Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Reexamination Certificate
2000-08-29
2003-11-25
Mayes, Curtis (Department: 1734)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
C156S247000, C156S272200, C156S275500, C428S041500, C428S041700, C428S113000, C428S351000, C428S364000, C522S913000
Reexamination Certificate
active
06652694
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sheet-like photocurable resin compound which can be used for repair of water proof undercoatings such as those of roofs, parking lots, or floors, repair of wall materials and piping, repair and reinforcement of various structural members, and repair of boats, waterproof materials for tanks, or the like, and the present invention also relates to a method of curing the sheet-like photocurable resin compound.
2. Description of the Related Art
Photocurable resin compounds of the prior art are disclosed, for example, in Japanese Unexamined Patent Application, First Publication No. Sho 63-186744, Japanese Unexamined Patent Application, First Publication No. Hei 10-71661, Japanese Unexamined Patent Application, First Publication No. Hei 10-331345, and Japanese Unexamined Patent Application, First Publication No. Hei 10-339001. These photocurable resin compounds are used for repair or reinforcement of various piping materials and various structural members which are made of steel, concrete, and plastic, used as waterproof linings, and used for repair of automobiles and boats, waterproofing of roofs and tanks, and repair of surfboards and boats.
As a so-called lining application for civil engineering and construction, for example, waterproof coating of asphalt and lining with a vinyl chloride sheet have been carried out for applications requiring waterproofing. However, the waterproof effect is impaired within a short time because of low mechanical strength and drastic deterioration, thereby requiring frequent maintenance operations. There have been known techniques of forming waterproof layers by impregnating a glass fiber-chopped strand mat with an unsaturated polyester resin and curing it in the location of application, but this technique has the problem of adverse effects on the operating environment due to volatilization of volatile substances such as styrene monomers in the unsaturated polyester resin.
The above publications have been suggested as a means for solving the problems described above, however, with these techniques, it is impossible to secure sufficient operation time because in practice the application is often conducted outdoors where the compound is irradiated by sunlight, and even if it is possible to secure sufficient operation time, it is impossible to visually confirm whether the base material and photocurable resin compound are closely adhered to each other or bubbles have been sufficiently removed during the application because a laminate film of an aluminum foil is used as a light screening film. When applying to a wide area, it is impossible to secure enough time to attain close adhesion, thereby making it difficult to apply.
BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a sheet-like photocurable resin compound, which can provide sufficient application time, or allow control of the application time, outdoors under irradiation by natural light, and can suppress volatilization of a styrene monomer.
The present inventors have carried out intensive studies concerning sheet-like photocurable resin compounds prepared by protecting the resin compound, which contains a photopolymerization initiator having a specific absorption band and is capable of thickening, with a see-through light absorbing film having a specific absorption band, and thus completed the present invention.
That is, the present invention provides a sheet-like photocurable resin compound comprising a photocurable resin compound (i) containing as an essential component at least one unsaturated resin (A) selected from the group consisting of unsaturated polyester resin, vinyl ester resin, vinyl urethane resin, and acrylic resin, a photopolymerization initiator (B) which is not activated by irradiation with light with a wavelength of 420 nm or above, and a thickener (C) containing a thermoplastic resin powder as an active component; and a see-through light absorbing film (ii) whose transmittance to light with a wavelength of 420 nm or below is 10% or less; said photocurable resin compound being covered with said see-through absorbing film.
Preferably, the photocurable resin compound (i) contains a fiber reinforcement (E).
Preferably, the thickener (C) containing a thermoplastic resin powder as an active component is a polymer powder obtained by polymerizing an acrylic monomer.
Preferably, the thickener (C) containing a thermoplastic resin powder as an active component is a resin polymer powder having an average particle diameter within a range from 0.1 &mgr;m to 0.5mm.
Preferably, the thickener (C) containing a thermoplastic resin powder as an active component has a weight-average molecular weight of 100,000 or more.
Preferably, the transmittance to light with a wavelength of 420 nm or below is 10% or less, and said see-through light absorbing film (ii) is a thermoplastic film containing an ultraviolet absorber (D).
Preferably, the transmittance to light with a wavelength of 420 nm or below is 10% or less, and said see-through light absorbing film (ii) is a film obtained by coating a thermoplastic film with a coating composition containing an ultraviolet absorber (D).
Preferably, the transmittance to light with a wavelength of 420 nm or below is 10% or less, and said see-through light absorbing film (ii) is composed of a re-releasing adhesive containing an ultraviolet absorber (D) and a thermoplastic film.
The present invention also provides a method of curing a photocurable resin compound, which comprises shaping a photocurable resin compound while it is provided with a see-through light absorbing film (ii), removing said see-through light absorbing film (ii), and curing said photocurable resin compound by irradiating with ultraviolet light and/or natural light.
The present invention also provides a method of curing a photocurable resin compound, which comprises partially overlapping photocurable resin compounds one upon another while they are provided with a see-through light absorbing film (ii), thereby to integrate them, removing said see-through light absorbing film (ii), and curing said photocurable resin compound by irradiating with ultraviolet light and/or natural light.
The sheet-like photocurable resin compound of the present invention can provide sufficient application time even for outdoor application, and can be quickly cured by peeling off the light absorbing layer when necessary. Furthermore, the sheet-like photocurable resin compound can be applied to a large area, and can drastically reduce volatilization of styrene and provide the standing surface with a FRP layer having a uniform thickness.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will now be described in detail.
The unsaturated polyester resin as the resin (A) selected from the group consisting of unsaturated polyester resin, vinyl ester resin, vinyl urethane resin, and acrylic resin is not specifically limited, there can be used known unsaturated polyester resins which have commonly been used in unsaturated polyester resin molded articles. The unsaturated polyester resin is prepared by dissolving an unsaturated polyester, which is obtained by the condensation reaction between an &agr;,&bgr;-unsaturated carboxylic acid or an &agr;,&bgr;-unsaturated carboxylic acid containing in some cases a saturated carboxylic acid and alcohols, in a polymerizale monomer.
The &agr;,&bgr;-unsaturated carboxylic acid includes, for example, fumaric acid, maleic acid, maleic anhydride, itaconic acid, citraconic acid, mesaconic acid, chloromaleic acid, or dimethyl esters thereof. These &agr;,&bgr;-unsaturated carboxylic acids may be used alone, or two or more kinds of them may be used in combination. The unsaturated carboxylic acid includes, for example, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, HET acid, hexahydrophthalic anhydride, adipic acid, sebacic acid, or azelaic acid. These saturated carboxylic acids may be used alone, or two or more kinds of them may be used in combinatio
Motomiya Shigeru
Nonaka Shin-ichi
Tomiyama Takashi
Armstrong Westerman & Hattori, LLP
Chan Sing P
Dainippon Ink and Chemicals Inc.
Mayes Curtis
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