Appeal No. 96-3991
Application No. 08/311,242
1. A flame retardant plastic article consisting
essentially of a core of plastic polymeric material having
coated thereon a protective, flame retardant layer, the
protective flame retardant layer consisting essentially of (i)
a thermoplastic polymeric material selected from the group
consisting of a polyolefin and blends of polyolefins and (ii)
a flame retardant, char-forming, intumescent system containing
a flame retardant, char-forming, intumescent additive and a
catalyst selected from the group consisting of a phosphoric
acid precursor, a polyphosphoric acid precursor, and
combinations of the phosphoric acid precursor and the
polyphosphoric acid precursor.
The examiner relies upon the following references as
evidence of obviousness:
Fulmer 4,254,177 Mar. 3, 1981
Scarso 4,997,876 Mar. 5, 1991
Staendeke et al. (Staendeke) 5,312,853 May 17, 1994
(filed Sep. 23, 1993)
Appellant's claimed invention is directed to a flame
retardant plastic article consisting essentially of a core of
plastic polymeric material having a protective, flame
retardant layer coated thereon. The protective flame
retardant layer consists essentially of a thermoplastic
polymeric material, such as a polyolefin, and a flame
retardant, char-forming, intumescent (FRI) system. According
to appellant, FRI systems have been known in the art for
incorporation into plastic materials and for coating plastic
materials. However, we are told that FRI systems have not
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