Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L24/00—Surgical adhesives or cements; Adhesives for colostomy devices
  • A61L24/04—Surgical adhesives or cements; Adhesives for colostomy devices containing macromolecular materials
  • A61L24/043—Mixtures of macromolecular materials
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
  • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
  • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
  • A61L15/42—Use of materials characterised by their function or physical properties
  • A61L15/58—Adhesives
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/04—Polysiloxanes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/28—Treatment by wave energy or particle radiation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/14—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
• • 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
  • C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
  • C09J183/04—Polysiloxanes
• • 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
  • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
  • C08J2383/04—Polysiloxanes
• • 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
  • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• • 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
  • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
  • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
  • Y10T428/264—Up to 3 mils
  • Y10T428/265—1 mil or less
• • 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
  • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
  • Y10T428/2852—Adhesive compositions
• • 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]
  • Y10T428/31652—Of asbestos
  • Y10T428/31663—As siloxane, silicone or silane

Definitions

• the present disclosure relates to silicone release materials and release liners incorporating such release materials.
• the present disclosure relates to electron beam cured polysiloxanes, including low molecular weight polysiloxane fluids.
• the present disclosure provides a method of making a silicone release layer.
• the methods include applying a composition comprising a polysiloxane material on a substrate and electron beam curing the composition to crosslink the polysiloxane material.
• the polysiloxane material consists essentially of one or more polysiloxane fluids having a kinematic viscosity at 25 0 C of no greater than 50,000 centistokes, e.g., between 5,000 and 50,000 centistokes.
• the polysiloxane material comprises a poly dimethylsiloxane.
• all polysiloxane materials in the composition are nonfunctional polysiloxanes.
• each nonfunctional polysiloxane is a polysiloxane fluid having a kinematic viscosity at 25 0 C of no greater than 50,000 centistokes, e.g., between 5,000 and 50,000 centistokes.
• the polysiloxane material comprises a silanol terminated polysiloxane fluid having a kinematic viscosity at 25 0 C of no greater than 50,000 centistokes, e.g., between 5,000 and 50,000 centistokes.
• each polysiloxane material in the composition is independently selected from the group consisting of nonfunctional polysiloxanes, silanol terminated polysiloxanes, and alkoxy terminated polysiloxanes.
• the composition is substantially free of catalysts and initiators. In some embodiments, the composition comprises no greater than 5 wt.% solvent.
• the present disclosure provides a release coated substrate made according to any of the various methods of the present disclosure.
• the electron beam cured composition comprises a polysiloxane fluid having a kinematic viscosity at 25 of no greater than 50,000 centistokes, e.g., between 5,000 and 50,000 centistokes that has been crosslinked.
• the composition consists essentially of one or more nonfunctional polysiloxane fluids, each having a kinematic viscosity at 25 0 C of no greater than 50,000 centistokes, e.g., between 5,000 and 50,000 centistokes, wherein the polysiloxane fluids have been crosslinked.
• the composition comprises a silanol terminated polysiloxane fluid having a kinematic viscosity at 25 0 C of no greater than 50,000 centistokes, e.g., between 5,000 and 50,000 centistokes that has been crosslinked.
• the composition is substantially free of catalysts and initiators.
• FIG. 1 illustrates an exemplary release liner according to some embodiments of the present disclosure.
• PSAs Pressure sensitive adhesives
• a wide variety of PSA chemistries are available including, e.g., acrylic, rubber, and silicone based systems.
• Adhesives including PSAs are often used as free films or as supported films, e.g., single- and double-coated tapes.
• release liners are used to protective the adhesive layer during handling (e.g., processing, shipping, storing, and converting) and use (e.g., application to a substrate).
• Release liners typically comprise a substrate coated with a release material.
• the release liner is removed from the adhesive layer, exposing the adhesive layer so that it may adhered to the desired target substrate.
• the release liner may be reused, but is frequently discarded.
• an adhesive article may be self-wound.
• a substrate is coated on one side with a release material, with the adhesive bonded to the opposite side of the substrate.
• the adhesive When the article is wound upon itself (i.e., self wound), the exposed adhesive surface comes in contact with the release coated side of the substrate. In use, the roll is unwound, and the adhesive is applied to the desired target substrate.
• Crosslinked silicones have been used as release materials.
• Conventional silicone release materials are cured by thermal processes using specific types of catalysts.
• platinum catalysts have been used with addition cure systems
• peroxides e.g., benzoyl peroxide
• tin catalysts have been used with moisture/condensation cure systems.
• UV-cured and electron-beam cured silicone release materials have been used. These systems require the use of catalysts and specific functional groups. In particular, acrylate-functional and epoxy-functional silicones have been radiation cured in the presence of catalysts.
• the present inventors have discovered new methods for producing release layers, and release articles comprising such release layers.
• the methods include electron beam curing silicone materials to form a crosslinked polysiloxane network.
• the methods can be used with non-functional silicone materials.
• Functional silicone materials may also be used; however, as the specific functional groups are not typically involved in the crosslinking, the nature and presence of these functional groups is not critical.
• the methods of the present disclosure do not require the use of catalysts or initiators.
• the methods of the present disclosure can be used to cure compositions that are "substantially free” of such catalysts or initiators.
• a composition is “substantially free of catalysts and initiators” if the composition does not include an "effective amount" of a catalyst or initiator.
• an "effective amount" of a catalyst or initiator depends on a variety of factors including the type of catalyst or initiator, the composition of the curable material, and the curing method (e.g., thermal cure, UV-cure, and the like).
• a particular catalyst or initiator is not present at an "effective amount" if the amount of catalyst or initiator does not reduce the cure time of the composition by at least 10% relative to the cure time for same composition at the same curing conditions, absent that catalyst or initiator.
• the silicone materials useful in the present disclosure are polysiloxanes, i.e., materials comprising a polysiloxane backbone.
• the nonfunctionalized silicone materials can be a linear material described by the following formula illustrating a siloxane backbone with aliphatic and/or aromatic substituents:
• Rl, R2, R3, and R4 are independently selected from the group consisting of an alkyl group and an aryl group, each R5 is an alkyl group and n and m are integers, and at least one of m or n is not zero.
• one or more of the alkyl or aryl groups may contain a halogen substituent, e.g., fluorine.
• one or more of the alkyl groups may be -CH2CH2C4F9.
• R5 is a methyl group, i.e., the nonfunctionalized polysiloxane material is terminated by trimethylsiloxy groups.
• Rl and R2 are alkyl groups and n is zero, i.e., the material is a poly(dialkylsiloxane).
• the alkyl group is a methyl group, i.e., poly(dimethylsiloxane) ("PDMS").
• PDMS poly(dimethylsiloxane)
• Rl is an alkyl group
• R2 is an aryl group
• n is zero, i.e., the material is a poly(alkylarylsiloxane).
• Rl is methyl group and R2 is a phenyl group, i.e., the material is poly(methylphenylsiloxane).
• Rl and R2 are alkyl groups and R3 and R4 are aryl groups, i.e., the material is a poly(dialkyldiarylsiloxane).
• Rl and R2 are methyl groups, and R3 and R4 are phenyl groups, i.e., the material is poly(dimethyldiphenylsiloxane).
• the nonfunctionalized polysiloxane materials may be branched.
• one or more of the Rl, R2, R3, and/or R4 groups may be a linear or branched siloxane with alkyl or aryl (including halogenated alkyl or aryl) substituents and terminal R5 groups.
• nonfunctional groups are either alkyl or aryl groups consisting of carbon, hydrogen, and in some embodiments, halogen (e.g., fluorine) atoms.
• a “nonfunctionalized polysiloxane material” is one in which the Rl, R2, R3, R4, and R5 groups are nonfunctional groups.
• functional silicone systems include specific reactive groups attached to the polysiloxane backbone of the starting material (for example, hydroxyl and alkoxy groups).
• a "functionalized polysiloxane material” is one in which at least one of the R-groups of Formula 2 is a functional group.
• a functional polysiloxane material is one is which at least 2 of the R-groups are functional groups.
• the R-groups of Formula 2 may be independently selected.
• all functional groups are hydroxy groups and/or alkoxy groups.
• the functional polysiloxane is a silanol terminated polysiloxane, e.g., a silanol terminated poly dimethylsiloxane.
• the functional silicone is an alkoxy terminated poly dimethyl siloxane, e.g., trimethyl siloxy terminated poly dimethyl siloxane.
• the R-groups may be nonfunctional groups, e.g., alkyl or aryl groups, including halogenated (e.g., fluorinated) alky and aryl groups.
• the functionalized polysiloxane materials may be branched.
• one or more of the R groups may be a linear or branched siloxane with functional and/or non- functional substituents.
• the silicone materials may be oils, fluids, gums, elastomers, or resins, e.g., friable solid resins.
• fluids or oils e.g., ethylene glycol dimethacrylate
• resins e.g., friable solid resins.
• lower molecular weight, lower viscosity materials are referred to as fluids or oils, while higher molecular weight, higher viscosity materials are referred to as gums; however, there is no sharp distinction between these terms.
• Elastomers and resins have even higher molecular weights that gums, and typically do not flow.
• fluid and oil refer to materials having a dynamic viscosity at 25 0 C of no greater than 1,000,000 mPa » sec (e.g., less than 600,000 mPa » sec), while materials having a dynamic viscosity at 25 0 C of greater than 1,000,000 mPa » sec (e.g., at least 10,000,000 mPa » sec) are referred to as "gums”.
• low molecular weight silicone oils or fluids including those having a dynamic viscosity at 25 0 C of no greater than 200,000 mPa » sec, no greater than 100,000 mPa » sec, or even no greater than 50,000 mPa » sec.
• cSt centistokes
• silicone materials having a kinematic viscosity at 25 0 C of between 1000 and 50,000 cSt, e.g., between 5,000 and 50,000 cSt, or even between 10,000 and 50,000 cSt
• a commercially available was used to evaluate the release and readhesion properties associated with the various electron beam cured release coating.
• the adhesive (ADH) was a crosslinked acrylic copolymer. ADH is available as a 51 micrometer (2 mil) thick transfer tape under the trade designation 467MP from 3M Company.
• Non-functional Silicone Materials The following examples were prepared by electron beam curing non-functional silicone materials.
• Coating materials were prepared by dissolving DC-200 silicone fluid (30,000 cSt, from Dow Chemical Company) in heptane to produce a 30 wt.% solids solution. This coating was applied with a flat stiff blade at 70 kPa (10 psi) pressure onto a poly coated kraft paper substrate (58# PCK from Jencoat). The samples were dried at room temperature. The resulting samples had a dry coat weight of 0.6 to 0.8 gram/square meter (0.14 to 0.20 grains per four inch by six inch sample).
• the nonfunctional silicone material was electron beam cured according to the following procedure.
• the samples were cured using an acceleration voltage of 280 keV at various dosage levels.
• E-Beam Curing Procedure E-beam curing was performed on a Model CB-300 electron beam generating apparatus (available from Energy Sciences, Inc. (Wilmington, MA). Generally, a support film (e.g., polyester terephthalate support film) was run through the inerted chamber of the apparatus. Samples of uncured material were attached to the support film and conveyed at a fixed speed of about 6.1 meters/min (20 feet/min) through the inerted chamber and exposed to electron beam irradiation. For e-beam dosages of less than 18 Mrad, a single pass through the e-beam chamber was sufficient. To obtain higher dosages, e.g., 18 and 20 Mrad, two passes were required.
• a support film e.g., polyester terephthalate support film
• Adhesives applied to the cured release surface using both a "Dry Lamination” and "Wet-Cast” procedure were adhered to the transfer adhesive and pulled off to create the test samples. The adhesive side of the tape was then dry laminated onto the cured silicone coating of each sample using two passes of a 2 kg rubber roller. For the Wet Cast samples, the adhesives were cast directly on the cured silicone coatings of the examples and cured with ultraviolet radiation. A 50 micron (2.0 mil) primed PET film (product 3SAB from Mitsubishi) was then laminated to the cured adhesive to form the test samples.
• Table IB the electron beam dose, liner release and readhesion for the wet-cast samples are summarized in Table IB.
• the release and readhesion were measured initially and after a five day dwell of the adhesive against the release coating at 90 0 C and 90% relative humidity (90/90).
• Table IA Release and readhesion results for dry laminated samples.
• Table IB Release and readhesion results for wet cast samples.
• An acrylic foam tape (PTl 100, available from 3M Company) was used to evaluate the release and readhesion to stainless steel after a three day dwell at room temperature (3d-RT) and a three day dwell at 70 0 C (3d-HT).
• the adhesive was an acrylic/rubber blend. Release and readhesion was tested using a dry lamination process. First, the liner on the commercial PTl 100 acrylic foam tape was removed and the release force recorded. Readhesion to stainless steel of this 'as provided" material was also measured, for comparison purposes.
• Trimethyl siloxy terminated polydimethyl siloxane (DMS-T21, 100 cSt, from Gelest) was coated with a flat, stiff blade to a coat weight of 0.70 gram/square meter on a 115 micron (4.5 mil) thick polyethylene liner, which had been nitrogen corona treated at 0.71 Joule per square centimeter.
• the coated samples were electron beam cured in an inert atmosphere (less than 50 ppm oxygen) using an acceleration voltage of 250 keV.
• An acrylic foam tape (EX4011, available from 3M Company) was used to evaluate the release and readhesion to stainless steel after a seven day dwell at room temperature (7d-RT).
• the adhesive was an rubber/acrylic blend. Release and readhesion was tested using a dry lamination process. First, the liner on the commercial EX4011 acrylic foam tape was removed and the release force recorded. Readhesion to stainless steel of this 'as provided” material was also measured, for comparison purposes.
• the EX4011 acrylic foam tape adhesive was also dry laminated to a sample of silanol terminated polydimethyl siloxane (DMS-S42, 18,000 cSt, from Gelest) that was coated with a flat, stiff blade to a coat weight of 1.8 gram/square meter on a 115 micron (4.5 mil) thick polyethylene liner, which had been nitrogen corona treated at 0.71 Joule per square centimeter.
• the coated samples were electron beam cured in an inert atmosphere (less than 50 ppm oxygen) using an acceleration voltage of 250 keV and 16 Mrads.
• the 7d-RT release was 221 g/2.54 cm.
• the 7d-RT readhesion was 4560 gm/2.54 cm.
• the following comparative example was prepared by attempting to electron beam curing a hydride functional silicone fluid.
• Hydride terminated polydimethyl siloxane (DMS-H25, 500 cSt, from Gelest) was coated with a flat, stiff blade to a coat a 115 micron (4.5 mil) thick polyethylene liner, which had been nitrogen corona treated at 0.71 Joule per square centimeter.
• the coated samples were exposed to electron beam irradiation in an inert atmosphere (less than 50 ppm oxygen) using an acceleration voltage of 250 keV and dose of 16 Mrad. The sample did not cure.
• the following comparative example was prepared by attempting to electron beam curing a vinyl functional silicone fluid.
• Vinyl terminated polydimethyl siloxane (DMS-V42, 20,000 cSt, from Gelest) was coated with a flat, stiff blade to a coat a 115 micron (4.5 mil) thick polyethylene liner, which had been nitrogen corona treated at 0.71 Joule per square centimeter.
• the coated samples were exposed to electron beam irradiation in an inert atmosphere (less than 50 ppm oxygen) using an acceleration voltage of 250 keV and dose of 16 Mrad.
• the sample cured but did not anchor to the underlying polyethylene liner.
• the cured siloxane could be rubbed off the liner.
• the following comparative example was prepared by attempting to electron beam curing a carboxyalkyl functional silicone fluid.
• Carboxyalkyl terminated polydimethyl siloxane (DMS-B31, 800-1200 cSt, from Gelest) was coated with a flat, stiff blade to a coat a 115 micron (4.5 mil) thick polyethylene liner, which had been nitrogen corona treated at 0.71 Joule per square centimeter.
• the coated samples were exposed to electron beam irradiation in an inert atmosphere (less than 50 ppm oxygen) using an acceleration voltage of 250 keV and dose of 16 Mrad. The sample did not cure.
• Low kinematic viscosity sample The following comparative example was prepared by attempting to electron beam curing a low viscosity, low molecular weight silanol functional silicone fluid.
• Silanol terminated polydimethyl siloxane (DMS-S 12, 20 cSt, from Gelest) was coated with a flat, stiff blade to a coat a 115 micron (4.5 mil) thick polyethylene liner, which had been nitrogen corona treated at 0.71 Joule per square centimeter.
• the coated samples were exposed to electron beam irradiation in an inert atmosphere (less than 50 ppm oxygen) using an acceleration voltage of 250 keV and dose of 16 Mrad. The sample did not cure.
• Release liner 100 comprises substrate 120 with e-beam cured silicone release coating 130 associated with one major surface of substrate 120.
• a second e-beam cured release layer may be associated with the second major surface of the substrate, opposite the first e-beam cured silicone release coating.

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