| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a toner compsn. which has good low temp. fixing property, offset resistance and blocking resistance and which has good preventing property from winding and good dispersibility of a wax by using a specified polyester resin for high mol.wt. and a specified urethane-modified polyester resin as the essential components. SOLUTION: This compsn. essentially consists of a polyester resin for high mol.wt. and an urethane modified polyester resin. The polyester resin for high mol.wt. has a glass transition temp. of 10 to 60 deg.C and a hydroxyl value of 10 to 80 KOH mg/g, and is produced by polymn. condensation of diols, carboxylic acids, tervalent or polyvalent alcohols by 2 to 20 mol.% based on the whole source monomers, and long-chain aliphatic monocarboxylic acids or long-chain aliphatic alcohols by 2 to 20 mol.% based on the whole source monomers. The urethane-modified polyester resin is a reaction product of a polyester resin for high mol.wt. and a diisocyanate compd. by 0.1 to 0.6 mol per 1 equiv. of the polyester resin for high mol.wt.</p> |
