Biodegradable three-dimensional network structure

Abstract

An object of the present invention is to provide a biodegradable three-dimensional network structure having excellent compression durability and high compression recovery after heat compression. The biodegradable three-dimensional network structure includes a linear fiber including a polybutylene adipate terephthalate resin having a weight average molecular weight of 35000 or more, wherein the biodegradable three-dimensional network structure has an apparent density of from 0.005 g/cm3 to 0.30 g/cm3 and a thickness of from 10 mm to 100 mm, and the linear fiber has a fiber diameter of from 0.2 mm to 2.0 mm and a crystalline melting enthalpy of 16 J/g or more.

1 . A biodegradable three-dimensional network structure comprising a linear fiber comprising a polybutylene adipate terephthalate resin having a weight average molecular weight of 35000 or more,
 wherein the biodegradable three-dimensional network structure has an apparent density of from 0.005 g/cm3 to 0.30 g/cm3 and a thickness of from 10 mm to 100 mm, and   the linear fiber has a fiber diameter of from 0.2 mm to 2.0 mm and a crystalline melting enthalpy of 16 J/g or more.   
     
     
         2 . The biodegradable three-dimensional network structure according to  claim 1 , wherein the linear fiber has a three-dimensional random looped shape. 
     
     
         3 . The biodegradable three-dimensional network structure according to  claim 1 , wherein the linear fiber has a crystalline melting enthalpy of 30 J/g or less. 
     
     
         4 . The biodegradable three-dimensional network structure according to  claim 1 , wherein the biodegradable three-dimensional network structure has an applicability to a cushion. 
     
     
         5 . The biodegradable three-dimensional network structure according to  claim 1 , wherein the polybutylene adipate terephthalate resin has a weight average molecular weight of 150000 or less. 
     
     
         6 . The biodegradable three-dimensional network structure according to  claim 1 , wherein the linear fiber has a melting point of 100° C. or higher and 120° C. or lower. 
     
     
         7 . The biodegradable three-dimensional network structure according to  claim 1 , wherein the linear fiber has a hollow cross-sectional shape. 
     
     
         8 . The biodegradable three-dimensional network structure according to  claim 7 , wherein the linear fiber has a hollow rate of 1% or more and 30% or less.