Pre-dyeing treatment process and dyeing process for textile products containing highly crosslinked polyacrylic fibers, pretreated and undyed textile product, and dyed textile product

A dyeing process for a textile product that comprises highly crosslinked polyacrylic fibers wherein the crosslinks comprise amido and carboxylic acid groups which have been linked by a hydrazine and another fiber, the process comprising:

• immersing the textile product in a water solution of an organic acid and exposing the immersed product to a high temperature and an elevated pressure;
• and
• preferentially dyeing the other, non-highly crosslinked polyacrylic fiber.

An undyed textile product comprising highly crosslinked polyacrylic fibers wherein the crosslinks comprise amido and carboxylic acid groups which have been linked by a hydrazine with another fiber, prepared by a pretreatment process comprising:

• immersing a textile product that comprises highly crosslinked polyacrylic fibers with another fiber into a water solution of an organic acid and exposing the immersed product to a high temperature and an elevated pressure;
• and
• then washing the product with water.

A dyed textile product comprising highly crosslinked polyacrylic fibers wherein the crosslinks comprise amido and carboxylic acid groups which have been linked by a hydrazine and another fiber blended therein, prepared by a preferential dye treatment method of:

• immersing a textile product that comprises said crosslinked polyacrylic fibers and another fiber blended therein in a water solution of an organic acid and exposing the immersed product to a high temperature and an elevated pressure;
• and thereafter dyeing the textile, wherein the fiber blended with the highly crosslinked polyacrylic fibers preferentially takes up dye.

A mixture of a textile product in a water solution of organic acid, the textile product comprising highly cross linked polyacrylic fibers wherein the cross links comprise amido and carboxylic acid groups linked by a hydrazine and wherein the organic acid is in a range to sufficiently titrate the carboxylic acid groups.