Stock material or miscellaneous articles – Structurally defined web or sheet – Physical dimension specified
Patent
1986-06-26
1988-02-02
Lilling, Herbert J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Physical dimension specified
524404, 524405, 524436, 524437, 524504, 525285, C08K 320
Patent
active
047228580
ABSTRACT:
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 optionally 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.degree. C. and a shear rate of 400 sec.sup.-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 optionally zinc borate and/or calcium carbonate.
REFERENCES:
patent: 3956236 (1976-05-01), Gaylord
patent: 4071494 (1978-01-01), Gaylord
patent: 4071581 (1978-01-01), Yokoyama
patent: 4464495 (1984-08-01), Brown
Derwent Abs. 72552 C/41 (8-80), Japan 55112248.
Derwent Abs. 26473 C/15 (3-80), Japan 55-029542.
Derwent Abs. 703481/27 (C83-063519), Japan 58-091715, Sumitomo.
Derwent Abs. 44870k/19 (C83-043649), Japan 58-053438, Sumitomo.
Harbourne David A.
Lundhild Evelyn M.
Du Pont Canada Inc.
Lilling Herbert J.
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