초록 ▼

A fire retarding polypropylene composition comprising a copolymer of polypropylene and an ethylene/propylene rubber, 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 i

A fire retarding polypropylene composition comprising a copolymer of polypropylene and an ethylene/propylene rubber, 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 direction of not more than 3.0.times.10-3, (ii) a crystallite size in the direction of more than 800 .ANG., and (iii) a specific surface area, determined by the BET method, of less than 20 mg2/g. The composition can be used in a fire retarding semiconductor apparatus which passes the FMRC Clean Room Materials Flammability Test Protocol.

대표청구항 ▼

1. A method of making a clean room surface component comprised of composition, wherein said composition comprises:(a) a copolymer 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

1. A method of making a clean room surface component comprised of composition, wherein said composition comprises:(a) a copolymer 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 agent, wherein said method includes the steps of:(a) forming pieces from said composition, said pieces being adapted to form said clean room surface component; and (b) bonding said pieces using thermoplastic welding to make a semiconductor clean room component.