| 摘要 |
PURPOSE:To obtain a developer prevented from offset without using an offset preventing liquid and fixable at a lower fixing temp. by using a binder resin composed essentially of a vinyl type polymer obtained by polymerizing a vinyl type monomer with a vinyl type cross-linking agent in an amt. of 0.005wt% of the monomer. CONSTITUTION:The binder resin is prepared by copolymerizing a styrene or its deriv. for forming the main skeleton of the resin, with an ethylenic monocarboxylic acid or its ester for controlling the thermal characteristics, such as softening point, triboelectrifiability and triboelectrification amt. As the vinyl type crosslinking agent, a compd. having >=2 double bonds, such as divinylbenzene, is used. The absolute value of the inclination of the apparent viscosity measured with the flow tester of the KOKA Method is regulated to <=0.15ln(poise)/ deg.C, and the sum of the max. value of a higher side deviation from the regressed straight line of the apparent viscosity and the max. value of a lower side deviation is controlled to >=2.0X10<5> poise in the viscosity range of 1.0X10<5>-1.0X10<6> poise. The softening point of this flow tester is, preferably, within 100-160 deg.C. |
