| 摘要 |
<p>PURPOSE:To obtain the title resin excellent in grindability and storage stability and well balanced among offset resistance, blocking resistance and low- temperature fixability by using a specified aliphatic glycol and specifying the content of an at least tribasic carboxylic acid. CONSTITUTION:The polyester is prepared by polycondensing a carboxylic acid component comprising a dicarboxylic acid or its lower alkyl ester (A) and an at least tribasic carboxylic acid or its anhydride or lower alkyl ester (B) with a glycol component comprising a primary aliphatic glycol (C) having at least two side chains at least one of which is 2-4 C alkyl and an aromatic glycol (D) represented by the formula wherein R is 3 C or lower alkylene; x and y are each an integer of 1 or greater; and x+y is 2-7 on the average. The constitution ratio is such that 40-99mol%, based on the whole carboxylic acid component, component A, and 1-60mol%, based on the whole carboxylic acid component, component B are present. This polyester has a glass transition temperature of 50-75 deg.C and a gel fraction of below 3%.</p> |
