Polyurethane resin derived from hydrophilic polyol components

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

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C528S049000, C528S061000, C528S077000, C106S031130, C156S277000, C428S423100

Reexamination Certificate

active

07067607

ABSTRACT:
A polyurethane resin which is the reaction product of at least one diisocyanate and a group of components having isocyanate reactive functional groups. The group of components includes a first group of one or more polyether polyols each having an average molecular weight in the range of 1000 to 10000 g/mol, a second group of one or more polyether polyols each having an average molecular weight in the range of 400 to 10000 g/mol and being hydrophilic and water-soluble, a third group of one or more polyols each having an average molecular weight equal to or less than 800 g/mol, at least one amine, and a reaction terminating agent. The ratio of the equivalent weights of the diisocyanate to the components having isocyanate reactive functional groups is selected such that essentially all of the isocyanate groups of the diisocyanate are present only as the reaction product with one of said isocyanate reactive functional groups.

REFERENCES:
patent: 5654390 (1997-08-01), Gajewski et al.
patent: 0604890 (1994-07-01), None
patent: WO 01 14442 (2001-03-01), None
McGraw Hill Dictionaryof Scietific and Technical Terms; Fifth Edition; 1994; p. 696.
Römpp Lexikon, Lacke und Druckfarben, ed. U.Zorll, Georg Thieme Verlag, Stuttgart, New York 1998, p. 214 and 318.
Database WPI, Section Ch, Week 198945, Derwent Publication Ltd., London GB; Class A25, AN1989-322740 XP002153577 & JP 01 242674 A (Kuraray Co Ltd), Sep. 27, 1989 *abstract*.

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