ETHYLENE/PENTENE-1 COPOLYMER FOR ROTATIONAL MOLDING AND ROTATIONALLY MOLDED MATERIAL

Japanese Patent JPH04120107

A

PURPOSE:To obtain the subject copolymer suitable for producing a rotationally molded material in a short molding cycle having excellent environmental stress cracking resistance and impact resistance having a specific melt flow rate, density and ethylene/pentene-1 content expressed in terms of monomer weight. CONSTITUTION:Ethylene and pentene-1 are copolymerized in the presence of a catalyst comprising a component of MgCl2 carrying Ti-tetraethoxide and an organic Al compound to afford the aimed copolymer having a melt flow rate (MFR) in the range of 1.0-20g/10min a density (d) in the range of 0.900-0.945g/cm<3> and a content of repeating unit derived from pentene-1 in the range of 2-20wt.%. A pressed board having 2mm thickness using the copolymer exhibits >=20hr environmental stress-cracking resistance (ESCR) and molding cycle (MS) for molding a cylindrical bottle having 20l volume using powder of the copolymer comprising <=4wt.% not passing through 32 mesh sieves, <=3wt.% passing through 200 mesh sieves and >=80wt.% from passing through 32 mesh sieves to not passing of 80 mesh sieves is <=15min/piece, and the above- mentioned values satisfy formula I and formula II.

KAMIYAMA MASAKI
YAMADA MASAYA
KIOKA MAMORU
SHIMONISHI SHOGO

JP23961890A

April 21, 1992

September 10, 1990

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MITSUI PETROCHEMICAL IND

C08K5/09; B29C41/04; C08F210/16; C08K5/13; C08K5/17; C08K5/36; C08K5/52; C08K5/524; C08L23/08; B29K23/00; (IPC1-7): B29C41/04; B29K23/00; C08F210/16; C08K5/09; C08K5/13; C08K5/17; C08K5/36; C08K5/524; C08L23/08

Shunichiro Suzuki

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