Releasing composition and binder resin composition for electroph

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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430137, G03G 9087

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active

054665558

ABSTRACT:
A releasing composition for an electrophotographic toner, which comprises 60.about.99.5% by weight of a low molecular weight polypropylene (A), and 0.5.about.40% by weight of at least one modified polyolefin (B) selected from the group consisting of (B1) a modified polypropylene comprising a low molecular weight polypropylene (a1) having a melt viscosity at 160.degree. C. higher than that of said polypropylene (A), modified with an ethylenically unsaturated carboxylic acid or an anhydride thereof (b1), and (B2) a modified polyethylene comprising a low molecular weight polyethylene (a2) having a melt viscosity of 10.about.8,000 cps at 140.degree. C., modified with an ethylenically unsaturated carboxylic acid or an anhydride thereof (b2). A toner prepared from a combination of the releasing composition and a thermoplastic binder resin exhibits improved flowability without reducing the offset temperature of the toner.

REFERENCES:
patent: 5116713 (1992-05-01), Uchida et al.
patent: 5185405 (1993-02-01), Nishida
patent: 5238767 (1993-08-01), Horiie
Patent Abstracts Of Japan, vol. 10, No. 132 (P-456), May 16, 1986 & JP-A-60 254 149, Dec. 14, 1985.
Database WPI, Derwent Publications Ltd., AN 87-245442 & JP-A-62 166358, Jul. 22, 1987.
Database WPI, Derwent Publications Ltd., AN 91-122662, JP-A-03 063659, Mar. 19, 1991 & Corr. US 5,238,767.
Patent Abstracts Of Japan, vol. 17, No. 184 (P-1519), Apr. 9, 1993; Database WPI, Derwent Publication Ltd., AN 93-011853 & JP-A-04 337737, Nov. 25, 1992.

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