Fire retarding polypropylene composition
AssigneeCompression Polymers Group
InventorJerry Wagner
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Abstract
A fire retarding polypropylene composition comprising a copolymer of polypropylene in which ethylene/propylene rubber has been grafted onto the polypropylene chains, and at least about 50% by weight but not greater than 60% by weight of a magnesium hydroxide coated with an anionic surface active agent, the magnesium hydroxide having (i) a strain in the <101> direction of not more than 3.0×10−3, (ii) a crystallite size in the <101> direction of more than 800Å, and (iii) a specific surface area, determined by the BET method, of less than 20 mg2/g. The composition may be used in the formation of articles adapted to be used in a clean room, which pass the FMRC standards.
Claims4
A fire retarding polypropylene composition comprising:
- (a) a copolymer of polypropylene resin in which ethylene/propylene rubber has been grafted onto the polypropylene chains;
- and
- (b) at least about 50% but not greater than 60% by weight of a magnesium hydroxide coated with an anionic surface active agent, the magnesium hydroxide having:
- (i) a strain in the <101> direction of not more than 3.0×10−3,
- (ii) a crystallite size in the <101> direction of more than 800Å, and
- (iii) a specific surface area, determined by the BET method, of less than 20 mg2/g,
- wherein the composition being adapted to meet FMRC standards for use in a clean room.
Dependencies are inferred from the claim text.