Resin composition

Abstract

Provided are a resin composition controlled such that after keeping under a severe environment as in high temperature hot water or in hot water under chemically severe condition, such as an acidic or basic condition, etc., for a fixed period of time, it is quickly decomposed; and a structure thereof.

What is claimed is: 
     
         1 . A resin composition containing a resin mainly derived from water-soluble monomers and having autocatalysis (component A) and a hydrolysis regulator (component B), the resin composition satisfying any one of the following A1 to A3:
 A1: In hot water at an arbitrary temperature of 135° C. to 160° C., after 3 hours, not only a resin composition-derived acidic group concentration is 30 equivalents/ton or less, but also a weight of a water-insoluble matter of the resin composition is 50% or more, and after 24 hours, the weight of the water-insoluble matter of the resin composition is 50% or less;   A2: In hot water at an arbitrary temperature of 160° C. to 180° C., after 2 hour, not only a resin composition-derived acidic group concentration is 30 equivalents/ton or less, but also a weight of a water-insoluble matter of the resin composition is 50% or more, and after 24 hours, the weight of the water-insoluble matter of the resin composition is 50% or less; and   A3: In hot water at an arbitrary temperature of 180° C. to 220° C., after 1 hour, not only a resin composition-derived acidic group concentration is 30 equivalents/ton or less, but also a weight of a water-insoluble matter of the resin composition is 50% or more, and after 24 hours, the weight of the water-insoluble matter of the resin composition is 50% or less;   wherein the component B has water resistance at 120° C. of 95% or more and reactivity with an acidic group at 190° C. of 50% or more; and   wherein the component B is bis(2,6-diisopropylphenyl)carbodiimide having a purity of 99.9% or more, and the compounds represented by the following formulae (4) and (5) are present in a total content of less than 0.1%:   
       
         
           
           
               
               
           
         
       
       wherein each of R 8  to R 11  is an aliphatic group having 3 carbon atoms, and at least one of them is a propyl group, with the other group or groups being an isopropyl group; 
       
         
           
           
               
               
           
         
       
       wherein each of R 12  to R 15  is an aliphatic group having 3 carbon atoms, and at least one group of them is substituted on a position other than the ortho position. 
     
     
         2 . The resin composition according to  claim 1 , wherein in hot water at an arbitrary temperature of 135° C. to 220° C., after 100 hours, the weight of the water-insoluble matter of the resin composition is 10% or less. 
     
     
         3 . The resin composition according to  claim 1 , wherein a heat deformation temperature of the resin composition is 135° C. to 300° C. 
     
     
         4 . The resin composition according to  claim 1 , wherein the component A is a polyester. 
     
     
         5 . The resin composition according to  claim 4 , wherein a main chain of the component A is composed mainly of a lactic acid unit represented by the following formula (1): 
       
         
           
           
               
               
           
         
       
     
     
         6 . The resin composition according to  claim 5 , wherein the component A contains a stereocomplex phase formed of poly(L-lactic acid) and poly(D-lactic acid). 
     
     
         7 . A molded article comprising the resin composition according to  claim 1 . 
     
     
         8 . A fiber comprising the resin composition according to  claim 1 . 
     
     
         9 . A resin composition including an aliphatic polyester mainly derived from water-soluble monomers (component C) and a hydrolysis regulator having reactivity with an acidic group in a 15% hydrochloric acid aqueous solution at 100° C. of 30% or more (component D), the resin composition satisfying any one of the following J1 to J2:
 J1: In the 15% hydrochloric acid aqueous solution at 100° C., after 6 hours, a weight average molecular weight retention rate of the resin composition is 50% or more, and after 24 hours, a weight of a water-insoluble matter of the resin composition is 50% or less; and 
 J2: In the 15% hydrochloric acid aqueous solution at 120° C., after 1 hour, a weight average molecular weight retention rate of the resin composition is 50% or more, and after 24 hours, a weight of a water-insoluble matter of the resin composition is 50% or less. 
 
     
     
         10 . The resin composition according to  claim 9 , wherein after 72 hours, the weight of the water-insoluble matter of the resin composition is 1% or less. 
     
     
         11 . The resin composition according to  claim 9 , wherein a main chain of the aliphatic polyester is composed mainly of a lactic acid unit represented by the following formula (1): 
       
         
           
           
               
               
           
         
       
     
     
         12 . The resin composition according to  claim 9 , wherein the hydrolysis regulator (component D) is at least one member selected from a carbodiimide compound and an epoxy compound. 
     
     
         13 . A molded article comprising the resin composition according to  claim 9 . 
     
     
         14 . The resin composition according to  claim 10 , wherein a main chain of the component A is composed mainly of a lactic acid unit represented by the following formula (1): 
       
         
           
           
               
               
           
         
       
     
     
         15 . The resin composition according to  claim 12 , wherein the hydrolysis regulator (component D) comprises an epoxy compound. 
     
     
         16 . The resin composition according to  claim 15 , wherein the epoxy compound is selected from the group consisting of alicyclic epoxy compounds, epoxidized vegetable oils obtained by epoxidizing a vegetable oil, and epoxy compounds having a glycidyl group. 
     
     
         17 . The resin composition according to  claim 15 , wherein the epoxy compound is selected from the group consisting of bifunctional and polyfunctional epoxy compounds. 
     
     
         18 . The resin composition according to  claim 15 , wherein the epoxy compound is selected from the group consisting of alicyclic epoxy compounds and diglycidyl ether compounds. 
     
     
         19 . The resin composition according to  claim 15 , wherein the epoxy compound is selected from the group consisting of 3,4-epoxycyclohexenylmethyl-3′,4′-epoxycyclohexene carboxylate, ε-caprolactone-modified 3,4-epoxycyclohexylmethyl-3′,4′-epoxycyclohexane carboxylate, epoxidized 3-cyclohexene-1,2-dicarboxylic acid bis(3-cyclohexenylmethyl)-modified ε-caprolactone, and epoxidized butanetetracarboxylic acid tetrakis-(3-cyclohexenylmethyl)-modified ε-caprolactone.