Sintered polymeric materials and applications thereof

• US 8,141,717 B2
• Filed: 08/20/2007
• Issued: 03/27/2012
• Est. Priority Date: 08/18/2006
• Status: Active Grant

• Current Assignee: Porex Corporation (FGI Equity LLC)
• Original Assignee: Porex Corporation (FGI Equity LLC)
• Inventors: Witover, Michael E., Wingo, James P., Reed, Deborah B., Tan, Take Huat, Haldopoulos, Ike Iaokim, Fullerton, Daniel George, Kunth, Gerald, Maertens, Andre, Mao, Guoqiang
• Primary Examiner(s): Menon, Krishnan S
• Application Number:
  US11/894,066
• Publication Number:
  US 20080197065A1
• Time in Patent Office: 1,681 Days
• Field of Search: None
• US Class Current: 210/510.1
• CPC Class Codes: B01D 39/1661 sintered or bonded
• CPC Class Codes: B01L 2300/0681 Filter
• CPC Class Codes: B01L 2300/069 Absorbents; Gels to retain a fluid
• CPC Class Codes: B01L 3/0275 Interchangeable or disposable dispensing tips

Abstract

The present invention provides sintered polymeric materials and methods of making the same which are useful in a variety of applications. In one embodiment, the present invention provides a sintered polymeric material comprising at least one plastic and at least one elastomer.

Claims

1. A composition comprising:

a sintered porous polymeric material comprising a sintered mixture of particles of at least one plastic and particles of at least one thermoplastic elastomer, the sintered porous polymeric material having a porosity ranging from 20% to 80% and a rigidity of less than 5 pounds,

wherein the at least one plastic is selected from the group consisting of polyethylene, polypropylene, polyesters, polycarbonates, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfones, polystyrenes, polyether imides, polyetheretherketones, and polysulfones and combinations thereof, and wherein the at least one thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethanes, polyisobutylene, polybutenes, polyethylene-propylene copolymer, polyethylene-butene copolymer, polyethylene-octene copolymer, polyethylene-hexene copolymer, chlorinated polyethylene, chloro-sulfonated polyethylene, styrene-ethylene-butadiene-styrene and 1,3-dienes and combinations thereof.

2. The composition of claim 1, wherein the 1,3-dienes comprise styrene-1,3-butadiene, carboxylated styrene-1,3-butadiene, acrylonitrile-1,3-butadiene, or isobutylene-isoprene or combinations thereof.

3. The composition of claim 1, wherein polyethylene comprises high density polyethylene or ultrahigh molecular weight polyethylene.

4. The composition of claim 1, wherein the particles of the at least one thermoplastic elastomer are present in an amount ranging from about 10 weight percent to about 90 weight percent.

5. The composition of claim 1, wherein the sintered porous polymeric material has an average pore size ranging from about 1 μ

m to about 200 μ

m.

6. The composition of claim 1, wherein the composition is an applicator, a filtration medium, or a barrier medium.

7. The composition of claim 1, further comprising at least one super-absorbent material.

8. A composition comprising:

a continuous sintered porous polymeric material comprising a flexible region and a rigid region, the flexible region comprising a sintered mixture of particles of a first plastic and particles of at least one thermoplastic elastomer, and the rigid region comprising sintered particles of a second plastic,

wherein the first plastic and the second plastic are independently selected from the group consisting of polyethylene, polypropylene, polyesters, polycarbonates, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfones, polystyrenes, polyether imides, polyetheretherketones, and polysulfones and combinations thereof, and wherein the at least one thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethanes, polyisobutylene, polybutenes, polyethylene-propylene copolymer, polyethylene-butene copolymer, polyethylene-octene copolymer, polyethylene-hexene copolymer, chlorinated polyethylene, chloro-sulfonated polyethylene, styrene-ethylene-butadiene-styrene, and 1,3-dienes and combinations thereof.

9. The composition of claim 8, wherein the composition is an applicator, a filtration medium, or a barrier medium.

21. The composition of claim 8, wherein the flexible region has a porosity ranging from 20 percent to 80 percent.

22. The composition of claim 8, wherein the flexible region has an average pore size ranging from 1 μ

m to 200 μ

m.

10. An applicator comprising:

a sintered porous polymeric material comprising a sintered mixture of particles of at least one plastic and particles of at least one thermoplastic elastomer, the sintered porous polymeric material having a porosity ranging from 20% to 80% and a rigidity of less than 5 pounds,

wherein the at least one plastic is selected from the group consisting of polyethylene, polypropylene, polyesters, polycarbonates, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfones, polystyrenes, polyether imides, polyetheretherketones, and polysulfones and combinations thereof;

wherein the at least one thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethanes, polyisobutylene, polybutenes, polyethylene-propylene copolymer, polyethylene-butene copolymer, polyethylene-octene copolymer, polyethylene-hexene copolymer, chlorinated polyethylene, chloro-sulfonated polyethylene, styrene-ethylene-butadiene-styrene, and 1,3-dienes and combinations thereof; and

a fibrous component coupled to the sintered porous polymeric material.

11. The applicator of claim 10, further comprising a reservoir coupled to the fibrous component.

12. The applicator of claim 10, wherein the fibrous component is a reservoir.

13. An apparatus comprising:

a housing; and

at least one filtration medium or at least one barrier medium disposed in the housing, wherein the at least one filtration medium or the at least one barrier medium comprises a sintered porous polymeric material comprising a sintered mixture of particles of at least one plastic and particles of at least one thermoplastic elastomer, the sintered porous polymeric material having a porosity ranging from 20% to 80% and a rigidity of less than 5 pounds,

wherein the at least one plastic is selected from the group consisting of polyethylene, polypropylene, polyesters, polycarbonates, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfones, polystyrenes, polyether imides, polyetheretherketones, and polysulfones and combinations thereof,

and wherein the at least one thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethanes, polyisobutylene, polybutenes, polyethylene-propylene copolymer, polyethylene-butene copolymer, polyethylene-octene copolymer, polyethylene-hexene copolymer, chlorinated polyethylene, chloro-sulfonated polyethylene, styrene-ethylene-butadiene-styrene, and 1,3-dienes and combinations thereof.

14. The apparatus of claim 13, wherein the housing comprises a vacuum filtration housing, a chromatographic column, a funnel, a tube, a duct, a syringe, a catheter, or a pipette tip.

15. A method of producing a sintered porous polymeric material comprising:

providing particles of at least one thermoplastic elastomer;

providing particles of at least one plastic;

mixing the thermoplastic elastomer particles and the plastic particles uniformly; and

sintering the plastic particles and the elastomer particles;

wherein the sintered porous polymeric material has a porosity ranging from 20% to 80% and a rigidity of less than 5 pounds, and

wherein the at least one plastic is selected from the group consisting of polyethylene, polypropylene, polyesters, polycarbonates, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfones, polystyrenes, polyether imides, polyetheretherketones, and polysulfones and combinations thereof, and wherein the at least one thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethanes, polyisobutylene, polybutenes, polyethylene-propylene copolymer, polyethylene-butene copolymer, polyethylene-octene copolymer, polyethylene-hexene copolymer, chlorinated polyethylene, chloro-sulfonated polyethylene, styrene-ethylene-butadiene-styrene, and 1,3-dienes and combinations thereof.

16. A method of producing a sintered porous polymeric material comprising:

disposing particles of a first plastic mixed with particles of at least one thermoplastic elastomer in a first part of a mold;

disposing particles of a second plastic in a second part of the mold adjacent to the first part of the mold; and

sintering the first plastic particles, the thermoplastic elastomer particles, and the second plastic particles to produce a flexible region comprising particles of the first plastic and the at least one thermoplastic elastomer, and a rigid region comprising particles of the second plastic;

wherein the first plastic and the second plastic are independently selected from the group consisting of polyethylene, polypropylene, polyesters, polycarbonates, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfones, polystyrenes, polyether imides, polyetheretherketones, and polysulfones and combinations thereof, and wherein the at least one thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethanes, polyisobutylene, polybutenes, polyethylene-propylene copolymer, polyethylene-butene copolymer, polyethylene-octene copolymer, polyethylene-hexene copolymer chlorinated polyehylene, chloro-sulfonated polyethylene, styrene-ethylene-butadiene-styrene, and 1,3-dienes and combinations thereof.

17. A method of producing an apparatus comprising:

providing a filtration medium or a barrier medium comprising a sintered porous polymeric material comprising a sintered mixture of particles of at least one plastic and particles of at least one thermoplastic elastomer, the sintered porous polymeric material having a porosity ranging from 20% to 80% and a rigidity of less than 5 pounds,

wherein the at least one plastic is selected from the group consisting of polyethylene, polypropylene, polyesters, polycarbonates, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfones, polystyrenes, polyether imides, polyetheretherketones, and polysulfones and combinations thereof;

and wherein the at least one thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethanes, polyisobutylene, polybutenes, polyethylene-propylene copolymer, polyethylene-butene copolymer, polyethylene-octene copolymer, polyethylene-hexene copolymer, chlorinated polyethylene, chloro-sulfonated polyethylene, styrene-ethylene-butadiene-styrene, and 1,3-dienes and combinations thereof

providing a housing; and

disposing the filtration medium or the barrier medium in the housing.

18. A method of producing an apparatus comprising:

providing a filtration medium or a barrier medium comprising a continuous sintered porous polymeric material comprising a flexible region and a rigid region, the flexible region comprising a sintered mixture of particles of a first plastic and particles of at least one thermoplastic elastomer, and the rigid region comprising sintered particles of a second plastic,

wherein the first plastic and the second plastic are independently selected from the group consisting of polyethylene, polypropylene, polycarbonates, polyesters, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfones, polystyrenes, polyether imides, polyetheretherketones, and polysulfones and combinations thereof;

and wherein the at least one thermoplastic elastomer is selected from the group consisting of thermoplastic polyurethanes, polyisobutylene, polybutenes, polyethylene-propylene copolymer, polyethylene-butene copolymer, polyethylene-octene copolymer, polyethylene-hexene copolymer, chlorinated polyethylene, chloro-sulfonated polyethylene, styrene-ethylene-butadiene-styrene, and 1,3-dienes and combinations thereof

providing a housing; and

disposing the filtration medium or the barrier medium in the housing.

19. The method of claim 18 further comprising forming a seal between the flexible region and the housing.

20. The method of claim 18, wherein the housing comprises a pipette tip.