Appeal No. 1998-3147
Application 08/564,304
12. Process for the preparation of polyurethanes and
aqueous polyurethane dispersions comprising forming a
polyurethane in the presence of ethoxyethyl propionate as
viscosity-regulating, nonreactive component.
THE REFERENCES
Blum et al. (Blum) 4,981,921 Jan. 1,
1991
Chandalia et al. (Chandalia) 5,360,642 Nov. 1,
1994
(filed May 24,
1993)
Hille et al. (Hille) 5,370,910 Dec. 6,
1994
(§ 102(e) date Feb. 26,
1992)
THE REJECTION
Claims 1-16 stand rejected under 35 U.S.C. § 103 as being
unpatentable over Hille in view of Chandalia and Blum.
OPINION
We reverse the aforementioned rejection and remand the
application to the examiner.
Hille discloses a process for making a polyurethane resin
by preparing an intermediate from a specified mixture of
diols, diisocyanates and compounds which contain two groups
reactive toward isocyanate groups and have at least one group
capable of forming anions, the reaction optionally taking
3
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007