| 摘要 |
PURPOSE:To obtain a magnetic layer which excels in adhesive properties to a substrate, heat resistance and square ratio, respectively, by using a specific denatured polyester to a binder which forms the magnetic layer. CONSTITUTION:The polyester of 1,000-20,000mol weight contains 0.2-10mol% maleic acid component of the polyester, etc. which is obtained by a reaction among the maleic acid or its anhydride, a saturated dicarboxylic acid or its anhydride and glycol. Such polyester is reacted with a carboxylic acid which has a conjugated double bond of sorbic acid, linoleic acid, dehydrogeranium acid, heptatri-1,3,5-en-1-carboxylic acid, nonatetra-1,3,5,7-en-1-carboxylic acid, 1-phenyl- 4-carboxybutadiene eleostearic acid, etc. Thus the denatured polyester is obtained and used as a binder to form a magnetic layer. |
