US20110210517A1 - Sealing material and method of foaming application thereof - Google Patents

Sealing material and method of foaming application thereof Download PDF

Info

Publication number
US20110210517A1
US20110210517A1 US13/119,263 US200813119263A US2011210517A1 US 20110210517 A1 US20110210517 A1 US 20110210517A1 US 200813119263 A US200813119263 A US 200813119263A US 2011210517 A1 US2011210517 A1 US 2011210517A1
Authority
US
United States
Prior art keywords
sealing material
ultraviolet
sealing
foam
acrylate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/119,263
Other languages
English (en)
Inventor
Kazuyoshi Sekita
Hiroyuki Nakatani
Seiki Ueno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitta Gelatin Inc
Original Assignee
Nitta Gelatin Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nitta Gelatin Inc filed Critical Nitta Gelatin Inc
Assigned to NITTA GELATIN INC. reassignment NITTA GELATIN INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKATANI, HIROYUKI, SEKITA, KAZUYOSHI, UENO, SEIKI
Publication of US20110210517A1 publication Critical patent/US20110210517A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions 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; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—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
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0053—Producing sealings
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/48—Macromolecular compounds
    • C04B41/483—Polyacrylates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
    • C04B41/61—Coating or impregnation
    • C04B41/62—Coating or impregnation with organic materials
    • C04B41/63—Macromolecular compounds
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • 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
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/026—Crosslinking before of after foaming
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • 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
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2003/1034—Materials or components characterised by specific properties
    • C09K2003/1062—UV-curable materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
    • C09K2200/0615—Macromolecular organic compounds, e.g. prepolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C09K2200/0625—Polyacrylic esters or derivatives thereof

Definitions

  • the present invention relates to a sealing material and a method of foaming application thereof.
  • the invention relates to: a sealing material which is hot-melting and ultraviolet-curable and is favorably used particularly as a foamable one; and a method of foaming application of the sealing material.
  • a gasket-composite material utilizing a resin composition obtained by pressure-injecting an inert gas into a composition comprising an ethylenically unsaturated compound and a near-infrared photopolymerization initiator to thus foam the composition into the form of a shake (refer to patent document 1 below).
  • a resin composition obtained by pressure-injecting an inert gas into a composition comprising an ethylenically unsaturated compound and a near-infrared photopolymerization initiator to thus foam the composition into the form of a shake.
  • a foamed and cured material usable as a foamed gasket material there is known a technique in which a predefined foamable polysiloxane composition is used and is irradiated with ultraviolet rays at the same time as being applied, so that the foaming and the curing are caused at the same time (refer to patent document 2 below).
  • the ultraviolet irradiation is not uniform when the aforementioned composition is used, then there is a problem that the foam density or foamed condition is not stable, and further, since the aforementioned composition is liquid, the composition cannot be left applied, so that there is worry that the composition might flow before curing, and that as result, the foaming and curing are caused in the flowed condition.
  • a foaming-type sealing composition comprising a rubbery organic polymer having at least one reactive silicon group, a silanol condensation catalyst for curing this polymer, and an organic pyrolyzing type foaming agent (refer to patent document 4 below).
  • a rubbery organic polymer having at least one reactive silicon group a silanol condensation catalyst for curing this polymer
  • an organic pyrolyzing type foaming agent (refer to patent document 4 below).
  • thermosetting facilities in a line in order to carry out foaming by utilizing the thermosetting or pyrolyzability, so that the line constitution is limited.
  • thermoplastic elastomer As a hot-melt sealing material, there is known a lap joint type pre-sealing material comprising a mixture of such as a thermoplastic elastomer, a tackifier resin and a wax (refer to patent document 5 below).
  • a thermoplastic elastomer does not have any crosslinked structure, so that when exposed to heat resistance, the sealing material might melt out.
  • a reactive type hot-melt composition which comprises a predefined urethane prepolymer and a predefined copolymer and further comprises a predefined thermoplastic elastomer in order to prevent foaming during the curing (refer to patent document 6 below).
  • the moisture curing is applied as the aforementioned curing reaction.
  • gelation might occur, or an unreacted component of a diisocyanate compound which is used as a raw material for the urethane polymer might be discharged into the air, and besides, there is also worry that a difference in the adhesive property might be made due to the difference in temperature or humidity between winter and summer.
  • a difference in the adhesive property might be made due to the difference in temperature or humidity between winter and summer.
  • the moisture in the air is completely shut down in order to enhance the heating stability, such cases result in the use under high pressure and are therefore unfavorable in respect to the safety.
  • a ultraviolet-curable hot-melt sealing material which comprises a predefined ultraviolet-curable component, a predefined tackifier resin and a predefined thermoplastic elastomer and is provided with an ultraviolet polymerization initiator (refer to patent document 7 below).
  • the sealing material which is excellent also in heat resistance is assumed to be obtained.
  • the heat resistance as referred to therein is on the assumption of a condition of about 80° C. Therefore, if this sealing material is left under severer heat resistance conditions (e.g. not lower than 100° C.) after cured, then the adhesion performance and the compression-set become worse, so that the degradation of the sealing performance is unavoidable.
  • objective problems that the present invention is to solve are: to provide a sealing material which does not involve flowing after applied, and shows an excellent sealing performance even under severe heat resistance conditions, and also can make good independent cells inside even when used in a foamed condition; and to provide a method of foaming application of the sealing material.
  • the present inventors diligently studied to solve the above objective problems.
  • thermoplastic elastomer is not ultraviolet-curable and therefore its thermoplastic property remains even after applying of the sealing material, so that the heat resistance of the sealing material becomes worse. Therefore, they have studied whether the amount of the thermoplastic elastomer which is not ultraviolet-curable and causes the inferiority of the heat resistance can be reduced in order to more enhance the heat resistance.
  • an acrylate having a glass transition temperature of ⁇ 70 to 0° C. after ultraviolet curing can provide a sealing material with softness and a hot-melting property (i.e. a property to melt by heating and to solidify by cooling), so that this acrylate having a glass transition temperature of ⁇ 70 to 0° C. after ultraviolet curing can be used as a substitute component for the thermoplastic elastomer.
  • the acrylate having a glass transition temperature of ⁇ 70 to 0° C. after ultraviolet curing needs to have a weight-average molecular weight of 500 to 50,000, and further that the sealing material needs to have a melt-viscosity at 120° C.
  • the aforementioned acrylate is curable by ultraviolet rays, high heat resistance can be ensured, so that there does also not occur the problem of the heat resistance degradation caused in the case of using the thermoplastic elastomer which is not ultraviolet-curable.
  • the aforementioned sealing material also can make good independent cells even when used for foamable sealing, and therefore, does not only have high heat resistance, but also has excellent sealing performance such as air tightness and water tightness.
  • the present invention has been completed by the above-mentioned findings and their confirmation.
  • a sealing material according to the present invention is characterized by comprising an ultraviolet-curable component and an ultraviolet polymerization initiator, wherein in cases where the sealing material further comprises a thermoplastic elastomer which is not ultraviolet-curable, its content is not higher than 5 weight % based on the total amount of the resin components, and wherein the sealing material comprises an acrylate as the ultraviolet-curable component in a ratio of not less than 50 weight % based on the total amount of the resin components wherein the acrylate has a weight-average molecular weight of 500 to 50,000 and has a glass transition temperature of ⁇ 70 to 0° C. after ultraviolet curing, and wherein the sealing material has a melt-viscosity at 120° C. of 1,000 to 50,000 mPa ⁇ s.
  • a method according to the present invention of foaming application of a sealing material comprises the steps of: hot-melting the sealing material; mixing a pressurized inert gas into the melted sealing material; discharging the melted sealing material containing the pressurized inert gas into the air to thus foam the sealing material and simultaneously apply it to a place necessary to seal, thus making a sealing foam; and irradiating this sealing foam with ultraviolet rays, thus curing the sealing material; wherein the method is characterized in that: the mixing of the inert gas is carried out by: using nitrogen gas as the inert gas; pressurizing the nitrogen gas into a pressure of 0.01 to 0.1 MPa; and blowing the pressurized nitrogen gas into the sealing material; and the applying of the sealing material is carried out at a discharging pressure of 2.7 to 9.7 MPa.
  • the sealing material according to the present invention can be provided with the softness and the hot-melting property without using any thermoplastic elastomer which is not ultraviolet-curable, and can be prevented from flowing due to fast cooling solidification based on the hot-melting property, and also can be enhanced in respect to the heat resistance due to the reduction of the amount of the aforementioned thermoplastic elastomer which is not ultraviolet-curable being used.
  • the aforementioned sealing material according to the present invention can be used both for non-foamable sealing and for foamable sealing, but can make good independent cells inside while little involving the foam breakage even when used for foamable sealing, and therefore, does not only have high heat resistance, but also has excellent sealing performance such as air tightness and water tightness. Since the ultraviolet-curable component can be cured in a short time, the independent cells can be ensured even at a comparatively low viscosity.
  • the method according to the present invention of foaming application of a sealing material uses the best applying conditions when applying the sealing material in a foamed condition, this method can particularly well form independent cells.
  • FIG. 1 is a perspective view of a seal-treated construction exterior panel which illustrates an embodiment of the present invention.
  • FIG. 2 is a sectional view of sealing parts in an applied condition of the construction exterior panels.
  • FIG. 3 is a schematic structural view illustrating a sealing treatment process.
  • symbol 10 represents a construction exterior panel
  • symbols 12 and 14 represent sealing surfaces
  • symbol 20 represents a sealing material
  • symbol 30 represents a discharging nozzle
  • symbol 40 represents an ultraviolet lamp.
  • the sealing material according to the present invention cannot only be used for non-foamable sealing, but also can be used for foamable sealing.
  • sealing materials are classified into hot-melting (hot-melt type) sealing materials, moisture-curable sealing materials, and ultraviolet-curable sealing materials, according to differences in curing mechanism for curing the sealing material after having formed a sealing matter by applying the sealing material to a place needing to be sealed.
  • the sealing material according to the present invention is a hot-melting and ultraviolet-curable sealing material.
  • the sealing material according to the present invention is used in a melted condition resultant from hot-melting.
  • the curing after having formed the sealing matter by applying (discharging) the melting-conditioned sealing material, is carried out in combination of both mechanisms of the cooling solidification and the ultraviolet curing.
  • the basic shape or structure of the sealing matter is determined by cooling, and thereafter the ultraviolet curing proceeds in the inside of the sealing matter.
  • the sealing material according to the present invention is usually applied to a sealing treatment in which the sealing foam is formed by foaming the sealing material during its use.
  • the sealing material according to the present invention comprises an ultraviolet-curable component and an ultraviolet polymerization initiator, wherein in cases where the sealing material further comprises a thermoplastic elastomer, its content is not higher than 5 weight % based on the total amount of the resin components, and wherein the sealing material essentially comprises the below-mentioned predefined acrylate as the aforementioned ultraviolet-curable component.
  • the ultraviolet-curable component is an ultraviolet-curable compound or composition which cures due to ultraviolet irradiation.
  • this ultraviolet-curable component there is essentially contained an acrylate having a glass transition temperature of ⁇ 70 to 0° C. after ultraviolet curing.
  • an additional ultraviolet-curable component there is further contained an acrylate having a glass transition temperature of not lower than 10° C. before ultraviolet curing.
  • the acrylate having a glass transition temperature of ⁇ 70 to 0° C. after ultraviolet curing might be expressed as “low-Tg acrylate”, and the acrylate having a glass transition temperature of not lower than 10° C. before ultraviolet curing might be expressed as “high-Tg acrylate”.
  • the “acrylate” in the present invention is a conception which is not limited to monoacrylates, but also include polyfunctional acrylates. Therefore, the “acrylate” in the present invention can be said to be that which contains one or more acryloyl groups per molecule. If the “acrylate” in the present invention is irradiated with ultraviolet rays, then the aforementioned acryloyl group acts as a reaction site to thus make a crosslinked structure. Therefore, as the number of the acryloyl groups becomes larger, the crosslinking becomes closer, so that the sealing material becomes more excellent in the heat resistance. However, if the number of the acryloyl groups is too large, then the softness decreases. From such a viewpoint, the number of the acryloyl groups per molecule is favorably in the range of 2 to 5.
  • the use of at least one kind is enough, but the use of two or more kinds is also not hindered.
  • the high-Tg acrylate is used together with the low-Tg acrylate
  • such cases are not limited to the use of one kind of high-Tg acrylate, but two or more kinds of high-Tg acrylates may be used together with the low-Tg acrylate.
  • one kind or two or more kinds of acrylates other than the high-Tg acrylate and the low-Tg acrylate may be used together with the low-Tg acrylate.
  • the weight-average molecular weight of the low-Tg acrylate according to the present invention needs to be in the range of 500 to 50,000 and is preferably in the range of 500 to 30,000.
  • the weight-average molecular weight is preferably in the range of 500 to 50,000 and is more preferably in the range of 500 to 30,000. If the molecular weight is too large, then the viscosity might become high, so that the application performance might become inferior. If the molecular weight is too small, then the viscosity might become low, so that the flowing might easily occur and, in cases where the sealing material is used for foamable sealing, the foam breakage might easily occur and a good independent-cell matter might become difficult to obtain.
  • the low-Tg acrylate has a glass transition temperature of ⁇ 70 to 0° C. after ultraviolet curing. If the glass transition temperature after ultraviolet curing is higher than 0° C., it might be impossible to provide enough softness, so that the compression-set might be lower. If the glass transition temperature after ultraviolet curing is lower than ⁇ 70° C., the viscosity might become too low, so that the flowing might occur and further, also in cases where the sealing material is used for foamable sealing, the foam breakage might easily occur and a good independent-cell matter might become difficult to obtain.
  • the glass transition temperature after ultraviolet curing is preferably in the range of ⁇ 50 to 0° C.
  • the low-Tg acrylate is not especially limited. However, examples thereof include: those which are obtained by introducing an acryloyl group into a molecule by utilizing isocyanate groups of an urethane prepolymer obtained by a reaction between a low-Tg polyester-polyol or polyether-polyol and an isocyanate; those which are obtained by introducing an acryloyl group into a molecule by utilizing an oxirane ring of an epoxy resin; and those which are obtained by grafting an acryloyl group onto a side chain of a copolymer of comonomers one of which is n-butyl acrylate (n-BA).
  • the high-Tg acrylate which is favorably used together with the low-Tg acrylate as the ultraviolet-curable components has a glass transition temperature of not lower than 10° C. before ultraviolet curing.
  • the melt viscosity at 120° C. of the sealing material can be increased, so that the flowing can remarkably be prevented and also that even in cases where the sealing material is used for foamable sealing, the foam breakage can be prevented so remarkably as to easily obtain good independent cells and also the tackiness of the sealing material can be enhanced. If the aforementioned glass transition temperature is lower than 10° C., then it might become impossible to provide the aforementioned effects enough.
  • the aforementioned glass transition temperature is favorably not higher than 100° C. and more favorably in the range of 20 to 80° C.
  • the high-Tg acrylate is not especially limited. However, examples thereof include: oligomers obtained by grafting an acryloyl group onto a side chain of a copolymer of comonomers one of which is methyl methacrylate (MMA); those which are obtained by introducing an acryloyl group into a side chain of a rosin ester; those which are obtained by grafting an acryloyl group by utilizing a phenolic hydroxyl group of a terpene phenol resin; and those which are obtained by introducing an acryloyl group by utilizing a residue of a non-reactive tackifier resin.
  • MMA methyl methacrylate
  • the ratio between the low-Tg acrylate and the high-Tg acrylate depends on their respective glass transition temperatures, but is, for example, favorably in the range of 90:10 to 60:40 and more favorably in the range of 80:20 to 70:30.
  • the ultraviolet-curable component may include known other ultraviolet-curable compounds besides the above specific acrylates.
  • the above other ultraviolet-curable compounds are not especially limited. However, for example, the below-explained cationic polymerization type ultraviolet-curable compounds are favorably used.
  • epoxidized compounds of known or commercially available various kinds of liquid polydienes can be used. Specific examples thereof include: those which are obtained by setting-in an epoxy group into such as polydiene compounds having a 1,2-polybutadiene conformation synthesized by anionic living polymerization technique or their hydrogenated products; those which are obtained by setting-in an epoxy group into polydiene compounds produced by radical polymerization; and those which are obtained by setting-in an epoxy group into molecules of liquid polydiene type oligomers by reactions between a terminal end group of the liquid polydiene type oligomers and an epoxy group of such as epoxy resins.
  • the epoxy resins are those which have two or more epoxy groups per molecule.
  • Examples of commercially available products of the ultraviolet-curable compounds having an epoxy group include: trade name “R-45EPT” produced by Nagase ChemteX Corporation; trade name “PB-3600” produced by Daicel Chemical Industries, Ltd.; and trade name “L-207” produced by Craton Performance Polymers, Inc.
  • the weight-average molecular weight of the ultraviolet-curable compound having an epoxy group is not especially limited. However, it is in the range of 100 to 50,000, favorably 100 to 30,000, more favorably 100 to 20,000. If the molecular weight is too high, then the operation property is inferior, so that the application property of the sealing material is not good. If the molecular weight is too low, then enough softness is not obtained, so that the sealing performance is degraded.
  • the ultraviolet-curable component may only comprise the aforementioned ultraviolet-curable compounds, but may be a composition obtained by taking these compounds in combination with such as epoxy resins.
  • Examples of the aforementioned epoxy resins include the following ones.
  • Glycidyl type epoxy resins can be used. Specific examples thereof include: bisphenol A types; bisphenol F types; bisphenol S types; flame retardant types of tetrabromobisphenol A; phenol novolac types; cresol novolac types; hydrogenated bisphenol A types; and propylene oxide or ethylene oxide adducts of bisphenol A types.
  • Glycidyl ester type epoxy resins can be used. Specific examples thereof include: diglycidyl ester of hexahydrophthalic acid; and diglycidyl esters of dimer acids.
  • Glycidyl amine type epoxy resins can be used. Specific examples thereof include: triglycidyl isocyanate; and tetraglycidyldiaminodiphenylmethane.
  • Linear aliphatic epoxy resins can be used. Specific examples thereof include: epoxidized polybutadiene; and epoxidized soy bean oil.
  • Alicyclic epoxy resins can be used. Specific examples thereof include: alicyclic diepoxyacetals; alicyclic diepoxyadipates; alicyclic diepoxycarboxylates; and vinylcyclohexene oxide.
  • the ultraviolet polymerization initiator when the ultraviolet-curable component is cured, the ultraviolet polymerization initiator is used.
  • a radical ultraviolet polymerization initiator is used.
  • radical ultraviolet polymerization initiator known ones can be used adequately.
  • specific examples thereof include: benzoins such as benzoin, benzoin methyl ether and benzoin ethyl ether, and their alkyl ethers; acetophenones such as acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1,1-dichloroacetophenone and 4-(1-t-butyldioxy-1-methylethyl)acetophenone; anthraquinones such as 2-methylanthraquinone, 2-amylanthraquinone, 2-t-butylanthraquinone and 1-chloroanthraquinone; thioxanthones such as 2,4-dimethylthioxanthone, 2,4-diisopropylthioxanthone and 2-chlorothioxanthone; ketals such as acetophenone dimethyl ketal and benzyl dimethyl
  • Examples of commercially available products of the radical polymerization initiator include trade name “Irgacure 184” produced by Ciba-Geigy AG.
  • cationic ultraviolet polymerization initiators are properly selected and used according to the materials or composition formulations used for the cationic polymerization type ultraviolet-curable compounds.
  • onium salts can be used as the cationic ultraviolet polymerization initiators.
  • the onium salts are organic salts comprising onium ions and anions and generate Lewis acids and Br ⁇ nsted acids (protonic acid) by ultraviolet irradiation.
  • onium salts include diphenyl iodonium, 4-methoxydiphenyl iodonium, bis(4-methylphenyl) iodonium, bis(4-tert-butylphenyl) iodonium, bis(dodecylphenyl) iodonium, tricummyl iodonium, triphenyl sulfonium, bis(4-(diphenylsulfonio)-phenyl) sulfide, bis(4-(di(4-(2-hydroxyethyl)phenyl)sulfonio)-phenyl) sulfide, and ⁇ 5-2,4-(cyclopentadienyl)(1,2,3,4,5,6- ⁇ -(methylethyl)benzene)-iron (1+).
  • anions include tetrafluoroborate, tetrakis(pentafluorophenyl)borate, hexafluorophosphate, hexafluoroantimonate, hexafluoroarsenate and hexachloroantimonate.
  • Examples of commercially available products of the cationic polymerization initiator include trade name “Adekaoptomer SP-150” produced by ADEKA Co., Ltd.
  • a sensitizer may be used.
  • the sensitizer include: unsaturated ketones represented by such as chalcone derivatives and dibenzalacetone; 1,2-diketone derivatives represented by such as benzyl and camphorquinone; benzoin derivatives; fluorene derivatives; naphthoquinone derivatives; anthraquinone derivatives; xanthene derivatives; thioxanthene derivatives; xanthone derivatives; thioxanthone derivatives; coumarin derivatives; ketocoumarin derivatives; cyanine derivatives; merocyanine derivatives; polymethine dyes such as oxonol derivatives; acridine derivatives; azine derivatives; thiazine derivatives; oxazine derivatives; indoline derivatives; azulene derivatives; azulenium derivatives; squalirium derivatives; porphyrin derivatives; t
  • the tackiness can be provided to the sealing material by adding thereto the above-mentioned low-Tg acrylate, and particularly, the aforementioned tackiness also can further be enhanced by using the high-Tg acrylate together with the low-Tg acrylate. Therefore, even if the below-explained tackifier resins are not used, that will do.
  • tackifier resins which are utilized for conventional sealing materials, particularly, hot-melt type sealing materials, can be used.
  • tackifier resins include: rosins, modified (e.g. hydrogenated) rosins, and rosin derivatives which are their esterified products; terpene type resins which are polymers of terpenes such as ⁇ -/ ⁇ -pinene and dipentene; modified terpene resins such as terpene phenol resins; coumarone indene resins; and various kinds of aliphatic, alicyclic and aromatic hydrocarbon resins, and their hydrogenated resins.
  • thermoplastic elastomers which are utilized for conventional hot-melt type sealing materials can be used.
  • the hot-melting property and the softness can be provided by the low-Tg acrylate, and particularly, the aforementioned hot-melting property also can further be enhanced by using the high-Tg acrylate together with the low-Tg acrylate. Therefore, even if the below-explained thermoplastic elastomers are not used, that will do.
  • thermoplastic elastomer is not especially limited.
  • thermoplastic block copolymers having two or more of polystyrene blocks and one or more of elastic polymer blocks can be used.
  • Specific examples include styrene-butadiene block copolymers (SBS) and their hydrogenated products (SEBS), and styrene-isoprene block copolymers (SIS).
  • SBS styrene-butadiene block copolymers
  • SEBS hydrogenated products
  • SIS styrene-isoprene block copolymers
  • Thermoplastic elastomers obtained by grafting an epoxy group or carboxyl group onto the above elastomers can also be used.
  • paraffins comprising a major proportion of n-paraffins or iso-paraffins as contained in crude petroleum residue during petroleum purification
  • microcrystalline wax montan wax produced from montanic acid which is an extract from coal
  • carnauba wax obtained from Copernica cerifera Mart candelilla wax obtained from grass stalks.
  • synthetic waxes include polyethylene wax produced from ethylene.
  • waxes preferably used of the above ones include paraffins, microcrystalline, Fischer-Tropsch, various kinds of low-molecular polyethylene waxes, some of modified waxes, and atactic polypropylene.
  • the natural waxes have a molecular weight of 300 to 800, so that their melting points are also low.
  • the synthetic waxes the polymerization degree can freely be changed, so that the melting point becomes higher by the difference in molecular weight.
  • many of the synthetic waxes have a molecular weight in the range of about 1,000 to about 10,000.
  • the above-mentioned component materials are mixed together in their respective proper amounts.
  • the ultraviolet-curable component is contained favorably in a major proportion, specifically, in a ratio of not less than 90 weight % based on the total amount of the resin components.
  • the low-Tg acrylate which is essentially used as an ultraviolet-curable component needs to be contained in a ratio of not less than 50 weight % based on the total amount of the resin components. If the ratio of the low-Tg acrylate is less than 50 weight %, then the low-Tg acrylate cannot sufficiently be substituted for the performances (e.g. hot-melt property, softness) of the thermoplastic elastomer.
  • thermoplastic elastomer which is not ultraviolet-curable In cases where the thermoplastic elastomer which is not ultraviolet-curable is also used, this component has a great influence on the degradation of the heat resistance, so that the amount of the thermoplastic elastomer which is not ultraviolet-curable needs to be not higher than 5 weight % based on the total amount of the resin components.
  • the tackifier resin which is not ultraviolet-curable in cases where the tackifier resin which is not ultraviolet-curable is also used, its amount is favorably not higher than 5 weight % based on the total amount of the resin components, and also in cases where the wax is also used, its amount is favorably not higher than 5 weight % based on the total amount of the resin components. Also as to these components, if their respective amounts are too large, then the heat resistance degradation might be caused.
  • the ultraviolet polymerization initiator is contained, for example, in an amount of 0.1 to 10 weight % based on the ultraviolet-curable component.
  • the hot-melting temperature can be set in the range of 30 to 130° C.
  • the melt-viscosity at 120° C. needs to be in the range of 1,000 to 50,000 mPa ⁇ s. If the melt-viscosity at 120° C. is in the aforementioned range, then the flowing does not occur, and even in cases where the sealing material is used for foamable sealing, the foam breakage does not occur, so that good independent cells can be produced.
  • the melt-viscosity at 120° C. is favorably in the range of 1,000 to 30,000 mPa ⁇ s and more favorably in the range of 1,000 to 20,000 mPa ⁇ s.
  • the melt-viscosity at 120° C. can easily be set in the aforementioned ranges by properly determining such as glass transition temperature or weight-average molecular weight of the acrylate and the content of the tackifier resin or thermoplastic elastomer.
  • the sealing material according to the present invention can be used further with additives added thereto according to such as purpose of the use of the sealing material, wherein the additives are, for example, as follows: dyes; organic and inorganic pigments; deoxidants or reductants such as phosphines, phosphonates and phosphites; seam inhibitors; discoloring inhibitors; halation inhibitors; fluorescent brightening agents; surfactants; colorants; fillers; plasticizers; flame retardants; antioxidants; ultraviolet absorbents; antimolds; antistatic agents; magnetic matters; and other additives for providing various properties.
  • the sealing material also can be used with such as diluting solvents mixed therewith.
  • the sealing material is supplied to a member for providing the sealing performance or to a place needing to be sealed of apparatus and devices, for example, to a sealing surface, thereby forming a sealing matter on the sealing surface, and then the sealing matter as placed on the sealing surface contacts with a sealing surface of another member, so that the sealing performance is performed.
  • an application method comprising the following steps can be adopted.
  • a foaming application method for applying the sealing material in a foamed condition is explained in detail.
  • the blowing-in of the inert gas is not carried out.
  • a pressurized inert gas is blown into a hot-melted sealing material. This is a step which is also applied to conventional hot-melt type sealing materials, so that the same treatment devices and conditions can be applied.
  • the sealing material is usually solid at normal temperature and is therefore beforehand hot-melted in order to have a liquidity. Specifically, when the sealing material is hot-melted, the heating temperature of the sealing material can be set in the range of 30 to 130° C.
  • the pressurized inert gas is blown into the melted sealing material.
  • the inert gas such as nitrogen gas or carbon dioxide can be used.
  • the gas is favorably fed in a condition pressurized into a pressure of 0.01 to 0.1 MPa (gas cylinder pressure). If the gas cylinder pressure is too low, then it might be impossible to obtain enough foamability. If the gas cylinder pressure is too high, then it is difficult to obtain uniform independent cells.
  • the hot-melting of the sealing material and the blowing-in of the inert gas are usually carried out before the below-mentioned discharging of the sealing material.
  • the blowing-in of the inert gas also can be carried out just before or at the same time as the discharging of the sealing material.
  • the sealing material also can be discharged while the inert gas is blown into the sealing material.
  • the sealing material also can be discharged by the pressurizing force due to the blowing-in of the inert gas.
  • This step (a) and the next step (b) may be carried out as separate steps, or there is a case where these steps are carried out as the same step or carried out simultaneously or continuously with the same apparatus.
  • the melted sealing material containing the pressurized inert gas is discharged into the air to thus foam the sealing material and simultaneously apply it to a place necessary to seal, thus making a sealing foam. This is the same operation as that for conventional hot-melt type sealing materials, so that the same treatment devices and conditions can be applied.
  • the discharging pressure is not especially limited. However, the discharging pressure is favorably in the range of 2.7 to 9.7 MPa. If the discharging pressure is too low, then the foam density might be low, so that the resultant foam might lack elasticity and therefore have a low sealing property, and further that occasionally, a stress more than necessary might unfavorably be applied to a place to be sealed. On the other hand, the discharging pressure is too high, then the foam breakage might be caused, so that it might be impossible to obtain any independent cell.
  • the melted sealing material as discharged into the air resides on a sealing surface in the form of a block having a predefined thickness or sectional shape and is solidified by cooling.
  • the pressurized inert gas expands to cause a foaming phenomenon which forms fine cells or hollows in the inside of the sealing material.
  • the foam density of the sealing foam as obtained by foaming the sealing material is favorably set in the range of 2 to 4 densities.
  • the foam density makes differences in respect to the softness, elasticity and sealing performance of the finally obtained sealing foam. If the foam density is too low, then enough deformability cannot be provided. If the foam density is too high, then the deformability is too much, so that enough sealing performance cannot be performed.
  • sealing material has been cool-solidified by leaving the sealing foam, then the same sealing foam as conventional hot-melt type sealing material is formed.
  • an ultraviolet irradiation treatment is carried out.
  • a continuous material of the discharged sealing material that is, a sealing foam
  • the sectional area and shape of the sealing foam being formed can be adjusted by adjusting the running speed of the sealing surface and the shape and discharging amount of the nozzle for discharging the sealing material.
  • the sealing material as applied to the sealing surface while being foamed in the aforementioned step (b), that is, the sealing foam, is immediately irradiated with ultraviolet rays and thereby cured.
  • the ultraviolet irradiation As to the discharged foaming of the sealing material and the ultraviolet irradiation thereto, there is a case where they are substantially simultaneously started. Or the ultraviolet irradiation also can be carried out after the discharging and foaming of the sealing material have been carried out enough.
  • ultraviolet rays to be irradiated ultraviolet rays having a wavelength of 200 to 400 nm can be irradiated at an irradiation intensity of 1 to 10,000 mW/cm 2 .
  • ultraviolet rays can be irradiated by an ultraviolet irradiation means as set with fixation.
  • the irradiation dose per unit time and the irradiation time can be adjusted by adjusting the running speed of the sealing surface and the intensity of the ultraviolet rays.
  • an ultraviolet irradiation lamp or ultraviolet beam is moved in a condition where the sealing foam remains fixed.
  • the ultraviolet-curable hot-melt type sealing material and the foaming application method, according to the present invention can be applied to the same uses as those of conventional hot-melt type sealing materials and ultraviolet-curable type sealing materials.
  • the sealing material according to the present invention can show excellent performance. Even under environments which cannot avoid the contact with water such as water wetting and under environments which are put in a high-temperature condition much exceeding normal temperature, the sealing material according to the present invention shows excellent sealing performance.
  • examples of uses of the sealing material according to the present invention include the following:
  • housing seals for lamps such as headlamps, door modules, and interior seals;
  • construction materials for example, seal parts of exterior panels constituting exterior walls, seal parts of roof materials, and lap joint parts of such as metal sizing materials;
  • FIGS. 1 and 2 show a case where a sealing material has been applied to sealing parts of construction exterior panels to be applied onto such as exterior walls of constructions.
  • the construction exterior panel 10 comprising such as light-weight concrete panels has, in face-to-face side edge parts, bump-shaped notches to be joint parts for connection, and the surfaces of the bump parts are to be the sealing surfaces 12 and 14 . Since the bump shapes are reverse in front and back relations at the face-to-face side edges, the sealing surface 12 and the sealing surface 14 are reverse in front and back relations.
  • Such a connection structure in which the sealing surfaces 12 and 14 face with each other might be called lap joint.
  • the bead-shaped sealing foam 20 continuous along the longitudinal direction is applied onto the sealing surface 12 exposed to the front side of the construction exterior panel 10 .
  • the sealing foam 20 has an approximately semicircular sectional shape.
  • the construction exterior panels 10 are applied onto the construction substrate material 16 by sticking.
  • the construction exterior panels 10 are applied from side to side in sequence.
  • Onto the sealing surface 12 of the construction exterior panel 10 there is face-to-face placed the back-oriented sealing surface 14 of the construction exterior panel 10 being adjacently applied.
  • the sealing surface 14 contacts with the sealing foam 20 and presses it downward.
  • the sealing foam 20 softly deforms and thereby adheres to the sealing surface 14 , so that the sealing performance is shown.
  • the sealing foam 20 is required to have such as heat resistance, water resistance and temperature change resistance to outdoor environment.
  • the above-mentioned application of the sealing foam 20 onto the construction exterior panels 10 also can be carried out in application fields of constructions, but it is effective that the application is beforehand carried out in such as production factories for the construction exterior panels 10 .
  • FIG. 3 shows a applied condition of the sealing foam 20 in such as production factories for the construction exterior panels 10 .
  • the construction exterior panel 10 is continuously run using such as conveyor apparatus in a condition where the sealing surface 12 is set upward. Though drawing is omitted, on the upstream side of the running course, there may be set a producing step or processing step for the construction exterior panels 10 . Also on the downstream side of the running course, there may be set another processing step of treating step for the construction exterior panels 10 . Shown in FIG. 3 is a condition where the sealing treatment step is incorporated on the way of the production line for the construction exterior panels 10 .
  • the discharging nozzle 30 is a part of an applicator apparatus, of which the drawing has been omitted, and is connected with a reservoir tank for the sealing material 22 , wherein the tank is provided to the applicator apparatus.
  • the sealing material 22 is heated by such as heater into a melted condition in the reservoir tank or in the course of from the reservoir tank to the discharging nozzle 30 .
  • Pressurized nitrogen gas is blown into the melting-conditioned sealing material 22 .
  • the sealing material 22 can be heated to 120° C., and thereinto, nitrogen gas can be blown at a pressure of 29 kPa.
  • Foam Melt Applicator FM-151 Model (trade name, produced by Nordson Corporation) can be used.
  • nitrogen gas is blown into the hot-melted sealing material 22 mechanically with a particular gear pump and discharged into the air and thereby foamed.
  • the melted sealing material 22 as discharged onto the sealing surface 12 of the running construction exterior panel 10 results in forming a continuous bead on the sealing surface 12 .
  • the running speed of the sealing surface 12 can be set for 15 m/min.
  • the sealing material 22 being put under normal pressure is foamed by expansion of the pressurized nitrogen gas, so that independent cells are formed in the inside of the sealing material 22 .
  • the heated sealing material 22 rapidly cools and solidifies, the aforementioned bead shape remains kept, so that the sealing material 22 does not extend over a wide range of the sealing surface 12 in the form of a liquid.
  • the foaming phenomenon can promote the cooling and thereby can rapidly solidify the sealing material 22 in a proper bead shape.
  • the ultraviolet irradiation lamp 40 is irradiated to the sealing foam 20 formed from the sealing material 22 .
  • the ultraviolet curing occurs in the inside of the sealing foam 20 .
  • the conditions of the ultraviolet irradiation can be set so that ultraviolet rays having a wavelength of 200 to 400 nm are irradiated at an irradiation intensity of 2,000 mW/cm 2 to expose each part of the running sealing foam 20 to the ultraviolet rays for 30 seconds.
  • UV irradiation system trade name “Light Hammer 6” produced by Fusion UV Systems, Japan, K.K. can be used.
  • the sealing material 22 contains the ultraviolet-curable component and the ultraviolet polymerization initiator, the curing rapidly proceeds due to the ultraviolet irradiation.
  • Each part of the sealing material 22 only passes the irradiation region of the ultraviolet irradiation lamp 40 in a short time, but sufficiently undergoes the action of the ultraviolet rays, so that the ultraviolet curing is rapidly started, and further that the ultraviolet curing rapidly proceeds from the surface to inside of the sealing foam 20 and, as a result, the ultraviolet curing rapidly proceeds throughout the entirety of the sealing foam 20 having some degree of thickness.
  • the construction exterior panels 10 having passed the position of the ultraviolet irradiation lamp 30 also can be fed out to the next treatment step or subjected to a shipping or safekeeping work.
  • the sealing foam 20 on the sealing surface 12 has enough shape retainability, and its surface does not have strong stickiness, and even if the surface is subject to the touch or to the contact with another object, the shape is not deformed, or damage is not done.
  • the ultraviolet-curable component and the ultraviolet polymerization initiator and further, optionally, the thermoplastic elastomer and the tackifier resin according to the composition formulations as shown in Table 1 below were stirred and mix-kneaded together to thereby prepare sealing materials of Examples 1 to 7 and Comparative Examples 1 to 3, and these sealing materials were measured for the melt-viscosity at 120° C.
  • the results are shown in Table 1. Incidentally, the numerical values as to the formulations in Table 1 represent weight parts.
  • Example 1 Example 2
  • Example 3 Example 4
  • Example 5 Ultraviolet-curable High-Tg acrylate A 25 40 10 5 component High-Tg acrylate B 25 40 Low-Tg acrylate C 50 50 50 55 50 Low-Tg acrylate D 25 10 25 10 25 20 Low-Tg acrylate E
  • Cationic-polymerizable compound F
  • Cationic-polymerizable compound G
  • Ultraviolet polymerization Radical polymerization initiator 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
  • Tackifier resin 5
  • Thermoplastic elastomer Melt-viscosity mPa ⁇ s/120° C.
  • Example 3 Ultraviolet-curable High-Tg acrylate A component High-Tg acrylate B Low-Tg acrylate C 70 75 50 Low-Tg acrylate D 25 25 Low-Tg acrylate E 100 Cationic-polymerizable compound F Cationic-polymerizable compound G Ultraviolet polymerization Radical polymerization initiator 3 3 3 3 initiator Cationic polymerization initiator Tackifier resin 20 Thermoplastic elastomer 10 Melt-viscosity mPa ⁇ s/120° C.
  • High-Tg acrylate A IBA-100 (produced by Soken Chemical & Engineering Co., Ltd.; Mw: 10,000, Tg before ultraviolet curing: 20° C.)
  • High-Tg acrylate B Beamset 101 (produced by Arakawa Chemical Industries, Ltd.; Mw: 430, Tg before ultraviolet curing: 18° C.)
  • Low-Tg acrylate C Shikoh-UV-3000B (produced by Nippon Synthetic Chemical Industry Co., Ltd.; Mw: 18,000, Tg after ultraviolet curing: ⁇ 52° C.)
  • Low-Tg acrylate D Shikoh-UV-3700B (produced by Nippon Synthetic Chemical Industry Co., Ltd.; Mw: 38,000, Tg after ultraviolet curing: ⁇ 59° C.)
  • Low-Tg acrylate E Shikoh-UV-2000B (produced by Nippon Synthetic Chemical Industry Co., Ltd.; Mw: 13,000, Tg after ultraviolet curing: ⁇ 40° C.)
  • the melt-viscosity as shown in Table 1 was measured under the following conditions.
  • the sealing materials of Examples 1 to 7 and Comparative Examples 1 to 3 were measured for the melt-viscosity (mPa ⁇ s) at 120° C. with a Brookfield type Themosel System viscometer, #27 spindle by a conventional method.
  • Each of the above sealing materials of Examples 1 to 7 and Comparative Examples 1 to 3 was hot-melted at a temperature of 120° C. with Foam Melt Applicator (trade name “FM-151”, produced by Nordson Corporation), and then nitrogen gas was mixed into the melting-conditioned sealing material at a gas cylinder pressure of 0.05 MPa, and then the melting-conditioned sealing material containing the pressurized nitrogen gas was discharged into the air at a discharging pressure of 5.0 MPa and thereby foamed.
  • Foam Melt Applicator trade name “FM-151”, produced by Nordson Corporation
  • Example 1 Example 2
  • Example 3 Ultraviolet-curable High-Tg acrylate A component High-Tg acrylate B Low-Tg acrylate C 70 75 50 Low-Tg acrylate D 25 25 Low-Tg acrylate E 100 Cationic-polymerizable compound F Cationic-polymerizable compound G Ultraviolet polymerization Radical polymerization initiator 3 3 3 3 initiator Cationic polymerization initiator Tackifier resin 20 Thermoplastic elastomer 10 Foam density densities 3 3 3 3 Flowing ⁇ ⁇ X X UV reactivity Stick
  • Each of the above sealing materials of Examples 1 to 7 was hot-melted at a temperature of 120° C. with Foam Melt Applicator (trade name “FM-151”, produced by Nordson Corporation), and then nitrogen gas was mixed into the melting-conditioned sealing material at a gas cylinder pressure of 0.005 MPa, and then the melting-conditioned sealing material containing the pressurized nitrogen gas was discharged into the air at a discharging pressure of 2.0 MPa and thereby foamed.
  • Foam Melt Applicator trade name “FM-151”, produced by Nordson Corporation
  • the sealing material was applied onto mold-releasing paper into the shape of a bead of about 2 cm in width and about 15 cm in length, thus preparing a test piece.
  • test piece After the test piece had cooled and solidified, its mass was measured.
  • the test piece was immersed into a measuring cylinder of 250 ml containing 200 ml of water to measure the volume of the test piece. Assuming that the specific gravity of the test piece was 1.0, the foam density was calculated by the following equation.
  • Foam density volume of test piece/mass of test piece
  • the sealing material was applied onto the surface of a stainless steel sheet “SUS-304” as defined in JIS G4305 at a foam density of 3 so as to be 5 mm in bead width and 4 mm in height, thus obtaining a sealing foam.
  • the sealing foam was left under 23° C./50 to 60 RH for 5 minutes, and thereafter the bead width was measured to make evaluation by the following marking.
  • the sealing material was applied onto the surface of a stainless steel sheet “SUS-304” at a foam density of 3 so as to be 3 mm in bead width and 4 mm in height, thus obtaining a sealing foam.
  • the aforementioned sealing foam was subjected to UV curing at an irradiation intensity of 2,000 mW/cm 2 for an irradiation time of 30 seconds. Thereafter, the cured sealing foam was left under an atmosphere of 120° C. to evaluate the surface stickiness by the following marking.
  • the ultraviolet-cured sealing foam as obtained under the same conditions as those for the above UV reactivity test was compressed to a position of 2 mm (50% compression) with a stainless steel sheet “SUS-304” and fixed with a clip. This was left in a hot-air-circulating oven of 100° C. for 5 days, and then the condition of the adhesion to the “SUS-304” was checked to make evaluation by the following marking.
  • the ultraviolet-cured sealing foam as obtained under the same conditions as those for the above UV reactivity test was compressed to a position of 2 mm (50% compression) with a stainless steel sheet “SUS-304” and fixed with a clip. While this 50% compressed condition was kept, the foam was left under a temperature of 80° C. for 24 hours. Thereafter, the compression was released under 23° C./50 to 60% RH. After the foam had been left under 23° C./50 to 60% RH for 24 hours, the thickness of the test foam of which the compression had been removed was measured.
  • the compression-set ratio was calculated by the following equation and evaluated by the following marking.
  • Compression-set ratio ( a 1 /a 0) ⁇ 100
  • the ultraviolet-cured sealing foam as obtained under the same conditions as those for the above UV reactivity test was measured for the Shore hardness 00 with “GS-754G” produced by Teclock Co., Ltd. The larger numerical value means the more hardness.
  • the ultraviolet-cured sealing foam as obtained under the same conditions as those for the above UV reactivity test was compressed to a position of 2 mm (50% compression) with a stainless steel sheet “SUS-304” and deformed into the U-shape in this condition. Water was added to a measuring line. The foam was left under 23° C./50 to 60% RH for 24 hours to check whether water bled out of the convex part of the U-shape, and it was evaluated by the following marking.
  • the ultraviolet-cured sealing foam as obtained under the same conditions as those for the above UV reactivity test was checked as to its foamed condition with a video microscope by the following marking.
  • the sealing materials of Examples 1 to 7 have excellent heat resistance, excellent compression-set, high softness (Shore hardness of about 45 to about 50), and high water tightness, and further a foamed condition where independent cells are formed.
  • Comparative Examples 2 and 3 since they do not contain any thermoplastic elastomer which is not ultraviolet-curable, they have enough heat resistance. However, they have too low melt-viscosity at 120° C. to sufficiently prevent the flowing and also have low water tightness and further fail to ensure independent cells.
  • the results as shown in Table 3 are results of evaluations under conditions deviating from the favorable conditions such as gas cylinder pressure of 0.01 to 0.1 MPa and discharging pressure of 2.7 to 9.7 MPa. Therefore, when compared with the results as shown in Table 2 satisfying the aforementioned favorable conditions, even if the sealing materials are the same, the evaluation of the foamability is a little degraded, and accompanying this, the evaluations of the heat resistance and the water tightness are also a little degraded.
  • the aforementioned gas cylinder pressure and discharging pressure are no other than favorable conditions for applying the sealing material, and when compared with the results as shown as to Comparative Examples 1 to 3 in Table 2, the superiority is high.
  • the sealing material and the method of foaming application thereof, according to the present invention can favorably used as a sealing material and method of foaming application thereof for such as household appliance parts, automobile interior and exterior parts, and automobile door modules, and for between metal sheets.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Sealing Material Composition (AREA)
  • Inorganic Chemistry (AREA)
  • Toxicology (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
US13/119,263 2008-11-14 2008-11-14 Sealing material and method of foaming application thereof Abandoned US20110210517A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/071180 WO2010055593A1 (ja) 2008-11-14 2008-11-14 シーリング材およびその発泡施工方法

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/071180 A-371-Of-International WO2010055593A1 (ja) 2008-11-14 2008-11-14 シーリング材およびその発泡施工方法

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/155,727 Division US9157005B2 (en) 2008-11-14 2014-01-15 Sealing material and method of foaming application thereof

Publications (1)

Publication Number Publication Date
US20110210517A1 true US20110210517A1 (en) 2011-09-01

Family

ID=42169742

Family Applications (2)

Application Number Title Priority Date Filing Date
US13/119,263 Abandoned US20110210517A1 (en) 2008-11-14 2008-11-14 Sealing material and method of foaming application thereof
US14/155,727 Expired - Fee Related US9157005B2 (en) 2008-11-14 2014-01-15 Sealing material and method of foaming application thereof

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14/155,727 Expired - Fee Related US9157005B2 (en) 2008-11-14 2014-01-15 Sealing material and method of foaming application thereof

Country Status (5)

Country Link
US (2) US20110210517A1 (ja)
EP (1) EP2368958B1 (ja)
JP (1) JP5314701B2 (ja)
CN (1) CN102203206B (ja)
WO (1) WO2010055593A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150021825A1 (en) * 2013-07-22 2015-01-22 Tyco Electronics Corporation Method of Injection Sealing Gel Into a Recess of a Work Piece
WO2022125544A1 (en) * 2020-12-07 2022-06-16 Certainteed Llc Photo-curable insulation foam, dispenser for injection thereof, and methods of using same in the insulation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104124178A (zh) * 2013-04-26 2014-10-29 上海和辉光电有限公司 封装材料的涂布方法及其装置
JP6725866B2 (ja) * 2015-12-21 2020-07-22 Dic株式会社 積層体の製造方法
JPWO2021112246A1 (ja) * 2019-12-04 2021-06-10

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5026806A (en) * 1988-10-31 1991-06-25 Basf Aktiengesellschaft UV-crosslinkable materials based on isoamyl (meth)acrylate copolymers
US6358580B1 (en) * 1998-01-09 2002-03-19 Thomas Mang Sealing material which swells when treated with water
JP2008056821A (ja) * 2006-08-31 2008-03-13 Nitta Gelatin Inc 紫外線硬化性樹脂組成物およびその用途

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0717896B2 (ja) 1988-01-26 1995-03-01 新田ゼラチン株式会社 建築用外壁材のラップジョイント用プレシーリング材
JPH06192468A (ja) 1992-12-25 1994-07-12 Three Bond Co Ltd 近赤外光硬化型発泡樹脂組成物とこれを用いたガスケット複合部材の製造方法
EP0612812B1 (en) 1993-02-24 2001-07-11 Ibiden Co, Ltd. Resin composites and method for producing the same
JP3142425B2 (ja) * 1993-02-24 2001-03-07 イビデン株式会社 擬似均一相溶構造を有する樹脂複合体
JP3314990B2 (ja) 1993-08-26 2002-08-19 新田ゼラチン株式会社 反応型ホットメルト組成物
CN1033648C (zh) * 1994-08-16 1996-12-25 于建立 一种密封材料及其制备方法
JPH0940870A (ja) 1995-07-28 1997-02-10 Three Bond Co Ltd 光硬化型発泡性シロキサン組成物
JPH11293020A (ja) 1998-04-06 1999-10-26 Nitta Gelatin Inc 発泡型シーリング用組成物およびその使用方法
JP2004269678A (ja) 2003-03-07 2004-09-30 Sekisui Chem Co Ltd 光反応性組成物、並びに、光後硬化性組成物、光反応性接着剤及び光反応性シーリング剤
EP1484149A1 (fr) * 2003-06-05 2004-12-08 Nmc S.A. Procédé pour la production continue de profilés pleins, creux ou ouverts
JP4884824B2 (ja) 2005-04-28 2012-02-29 新田ゼラチン株式会社 紫外線硬化性のホットメルト型シーリング材

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5026806A (en) * 1988-10-31 1991-06-25 Basf Aktiengesellschaft UV-crosslinkable materials based on isoamyl (meth)acrylate copolymers
US6358580B1 (en) * 1998-01-09 2002-03-19 Thomas Mang Sealing material which swells when treated with water
JP2008056821A (ja) * 2006-08-31 2008-03-13 Nitta Gelatin Inc 紫外線硬化性樹脂組成物およびその用途

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Translation of table 1 from JP 2008056821; 3/2008. Hayashi et al. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150021825A1 (en) * 2013-07-22 2015-01-22 Tyco Electronics Corporation Method of Injection Sealing Gel Into a Recess of a Work Piece
US9586342B2 (en) * 2013-07-22 2017-03-07 Tyco Electronics (Shanghai) Co. Ltd. Method of injection sealing gel into a recess of a work piece
WO2022125544A1 (en) * 2020-12-07 2022-06-16 Certainteed Llc Photo-curable insulation foam, dispenser for injection thereof, and methods of using same in the insulation

Also Published As

Publication number Publication date
US20140127421A1 (en) 2014-05-08
CN102203206A (zh) 2011-09-28
JPWO2010055593A1 (ja) 2012-04-05
US9157005B2 (en) 2015-10-13
EP2368958B1 (en) 2015-09-16
EP2368958A1 (en) 2011-09-28
JP5314701B2 (ja) 2013-10-16
CN102203206B (zh) 2014-01-29
WO2010055593A1 (ja) 2010-05-20
EP2368958A4 (en) 2012-10-03

Similar Documents

Publication Publication Date Title
US9157005B2 (en) Sealing material and method of foaming application thereof
TWI636115B (zh) Radiation-activated pressure-sensitive adhesive tape with dark reaction and use thereof
CN100363399C (zh) 可光固化组合物及其制造方法,可光固化压敏粘合片及其制造方法和粘合方法
CN106459708B (zh) 紫外固化型(甲基)丙烯酸酯压敏粘合剂组合物及其制备方法
US5439956A (en) Thermo-curable and ultraviolet-curable adhesive capable of high precision bonding
CA2887304A1 (en) Adhesives and related methods
BR112014018129B1 (pt) Adesivo estrutural termocurável e método para unir um membro de alumínio a um segundo membro metálico
JP2012503057A (ja) 輻射線硬化性接着剤
JP2008063406A (ja) 反応性ホットメルト接着剤組成物及びそれを用いた接着方法
CN102066517B (zh) 活化能射线固化性密封剂组合物及附有密封层的部件
JP4884824B2 (ja) 紫外線硬化性のホットメルト型シーリング材
JPS59159820A (ja) 紫外線硬化性組成物
JP2008063407A (ja) 反応性ホットメルト接着剤組成物及びそれを用いた接着方法
JPH07503266A (ja) 光活性化可能な熱硬化性エポキシ組成物
TWI725645B (zh) 用於接合聚合物之可固化熱封黏著劑
JP5442845B2 (ja) 機能性発泡体層の施工方法
US6350344B1 (en) Solventless primers which are hardenable by radiation
US6274643B1 (en) Epoxy/thermoplastic photocurable adhesive composition
CN100371748C (zh) 光波导用树脂组合物、固化性干膜、光波导及其形成方法
JPS6152169B2 (ja)
CN1080727C (zh) 单羟基化二烯烃聚合物及其环氧化衍生物
Papon 14 Adhesive Families
US6696506B1 (en) Cationic photocatalyst composition and photocurable composition
JPH10231354A (ja) エポキシ樹脂組成物、熱硬化性樹脂フィルム及び基板に対する硬化樹脂フィルムの形成方法
JP3892933B2 (ja) 活性エネルギー線硬化型樹脂組成物及びそれを使用した被膜形成方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: NITTA GELATIN INC., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SEKITA, KAZUYOSHI;NAKATANI, HIROYUKI;UENO, SEIKI;REEL/FRAME:025967/0154

Effective date: 20110223

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION