Thermally stable nonwoven web comprising meltblown blended-polymer fibers

Patent metadata

Field	Value
Publication number	US-10619275-B2
Application number	US-201415318613-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jun 26, 2014
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A thermally stable nonwoven web including blended-polymer meltblown fibers containing a blend of poly (butylene terephthalate) and poly (ethylene terephthalate).

First claim

What is claimed is:

1. A thermally stable nonwoven web, comprising:
meltblown fibers,
wherein at least selected meltblown fibers are blended-polymer fibers each comprising a blend of poly(butylene terephthalate) (PBT) and poly(ethylene terephthalate) (PET), wherein the PET is substantially free of non-polymeric nucleating agent and wherein the meltblown fibers exhibit an average weight ratio of PBT to PET of from about 80:20 to about 30:70;

and,
staple fibers,
wherein the staple fibers make up from about 10 wt. % to about 60 wt. % of the total weight of the fibrous material of the web;
and wherein the thermally stable nonwoven web exhibits a thermal shrink of less than about 10%.

2. The web of claim 1 , wherein the meltblown fibers exhibit an average weight ratio of PBT to PET of from about 70:30 to about 35:65.

3. The web of claim 1 , wherein the meltblown fibers collectively exhibit an average fiber diameter of less than about 10 micrometers.

4. The web of claim 1 , wherein the staple fibers make up from about 20 wt. % to about 60 wt. % of the total weight of the fibrous material of the web.

5. The web of claim 1 , wherein the staple fibers make up from about 30 wt. % to about 60 wt. % of the total weight of the fibrous material of the web.

6. The web of claim 1 , wherein the staple fibers make up from about 40 wt. % to about 60 wt. % of the total weight of the fibrous material of the web.

7. The web of claim 1 , wherein the staple fibers are PET fibers.

8. The web of claim 1 , wherein the web exhibits a thermal shrink of less than about 6%.

9. The web of claim 1 , wherein the web exhibits a thermal shrink of less than about 4%.

10. The web of claim 1 , wherein the web exhibits a thermal shrink of less than about 2%.

11. The web of claim 1 , wherein the meltblown fibers collectively comprise no more than about 5 wt. % of any polymeric material that exhibits a T m of less than 200° C.

12. The web of claim 1 , wherein the meltblown fibers are substantially free of any polymeric material with a T m of less than 200° C.

13. An article comprising the thermally stable nonwoven web of claim 1 , wherein the article is selected from the group consisting of a thermal insulation article, an acoustic insulation article, a fluid filtration article, or a combination thereof.

14. The article of claim 13 , wherein the article is an acoustic insulation article that exhibits a thermal shrink of less than about 5%.

Assignees

• 3M Innovative Properties Co
• Chen Rui

Inventors

• Chen Rui
• Fu Xiaoshuan
• You Jin Zhang
• Hanamaki Chiaki
• Talwar Sachin

Classifications

• D04H5/06 Primary

  strengthened or consolidated by welding-together thermoplastic fibres, filaments, or yarns · CPC title

• D01F6/92

  of polyesters · CPC title

• D04H1/435

  Polyesters · CPC title

• D04H1/56

  in association with fibre formation, e.g. immediately following extrusion of staple fibres · CPC title

• D01D5/0985

  by means of a flowing gas (e.g. melt-blowing) · CPC title