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US 5,496,888 AGranted
Resin compositions for electrophotographic toner and process for making the same
AssigneeSanyo Chemical Industries, Ltd.
InventorsMasaharu Nishida, Tohru Ohhama
Life of this patent
Estimating the term…
Abstract
Resin compositions, comprising (A) a styrene/acrylic polymer and (B) a polyester dispersed therein with an average particle size of not more than 3 .mu., are obtained by quenching a mixture of (A) and (B) melted at 150.degree.-200.degree. C., below the glass transition temperature of the polymer (A) within 5 minutes, and are of good thermal shelf stability and electrical properties and provide toner binders of high hot offset causing temperature and improved low temperature fixing properties.
Claims20
A resin composition suitable for electrophotographic toner, which comprises
- (A) a non-crosslinked polymer having a glass transition temperature of 55.degree.-80.degree. C., obtained by polymerizing (a) one or more styrenic monomers, or (b) one or more acrylic or methacrylic monomers, or mixtures of (a) and (b), or any of the foregoing with another monomer (c),
- (B) a non-crosslinked non-crystallizable saturated polyester having a glass transition temperature of 36.degree.-60.degree. C., and optionally
- (C) a compatibilizer, wherein said compatibilizer is a graft or block polymer having a moiety of polymer of at least one monomer selected from the group consisting of styrenic monomer and acrylic or methacrylic monomer, and a moiety of a polyester, and wherein
- said polyester (B) is dispersed, within a matrix of said polymer (A), with an average particle size of not more than 3 .mu., and wherein
- said composition of (A) and (B) and optionally (C) has a number-average molecular weight of about 2,000 to about 15,000 and weight-average molecular weight of about 100,000 to about 1,000,000.
2 more elements
Dependencies are inferred from the claim text.