Appeal No. 2003-1625
Application No. 09/341,669
The subject matter on appeal relates to a method for
producing a molding composition (and to the molding composition
itself) consisting essentially of (1) a polymer comprised of 80-
100 weight percent of methyl methacrylate monomer units and 0-20
weight percent of C1 to C4-alkyl ester of acrylic acid monomer
units and (2) 0.0005 to 0.005 weight percent of a reducing
inorganic phosphorous compound. According to the appellants’
specification, the presence of the aforementioned phosphorous
compound results in an improvement in the yellow index of a
molding prepared from the molding composition. Further details
of this appealed subject matter are set forth in representative
independent claims 14, 28 and 32 which read as follows:
14. A method for producing a molding composition
consisting essentially of a polymer comprised of 80-100
weight-percent of methyl methacrylate monomer units and 0-20
weight-percent of C1-to C4-alkyl ester of acrylic acid
monomer units and a reducing inorganic phosphorus compound,
wherein the method comprises:
adding to said polymer 0.0005 to 0.005 weight-percent,
based on the weight of said polymer, of one or more reducing
inorganic phosphorus compounds selected from the group
consisting of phosphinic acid, phosphonic acid, alkali metal
salts of phosphinic acid, alkali metal salts of phosphonic
acid, alkaline earth salts of phosphinic acid, alkaline
earth salts of phosphonic acid, aluminum salts of phosphinic
acid, aluminum salts of phosphonic acid, ammonium salts of
phosphinic acid, and ammonium salts of phosphonic acid,
wherein the ammonium salts may be substituted with up to
four C1- to C4-alkyl and/or C5- to C8-cycloalkyl groups, and
2
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