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US 5,211,746 AGranted
Flame retardant compositions
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsMichael J. Keogh, Jinder Jow
Life of this patent
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Abstract
A composition comprising: (a) polyethylene having a density equal to or less than 0.925 gram per cubic centimeter, grafted with an unsaturated aliphatic diacid anhydride; and (b) magnesium hydroxide, surface treated with a saturated or unsaturated carboxylic acid or a metal salt thereof in an amount of about 0.1 to about 1 part by weight of acid or salt per 100 parts by weight of magnesium hydroxide.
Claims12
A flame retardant composition comprising:
- (a) polyethylene having a density equal to or less than 0.925 gram per cubic centimeter, grafted with an unsaturated aliphatic diacid anhydride;
- and
- (b) magnesium hydroxide, surface treated with a saturated or unsaturated carboxylic acid or a metal salt thereof in an amount of about 0.1 to about 1 part by weight of acid or salt per 100 parts by weight of magnesium hydroxide.
A flame retardant composition comprising:
- (a) polyethylene having a density in the range of 0.860 to 0.915 gram per cubic centimeter, grafted with maleic anhydride in an amount of about 0.1 to about 2 parts by weight of maleic anhydride per 100 parts by weight of polyethylene;
- and
- (b) about 100 to about 180 parts by weight of magnesium hydroxide per 100 parts by weight of anhydride grafted polyethylene wherein the magnesium hydroxide has the following characteristics:
- (i) a strain in the <101>
- direction of not more than 3.0 .times. 10.sup.-3 ;
- (ii) a crystallite size in the <101>
- direction of more than 800 angstroms;
- and (iii) a surface area, determined by the BET method, of less than 10 square meters per gram, said magnesium hydroxide having been surface treated with an unsaturated carboxylic acid having about 8 to about 24 carbon atoms in an amount of about 0.15 to about 0.5 part by weight of acid per 100 parts by weight of magnesium hydroxide.
5 more elements
Dependencies are inferred from the claim text.