US 12,146,248 B2
Flame-retardant non-woven fibrous webs
Liyun Ren, Woodbury, MN (US); Daniel J. Zillig, Woodbury, MN (US); Sachin Talwar, Woodbury, MN (US); Eumi Pyun, St. Paul, MN (US); Jeffrey A. Chambers, St. Paul, MN (US); Nurkan Turkdogru Gurun, Indianapolis, MN (US); Pingfan Wu, Woodbury, MN (US); and Tien T. Wu, Woodbury, MN (US)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/261,661
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Oct. 15, 2019, PCT No. PCT/IB2019/058779
§ 371(c)(1), (2) Date Jan. 20, 2021,
PCT Pub. No. WO2020/079588, PCT Pub. Date Apr. 23, 2020.
Claims priority of provisional application 62/746,386, filed on Oct. 16, 2018.
Prior Publication US 2021/0292947 A1, Sep. 23, 2021
Int. Cl. D04H 1/56 (2006.01); D01F 1/07 (2006.01); D01F 6/84 (2006.01); D04H 3/16 (2006.01)
CPC D04H 1/56 (2013.01) [D01F 1/07 (2013.01); D01F 6/84 (2013.01); D04H 3/16 (2013.01); D10B 2401/041 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A non-woven fibrous web comprising:
a plurality of melt-blown fibers comprising a thermoplastic polymer blended with a polymeric phosphonate to provide a chemically-compatible polymeric blend characterized by a single uniform phase, the thermoplastic polymer comprising polyethylene terephthalate and the polymeric phosphonate being a polymeric phosphonate homopolymer containing one or more phenolic end groups and having a glass transition temperature of from 80° C. to 100° C., and
a plurality of secondary fibers having a median fiber diameter of from 10 micrometers to 50 micrometers, the secondary fibers comprised of polyphenylene sulfide,
wherein the nonwoven fibrous structure exhibits a Shrinkage of less than 15% after being heated to 150° C. for 60 minutes.