Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
  • C09J133/04—Homopolymers or copolymers of esters
  • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
  • C09J133/062—Copolymers with monomers not covered by C09J133/06
  • C09J133/064—Copolymers with monomers not covered by C09J133/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B5/00—Measuring for diagnostic purposes; Identification of persons
  • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
  • A61B5/25—Bioelectric electrodes therefor
  • A61B5/251—Means for maintaining electrode contact with the body
  • A61B5/257—Means for maintaining electrode contact with the body using adhesive means, e.g. adhesive pads or tapes
  • A61B5/259—Means for maintaining electrode contact with the body using adhesive means, e.g. adhesive pads or tapes using conductive adhesive means, e.g. gels
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
  • C09J7/38—Pressure-sensitive adhesives [PSA]
  • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
  • C09J7/385—Acrylic polymers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
  • C08L2666/14—Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/28—Non-macromolecular organic substances
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
  • C08L71/02—Polyalkylene oxides
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
  • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/913—Material designed to be responsive to temperature, light, moisture
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/249921—Web or sheet containing structurally defined element or component
  • Y10T428/249994—Composite having a component wherein a constituent is liquid or is contained within preformed walls [e.g., impregnant-filled, previously void containing component, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]

Definitions

• the invention relates to electrically conductive transparent pressure sensitive adhesive films with an electrical conductivity above 10 '5 S, which are suitable for the production of biomedical electrodes.
• the current standard version of such biomedical electrodes contains an electrically conductive gel in a hole punched out of foam materials, the shelf life of which is limited due to the drying out which increases with the storage time.
• a further disadvantage of this drying out is that the skin has to be cleaned of gel residues after use of the electrode or that the patient's clothing can be contaminated if the gel residues are not carefully removed.
• pressure-sensitive conductive strips which contain film-forming ionized organic polymer seeds.
• the polymers themselves are only slightly soluble in water, but are made hydrophilic and ionogenic by the built-in functional groups capable of salt formation. Suitable examples are the sodium salts of sulfonated styrene and polybenzyl sulfonate.
• Another preferred group are the salts of quaternized polymers from dimethylaminoethyl methacrylate or its copolymers with butyl acrylate and 4-vinylpyridine, which has been quaternized with methyl bromide or allyl chloride to 95 to 100%.
• conductive PSAs made from a hydrogen donor monomer (for example acrylic acid) and a hydrogen acceptor monomer (for example N-vinylpyrrolidone) are used to produce electrically conductive PSA films.
• a hydrogen donor monomer for example acrylic acid
• a hydrogen acceptor monomer for example N-vinylpyrrolidone
• a mixture of water and glycerol is used as the polymerisation medium.
• a water-soluble salt is added to the copolymer and bifunctional (meth) acrylate is added as a crosslinking agent.
• EP-A 0322098 describes the production of electrically conductive PSA films in which a hydrophilic PSA based on N-vinyl lactam is used in a mixture with a plasticizer and crosslinked with polyfunctional ethylenically unsaturated derivatives.
• the present invention is therefore based on the object of producing electrically conductive pressure-sensitive adhesive films which have excellent moisture resistance and stable internal strength and are ideally suited for producing reusable biomedical electrodes.
• electrically conductive transparent pressure-sensitive adhesive films with an electrical conductivity above 10 5 S consist of 100 parts by weight of an acrylate-based copolymer containing carboxyl groups, 50 to 150 parts by weight of a water-soluble amine and 50 to 250 parts by weight of a polyoxyalkylene a molecular mass below 1000 and / or a polyol and / or its derivatives, 50 to 200 parts by weight of an electrolyte solution and 0.1 to 6 parts by weight of a crosslinking agent.
• the preferred carboxyl group-containing copolymers based on acrylate are preferably obtained by a radical solvent polymerization of
• alkyl (meth) acrylates with 4 to 12 carbon atoms in the alkyl radical are butyl, pentyl, hexyl, heptyl, octyl, 2-ethylhexyl, isooctyl, 2-methylheptyl, nonyl, isononyl, Decyl or dodecyl (meth) acrylate preferred.
• Hydroxyalkyl (meth) acrylates are preferred as hydroxyl-containing (meth) acrylates, in particular 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate or 4-hydroxybutyl (meth) acrylate, which can be used alone or as a mixture with one another.
• Preferred vinyl carboxylic acids which form active crosslinking centers in the finished polymer are (meth) acrylic acid, ⁇ -acryloyloxypropionic acid, vinyl acetic acid, aconitic acid, trichloracrylic acid, dimethyiacrylic acid, crotonic acid, fumaric acid or itaconic acid, and (meth) acrylic acid and ⁇ -acryloyloxypropionic acid are particularly preferred.
• the salts of the unsaturated organic sulfonic acids which are used to prepare the carboxyl-containing copolymer based on acrylate are preferably metal salts, in particular alkali metal and / or ammonium salts, the salts of vinylsulfonic acid, 2-methylprop-1-en-3-sulfonic acid, Vinylbenzylsulonic acid and 2-acrylamido-2-methylpropanesuifonic acid are preferred.
• the lithium, sodium and / or potassium salts are particularly suitable as metal salts.
• Known carboxyl group-containing N-substituted (meth) acrylamide derivatives are preferably N-substituted (meth) acrylamide derivatives of the general formula
• R a hydrogen atom, an alkyl, aryl, arylalkyl, alkylaryl, alkoxyalkyl, alkoxyaryl, acetylalkyl or acetylalkoxyalkyl group
• R 2 is a carboxyalkyl or carboxylaryl group
• R 3 is a hydrogen atom or a methyl group
• the carboxyl group-containing copolymer is used together with a water-soluble amine.
• Water-soluble polyoxyalkylene amines of the general formula are particularly preferred.
• Polyethylene glycols, polypropylene glycols, polyoxypropylene / polyoxyethylene copolymers, monoethylene glycol dimethyl ether or polyethylene glycol dimethyl ether are used as polyoxyalkylenes with a molecular mass below 1000.
• Preferred polyols are glycerol or its derivatives such as diacetin, glyceraldehyde, glyceric acid. Glyceric acid methyl ester, "monoacetin or" monobutirine.
• an electrolyte solution (aqueous solution of organic or inorganic salts) is added to the copolymer.
• a physiologically harmless aqueous NaCI or KCI solution is particularly preferred.
• Suitable chelating agents which can form an intermolecular structure with the carboxyl groups are metal chelates, metalic acid esters, epoxy, aziridine or melamine formaldehyde resins.
• Crosslinking agents which react at room temperature, such as metal chelates, are particularly suitable.
• the acrylate-based copolymer containing acrylate groups is synthesized from the required components in a manner known per se by radical polymerization in solvents.
• the polymer obtained is stabilized with isopropyl alcohol and mixed with a water-soluble amine, polyoxyalkylene or polyol, aqueous electrolyte solution and a crosslinking agent.
• the homogeneous PSA obtained in this way is applied to a siliconized film, dried in a drying tunnel at 65 ° C. and then processed by lamination onto an appropriate base to form an electrically conductive PSA article.
• the polymers formed from the monomers listed in Table 1 by solution polymerization have a solids content of about 50% by weight.
• the polymer solution is mixed with the components shown in Table 2, such as water-soluble amine, polyoxyalkylene or polyol, electrolyte solution and crosslinking agent.
• the PSAs obtained in this way were applied to a siliconized polyester film, dried in a drying tunnel at 65 ° C. for 10 minutes and then covered with an aluminized polyester film. The mass application was approx. 140 g / m 2
• the finished product was conditioned for 1 week at room temperature.
• the electrical conductivity of the transparent PSA films was measured using a high-ohm measuring device in accordance with DIN 53 482.
• the electrically conductive PSA film produced with the PSA synthesized according to Example 1 was transferred to a polyethylene foam. Between the polyethylene foam and the laminated, electrically conductive pressure-sensitive adhesive film was a row of parallel electrode strips with a short, approx. 40 cm long connection cable. The contact area was 40 x 40 mm.

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Health & Medical Sciences (AREA)
• Organic Chemistry (AREA)
• Surgery (AREA)
• Public Health (AREA)
• Pathology (AREA)
• Engineering & Computer Science (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Medical Informatics (AREA)
• Molecular Biology (AREA)
• Physics & Mathematics (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Biophysics (AREA)
• Veterinary Medicine (AREA)
• Dispersion Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
• Electrotherapy Devices (AREA)
• Manufacturing Of Electric Cables (AREA)
• Non-Insulated Conductors (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)

Priority Applications (8)

Applications Claiming Priority (2)

Publications (1)

Family

ID=27511468

Family Applications (1)

Country Status (8)

Cited By (5)

Families Citing this family (29)

Citations (5)

Family Cites Families (4)

• 1990
  • 1990-12-13 DE DE4039780A patent/DE4039780C1/de not_active Expired - Fee Related
• 1991
  • 1991-12-05 DE DE59108010T patent/DE59108010D1/de not_active Expired - Fee Related
  • 1991-12-05 ES ES92900042T patent/ES2092087T3/es not_active Expired - Lifetime
  • 1991-12-05 EP EP19920900042 patent/EP0561854B1/de not_active Expired - Lifetime
  • 1991-12-05 US US08/070,470 patent/US5433892A/en not_active Expired - Fee Related
  • 1991-12-05 DK DK92900042T patent/DK0561854T3/da active
  • 1991-12-05 WO PCT/EP1991/002318 patent/WO1992010553A1/de not_active Ceased
  • 1991-12-05 AT AT92900042T patent/ATE140472T1/de not_active IP Right Cessation
• 1996
  • 1996-09-05 GR GR960402324T patent/GR3020968T3/el unknown

Patent Citations (5)

Also Published As

Similar Documents

Legal Events