C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/1008, 400/307
C08J 5/18 (2006.01) C08K 3/22 (2006.01) C08L 23/00 (2006.01) C08L 23/04 (2006.01) C08L 23/20 (2006.01)
Patent
CA 1273724
ABSTRACT OF THE DISCLOSURE A fire-retardant sheet material, the manufacture thereof and a fire-retardant polymer composition are disclosed. The sheet is manufactured from a composition of polyethylene, 55 to 75% by weight of the composition of alumina trihydrate and/or magnesium hydroxide, and optional- ly zinc borate and/or calcium carbonate, at least 2% by weight of the composition being in the form of a graft copolymer with an ethylenically unsaturated carboxylic acid or anhydride. The composition has a melt index of 0.05 to 4.0 dg/min. In an embodiment, the graft copolymer has a shear viscosity at 200°C and a shear rate of 400 sec-1 that is not more than 50% of that of the polyethylene. The sheet material may be used for, in particular, ceiling tile. In embodiments of the composition, 60 to 90% by weight may be alumina trihydrate and/or magnesium hydroxide, and optional- ly zinc borate and/or calcium carbonate. DC-0192
511981
Harbourne David A.
Lundhild Evelyn M.
Du Pont Canada Inc.
Harbourne David A.
Lundhild Evelyn M.
Mccallum Brooks & Co.
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