Oligomer-containing mixtures useful as fiber surface treating ag

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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560 87, C08G 6368

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active

044463065

ABSTRACT:
A reaction between pyromellitic dianhydride (PMDA) and less than two moles of fluoroalcohol produces an intermediate with ester, free acid and anhydride groups. Reaction with an oxirane compound such as epichlorohydrin reacts at the acid sites to produce pendant hydroxyls which react with anhydride on adjacent molecules to produce oligomers. Products with fluoroalcohol:PMDA ratios of, for example, about 1:0.6 to about 1:0.85 produce treated fibers with improved retention of oil repellancy, especially when annealed at 100.degree.-130.degree. C.

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Application of Thomas et al., Ser. No. 350,544, filed Feb. 19, 1982.

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