Spunbonded Nonwoven Fabrics

Abstract

The present invention proposes a spunbonded nonwoven fabric which has an excellent low modulus, retains a high elongating property, and has particularly excellent moldability and followability, and also has excellent dimensional stability after molding, and suitable for a backing ground fabric of automobile interior materials. The present invention pertains to (A) a spunbonded nonwoven fabric consisting of continuous fibers containing aromatic polyester (melting point: Tm1) and aromatic copolyester (a melting point: Tm2=150 degrees centigrade to (Tm1-20 degrees centigrade)) in an amount of 1 to 15% by weight with respect to the aromatic polyester, wherein the elongation rate of the nonwoven fabric is 20% or more and 100% or less, and the load of elongation of 5% is 1.2 N/50 mm or less per g/m 2 weight, (B) the spunbonded nonwoven fabric according to the above (A), wherein the aromatic polyester is polybutylene terephthalate, and (C) the spunbonded nonwoven fabric according to the above (A) or (B), wherein the starting temperature of endotherm of an endothermic peak representing the melting point in a temperature raising process of a differential scanning calorimeter is 140 degrees centigrade or higher.

1 . A spunbonded nonwoven fabric comprising continuous fibers containing aromatic polyester (melting point: Tm1) and aromatic copolyester (melting point: Tm2=150 degrees centigrade to (Tm1-20) degrees centigrade) in an amount of 1 to 15% by weight with respect to the aromatic polyester, wherein an elongation rate of the nonwoven fabric is 20% or more and 100% or less, and the load of elongation of 5% is 1.2 N/50 mm or less per g/m 2  weight. 
   
   
       2 . The spunbonded nonwoven fabric according to  claim 1 , wherein the melting point of an endothermic peak representing the melting point in a temperature raising process of a differential scanning calorimeter is 140 degrees centigrade or higher. 
   
   
       3 . A spunbonded nonwoven fabric comprising continuous fibers, which contains an aromatic polyester unit in an amount of 80% by mol or more, and in which the starting temperature of endotherm of an endothermic peak representing the melting point in a temperature raising process of a differential scanning calorimeter is 160 degrees centigrade to 260 degrees centigrade, wherein the elongation rate of the nonwoven fabric is 40% or more and 100% or less when the nonwoven fabric is heated to 120 degrees centigrade, and the load of elongation of 5% is 0.2 N/50 mm or less per g/m 2  weight. 
   
   
       4 . The spunbonded nonwoven fabric according to  claim 1 , wherein aromatic polyester is polybutylene terephthalate or polytrimethylene terephthalate. 
   
   
       5 . The spunbonded nonwoven fabric according to  claim 1  having a laminated structure in which the respective layers have different densities from each other. 
   
   
       6 . The spunbonded nonwoven fabric according to  claim 2 , wherein aromatic polyester is polybutylene terephthalate or polytrimethylene terephthalate. 
   
   
       7 . The spunbonded nonwoven fabric according to  claim 2  having a laminated structure in which the respective layers have different densities from each other. 
   
   
       8 . The spunbonded nonwoven fabric according to  claim 3 , wherein aromatic polyester is polybutylene terephthalate or polytrimethylene terephthalate. 
   
   
       9 . The spunbonded nonwoven fabric according to  claim 3  having a laminated structure in which the respective layers have different densities from each other. 
   
   
       10 . The spunbonded nonwoven fabric according to  claim 4  having a laminated structure in which the respective layers have different densities from each other.