Toner resin composition and toner prepared therefrom

• US 6,106,988 A
• Filed: 02/10/1999
• Issued: 08/22/2000
• Est. Priority Date: 12/13/1996
• Status: Expired due to Term

• Current Assignee: Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Original Assignee: Sekisui Chemical Company Limited (Sekisui)
• Inventors: Furukawa, Toshiharu, Ueyama, Takashi, Okudo, Masazumi, Takehara, Hiroaki
• Primary Examiner(s): CHAPMAN, MARK A
• Application Number:
  US09/247,553
• Time in Patent Office: 559 Days
• Field of Search: 430/110
• US Class Current: 430/109.3
• CPC Class Codes: G03G 9/08704 Polyalkenes
• CPC Class Codes: G03G 9/08711 with esters of acrylic or methacrylic acid

Abstract

A toner resin composition, as well as a toner prepared therefrom, are disclosed which are excellent in fixability, offset resistance and storage stability, and which result in reduced occurrence of DF staining.

The toner resin composition includes (a) a vinyl copolymer containing 25 or lower % by weight of molecular species having molecular weights of 200,000 or higher; and (b) 3 to 10% by weight of ethylene-based olefin polymer which has a DSC-determined peak (melting point) within a range of 85-100° C., a weight average molecular weight (Mw) within a range of 500-900, a number average molecular weight (Mn) within a range of 500-900, and a melt viscosity of 10 to 17 cps at 100° C.

Claims

1. A toner resin composition including:

(a) a vinyl copolymer containing 25 or lower % by weight of molecular species having molecular weights of 200,000 or higher; and

(b) 3 to 10% by weight of polyethylene having a DSC-determined peak (melting point) within a range of 85-100°

C., a weight average molecular weight (Mw) within a range of 500-900, a number average molecular weight (Mn) within a range of 500-900, and a melt viscosity of 10 to 17 cps at 100°

C.

2. The toner resin composition of claim 1, wherein said vinyl copolymer is prepared principally from a styrene monomer and a (meth)acrylic ester monomer.

3. A toner prepared principally from a colorant and the toner resin composition of claim 1.

5. A toner prepared principally from a colorant and the toner resin composition of any one of claims 1, 2 or 4.

4. A toner resin composition including:

(a) a vinyl copolymer prepared principally from a styrene monomer and a (meth)acrylic ester monomer; and

(b) 3 to 10% by weight of an polyethylene having a DSC-determined peak (melting point) within a range of 75-110°

C., a weight average molecular weight (Mw) within a range of 400-2,000, a melt viscosity in the range of 5-1,000 cps at 120°

C. and a thermal property as defined by W1/W2≧

1 wherein W1 is an endothermic heat accompanying its fusion in the temperature region ≧

Tm, W2 is an endothermic heat accompanying its fusion in the temperature region <

Tm and Tm is said DSC-determined peak.