Appeal 2007-1386
Application 10/439,922
and/or sulphonate groups by the reaction of prepolymers containing free
isocyanate groups with organic diaminocarboxylates and/or organic
diaminosulphonates and/or organic dihydroxycarboxylates and/or
organic dihydroxysulphonates in the aqueous or organic phase using
isocyanate prepolymers which are virtually free from free monomeric
diisocyanates” (col. 1, ll. 10-19).
2) In Example 1, Lorenz discloses preparation of an isocyanate
prepolymer by reacting an anhydrous polyether of tetrahydrofuran with
hexamethylenediisocyanate (HDI). The isocyanate prepolymer was
subjected to thin layer distillation to remove unreacted HDI. A
dispersion was prepared by reacting the distilled isocyanate prepolymer,
dissolved in acetone, with N-(2-aminoethyl)-2-aminoethane sulphonic
acid sodium (AAS-Na) in the form of an aqueous solution. Water was
added for dispersion with stirring so that after removal of the acetone by
distillation, the dispersion obtained had a solid content of about 35%.
3) Dieterich discloses polyurethane anionomers which may be
produced from the following starting materials: (a) hexamethylene
diisocyanate; (b) triethylene glycol or tetraethylene glycol or technical
mixtures of these glycols; (c) optionally other low molecular weight
glycols; and (d) glycols having a molecular weight below about 500 and
containing free carboxyl, carboxylate, sulphonic acid or sulphonate
groups (col. 2, ll. 33-61). According to Dieterich, component (d) is
preferably a sodium salt of 1,4-dihydroxy-2-butane sulphonic acid or
3,4-dihydroxy-1-butane sulphonic acid (col. 3, ll. 7-9).
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Last modified: September 9, 2013