Appeal No. 1997-1161
Application 08/487,226
retardant composition for electrical insulation and sheathing
of wire and cables. The composition includes recited amounts
of a polyolefin polymer, a metal hydroxide or hydrated metal
salt, a polyolefin based polymer or oligomer grafted or
polymerized with a vinyl bearing species, and an
organopolysiloxane compound. Appellant states that the
composition does not evolve toxic or corrosive gases as it
burns (specification, page 1, lines 7-9). Claim 1 is
illustrative and reads as follows:
1. A flame retardant resin composition for electrical
insulation and sheathing of wire and cables which has enhanced
oil resistance and excellent processing characteristics,
comprising (a) 100 parts by weight of a polyolefin polymer,
(b) 50 to 200 parts by weight of metal hydroxide or hydrated
metal salt selected from the group consisting of aluminum
hydroxide, magnesium hydroxide, calcium hydroxide, basic
magnesium carbonate, and hydrocalcite, or mixtures thereof,
(c) 3 to 20 parts by weight of a polyolefin based polymer or
oligomer grafted or copolymerized with a vinyl bearing species
selected from the group consisting of a vinyl hydroxy
carboxylic acid, a vinyl carboxylic acid, a vinyl hydroxy
dicarboxylic acid, a vinyl dicarboxylic acid, and esters and
anhydrides thereof, which polyolefin (c) differs from olefin
(a), and (d) 1 to 10 parts by weight of an organopolysiloxane
compound wherein components (b) - (d) are all based on 100
parts by weight of the polyolefin polymer(a).
THE REFERENCES
Abolins et al. (Abolins) 4,497,925 Feb. 5, 1985
Yusawa et al. (Yusawa) 4,983,742 Jan. 8, 1991
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