Mitsui Chemicals, Inc.

Noriko Kai

Takashi Yukita

Kuniaki Kawabe

Hiroshi Matsuoka

Masahiro Yamashita

Masakazu Tanaka

Junichi Mohri

Ikuko Ebisawa

Keiichi Taki

Akio Hayakawa

Junpei Tanaka

Akihiro Udagawa

Yuji Tokunaga

A lubricating oil composition includes an ethylene/&#x3b1;-olefin copolymer (A) having 70 to 90 mole % of structural units derived from ethylene and an intrinsic viscosity [&#x3b7;] of 0.3 to 1.0 dl/g.

Lubricating oil compositions and lubricating oil viscosity modifiers

The purpose of the present invention is to provide a method for efficiently producing an olefin (co)polymer containing a constituent unit derived from 1-butene, the (co)polymer having a molecular weight that is sufficiently high even for high temperature conditions that are beneficial for industrial production methods. This purpose can be achieved by means of a method for producing an olefin (co)polymer containing a constituent unit derived from 1-butene, wherein at least 1-butene and, if necessary, an &#x3b1;-olefin having 2 or more carbon atoms (excluding 1-butene) and other monomers are (co)polymerized in the presence of an olefin polymerization catalyst that contains (A) a crosslinked metallocene compound represented by general formula [I] and (B) at least one type of compound selected from among (b-1) an organic aluminum oxy compound, (b-2) a compound that forms an ion pair upon a reaction with the crosslinked metallocene compound (A), and (b-3) an organic aluminum compound, at a polymerization temperature of 55-200&#xb0; C. and a polymerization pressure of 0.1-5.0 MPaG.

Production method of olefin (co)polymer containing constituent unit derived from 1-butene

The present invention addresses the problem of providing an electrophotographic toner which has excellent storage property, is excellent in offset resistance and low-temperature fixing property during printing and has few substances causing staining with time, odor or dust inside a copy machine or a printer. The present invention relates to an electrophotographic toner characterized by containing an ethylene copolymer which comprises a constituent unit (a) derived from ethylene in an amount of 80 to 99.5% by mol and a constituent unit (b) derived from a cyclic olefin of 8 or more carbon atoms in an amount of 0.5 to 20% by mol [(a)+(b)=100% by mol] and satisfies the requirements: (i) the intrinsic viscosity [&#x3b7;] is in the range of 0.01 to 0.50 dl/g, and (ii) the crystallinity is in the range of 50 to 90%.

Electrophotographic toner

Growing community of inventors

Otake, Japan

Noriko Kai