Process for dyeing or printing/flame retarding aramids with N-octyl-pyrrolidone swelling agent
AssigneesBurlington Industries, Inc., ProChroma Technologies
InventorsBarbara J. Cates, Phillip H. Riggins, David R. Kelly
Life of this patent
Estimating the term…
Abstract
Poly(m-phenyleneisophthalamide) fabrics are printed and optionally flame retarded in a two-step process in which the dye diffusion promoting agent N-octyl-2-pyrrolidone optionally with a flame retardant is applied following by printing and print fixation.
Claims12
A process of printing a predetermined pattern on a poly(m-phenyleneisophthalamide) textile fabric comprising the successive steps of
- (a) supplying a poly(m-phenyleneisophthalamide) textile fabric having a dye diffusion promoting amount of N-octyl-2-pyrrolidone thereon;
- (b) applying onto the fabric a print paste consisting essentially of a tinctorial amount of at least one dyestuff, a print paste thickening agent, and water, in a predetermined pattern, and then
- (c) drying, then setting the print on the thus-treated fabric in saturated steam at about 100.degree. C.
A print paste for printing and dyeing poly(m-phenyleneisophthalamide) textile fabric in a predetermined pattern, the print paste consisting essentially, in percent by weight, of:
- about 1 part to about 50 parts of N-octyl-2-pyrrolidone as a diffusion promoter and swelling agent to introduce a compatible dyestuff into the poly(m-phenyleneisophthalamide) fibers;
- a tinctorial amount of at least one organic dyestuff soluble in an aqueous solution of N-octyl-2-pyrrolidone and capable of dyeing and fixing in the fibers;
- a print paste thickener soluble in an aqueous solution of N-octyl-2-pyrrolidone and compatible with the other ingredients of the print paste, the thickener present in an amount sufficient to provide printing viscosity;
- balance water.
A process of flame-retardant treating a poly(m-phenleneisophthalamide) fiber, yarn or textile fabric comprising the successive steps of:
- (a) supplying a poly(m-phenyleneisophthalamide) textile fabric having a dye-diffusion promoting amount of N-octyl-2-pyrrolidone thereon;
- (b) applying a flame-retarding amount of a flame retardant;
- and then
- (c) drying, then curing the thus-treated fabric at an elevated temperature of about 100.degree. C. to about 210.degree. C. and for a time sufficient to permeate and fix flame retardant inside the poly(m-phenyleneisophthalamide) fibers.
A process of printing and flame retarding a poly(m-phenyleneisophthalamide) fiber, yarn or textile fabric comprising the successive steps of:
- (a) pretreating textile fabric with a bath containing a mixture of N-octyl-2-pyrrolidone and a flame retardant;
- (b) dyeing the pretreated fabric in a dyebath at a temperature between about 100.degree. C. and 130.degree. C.;
- (c) printing the pretreated, dyed fabric with a printing paste containing a premetalized dye, an acid dye or both, and then
- (d) setting the print by steaming the textile in saturated steam at atmospheric pressure.
Dependencies are inferred from the claim text.