Poly (trimethylene terephthalate) based spunbonded nonwovens

Abstract

This invention is a spunbonded nonwoven material which is formed of polytrimethylene terephthalate (PTT). This material may be a microfiber material which is 1 dpf or less in fiber diameter. This nonwoven material is unique in that it has a hydrostatic head of no more than 10 cm, preferably no more than 5 cm.

We claim:  
     
         1 . A spunbonded nonwoven material with a hydrostatic head of no more than 10 cm which is comprised of polytrimethylene terephthalate.  
     
     
         2 . The material of  claim 1  wherein the hydrostatic head is no more than 5 cm.  
     
     
         3 . The material of  claim 1  wherein the liquid strike-through is no more than 25 seconds.  
     
     
         4 . The material of  claim 3  wherein wherein the liquid strike-through is no more than 15 seconds.  
     
     
         5 . The material of  claim 4  wherein the liquid strike-through is no more than is 10 seconds.  
     
     
         6 . The material of  claim 5  wherein the liquid strike-through is no more than 7 seconds.  
     
     
         7 . The material of  claim 1  wherein the web is a bicomponent web which is comprised of at least two different polymers and the other polymer(s) is (are) selected from the group consisting of polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide (PA), and polylactide (PLA).  
     
     
         8 . The bicomponent spunbonded nonwoven material of  claim 7  wherein the polymers have been extruded and spun together in a core/sheath configuration.  
     
     
         9 . The bicomponent spunbonded nonwoven material of  claim 7  wherein the polymers have been extruded and spun together in a side by side configuration.