Polyethylene terephthalate fiber for air-bags and textiles made from same

Abstract

A polyethylene terephthalate multifilament prepared by spinning polyethylene terephthalate chips having an intrinsic viscosity of 0.8 to 1.3 is provided. In order to improve the energy absorption capability of a textile for polyethylene terephthalate air bags, a textile for air bag having an improved rupture property at a welt portion in an air bag cushion deployment test can be prepared using a polyethylene terephthalate fiber by adjusting a strength/deformation curve of the polyethylene terephthalate fiber. Here, the polyethylene terephthalate fiber has a strength/deformation curve in which the polyethylene terephthalate fiber extends by less than 4% when subjected to an initial stress of 1.0 g/d at room temperature, extends by less than 12% subjected to a medium stress of 4.5 g/d and extends by 3% or more until fibers are cut at a tensile strength of at least 7.0 g/d, and has an elongation at break of 15% or more, a carboxyl end group (CEG) content of 35 mmol/kg or less, and a single fiber thickness of 5 deniers or less.

1 . A polyethylene terephthalate multifilament for air bags made by spinning polyethylene terephthalate chips having an intrinsic viscosity (IV) of 0.8 to 1.3,
 wherein the polyethylene terephthalate multifilament has a strength/deformation curve in which the polyethylene terephthalate multifilament extends by less than 4% when subjected to an initial stress of 1.0 g/d at room temperature, extends by less than 12% when subjected to a medium stress of 4.5 g/d and extends by 3% or more until fibers are cut at a tensile strength of at least 7.0 g/d, and has an elongation at break of 15% or more and a single fiber thickness of 5 deniers or less.   
     
     
         2 . The polyethylene terephthalate multifilament for air bags according to  claim 1 , wherein the polyethylene terephthalate multifilament has a value of 1.5 or more, in case which is calculated by dividing an F/F coefficient of kinetic friction of a yarn by an F/M coefficient of kinetic friction of the yarn. 
     
     
         3 . The polyethylene terephthalate multifilament for air bags according to  claim 1 , wherein the polyethylene terephthalate multifilament has a carboxyl end group (CEG) content of 35 mmol/kg or less. 
     
     
         4 . The polyethylene terephthalate multifilament for air bags according to  claim 1 , wherein the polyethylene terephthalate multifilament has a maximum thermal stress of 0.2 to 0.5 g/d. 
     
     
         5 . The polyethylene terephthalate multifilament for air bags according to  claim 1 , wherein the polyethylene terephthalate multifilament has a total fiber thickness of 150 to 1,000 deniers. 
     
     
         6 . A textile for air bags woven from the polyethylene terephthalate multifilament defined in  claim 1 . 
     
     
         7 . A coated textile for air bags which is prepared by coating the textile for air bags defined in  claim 6  with a coating agent selected from the group consisting of a silicon-based coating agent, a polyurethane-based coating agent, an acrylic coating agent, a neoprene-based coating agent and a chloroprene-based coating agent at a content of 15 to 60 g/m 2 , and has the following physical properties:
 (1) Tensile strength: 190 to 300 kgf, (2) Tear strength: 25 to 40 kgf, and (3) Air permeability: 0.5 cubic feet per minute (CFM) or less.