Normal pressure dyeable polyester fiber and method for producing the same

Abstract

Disclosed is a fiber made of a polyester resin, wherein the polyester resin is a copolymer including a dicarboxylic acid component and a glycol component; of the dicarboxylic acid component, 80 mol % or more is accounted for by a terephthalic acid component, 4.0 to 12.0 mol % is accounted for by a cyclohexane dicarboxylic acid component, and 2.0 to 8.0 mol % is accounted for by an adipic acid component; and the glycol component contains an ethylene glycol component as a main component thereof. A polyester fiber is thereby provided which can be dyed with excellent deep color property and fastness property in dyeing under a normal pressure environment and which can offer stable quality and processing performance also by a direct spinning stretching method or other general melt-spinning methods.

1 - 6 . (canceled) 
     
     
         7 . A method for producing a fiber comprising a polyester resin, wherein the polyester resin is a copolymer comprising:
 a dicarboxylic acid component comprising 80 mol % or more of a terephthalic acid component, 4.0 to 12.0 mol % of a cyclohexane dicarboxylic acid component, and 3.0 to 8.0 mol % of an adipic acid component; and a glycol component comprising, as a main component, an ethylene glycol component,   wherein the polyester resin has a glass transition temperature (Tg) satisfying (a):
 (a) glass transition temperature (Tg): 61° C.≦Tg≦72° C. said method comprising, in the following order: 
   (1) melt-spinning a polyester resin through a spinneret, to obtain a melt-spun thread;   (2) cooling the melt-spun thread to a glass transition temperature of the melt-spun thread or lower, thereby obtaining a cooled thread;   (3) running the cooled thread within a tube heating apparatus, thereby obtaining a heat-stretched thread,   (4) contacting the heat-stretched thread with an oil, to obtain an oiled thread; and   (5) winding the oiled thread at a rate of 3500 to 5500 m/minute.   
     
     
         8 . The method of  claim 7 , wherein the polyester resin has a glass transition temperature (Tg) and a crystallization temperature (Tch) satisfying (b) and (c):
 (b) crystallization temperature (Tch): 120° C.≦Tch≦150° C.; and   (c) ΔT (Tch−Tg): 50° C.≦ΔT (Tch−Tg)≦80° C.   
     
     
         9 . The method of  claim 7 , wherein said fiber satisfies (d) to (f):
 (d) a degree of exhaustion at 95°C. is 70% or more and a degree of exhaustion at 100° C. is 90% or more;   (e) a color fastness to washing in dyeing at 100° C. of discoloration, that of attachment staining, and that of liquid staining are respectively grade 4 or higher; and   (f) a color fastness to light in dyeing at 100° C. is grade 4 or higher.   
     
     
         10 . The method of  claim 7 , wherein said fiber has a retention of strength at break after a 15% alkali weight loss treatment of 90% or higher. 
     
     
         11 . The method of  claim 7 , wherein the dicarboxylic acid component comprises from 5.0 to 10.0 mol % of the cyclohexanedicarboxylic acid component. 
     
     
         12 . The method of  claim 11 , wherein the dicarboxylic acid component comprises from 3.0 to 6.0 mol % of the adipic acid component. 
     
     
         13 . The method of  claim 7 , wherein the dicarboxylic acid component com rises from 3.0 to 6.0 mol % of the adipic acid component. 
     
     
         14 . The method of  claim 7 , wherein the cyclohexanedicarboxylic acid component comprises at least one selected from the group consisting of 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid. 
     
     
         15 . The method of  claim 7 , wherein the dicarboxylic acid component further comprises up to 10 mol % of at least one aromatic dicarboxylic acid component selected from the group consisting of an isophthalic acid component and a naphthalene dicarboxylic acid component. 
     
     
         16 . The method of  claim 15 , wherein the aromatic dicarboxylic acid component comprises 5 mol % or less of the isophthalic acid component. 
     
     
         17 . The method of  claim 7 , wherein the dicarboxylic acid component further comprises up to 10 mol % of at least one aliphatic dicarboxylic acid component selected from the group consisting of an azelaic acid component and a sebacic acid component. 
     
     
         18 . The method of  claim 7 , wherein the polyester resin has an intrinsic viscosity of 0.6 to 0.7. 
     
     
         19 . The method of  claim 7 , wherein the polyester resin has an intrinsic viscosity of 0.62 to 0.68. 
     
     
         20 . The method of  claim 7 , wherein the polyester resin has an intrinsic viscosity of 0.63 to 0.66. 
     
     
         21 . A method for dyeing a fiber, the method comprising:
 dyeing the fiber, with a disperse dye under normal pressure at 95 to 100° C.   wherein said fiber comprises a polyester resin wherein said polyester resin is a copolymer comprising:   a dicarboxylic acid component comprising 80 mol % or more of a terephthalic acid component, 4.0 to 12.0 mol % of a cyclohexane dicarboxylic acid component, and 3.0 to 8.0 mol % of an adipic acid component; and a glycol component comprising, as a main component, an ethylene glycol component,   wherein the polyester resin has a glass transition temperature (Tg) satisfying (a):   (a) glass transition temperature (Tg): 61° C.≦Tg≦72″C.   
     
     
         22 . The method of  claim 21 , wherein the polyester resin has a glass transition temperature (Tg) and a crystallization temperature (Tch) satisfying (b) and (c):
 (b) crystallization temperature (Tch): 120° C.≦Tch≦150° C.; and   (c) ΔT (Tch−Tg): 50° C.≦ΔT (Tch−Tg)≦80° C.   
     
     
         23 . The method of  claim 21 , wherein said fiber satisfies (d) to (f):
 (d) a degree of exhaustion at 95° C. is 70% or more and a degree of exhaustion at 100° C. is 90% or more;   (e) a color fastness to washing in dyeing at 100° C. of discoloration, that of attachment staining, and that of liquid staining are respectively grade 4 or higher; and   (f) a color fastness to light in dyeing at 100° C. is grade 4 or higher.   
     
     
         24 . The method of  claim 21 , wherein said fiber has a retention of strength at break after a 15% alkali weight loss treatment of 90% or higher. 
     
     
         25 . The method of  claim 21 , wherein the dicarboxylic acid component comprises from 5.0 to 10.0 mol % of the cyclohexanedicarboxylic acid component. 
     
     
         26 . The method of  claim 25 , wherein the dicarboxylic acid component comprises from 3.0 to 6.0 mol % of the adipic acid component. 
     
     
         27 . The method of  claim 21 , wherein the dicarboxylic acid component comprises from 3.0 to 6.0 mol % of the adipic acid component. 
     
     
         28 . The method of  claim 21 , wherein the cyclohexanedicarboxylic acid component comprises at least one selected from the group consisting of 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarboxylic acid. 
     
     
         29 . The method of  claim 21 , wherein the dicarboxylic acid component further comprises up to 10 mol % of at least one aromatic dicarboxylic acid component selected from the group consisting of an isophthalic acid component and a naphthalene dicarboxylic acid component. 
     
     
         30 . The method of  claim 29 , wherein the aromatic dicarboxylic acid component comprises 5 mol % or less of the isophthalic acid component. 
     
     
         31 . The method of  claim 21 , wherein the dicarboxylic acid component further comprises up to 10 mol % of at least one aliphatic dicarboxylic acid component selected from the group consisting of an azelaic acid component and a sebacic acid component. 
     
     
         32 . The method of  claim 21 , wherein the polyester resin has an intrinsic viscosity of 0.6 to 0.7. 
     
     
         33 . The method of  claim 21 , wherein the polyester resin has an intrinsic viscosity of 0.62 to 0.68. 
     
     
         34 . The method of  claim 21 , wherein the polyester resin has an intrinsic viscosity of 0.63 to 0.66.