Appeal 2007-1905
Reissue Application 10/931,249
Patent 6,444,720 B1
1 The "novelty" in the Bayer foams is the use of a poly(oxyalkylene)
2 polyol which "has an hydroxyl value from 3 to 90, preferably 3 to 60 and
3 contains not more than 15 mmole.kg-1 [millimole per kilogram] preferably
4 not more than 12 mmole.kg-1 of carbon-carbon double bonds."
5 Specification, col. 2:8-11 and col. 2:51-56.
6 The polyols used in the Bayer invention can be made by "polyaddition
7 of alkylene oxides to polyfunctional starter compounds in the presence of
8 caesium [cesium], rubidium, strontium or barium hydroxide or alternative
9 basic catalysts …." Specification, col. 2:62-66.
10 Other polyether polyols can be used in combination with polyols
11 having reduced carbon-carbon double bonds. Specification, col 3:64
12 through col. 4:7.
13 The preferred blowing agent is said to be water. Specification,
14 col. 5:12-15.
15 Catalysts which accelerate the reaction between the isocyanate and the
16 polyol may be used. Specification, col. 5:32-51.
17 One catalyst said to be "particularly preferably" useful is
18 N-(dimethylaminoethyl)-N-methylethanolamine. Specification,
19 col. 5:48-49.
20 The "particularly preferably" useful tertiary amine is said to be
21 commercially available under the registered mark DabcoŽ T from Air
22 Products.
23 The open-cell rigid polyurethane foams made according to the
24 invention are said to be useful inter alia as (1) intermediate layers for
25 composite elements, (2) filler substrates for vacuum insulation panels and
5
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Last modified: September 9, 2013