US2002127939A1PendingUtilityA1

Poly (trimethylene terephthalate) based meltblown nonwovens

33
Priority: Nov 6, 2000Filed: Oct 31, 2001Published: Sep 12, 2002
Est. expiryNov 6, 2020(expired)· nominal 20-yr term from priority
Inventors:Charles C. HwoHouston BrownDong ZhangChristine Sun
Y10T442/60D01D 5/0985D04H 1/56Y10T428/2931Y10T442/622D01F 8/14Y10T442/638D01F 6/62Y10T442/614
33
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Claims

Abstract

This invention is a bicomponent meltblown microfiber nonwoven material wherein at least two different polymers have been extruded and spun together in either a side by side or core/sheath configuration and wherein at least one of the polymers is polytrimethylene terephthalate (PTT) and at least one of the polymers is one of but not limited to the following thermoplastics: polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide (PA), and polylactide (PLA). The ratio of PTT to the other component ranges from 1:99 to 99:1, based on the weight of the polymers. The preferred weight ratio range of PTT:PP is 25:75 to 75:25 and the most preferred range is 25:75 to 50:50. The present invention also provides a process for making such a bicomponent fiber. The present invention also provides a process for making such a meltblown microfiber nonwoven material.

Claims

exact text as granted — not AI-modified
We claim:  
     
         1 . A bicomponent meltblown microfiber nonwoven material which is comprised of at least two different polymers which have been extruded and spun together in a side by side configuration and wherein at least one of the polymers is polytrimethylene terephthalate.  
     
     
         2 . The material of  claim 1  wherein the weight ratio of polytrimethylene terephthalate to the other polymer(s) ranges from 1:99 to 99:1.  
     
     
         3 . The material of  claim 2  wherein the weight ratio of polytrimethylene terephthalate to the other polymer(s) ranges from 25:75 to 75:25.  
     
     
         4 . The material of  claim 4  where the weight ratio ranges from 25:75 to 50:50.  
     
     
         5 . The material of  claim 1  wherein 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).  
     
     
         6 . A bicomponent meltblown microfiber nonwoven material which is comprised of at least two different polymers which have been extruded and spun together in a core/sheath configuration and wherein at least one of the polymers is polytrimethylene terephthalate.  
     
     
         7 . The material of  claim 6  wherein the weight ratio of polytrimethylene terephthalate to the other polymer(s) ranges from 1:99 to 99:1.  
     
     
         8 . The material of  claim 7  wherein the weight ratio of polytrimethylene terephthalate to the other polymer(s) ranges from 25:75 to 75:25.  
     
     
         9 . The material of  claim 8  where the weight ratio ranges from 25:75 to 50:50.  
     
     
         10 . The material of  claim 6  wherein 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).  
     
     
         11 . A process for making bicomponent fibers which comprises extruding at least two different polymers and spinning them together in a side by side configuration wherein at least one of the polymers is polytrimethylene terephthalate.  
     
     
         12 . The process of  claim 11  wherein 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).  
     
     
         13 . The process of  claim 11  wherein the weight ratio of polytrimethylene terephthalate to the other polymer(s) ranges from 1:99 to 99:1.  
     
     
         14 . The process of  claim 13  wherein the weight ratio of polytrimethylene terephthalate to the other polymer(s) preferably ranges from 25:75 to 75:25.  
     
     
         15 . The process of  claim 14  wherein the weight ratio of polytrimethylene terephthalate to the other polymer ranges from 25:75 to 50:50.  
     
     
         16 . A process for making bicomponent fibers which comprises extruding at least two different polymers and spinning them together in a core/sheath configuration wherein at least one of the polymers is polytrimethylene terephthalate.  
     
     
         17 . The process of  claim 16  wherein 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).  
     
     
         18 . The process of  claim 16  wherein the weight ratio of polytrimethylene terephthalate to the other polymer(s) ranges from 1:99 to 99:1.  
     
     
         19 . The process of  claim 18  wherein the weight ratio of polytrimethylene terephthalate to the other polymer(s) ranges from 25:75 to 75:25.  
     
     
         20 . The process of  claim 19  wherein the weight ratio is 25:75 to 50:50.  
     
     
         21 . A process for making a bicomponent microfiber nonwoven material which comprises meltblowing a bicomponent fiber, wherein one of the components is polytrimethylene terephthalate.  
     
     
         22 . The process of  claim 21  wherein 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).  
     
     
         23 . The process of  claim 21  wherein the weight ratio of polytrimethylene terephthalate to the other component(s) ranges from 1:99 to 99:1.  
     
     
         24 . The process of  claim 23  wherein the weight ratio of polytrimethylene terephthalate to the other component (s) ranges from 25:75 to 75:25.  
     
     
         25 . The process of  claim 24  wherein the weight ratio is 25:75 to 50:50.  
     
     
         26 . A monocomponent meltblown microfiber nonwoven material made from polytrimethylene terephthalate.  
     
     
         27 . The material of  claim 1  wherein the other polymer(s) is polypropylene.  
     
     
         28 . The material of  claim 6  wherein the other polymer(s) is polypropylene.  
     
     
         29 . The material of  claim 11  wherein the other polymer(s) is polypropylene.  
     
     
         30 . The process of  claim 16  wherein the other polymer(s) is polypropylene.  
     
     
         31 . The process of  claim 21  wherein the other polymer(s) is polypropylene.

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