WO2000037736A2 - Method of coating hydrophobic polymer fibers with poly(vinyl alcohol) - Google Patents
Method of coating hydrophobic polymer fibers with poly(vinyl alcohol) Download PDFInfo
- Publication number
- WO2000037736A2 WO2000037736A2 PCT/US1999/029701 US9929701W WO0037736A2 WO 2000037736 A2 WO2000037736 A2 WO 2000037736A2 US 9929701 W US9929701 W US 9929701W WO 0037736 A2 WO0037736 A2 WO 0037736A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- poly
- vinyl alcohol
- fibers
- hydrophobic polymer
- polymer fibers
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/327—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated alcohols or esters thereof
- D06M15/333—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated alcohols or esters thereof of vinyl acetate; Polyvinylalcohol
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
- B01D2239/0428—Rendering the filter material hydrophobic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0471—Surface coating material
- B01D2239/0492—Surface coating material on fibres
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/20—Polyalkenes, polymers or copolymers of compounds with alkenyl groups bonded to aromatic groups
Definitions
- the present invention relates to coated fibers. More particularly, the present invention relates to coated hydrophobic polymer fibers.
- Polymers are used extensively to make a variety of products which include blown and cast films, extruded sheets, injection molded articles, foams, blow molded articles, extruded pipe, monofilaments, and nonwoven webs. Some of such polymers, such as polyolefins, are naturally hydrophobic, and for many uses this property is either a positive attribute or at least not a disadvantage.
- hydrophobic polymers there are a number of uses for hydrophobic polymers, however, where their hydro- phobic nature either limits their usefulness or requires some effort to modify the surface characteristics of articles made therefrom.
- polyolefins such as polyethylene and polypropylene
- polymeric fabrics which are employed in the construction of such disposable absorbent articles as diapers; incontinent care products; feminine care products, such as sanitary napkins and tampons; filter elements; wipes; surgical gowns and drapes; protective pads; wound dressings, such as bandages; and the like.
- Such polymeric fabrics often are nonwoven webs prepared by, for example, such processes as meltblowing, coforming, and spunbonding. Frequently, such polymeric fabrics need to be wettable by water.
- Wettability can be obtained by spraying or otherwise coating (i.e., surface treating or topically treating) the fabric with a surfactant solution during or after its formation, and then drying the web.
- a surfactant solution i.e., surface treating or topically treating
- Some of the more common topically applied surfactants are nonionic surfactants, such as polyethoxylated octylphenols and condensation products of propylene oxide with propylene glycol, by way of illustration only. These surfactants are effective in rendering normally hydrophobic polymeric fabrics wettable. However, the surfactant is readily removed from the fabric, often after only a single exposure to an aqueous liquid.
- a surfactant can be included in the polymer which is to be melt- processed, as disclosed in U.S. Pat. Nos.
- the surfactant must be forced to the surface of the fibers from which the web is formed. This typically is done by heating the web on a series of steam-heated rolls or "hot cans". This process, called “blooming", is expensive and still has the disadvantage of ready removal of the surfactant by aqueous media. Moreover, the surfactant has a tendency to migrate back into the fiber which adversely affects shelf life, particularly at high storage temperatures. In addition, it is not possible to incorporate in the polymer levels of surfactant much above 1 percent by weight because of severe processability problems; surfactant levels at the surface appear to be limited to a maximum of about 0.33 percent by weight. Most importantly, the blooming process results in web shrinkage in the cross-machine direction and a significant loss in web tensile strength.
- Poly(vinyl alcohol) has interesting physical and chemical properties which are associated with its affinity for water.
- Crosslinked and noncrosslinked hydrogels of the polymer are used in numerous devices such as contact lenses (U.S. Pat. No. 4,696,037 to Ofstead), composite glass (U.S. Pat. No. 5,367,015 to Gutweiler et al.), and synthetic papers (U.S. Pat. Nos. 3,560,318 to Miller et al.; 4,002,796 to Baldi et al.; 4,152,317 to Agouri et al.; and 4,510,185 to Chiolle et al.).
- coatings of poly(vinyl alcohol) are described as being formed by deposition of aqueous emulsions of the polymer on hydrophobic substrates which most typically are fibrils of high density polyethylene.
- surface modification of polyamides has been described, wherein poly(vinyl alcohol) has been partially esterified with polycarboxylic acids. The partially esterified material is bound to the polyamide surface via free carboxylate function- alities and reactive groups on the polyamide surface (U.S. Pat. No. 3,050,418 to Mendelsohn et al.).
- a composite material formed from poly(vinyl alcohol), a modified starch, and water-soluble cellulose has found utility as an aqueous-based size for cotton and cotton/polyester yarns (U.S. Pat. No. 5,420,180 to Kayayama et al.).
- poly(vinyl alcohol) as a coating on hydrophobic polymer surfaces is known.
- Such coating was achieved by first treating the polymer surfaces with a nonaqueous solution of a hydrophobic vinyl polymer, such as poly(vinyl trifluoroacetate), having readily hydrolyzable pendant groups.
- a hydrophobic vinyl polymer such as poly(vinyl trifluoroacetate)
- pendant groups were hydrolyzed under mild conditions after deposition of the hydrophobic vinyl polymer on the substrate to give a coating of poly(vinyl alcohol) on the surfaces of the polymer substrate (U.S. Pat. No. 5,733,603 to Turkevich et al.).
- the present invention addresses some of the difficulties and problems discussed above by providing a method of coating hydrophobic polymer fibers with a poly(vinyl alcohol).
- the method involves providing hydrophobic polymer fibers, preparing a solution of the poly(vinyl alcohol) in water, and treating the hydrophobic polymer fibers with the poly(vinyl alcohol) solution under conditions sufficient to deposit the poly(vinyl alcohol) on the surfaces of the fibers.
- the hydrophobic polymer fibers are polyolefin fibers.
- the polyolefin fibers may be polypropylene or polyethylene fibers.
- the poly(vinyl alcohol) useful in the present invention is that which generally is referred to as hot water-soluble poly(vinyl alcohol).
- the poly(vinyl alcohol) will have a degree of hydrolysis of at least about 88 percent.
- such material may be highly hydrolyzed, having a degree of hydrolysis of at least about 98 percent.
- the poly(vinyl alcohol) will have a degree of hydrolysis of 99 percent or greater.
- the molecular weight of the poly(vinyl alcohol) typically will be at least about 10,000, which corresponds approximately to a degree of polymerization of 200.
- the present invention also provides a method of coating hydrophobic polymer fibers with a poly(vinyl alcohol).
- the method involves providing hydrophobic polymer fibers, dissolving the poly(vinyl alcohol) in water at a temperature of at least about 60°C to obtain a poly(vinyl alcohol) solution, and treating the hydrophobic polymer fibers with the poly(vinyl alcohol) solution under conditions sufficient to deposit the poly(vinyl alcohol) on the surfaces of the fibers.
- the hydrophobic polymer fibers may be polyolefin fibers, such as polypropylene or polyethylene fibers.
- the present invention provides coated fibers, composed of a hydrophobic polymer, in which the fibers have on the surfaces thereof a coating of a poly(vinyl alcohol) applied by a method of the present invention.
- hydrophobic polymer is used herein to mean any polymer resistant to wetting, or not readily wet, by water, i.e., having a lack of affinity for water.
- a hydrophobic polymer typically will have a surface free energy of about 40 dynes/cm (10 5 newtons/cm or N/cm) or less.
- hydrophobic polymers include, by way of illustration only, polyolefins, such as poylethylene, poly(isobutene), poly(isoprene), poly(4-methyl-1-pentene), polypropylene, ethylene-propylene copolymers, and ethylene-propylene-hexadiene copolymers; ethylene-vinyl acetate copolymers; styrene polymers, such as poly(styrene), poly(2-methylstyrene), styrene-acrylonitrile copolymers having less than about 20 mole- percent acrylonitrile, and styrene-2,2,3,3,-tetrafluoropropyl methacrylate copolymers; halogenated hydrocarbon polymers, such as poly(chloro-trifluoroethylene), chlorotrifluoroethylene-tetrafluoroethylene copolymers, poly(hexa-fluoropropylene), poly(tetraflu
- the hydrophobic polymer fibers desirably will be fibers prepared from thermoplastic polyolefins, or mixtures thereof.
- thermoplastic polyolefins include polyethylene, polypropylene, poly(l-butene), poly(2-butene), poly(l-pentene), poly(2-pentene), poly(3- methyl-1-pentene), poly(4-methyl-1-pentene), and the like.
- polyolefins is meant to include blends of two or more polyolefins and random and block copolymers prepared from two or more different unsaturated monomers. Because of their commercial importance, the most desirable polyolefins are polyethylene and polypropylene.
- Poly(vinyl alcohol) is manufactured commercially by the hydrolysis of poly(vinyl acetate).
- the physical properties of poly(vinyl alcohol) largely are a function of the degree of hydrolysis and molecular weight.
- the poly(vinyl alcohol) useful in the present invention is that which typically is referred to as hot water-soluble poly(vinyl alcohol).
- the poly(vinyl alcohol) will have a degree of hydrolysis of at least about 88 percent.
- such material may be highly hydrolyzed, having a degree of hydrolysis of at least about 98 percent.
- the poly(vinyl alcohol) will have a degree of hydrolysis of 99 percent or greater.
- the molecular weight of the poly(vinyl alcohol) typically will be at least about 10,000, which corresponds approximately to a degree of polymerization of 200. As a rule, the lower the degree of hydrolysis, the higher must be the molecular weight of the polymer. Similarly, a lower molecular weight material requires a higher degree of hydrolysis. Correct combinations of degree of hydrolysis and molecular weight may be determined readily by those having ordinary skill in the art without the need for undue experimentation.
- the resistance of poly(vinyl alcohol) to water are functions of both the molecular weight of the polymer and the degree of hydrolysis. At a constant degree of hydrolysis, increases in molecular weight also increase the water resistance of the polymer. At a constant molecular weight, however, increases in the degree of hydrolysis increase the adhesion of the polymer to hydrophilic surfaces while increasing water resistance; this means that the adhesion to hydrophobic surfaces must decrease with increases in the degree of hydrolysis. Thus, the ability of a poly(vinyl alcohol) having a high degree of hydrolysis to durably adhere to hydrophobic polymer fibers is unexpected.
- the hydrophobic polymer fibers are treated with the poly(vinyl alcohol) solution under conditions sufficient to deposit the poly(vinyl alcohol) on the surfaces of the fibers.
- Such conditions typically involve passing the poly(vinyl alcohol) solution around the hydrophobic polymer fibers under shear stress conditions so that at least a portion of the poly(vinyl alcohol) is adsorbed onto at least some of the hydrophobic polymer fibers.
- the poly(vinyl alcohol) solution may be passed around the hydrophobic polymer fibers by any means known to those having ordinary skill in the art.
- the solution may be "pulled" past the fibers by reducing the pressure on the side of the fibers which is opposite the side against which the solution has been applied.
- the solution may be forced past the fibers by the application of pressure.
- the solution may be spayed onto the fibers which then are passed through a nip to remove excess solution.
- Two layers of 1.875-inch (about 4.8-cm) diameter regular polypropylene meltblown discs, each having a basis weight of about 1 ounce per square yard or osy (about 34 grams per square meter or gsm) were placed in a Nalgene filter holder (250-ml capacity, Nalgene # 300-4000, Nalge Nunc International, Naperville, Illinois).
- Two hundred ml of a 0.1 percent by weight aqueous solution of poly(vinyl alcohol) (Elvanol ® 7006, Dupont Chemical Company, Wilmington, Delaware) was placed on top of the layers and then passed through the layers over a period of ten seconds by reducing the pressure on the opposite side.
- the treated meltblown discs were air dried.
- the contact angles of treated and untreated (control) samples were measured by means of a Goniometer. The treated samples had a contact angle of 0 degrees compared to a 135-degree contact angle for the untreated samples.
- a single layer of a 1.875-inch (about 4.8-cm) diameter polypropylene spunbond- meltblown-spunbond (SMS) disc prepared essentially as described in U.S. Patent No. 4,041 ,203 to Brock et al., which patent is incorporated herein by reference in its entirety, and having a basis weight of about 4 osy (about 136 gsm), was treated with a 0.1 percent aqueous poly(vinyl alcohol) solution as described in Example 1. Water uptake of the dried, treated disc was determined as described in Example 1; the results are summarized in Table 2.
- Example 2 The procedure of Example 2 was repeated, except that the polypropylene SMS disc was replaced with a polypropylene spunbond disc having a basis weight of about 3 osy (about 102 gsm). Water uptake of the dried, treated disc was determined as described in Example 1 ; the results are summarized in Table 3.
- the poly(vinyl alcohol) was obtained from Aldrich (Catalog No. 18,934-0, Aldrich Chemical Company, Milwaukee, Wisconsin, 88 percent hydrolyzed and having a weight-average molecular weight of 96,000).
- the web was removed from the solution and air dried. When the dried web was put in contact with water, it was wet in seconds. The wet web was air dried and put in contact with water again. This dry and wet cycle was repeated ten times without a noticeable decrease in wettability.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU27093/00A AU2709300A (en) | 1998-12-18 | 1999-12-15 | Method of coating hydrophobic polymer fibers with poly(vinyl alcohol) |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21606498A | 1998-12-18 | 1998-12-18 | |
US09/216,064 | 1998-12-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000037736A2 true WO2000037736A2 (en) | 2000-06-29 |
WO2000037736A3 WO2000037736A3 (en) | 2000-09-14 |
Family
ID=22805529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1999/029701 WO2000037736A2 (en) | 1998-12-18 | 1999-12-15 | Method of coating hydrophobic polymer fibers with poly(vinyl alcohol) |
Country Status (4)
Country | Link |
---|---|
AR (1) | AR021732A1 (en) |
AU (1) | AU2709300A (en) |
PE (1) | PE20001253A1 (en) |
WO (1) | WO2000037736A2 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6565743B1 (en) * | 1999-08-31 | 2003-05-20 | Kimberly-Clark Worldwide, Inc. | Portable purification container with cumulative use indicator |
WO2007146956A2 (en) | 2006-06-12 | 2007-12-21 | Rhodia Inc. | Hydrophilized substrate and method for hydrophilizing a hydrophobic surface of a substrate |
CN100431621C (en) * | 2006-11-03 | 2008-11-12 | 利芳建医药科技咨询(上海)有限公司 | Method for producing antivirus pad |
US8263049B2 (en) | 2007-06-12 | 2012-09-11 | Rhodia Operations. | Mono-, di- and polyol alkoxylate phosphate esters in oral care formulations and methods for using same |
US8263542B2 (en) | 2007-06-12 | 2012-09-11 | Rhodia Operations | Detergent composition with an organophosphorus hydrophilizing soil-release agent and methods for using same |
US9149749B2 (en) | 2012-11-13 | 2015-10-06 | Hollingsworth & Vose Company | Pre-coalescing multi-layered filter media |
US9149748B2 (en) | 2012-11-13 | 2015-10-06 | Hollingsworth & Vose Company | Multi-layered filter media |
US10195542B2 (en) | 2014-05-15 | 2019-02-05 | Hollingsworth & Vose Company | Surface modified filter media |
US10399024B2 (en) | 2014-05-15 | 2019-09-03 | Hollingsworth & Vose Company | Surface modified filter media |
US10625196B2 (en) | 2016-05-31 | 2020-04-21 | Hollingsworth & Vose Company | Coalescing filter media |
US10828587B2 (en) | 2015-04-17 | 2020-11-10 | Hollingsworth & Vose Company | Stable filter media including nanofibers |
US11090590B2 (en) | 2012-11-13 | 2021-08-17 | Hollingsworth & Vose Company | Pre-coalescing multi-layered filter media |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0058978A2 (en) * | 1981-02-25 | 1982-09-01 | Hoechst Aktiengesellschaft | Sizing agent for synthetic fibres |
EP0252477A2 (en) * | 1986-07-07 | 1988-01-13 | Air Products And Chemicals, Inc. | Waxless polyvinyl alcohol size composition |
US5346725A (en) * | 1993-08-18 | 1994-09-13 | Targosz Eugene F | Treatment for nylon and other textiles |
-
1999
- 1999-12-15 WO PCT/US1999/029701 patent/WO2000037736A2/en active Application Filing
- 1999-12-15 AU AU27093/00A patent/AU2709300A/en not_active Abandoned
- 1999-12-15 PE PE1999001257A patent/PE20001253A1/en not_active Application Discontinuation
- 1999-12-16 AR ARP990106479A patent/AR021732A1/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0058978A2 (en) * | 1981-02-25 | 1982-09-01 | Hoechst Aktiengesellschaft | Sizing agent for synthetic fibres |
EP0252477A2 (en) * | 1986-07-07 | 1988-01-13 | Air Products And Chemicals, Inc. | Waxless polyvinyl alcohol size composition |
US5346725A (en) * | 1993-08-18 | 1994-09-13 | Targosz Eugene F | Treatment for nylon and other textiles |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6565743B1 (en) * | 1999-08-31 | 2003-05-20 | Kimberly-Clark Worldwide, Inc. | Portable purification container with cumulative use indicator |
WO2007146956A2 (en) | 2006-06-12 | 2007-12-21 | Rhodia Inc. | Hydrophilized substrate and method for hydrophilizing a hydrophobic surface of a substrate |
EP2029354A2 (en) * | 2006-06-12 | 2009-03-04 | Rhodia, Inc. | Hydrophilized substrate and method for hydrophilizing a hydrophobic surface of a substrate |
EP2029354A4 (en) * | 2006-06-12 | 2011-08-10 | Rhodia | Hydrophilized substrate and method for hydrophilizing a hydrophobic surface of a substrate |
EP2610056A1 (en) * | 2006-06-12 | 2013-07-03 | Rhodia Inc. | Hydrophilized substrate and method for hydrophilizing a hydrophobic surface of a substrate |
CN100431621C (en) * | 2006-11-03 | 2008-11-12 | 利芳建医药科技咨询(上海)有限公司 | Method for producing antivirus pad |
US8263049B2 (en) | 2007-06-12 | 2012-09-11 | Rhodia Operations. | Mono-, di- and polyol alkoxylate phosphate esters in oral care formulations and methods for using same |
US8263542B2 (en) | 2007-06-12 | 2012-09-11 | Rhodia Operations | Detergent composition with an organophosphorus hydrophilizing soil-release agent and methods for using same |
US10080985B2 (en) | 2012-11-13 | 2018-09-25 | Hollingsworth & Vose Company | Multi-layered filter media |
US9149748B2 (en) | 2012-11-13 | 2015-10-06 | Hollingsworth & Vose Company | Multi-layered filter media |
US9149749B2 (en) | 2012-11-13 | 2015-10-06 | Hollingsworth & Vose Company | Pre-coalescing multi-layered filter media |
US10279291B2 (en) | 2012-11-13 | 2019-05-07 | Hollingsworth & Vose Company | Pre-coalescing multi-layered filter media |
US11090590B2 (en) | 2012-11-13 | 2021-08-17 | Hollingsworth & Vose Company | Pre-coalescing multi-layered filter media |
US10195542B2 (en) | 2014-05-15 | 2019-02-05 | Hollingsworth & Vose Company | Surface modified filter media |
US10399024B2 (en) | 2014-05-15 | 2019-09-03 | Hollingsworth & Vose Company | Surface modified filter media |
US11266941B2 (en) | 2014-05-15 | 2022-03-08 | Hollingsworth & Vose Company | Surface modified filter media |
US10828587B2 (en) | 2015-04-17 | 2020-11-10 | Hollingsworth & Vose Company | Stable filter media including nanofibers |
US11819789B2 (en) | 2015-04-17 | 2023-11-21 | Hollingsworth & Vose Company | Stable filter media including nanofibers |
US10625196B2 (en) | 2016-05-31 | 2020-04-21 | Hollingsworth & Vose Company | Coalescing filter media |
US11338239B2 (en) | 2016-05-31 | 2022-05-24 | Hollingsworth & Vose Company | Coalescing filter media |
Also Published As
Publication number | Publication date |
---|---|
AU2709300A (en) | 2000-07-12 |
AR021732A1 (en) | 2002-07-31 |
WO2000037736A3 (en) | 2000-09-14 |
PE20001253A1 (en) | 2000-11-21 |
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