Abstract:
A fibrous material, which can be a filament, fabric, or a film, having increased whiteness and a desirable luster is produced by a process which comprises treating the fibrous material comprising a polyamide matrix having polyester microfibers dispersed therein with a hot, aqueous caustic solution containing about 0.5 to 10, preferably about 2 to 6, weight percent of a caustic material which can be an alkali metal oxide or hydroxide or an alkali metal salt of a weak acid which is capable of producing a pH of at least about 12.5 at a concentration of 0.1N in aqueous solution, at a temperature of at least about 95* C, for a period of time sufficient to remove a portion of the polyester microfibers to produce elongated microvoids in the fibrous material thereby increasing the whiteness and imparting a lustrous effect to the fibrous material.
Abstract:
WHERE R is an alkyl or aralkyl radical having seven to 24 carbon atoms, R can contain one or two oxygen atoms as ester or ether linkages, R'' is alkylene, and has from two to ten carbons, and x, y and z are each at least 1 and total 10, or preferably 3, are coated on nylon fiber or added to nylon polymer before spinning, improved dyefastness is achieved when the fiber is exposed to ozone.
WHERE R is an alkyl or aralkyl radical having seven to 24 carbon atoms, R can contain one or two oxygen atoms as ester or ether linkages, and x and y are integers such that x and y are each at least 1, and x + y is not more than 10, preferably 2, or ditertiary amines such as
When from about 0.1 percent to about 8 percent of tertiary amines such as: