group and one or more amine functions may also occur during or after the dispersion of the polycarboiimide in water. The preferred pH of the polycarbodiimide dispersions is between 11 and 13. Furthermore the invention related to a coating mixture comprising the polycarbodiimide dispersions obtained by the invention as crosslinking agent and an aqueous resin containing carboxylic acid functions. Finally the invention comprises cured material obtained by applying said coating mixture to a substrate, and evaporating the water.
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Synthesis, characterization, and stability of carbodiimide gorups in carbodiimide-functionalized latex dispersions and films. Pham, Hung H., et al. Journal of Polymer Science, Part A: Polymer Chemistry (2000), Wol. 38(5), pp. 855-869. Full document.
Derksen Andries Johannes
Hesselmans Laurentius Cornelius Josephus
Munneke Jacob Christiaan
Eashoo Mark
Frank Noah
Myers Jeffrey D.
Peacock & Myers, P.C.
Stahl International B.V.
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