Mitsui Petrochemical Industries, Ltd.

Yozo Yamamoto

Satoru Moriya

Syuji Minami

Hidekuni Oda

Yoshinori Akana

Fumitoshi Ikejiri

Hirokazu Kajiura

Akio Ishimoto

Takao Ohno

Kotaro Kishimura

Cycloolefin type random copolymer compositions

A random copolymer consisting essentially of 40 to 90 mole% of propylene and 60 to 10 mole% of 1-butene, and having (A) a boiling n-heptane-insoluble content of not more than 5% by weight based on the weight of the copolymer, (B) a boiling methyl acetate-soluble content of not more than 2% by weight based on the weight of the copolymer, (C) a melting point, determined by differential thermal analysis, of 40 to 140.degree. C., (D) an intrinsic viscosity, determined in decalin at 135.degree. C., of 0.5 to 6 dl/g, (E) an elongation at break, measured by JIS K6301, of at least 300%, (F) a tensile strength at break, measured by JIS K6301, of at least 50 kg/cm.sup.2, and (G) a haze, measured by JIS K6714, of not more than 40%. The above copolymer has superior properties for production of various kinds of melt-shaped articles such as films, sheets, vessels and tubes, and can be obtained by copolymerizing propylene and 1-butene in the presence of a catalyst prepared from a solid complex containing magnesium, titanium and halogen, an organometal compound of a metal of Groups I to III of the periodic table, and an electron donor.

Random copolymer of propylene and 1-butene and process for its production

Growing community of inventors

Kuga, Japan

Yozo Yamamoto