Mitsubishi Petrochemical Company Limited

Mitsubishi Chemical Corporation

Hitoshi Nimura

Toru Mori

Mitsutoshi Aritomi

Motohiro Munakata

Toshio Akai

Masayuki Tomida

Shinichi Yoshida

Makoto Kono

To provide a catalyst for production of a polyester, a process for producing a polyester using the catalyst and a titanium-containing polyethylene terephthalate having excellent characteristics. A catalyst for production of a polyester, characterized by comprising at least (1) a Group 4A compound (hereinafter referred to as compound (1)), (2) a compound of at least one element selected from the group consisting of magnesium, calcium and zinc (hereinafter referred to as compound (2)) and an oxygen-containing organic solvent. A process for producing a polyester using this catalyst. A titanium-containing polyethylene terephthalate, having characteristics represented by the following (A), (B) and (C):

Catalyst for production of polyester, process for producing polyester using it and titanium-containing polyethylene terephthalate

A method for producing a graft-modified copolymer comprising the step of subjecting 100 parts by weight of an unsaturated copolymer comprising an .alpha.-olefin of 3 to 12 carbon atoms and a cyclic olefin represented by the following formula (I), and 0.1 to 300 parts by weight of a radically polymerizable monomer to the radical polymerization conditions: ##STR1## wherein R.sup.1 is a C.sub.2-5 alkylidene group or a C.sub.2-5 alkenyl group, R.sup.2 is a C.sub.1-5 hydrocarbon radical or H, and n is 0, 1 or 2. The graft-modified copolymer is imparted with various properties which are attributed to the polymer chain formed from the radically polymerizable monomer, without the excellent properties inherent in an .alpha.-olefin polymer being impaired. The copolymer is excellent in compatibility with other resins.

Method for producing graft-modified copolymers

A novel component of a catalyst for polymerization of olefins, which is highly active, exhibits high stereoregularity and also provides polymers of very uniform particle sizes. The catalyst component is a contact product of the following component A and component B:

Component of catalyst for olefin polymerization

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Yokkaichi, Japan

Hitoshi Nimura