| 摘要 |
The alkali-soluble polyester resins described herein contain trimellitic anhydride in the amount of 41 to 44 parts by weight, dipropylene glycol in the amount of 28 to 31 parts by weight, glycerol in the amount of 6.3 to 7.2 parts by weight and castor oil in the amount of 20 to 26 parts by weight of the total composition. In addition, neopentyl glycol may be substituted for dipropylene glycol in amounts up to 16 parts by weight of the total composition, in which case the combined proportion of dipropylene glycol and neopentyl glycol may be reduced to 26.5 parts by weight. The components are proportioned within the ranges stated to give an OH/COOH ratio of from 1.05:1 to 1.15:1. When fully cured, the resins are useful as insulating coatings on wire.
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