Title:
ETHYLENE/PENTENE-1 COPOLYMER FOR INJECTION MOLDING AND INJECTION-MOLDED MATERIAL OF SAID COPOLYMER
Document Type and Number:
Japanese Patent JPH04120108
Kind Code:
A
Abstract:
PURPOSE:To obtain the subject new copolymer particularly suitable for producing an injection-molded material having excellent environmental stress cracking resistance and transparency 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 2.0-50g/10min measured by ASTM-D-1238E, a density (d) in the range of 0.900-0.945g/cm<3> measured by ASTM-D-1505 and a content of repeating unit derived from pentene-1 in the range of 2-20wt.%. A pressed board having 2mm thickness molded from the copolymer by applying ASTM- D-1928 method exhibits >=10hr environmental stress-cracking resistance (ESCR) measured by ASTM-D-1692 and <=20% haze (Haze) measured by ASTM-D-1003 and the above-mentioned values satisfy formula I and formula II.
Inventors:
KAMIYAMA MASAKI
YAMADA MASAYA
KIOKA MAMORU
SHIMONISHI SHOGO
YAMADA MASAYA
KIOKA MAMORU
SHIMONISHI SHOGO
Application Number:
JP23961990A
Publication Date:
April 21, 1992
Filing Date:
September 10, 1990
Export Citation:
Assignee:
MITSUI PETROCHEMICAL IND
International Classes:
B29C45/00; C08F210/16; C08K5/09; C08K5/13; C08K5/17; C08K5/36; C08K5/52; C08K5/524; C08L23/08; B29K23/00; (IPC1-7): B29C45/00; B29K23/00; C08F210/16; C08K5/09; C08K5/13; C08K5/17; C08K5/36; C08K5/524; C08L23/08
Attorney, Agent or Firm:
Shunichiro Suzuki
Previous Patent: ETHYLENE/PENTENE-1 COPOLYMER FOR ROTATIONAL MOLDING AND ROTATIONALLY MOLDED MATERIAL
Next Patent: 車載レーダシステム
Next Patent: 車載レーダシステム