Bicomponent spunbond nonwoven web

Abstract

Disclosed are nonwoven webs comprising a plurality of continuous spunbonded bicomponent fibers, wherein each of the plurality of bicomponent fibers comprises 75% by weight of poly(ethylene terephthalate) in a core and 25% by weight of poly(trimethylene terephthalate) in a sheath surrounding the core, wherein the amounts in % by weight are based on the total weight of the bicomponent fiber.

1 . A nonwoven web comprising a plurality of continuous spunbonded bicomponent fibers, wherein each of the plurality of bicomponent fibers comprises:
 a) 75% by weight of poly(ethylene terephthalate) in a core; and   b) 25% by weight of poly(trimethylene terephthalate) in a sheath surrounding the core.   wherein the amounts in % by weight are based on the total weight of the each of the plurality of bicomponent fibers.   
     
     
         2 . The nonwoven web of  claim 1 , wherein the bicomponent fibers have an average fiber diameter in the range of 2 microns to 20 microns. 
     
     
         3 . The nonwoven web of  claim 1 , wherein the nonwoven web has a basis weight in the range of 25 gsm to 500 gsm. 
     
     
         4 . The nonwoven web of  claim 3 , wherein the nonwoven web has a machine direction and a cross direction and a basis weight in the range of 50 gsm to 150 gsm. 
     
     
         5 . The nonwoven web of  claim 4 , wherein the nonwoven web has a tensile strength per unit basis weight in both the machine direction and the cross direction, measured according to ASTM D1117-01, D5035-95, in the range of 0.75 N/gsm to 5 N/gsm. 
     
     
         6 . The nonwoven web of  claim 4 , wherein the nonwoven web has a grab tear strength per unit basis weight in both the machine direction and the cross direction, measured according to ASTM D1117-01, D5035-95, in the range of 1.5 N/gsm to 10 N/gsm. 
     
     
         7 . The nonwoven web of  claim 4 , wherein the nonwoven web has a Mullen burst per unit basis weight in both the machine direction and the cross direction, measured according to ASTM D1117-01, D5035-95, in the range of 3.5 KPa/gsm to 10 KPa/gsm. 
     
     
         8 . The nonwoven web of  claim 4 , wherein the nonwoven web has a trapezoidal tear strength per unit basis weight in both the machine direction and the cross direction, measured according to ASTM 5733, in the range of 0.4 N/gsm to 5 N/gsm. 
     
     
         10 . The nonwoven web of  claim 1 , wherein the poly(trimethylene terephthalate) is made by polycondensation of 1,3-propanediol derived from a renewable source and terephthalic acid or acid equivalent. 
     
     
         11 . The nonwoven web of  claim 1 , wherein the poly(trimethylene terephthalate) contains at least 20% renewably sourced ingredient by weight. 
     
     
         12 . The nonwoven web of  claim 1 , wherein the nonwoven web has a renewably sourced content of at least 5% by total weight of the web. 
     
     
         13 . The nonwoven web of  claim 1 , wherein the poly(trimethylene terephthalate) comprises titanium dioxide. 
     
     
         14 . An article comprising the nonwoven web of  claim 1 . 
     
     
         15 . A nonwoven web comprising a plurality of continuous spunbonded bicomponent fibers, wherein each of the plurality of bicomponent fibers comprises:
 a) 50% by weight of poly(ethylene terephthalate) in a core; and   b) 50% by weight of poly(trimethylene terephthalate) in a sheath surrounding the core, wherein the amounts in % by weight are based on the total weight of the bicomponent fiber.