Highly shrinkable acrylic fiber, pile compositions containing the same and napped fabrics made by using the compositions
View Patent ↗There is disclosed a high-shrinkage acrylic fiber made of an acrylonitrile polymer comprising acrylonitrile in no less than 50% by weight, wherein a shrinkage rare after dry heating at 130° C. for 10 min without load is 25 to 35% and a difference between the maximum and the minimum of a shrinkage rate after dry heating within a temperature range of 120 to 140° C. for 10 min without load is 8% or less. There also provided a pile composition comprising the high-shrinkage acrylic in 20 to 80% by weight, and a pile fabric prepared from the pile composition.
1. A high-shrinkage acrylic fiber made of an acrylonitrile polymer comprising an acrylonitrile unit in 50% by weight or more, wherein a shrinkage rate of the fiber under dry heating condition at 130° C. for 10 min without load is 25 to 35% and a difference between the maximum and the minimum of a shrinkage rate under dry heating condition within a temperature range of 120 to 140° C. for 10 min without load is 8% or less.
2. The high-shrinkage acrylic fiber as claimed in claim 1 wherein an interfiber coefficient of static friction μs is 0.4 or less; an interfiber coefficient of dynamic friction μd is 0.30 or less; and Δμ, a difference between the coefficient of static friction μs and the coefficient of dynamic friction μd, is 0.01 to 0.2.
3. The high-shrinkage acrylic fiber as claimed in claim 1 , wherein a number of crimps N/inch of a monofilament is 5 to 12; its degree of crimp D (%) is 7 or higher; and a product of N×D is 50 or larger.
4. The high-shrinkage acrylic fiber as claimed in claim 1 , wherein the acrylonitrile polymer is a single polymer or a mixture of two or more polymers with different acrylonitrile content.
5. The high-shrinkage acrylic fiber as claimed in claim 2 , wherein the acrylonitrile polymer is a single polymer or a mixture of two or more polymers with a different acrylonitrile content.
6. The high-shrinkage acrylic fiber as claimed in claim 3 , wherein the acrylonitrile polymer is a single polymer or a mixture of two or more polymers with a different acrylonitrile content.
7. The high-shrinkage acrylic fiber as claimed in claim 4 , wherein an acrylonitrile content of the acrylonitrile polymer is 80% by weight or higher.
8. The high-shrinkage acrylic fiber as claimed in claim 5 , wherein an acrylonitrile content of the acrylonitrile polymer is 80% by weight or higher.
9. The high-shrinkage acrylic fiber as claimed in claim 6 , wherein an acrylonitrile content of the acrylonitrile polymer is 80% by weight or higher.
10. The high-shrinkage acrylic fiber as claimed in claim 1 , wherein the acrylonitrile polymer is prepared by copolymerization of acrylonitrile with a monomer copolymerizable with acrylonitrile; and the copolymerizable monomer is selected from the group consisting of acrylic acid, methacrylic acid and their alkyl esters, vinyl acetate, acryl amide, 2-hydroxylethyl methacrylate, 2-hydroxylethyl acrylate, glycidyl acrylate, glycidyl methacrylate, sodium allylsulfonate, sodium styrenesulfonate, vinyl chloride and vinylidene chloride.
11. A pile composition comprising the high-shrinkage acrylic fiber as claimed in claim 1 in an amount of 20 to 90% by weight.
12. A pile composition comprising the high-shrinkage acrylic fiber as claimed in claim 2 in an amount of 20 to 90% by weight.
13. A pile composition comprising the high-shrinkage acrylic fiber as claimed in claim 3 in an amount of 20 to 90% by weight.
14. The pile composition as claimed in claim 11 , further comprising a low shrinkable acrylic fiber whose shrinkage rate after dry heating at 130° C. for 10 min without load is 5% or less in an amount of 80 to 10% by weight.
15. The pile composition as claimed in claim 12 , further comprising a low shrinkable acrylic fiber whose shrinkage rate after dry heating at 130° C. for 10 min without load is 5% or less in an amount of 80 to 10% by weight.
16. The pile composition as claimed in claim 13 , further comprising a low shrinkable acrylic fiber whose shrinkage rate after dry heating at 130° C. for 10 min without load is 5% or less in an amount of 80 to 10% by weight.
17. A pile fabric prepared from the pile composition as claimed in claim 11 .
18. A pile fabric prepared from the pile composition as claimed in claim 12 .
19. A pile fabric prepared from the pile composition as claimed in claim 13 .
20. A pile fabric prepared from the pile composition as claimed in claim 14 .
21. A pile fabric prepared from the pile composition as claimed in claim 15 .
22. A pile fabric prepared from the pile composition as claimed in claim 16 .