Mitsui Chemicals, Inc.

Yuichi Kaida

Kuniaki Kawabe

Hirotaka Kanaya

Masakazu Tanaka

Keiichi Taki

Provided is a resin composition which contains (A) a polyethylene wax satisfying the requirements (i)-(iv) described below and (B) at least one resin selected from the group consisting of thermoplastic resins and thermosetting resins, wherein the mass ratio of (A) to (B) is from 0.1/99.9 to 50/50. This resin composition is useful for providing a toner which can be fixed by means of a relatively-low-temperature heating body and has good offset resistance, and which is suppressed in increase of particle diameters even if the toner is stored for a long period of time. (i) The weight average molecular weight (Mw) is within the range from 400 to 1,500. (ii) The molecular weight distribution (Mw/Mn) is within the range from 1.2 to 2.5. (iii) The penetration as measured at 25&#xb0; C. is 5 dmm or less. (iv) The melting point (Tm) is within the range from 50&#xb0; C. to 110&#xb0; C.

Resin composition, toner for electrophotography and hot melt composition

Provided is a resin composition containing: (A) an ethylene/&#x3b1;-olefin copolymer containing 91.0-99.9 parts by mole of (a) an ethylene-derived unit and 0.1-9.0 parts by mole of (b) a C-C&#x3b1;-olefin-derived unit (wherein (a)+(b) is 100 parts by mole), while satisfying the requirements (i)-(iv) and (B) a thermoplastic resin and/or a thermosetting resin, wherein the mass ratio (A)/(B) is 0.1/99.9 to 50/50. This resin composition is useful for providing a toner which can be fixed by a relatively-low-temperature heating body and has good offset resistance, and which is suppressed in increase of particle diameters even if the toner is stored for a long time. (i) The Mw is 400 to 1,500. (ii) The Mw/Mn is 1.2 to 2.5. (iii) The penetration measured at 25&#xb0; C. is 13 dmm or less. (iv) The melting temperature is 50&#xb0; C. to 110&#xb0; C.

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Yamaguchi, Japan

Yuichi Kaida