公开(公告)号：US20230233968A1

公开(公告)日：2023-07-27

申请号：US18011959

申请日：2021-06-30

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： HIMANSHU JASUJA ,  Nathan E. Schultz ,  Seth M. Kirk ,  Bryan L. Gerhardt ,  Daniel C. Duan ,  Michael R. Berrigan

IPC: B01D39/16 ,  B01D46/52 ,  B01D46/00

CPC classification number: B01D39/163 ,  B01D46/522 ,  B01D46/0001 ,  B01D2275/10 ,  B01D2239/0407 ,  B01D2239/0435 ,  B01D2239/0622 ,  B01D2239/0627 ,  B01D2239/0636 ,  B01D2239/0668 ,  B01D2239/1291 ,  B01D2239/1233 ,  B01D2279/50

Abstract: A pleated multilayer air filter assembly including a primary filtration layer and a prefilter layer that are bonded to each other and are co-pleated with each other. The primary filtration layer includes meltblown electret fibers. The prefilter layer includes meltspun, spunbonded electret fibers that comprise a radially outer surface comprising polymethylpentene. The ratio of Effective Fiber Diameter of the fibers of the primary filtration layer to Effective Fiber Diameter of the fibers of the primary filtration layer is at least 1.5.

公开(公告)号：US20230390678A1

公开(公告)日：2023-12-07

申请号：US18249989

申请日：2021-11-01

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Nathan E. Schultz ,  Zackary J. Becker ,  Daniel C. Duan ,  Himanshu Jasuja ,  Seth M. Kirk ,  Fuming B. Li ,  John M. Sebastian ,  Georgiy Teverovskiy

IPC: B01D39/16 ,  D01F8/06 ,  D01F8/16 ,  D04H1/4382 ,  D04H3/007

CPC classification number: B01D39/1623 ,  D01F8/06 ,  D01F8/16 ,  D04H1/43828 ,  D04H3/007 ,  A62B23/02

Abstract: Described herein is a thermoplastic core-sheath fiber. The thermoplastic core-sheath fiber comprises a core having a coextensive sheath layer disposed thereon, wherein the core comprises a first polymeric resin and an electrostatic charge enhancing additive, and the sheath layer comprising a second polymeric resin, with the proviso that if the second polymeric resin comprises poly(4-methyl-1-pentene), then the second polymeric resin does not comprise 100 wt % of poly(4-methyl-1-pentene). These thermoplastic core-sheath fibers can be used in filtering applications.

公开(公告)号：US20220323890A1

公开(公告)日：2022-10-13

申请号：US17622045

申请日：2020-06-12

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Nathan E. Schultz ,  Daniel C. Duan ,  Seth M. Kirk ,  Michael R. Berrigan ,  Zackary J. Becker ,  Fuming B. Li ,  John M. Sebastian

IPC: B01D39/16 ,  A62B23/02

Abstract: A filter assembly comprises an air filter medium and a prefilter medium. The prefilter medium comprises a second nonwoven fibrous web comprising poly(4-methylpentene) and an electrostatic charging additive and has a second electret charge. The filter assembly is configured such that air passing through the prefilter is directed through the air filter medium. A respirator includes the filter assembly. A prefilter assembly comprises a third nonwoven fibrous web retained by a prefilter frame. The third nonwoven fibrous web comprises: core-sheath fiber comprising a fiber core having a poly(4-methylpentene) sheath layer disposed thereon; and an electrostatic charging additive, wherein the electrostatic charging additive is contained in at least one of the fiber core or the sheath layer. The third nonwoven fibrous web has a third electret charge.

公开(公告)号：US20240009606A1

公开(公告)日：2024-01-11

申请号：US18252199

申请日：2021-11-29

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Kelly A. Volp ,  Nathan E. Schultz ,  Daniel C. Duan ,  Seth M. Kirk ,  Fuming B. Li ,  John M. Sebastian

IPC: B01D39/16 ,  C08K5/5399 ,  A62B23/02 ,  D04H3/007 ,  D04H3/16 ,  D06B1/02 ,  D06M10/02 ,  D06M11/05

CPC classification number: B01D39/1623 ,  C08K5/5399 ,  A62B23/025 ,  D04H3/007 ,  D04H3/16 ,  D06B1/02 ,  D06M10/025 ,  D06M11/05 ,  C08K2201/001 ,  C08K2201/019 ,  B01D2239/0435 ,  B01D2239/10 ,  B01D2239/0622 ,  B01D2239/0618 ,  D06M2101/20

Abstract: Described herein is the use of a cyclotriphosphazene core substituted with at least three amino-cyclic carbon groups used as a charge-enhancing additive in a thermoplastic resin. Such compositions may be used in filtering applications.

公开(公告)号：US20220372666A1

公开(公告)日：2022-11-24

申请号：US17621994

申请日：2020-06-24

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Nathan E. Schultz ,  Daniel C. Duan ,  Seth M. Kirk ,  Michael R. Berrigan ,  Zackary J. Becker ,  Fuming B. Li ,  John M. Sebastian

IPC: D01F8/06 ,  D01F8/14 ,  D01F8/10 ,  D01F1/10 ,  B01D39/16 ,  D01D5/34 ,  D04H1/4382 ,  D04H3/007 ,  D04H3/011 ,  D04H3/018 ,  D04H1/435 ,  D04H1/4291 ,  A62B23/02

Abstract: A thermoplastic core-sheath fiber comprises: a polymer fiber core having a coextensive sheath layer disposed thereon, and an electrostatic charge enhancing additive. The sheath layer may comprise poly(4-methyl-1-pentene) and the fiber core and the sheath layer have different compositions. At least one of the fiber core or the sheath layer comprises an electret charge. A nonwoven fibrous web comprising the core-sheath fibers and a respirator including the nonwoven fibrous web are also disclosed.