Viscose spin bath additive of an amphoteric surfactant
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United States of America Patent
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Apr 30, 2002
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app pub date -
Jan 4, 2000
filing date -
Jul 14, 1997
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Abstract
A method of reducing the clogging of nozzles and slits and diminishing the formation of deposits in a spin bath system in a process of making viscose filamentary and film materials by using, as a spin bath additive, an amphoteric surfactant having the formula I, and a spin bath system including an amphoteric surfactant having the formula I RNA (C.sub.n H.sub.2n NA).sub.x-1 A (I) where R represents a hydrogen or an aliphatic group with 1-24 carbon atoms, each A represents a hydrogen, an aliphatic group with 1-24 carbon atoms, or BOOCC.sub.m H.sub.2m -- groups, where m is a number from 1-3, B is hydrogen or a salt forming cation, n is a number from 2-3, x is 1-8, and the number of BOOCC.sub.m H.sub.2m -- groups are from 1 to x+2, with the provision that the total number of carbon atoms in the aliphatic groups is from 8 to 45. The amphoteric surfactant has an excellent anticlogging effect, since it is a good dispersant and prevents or reduces precipitation in the spin bath. In addition it exhibits low foaming and is very stable.
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