Fibers having improved color fastness and fibrous formed body constituted thereof

Abstract

A subject of the invention is to provide a fiber and a fibrous formed body, particularly, a nonwoven fabric all having an exceptional color fastness and high liquid absorption properties and high durable hydrophilic properties. This is attained by a fiber essentially based on at least one kind of thermoplastic resin, wherein a fiber treating agent containing component (A) to (D) described below is attached to the fiber, with specific ratio of each of component (A) to (D), wherein (A) is an alkyl phosphate metal salt in which the number of carbons of an alkyl group is less than 10; (B) is a trialkylglycine derivative; (C) is a hydroxycarboxylic acid; and (D) is an alkyl phosphate metal salt in which the number of carbons of alkyl group is in the range of 10 to 14.

1 . A fiber essentially based on at least one kind of thermoplastic resin, wherein a fiber treating agent containing component (A), component (B), component (C) and component (D) described below is attached to the fiber, a component ratio of each of component (A), component (B) and component (C) is in the range of 3% by mass or more to less than 10% by mass and a component ratio of component (D) is in the range of 40 to 60% by mass, based on an effective component in the fiber treating agent, and the component ratio (% by mass) of component (A) and the component ratio (% by mass) of component (C) satisfy a relationship: component (C)≦component (A);
 component (A): an alkyl phosphate metal salt in which the number of carbons of an alkyl group is less than 10; 
 component (B): a trialkylglycine derivative; 
 component (C): a hydroxycarboxylic acid; and 
 component (D): an alkyl phosphate metal salt in which the number of carbons of an alkyl group is in the range of 10 to 14. 
 
     
     
         2 . The fiber according to  claim 1 , wherein the fiber treating agent further contains component (E) described below in the range of 10 to 20% by mass and component (F) described below in the range of 15 to 25% by mass, in terms of the component ratio based on the effective component in the fiber treating agent;
 component (E): a polyoxyalkylene-modified silicone; and   component (F): an ester of an alkyleneoxide adduct of hydroxystearic acid glyceride with maleic acid, wherein the ester is a compound in which a hydroxyl group of the ester is blocked with monocarboxylic acid having 10 to 22 carbons.   
     
     
         3 . A fibrous formed body, constituted essentially of the fiber according to  claim 1 . 
     
     
         4 . The fibrous formed body according to  claim 3 , wherein the fibrous formed body is a nonwoven fabric. 
     
     
         5 . A fibrous formed body, constituted essentially of the fiber according to  claim 2 . 
     
     
         6 . The fibrous formed body according to  claim 5 , wherein the fibrous formed body is a nonwoven fabric.