US5156780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
process for treating a porous substrate to achieve improved water and oil repellency
Assignee: Pall Corp
•
Filing: 1990-07-18
•
Granted: 1992-10-20
•
Expires: 2010-07-18
Abstract
Abstract Oil and water repellency is conferred upon porous substrates (10) by treatment with a solution of a monomer (16) of the formula: (C n E 2n+1 )(CH 2 ) x (CHR)OCOCH═CH 2 where n is an integer; X is 0,1,2 or 3 and R is H or CH 2 --OCOCH═CH 2 . The monomer is polymerized in situ upon the substrate to provide a conformal coating (16') which preserves the porous structure.
Inventors
- 👤 Yitzchak Kenigsberg
- 👤 Ehud Shchori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:29
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0088; C; C09; C09D; C09D4/00; D; D06; D06M; D06M14/00; D06M14/18; D06M14/20; D06N; D06N3/00; D06N3/04; D06N3/047; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/46; D21H19/48; D21H21/00; D21H21/14; D21H21/16
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
150 words
A method for treating a porous substrate (10) to achieve permanent water and oil repellency while maintaining the porosity thereof, the method comprising the steps of: A) providing a fluoroacrylate monomer (16) of the formula (C n F 2n+1 ) (CH 2 ) x (CHR) OCOCH═CH 2 , where: n is an integer, X is: 0, 1, 2 or 3 and R is: H or CH 2 OCOCH═CH 2 ; B) disposing the monomer (16) in a carrier vehicle so as to form a mixture (14) thereof; C) impregnating the substrate (10) with the monomer mixture (14); d) removing substantially all of the vehicle from the substrate (10): and E) initiating polymerization of the monomer (16) after substantially all of the vehicle is removed from the substrate whereby the monomer (16) is polymerized to form a conformal, oil and water repellant coating (16') which is mechanically adhered to the substrate.
Claim 2
Independent Claim
150 words
A method for treating a porous substrate (10) to achieve permanent water and oil repellency while maintaining the porosity thereof, the method comprising the steps of: A) providing a fluoroacrylate monomer (16) of the formula (C n F 2n+1 ) (CH 2 ) x (CHR) OCOCH═CH 2 , where: n is an integer, X is: 0, 1, 2 or 3 and R is: H or CH 2 OCOCH═CH 2 ; B) disposing the monomer (16) in a carrier vehicle so as to form a mixture (14) thereof; C) impregnating the substrate (10) with the monomer mixture (14); d) removing substantially all of the vehicle from the substrate (10): and E) initiating polymerization of the monomer (16) after substantially all of the vehicle is removed from the substrate whereby the monomer (16) is polymerized to form a conformal, oil and water repellant coating (16') which is mechanically adhered to the substrate.
Claim 3
Dependent Claim
39 words
A method as in claim 1, wherein said monomer (16) comprises a number of homologues corresponding to different values of n and wherein at least 5% of said homologues have a value of n which is at least 8.
Claim 4
Dependent Claim
23 words
A method as in claim 2, wherein at least 30% of said homologues have a value of n which is at least 8.
Claim 5
Dependent Claim
23 words
A method as in claim 2 wherein at least 50% of said homologues have a value of n which is at least 8.
Claim 6
Dependent Claim
63 words
A method as in claim 1, including the further step of providing an initiator which is activatable to cause polymerization of the monomer (16) and wherein the step of disposing the monomer (16) in a carrier vehicle includes the further step of disposing the initiator in the vehicle and wherein the step of initiating polymerization of the monomer (16) comprises activating the initiator.
Claim 7
Dependent Claim
30 words
A method as in claim 5, wherein the step of providing an intiator comprises providing a photoinitiator and the step of activating the initiator comprises irradiating the photoinitiator with light.
Claim 8
Dependent Claim
31 words
A method as in claim 5, wherein the step of providing an intiator comprises providing a free radical initiator and wherein the step of activating the initiator comprises heating the initiator.
Claim 9
Dependent Claim
24 words
A method as in claim 1, wherein the step of initiating polymerization of the monomer (16) comprises bombarding the monomer with an electron beam.
Claim 10
Dependent Claim
66 words
A method as in claim 1, including the further step of providing a cross-linking reagent so as to provide a monomer mixture and the step of disposing the monomer (16) in a carrier vehicle includes the further step of disposing said monomer mixture in the carrier vehicle and the step of initiating polymerization of the monomer (16) includes the further step of activating the cross-linking reagent.
Claim 11
Dependent Claim
33 words
A method as in claim 9, wherein the step of providing a cross-linking reagent comprises providing a member selected from the group consisting essentially of: monoacrylates, diacrylates, triacrylates, polyacrylates, monoacrylamides and combinations thereof.
Claim 12
Dependent Claim
48 words
A method as in claim 1, wherein the step of disposing the monomer (16) in a carrier vehicle comprises disposing sufficient monomer in a carrier vehicle so that the substrate (10), when impregnated with the monomer mixture (14) will include approximately 0.1-10% by weight of monomer (16) thereupon.
Claim 13
Dependent Claim
27 words
A method as in claim 1, wherein the step of disposing the monomer (16) in a carrier vehicle comprises disposing the monomer (16) in a fluorocarbon vehicle.
Claim 14
Dependent Claim
32 words
A method as in claim 1, wherein the step of disposing the monomer (16) in a carrier vehicle comprises disposing the monomer (16) in a an aqueous emulsion of a non-aqueous solvent.
Claim 15
Dependent Claim
34 words
A method as in claim 9, wherein the step of providing a cross-linking reagent comprises providing an amount of cross-linking reagent which is equal by weight to up to 80% of said monomer mixture.
Claim 16
Dependent Claim
34 words
A method as in claim 9, wherein the step of providing a cross-linking reagent comprises providing an amount of cross-linking reagent which is equal by weight to up to 50% of said monomer mixture.
Claim 17
Dependent Claim
38 words
A method as in claim 1, wherein said substrate (10) is a polymeric substrate prepared from a polymer chosen from the group consisting essentially of: polytetrafluoroethylene, vinyl, polyamide, polyurethane, polyvinylidene fluoride, polypropylene, polyethylene, polysulfone, poly(ethersulfone) and combinations thereof.
Claim 18
Dependent Claim
33 words
A method as in claim 1, wherein said substrate (10) is prepared from a material chosen from the group consisting essentially of: woven fabric, knitted fabric, non-woven fabric, paper, leather and combinations thereof.
References Cited (Backward Citations)
US3282905A
Cited
US3277039A
Cited
US3491169A
Cited
US3617355A
Cited
US3654244A
Cited
US3660360A
Cited
US3869465A
Cited
US3847657A
Cited
US3854871A
Cited
US3920389A
Cited
US3940359A
Cited
US4466931A
Cited
JPS6039482A
Cited
US4592930A
Cited
EP0193370A2
Cited
EP0216622A2
Cited
EP0271054A2
Cited
EP0287736B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |