Appeal 2007-2863
Application 10/934,507
1 Thereafter, a mixture of m-xylylenediamine (0.75 part) and
2 diethylamine (0.09 part) was dissolved in DMAc so as to make a
3 concentration of 30%, and the solution thus obtained was dropwise added
4 as a curing agent solution to the urethane prepolymer solution (100 parts by
5 weight) vigorously stirred at room temperature to carry out a
6 polymerization reaction to obtain a polyurethane urea resin solution. The
7 amino groups [―NH2] on the amines react with the available isocyanate
8 groups [―NCO] on the prepolymer to form urea groups
9 [―NH―CO―NH-] whereas a hydroxyl group [―OH] reacts with an
10 isocyanate group [―NCO] to form a urethane group [―NH―CO―O―].
11 Accordingly, the product is both a polyurethane resin and a polyurea resin
12 since it will have both urethane and urea groups.
13 DMAc was evaporated and the polyurethane urea resin solution was
14 dried to obtain a film-like sample having a thickness of 200 µm.
15 The hardness and tensile strength of the film are not reported.
16
17 Final Rejection
18 The Examiner rejected claims 1-16 as anticipated by, or as being
19 unpatentable for obviousness, over Saito (WO).
20 The Examiner made the following findings and observations.
21 Saito describes, in Example 1, a prepolymer made from an isocyanate
22 [MDI] and a mixture of low unsaturation polyols having a number average
23 molecular weight of greater than 8000 and a [hydroxyl] functionality of
24 about 2.01. Final Rejection, page 2.
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