Appeal 2007-2863
Application 10/934,507
1 With reference to the English language version (Saito), Example 1
2 describes the following information (col. 7:46 through col. 8:11).
3 Polyol A (177 parts) and Polyol B (78 parts) were mixed to provide a
4 polyol mixture with a substantial average hydroxyl group number of 2.0.
5 Polyol A has an unsaturation of 0.029 (see Table 1) and Polyol B has an
6 unsaturation of 0.025 (see also Table 1). MDI (147 parts) was added
7 to the polyol mixture and the resultant mixture was reacted at 80º C. for
8 3 hours in a nitrogen atmosphere to produce a reaction product. MDI is the
9 diisocyante 4,4'-diphenylmethane diisocyante (col. 4:53-54).
10 The isocyanate content of the reaction product was 11.55 wt %.
11 Polyol PTMG (597 parts) was added thereto, and the resultant mixture
12 was further reacted for 3 hours under the same conditions to obtain an
13 isocyanate group-terminated polyurethane prepolymer (prepolymer P1)
14 having an isocyanate content of 2.14 wt %. Polyol PTMG is a polyol
15 obtained by ring-opening of tetrahydrofuran (col. 4:10-11). The isocyanate
16 content of 2.14 wt% was lower than a theoretical value of 2.25 wt %.
17 Saito therefore considered that the reaction was completely finished, i.e., all
18 hydroxy groups [―OH groups ]on the polyols which could react with an
19 isocyanate group [―NCO] had in fact reacted.
20 Saito states that the reaction could be carried out without using a
21 urethane-forming catalyst.
22 The prepolymer P1 thus obtained was dissolved in
23 N,N-dimethylacetamide (hereinafter referred to as "DMAc") to obtain
24 a urethane prepolymer solution having a solid content of 30 wt %.
6
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Last modified: September 9, 2013