Method for determining the compatibility of a direct or reactive dyestuff with a polybasic amino compound
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United States of America Patent
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Oct 22, 1985
Issued Date -
N/A
app pub date -
Jun 1, 1983
filing date -
Feb 14, 1981
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Expired
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Abstract
Dyeings on cellulose with direct or reactive dyestuffs are given improved wet fastness properties by aftertreatment with a reaction product or mixture of a polybasic amino compound (A) with an N-methylol compound (B) or with formaldehyde or a formaldehyde donor and optionally a crosslinking catalyst (C). Particular direct or reactive dyestuffs and polybasic amino compounds are determined to be suitable in the dyeing and aftertreatment when the dyestuff and the polybasic amino compound (A) are such that when mixed together in aqueous solution they give a precipitate which, after washing and drying does not redissolve in aqueous alkali at pH.gtoreq.12 at room temperature.
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