WO2000023285A1 - Adhesif pour page d'album photo a stabilite des couleurs - Google Patents

Adhesif pour page d'album photo a stabilite des couleurs Download PDF

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Publication number
WO2000023285A1
WO2000023285A1 PCT/US1999/024096 US9924096W WO0023285A1 WO 2000023285 A1 WO2000023285 A1 WO 2000023285A1 US 9924096 W US9924096 W US 9924096W WO 0023285 A1 WO0023285 A1 WO 0023285A1
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WO
WIPO (PCT)
Prior art keywords
adhesive
album page
mounting substrate
mounting
latex
Prior art date
Application number
PCT/US1999/024096
Other languages
English (en)
Inventor
Kiem H. Dang
Marilee M. Reski
Original Assignee
H.B. Fuller Licensing & Financing, 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 H.B. Fuller Licensing & Financing, Inc. filed Critical H.B. Fuller Licensing & Financing, Inc.
Publication of WO2000023285A1 publication Critical patent/WO2000023285A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42F—SHEETS TEMPORARILY ATTACHED TOGETHER; FILING APPLIANCES; FILE CARDS; INDEXING
    • B42F5/00—Sheets and objects temporarily attached together; Means therefor; Albums
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic

Definitions

  • This invention relates to a photographic album page adhesive which has improved color stability with time.
  • Photo album pages having a coating of a releasable pressure sensitive adhesive have been used for many years.
  • these photo album pages comprise one substrate coated with the releasable adhesive and a second substrate which is a transparent face sheet.
  • Natural latex (1,3-butadiene, 2-methyl) based adhesives have been used for coating photo album pages but discoloration or yellowing of the photo album page due to exposure to elevated temperatures or ultraviolet light is an undesirable characteristic which occurs upon use of such adhesives.
  • Synthetic based adhesives such as acrylic type latex
  • acrylic type latex have also been used for releasable coatings on photo album pages but there are several problems associated with these systems as well which include low heat resistance and lack of a smooth peeling characteristic.
  • the harder quality of these synthetic acrylic type latex adhesives causes the peel to be zippery and noisy which is undesirable to manufacturers of magnetic photo albums and to the end user as well.
  • U.S. Patent No. 5,569,503 issued October 29, 1996 to Piotroski teaches a mounting substrate for displaying items such as photos which utilizes synthetic latex based adhesive which consists of a solid phase including an aliphatic acrylic elastomer and a liquid phase including an aliphatic alkene glycol and water, for use in mounting the photos.
  • the solid phase also contains an inorganic oxide filler selected from the group consisting of aluminum oxide, calcium oxide, titanium oxide and silicon dioxide, with the preferable filler being silicon dioxide. See column 2 lines 5 to 8, lines 62 to 67 and column 3 lines 1 and 2.
  • the elastomer may be selected from the group consisting of methyl, butyl, propyl and isopropyl acrylate elastomers.
  • the liquid phase of the adhesive is comprised of an aliphatic alkene glycol and water.
  • the glycol may be selected from the group consisting of methylene, ethylene, propylene and isopropylene glycol.
  • Piotroski states at column 1 lines 8 to 14 that "previous photo album adhesives that use organic latex could not provide a uniform and solid adhesive coverage on the substrate page and that other problems inherent in latex-based adhesive photo pages are discoloration, photo damaging and loss of adhesiveness or blocking after a period of time.” Piotroski further goes on to state at lines 25 to 29 that "the development of transparent pocket sheets are evidence of the problem that is inherent in the latex-based adhesive pages, namely they lose their adhesiveness, photos fall out of the album or blocking takes place.” Hence, the adhesive of Piotroski, it is taught, overcomes the problems associated with the latex-based adhesives.
  • the synthetic latex based adhesives of the prior art have not been able to meet all of the criteria needed for a photographic album adhesive, namely heat resistance, resulting in the lack of commercial success. Additionally, the present applicants have found that various plasticizers utilized in latex based adhesives have migrated causing staining of the mounted items, such as photographs.
  • a synthetic latex may be added to a natural latex to modify the characteristics of the natural latex based adhesive.
  • These compositions exhibit improved adhesiveness and blocking resistance over 100% natural latex based compositions, high heat resistance and superior color retention over time making them ideally suited for use as photographic album page adhesives.
  • the present invention relates to a mounting substrate for releasably mounting flat items said mounting substrate comprising an adhesive coated mounting surface and a transparent cover sheet wherein said mounting surface comprises a stain- free adhesive material coated thereon said adhesive comprising from about 20 wt-% to about 98 wt-% of the adhesive of at least one latex and from about 2 wt-% to about 20 wt-% of the adhesive of at least one hiding agent.
  • the adhesive releasably secures photographs between the mounting surface and a transparent film. It has been found to be preferable to the present invention to utilize a combination of a natural latex and a synthetic latex in order to achieve superior properties.
  • the hiding agents preferably have a refractive index of greater than 2.0 and more preferably greater than about 2.5.
  • the preferable hiding agent is titanium dioxide.
  • the present invention further relates to a photograph album page for releasably mounting photographs.
  • the album page has at least one mounting surface and a transparent cover sheet wherein the mounting surface comprises a releasable adhesive material coated thereon.
  • the adhesive comprises from about 20 wt-% to about 98 wt-% of the adhesive of at least one latex and from about 2 wt-% to about 20 wt-% of the adhesive of at least one hiding agent.
  • the adhesive releasably secures photographs between the mounting surface and the transparent film.
  • the photograph album page may further have a pair of opposed mounting surfaces, each mounting surface having a transparent cover sheet wherein said mounting surfaces each comprise a releasable adhesive material coated thereon for releasably securing said photographs to said mounting surface.
  • the adhesive is of the repositionable variety having a target peel strength and exhibits no adhesive transfer. Furthermore, the adhesive has excellent adhesion to polymeric film materials and exhibits peels on such materials that are smooth and non- zippery.
  • the photograph album page is improved in that the adhesive exhibits excellent color retention over time even with elevated temperatures or ultraviolet light.
  • the adhesive of the present invention comprises at least one latex.
  • the latex can include a natural latex, a synthetic latex and mixtures thereof, preferably a natural latex. These compositions are typically supplied in water at about a 50-75% solids emulsion and may more typically be supplied as 50-65% solids emulsions. These emulsions are then useful in the present adhesive from about 20%) to about 98% by weight of the composition.
  • An example of a useful natural latex (1,3-butadiene, 2-methyl) homopolymer is Alcantex Latz®, a 62% solids emulsion available from Alcan Rubber and Chemical Co. in New York, NY.
  • the present invention may also comprise a synthetic latex.
  • synthetic latex are aqueous dispersions of water-insoluble latex polymer prepared by emulsion polymerization which is well known in the art. See D.C. Backey, Emulsion Polymerization (Wiley, 1975). Any monomer mixture which yields water-insoluble polymer latex which is dispersible in water may be used to prepare the latex polymers of the present invention.
  • vinyl acetate which itself has appreciable water solubility as a monomer, may be employed as homopolymers of vinyl acetate which are water-insoluble.
  • Useful monomers include vinyl acetate, and acrylic monomers such as the alkyl esters of acrylic acid and methacrylic acid including the (C,-C 8 )alkyl esters of acrylic acid and the (C,-C 8 )alkyl esters of methacrylic acid, such as methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, n- butyl methacrylate w-butyl acrylate, 2-ethylhexyl acrylate, w-octyl acrylate, sec-butyl acrylate, isobutyl methacrylate, and cyclopropyl methacrylate.
  • acrylic monomers such as the alkyl esters of acrylic acid and methacrylic acid including the (C,-C 8 )alkyl esters of acrylic acid and the (C,-C 8 )alkyl esters of methacrylic acid, such as methyl methacrylate, methyl
  • alpha, beta-ethylenically unsaturated monomers with appreciable water solubility such as acrylic acid, methacrylic acid, itaconic acid, citraconic acid, acrylamide and methacrylamide, may also be used in preparing the emulsion polymers useful in the present invention. It is well known in the art that the copolymerization of such water-soluble monomers with water-insoluble monomers often confers desirable properties upon the resultant copolymer including long-term latex stability, dispersibility, increased adhesion to specific substrates and so forth.
  • Acidic monomers which may be used in preparing the emulsions employed in the present invention are alpha, beta-monoethylenically unsaturated acids such as maleic, fumaric, aconitic, crotonic, citraconic, acryloxyproprionic and higher oligomers of acrylic, methacrylic and itaconic acids.
  • Further examples of acidic monoethylenically unsaturated monomers which may be copolymerized to form the water-insoluble addition polymers of the present invention include partial esters of unsaturated aliphatic dicarboxylic acids and in particular, the alkyl half esters of such acids.
  • partial esters are alkyl half esters of itaconic acid, fumaric acid and maleic acid wherein the alkyl group contains 1 to 6 carbon atoms including methyl acid itaconate, butyl acid itaconate, ethyl acid fumarate, butyl acid fumarate and methyl acid maleate.
  • polystyrene resin may be unsaturated carboxylic acids including itaconic acid, citraconic acid, crotonic acid mesaconic acid, maleic acid, fumaric acid and so forth and the , ⁇ -unsaturated dicarboxylic acid esters of the dicarboxylic acids described above including aromatic esters, cycloalkyl esters, alkyl esters, hydroxyalkyl esters, alkoxy alkyl esters and so forth.
  • the emulsion polymers may contain alpha, beta-ethylenically unsaturated aromatic monomers including styrene, vinyl toluene, 2-bromo-styrene, o-bromo-styrene, p-chloro- styrene, o-methoxy styrene, p-methoxy-styrene, allylphenol ether, allyltolyl ether and alphamethyl-styrene. It is preferable to the present invention, for some embodiments, to utilize aromatic type synthetic latex rather than aliphatic latex, either alone or in combination with a natural latex. Styrene-butadiene synthetic latex, for instance, is a preferable latex for use in the present invention.
  • the emulsion polymers may contain polar or polarizable nonionogenic hydrophilic monomer including acrylonitrile, methacrylonitrile, cis- and trans-crotonitrile, alpha- cyanostyrene, alpha-chloroacrylonitrile, ethyl vinyl ether, isopropyl vinyl ether, isobutyl vinyl ether, butyl vinyl ether, diethylene glycol vinyl ether, decyl vinyl ether, vinyl acetate, hydroxyalkyl(meth)acrylates, such as 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 3-hydroxypropyl methacrylate, butanediol acrylate, 3-chloro-2-hydroxypropyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, and vinyl thiols such as 2-mercaptopropyl methacrylate, 2-sulfoethyl methacrylate,
  • the synthetic latex polymers may also contain monomeric vinyl esters in which the acid moiety of the ester is selected from the aromatic and (C,-C 8 ) aliphatic acids including formic, acetic, propionic, w-butyric, w-valeric, palmitic, stearic, phenyl acetic, benzoic, chloroacetic, dichloroacetic, gamma-chloro butyric, 4-chlorobenzoic, 2,5-dimethyl benzoic, o-toluic, 2,4,5-trimethoxy benzoic, cyclobutane carboxylic, cyclohexane carboxylic, l-(p- methoxyphenyl)cyclohexane carboxylic, l-(p-tolyl)-l-cyclopentane carboxylic, hexanoic, myristic and p-toluic acids.
  • monomeric vinyl esters in which the acid moiety of the ester is selected from
  • the monomer mix may also include multifunctional monomers such as allyl methacrylate, divinyl benzene, diethylene glycol dimethacrylate, ethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, 1,3-butylene glycol dimethacrylate, trimethylol propane triacrylate, trimethylol propane trimethacrylate and so forth.
  • multifunctional monomers such as allyl methacrylate, divinyl benzene, diethylene glycol dimethacrylate, ethylene glycol dimethacrylate, 1,6-hexanediol diacrylate, 1,3-butylene glycol dimethacrylate, trimethylol propane triacrylate, trimethylol propane trimethacrylate and so forth.
  • Suitable vinyl monomers may include ethylene, propylene, butylene, isobutylene, hexene, vinyl acetate, vinyl esters of versatic acids, vinyl chloride (Haloflex® from ICI Chemical Co.), acrylonitrile, acrylamide, methacrylamide, vinylidene, chloride, oleic acid, linoleic acid, 1,3-butadiene, isoprene, norbornene, cyclopentadiene and the like.
  • Suitable vinyl aromatic monomers include styrene, ⁇ -methylstyrene, vinyltoluene, ethylstyrene, isopropylstyrene, p-hydroxystyrene, p-acetoxystyrene, and p-chlorostyrene.
  • Acrylic copolymers comprising alkyl esters of acrylic and methacrylic acid with minor amounts of acrylic and methacrylic acid or vinyl acrylic polymers comprising vinyl containing monomers or polymers in combination with softer acrylic monomers may be preferable to the present invention.
  • Ethylenically unsaturated monomers which are commonly used are butyl acrylate, methyl methacrylate, ethyl acrylate and mixtures thereof.
  • the polymer often comprises at least 50%) of an ester of acrylic or methacrylic acid.
  • Vinyl/acrylic types of polymers often include ethylenically unsaturated monomers such as vinyl acetate and butyl acrylate or 2-ethylhexyl acrylate where generally at least 50% of the polymer is comprised of vinyl acetate. It is preferable that these acrylic latex or aliphatic acrylic latex polymers be used in combination with a natural latex.
  • the acylic based elastomers have been found to decrease tack which may be detrimental to the ability of the adhesive to hold items on a mounting substrate.
  • ingredients may be used in the monomer composition including free radical catalysts to initiate polymerization, emulsifying agents to protect particles from agglomeration and buffers to maintain a desired pH during polymerization.
  • free radical catalysts to initiate polymerization
  • emulsifying agents to protect particles from agglomeration
  • buffers to maintain a desired pH during polymerization.
  • Conventional emulsion polymerization techniques may be used to prepare the synthetic latex polymers useful in the present invention.
  • the monomers may be emulsified with an anionic or nonionic dispersing agent at a concentration of about 0.5% to about 10% of the total monomer weight.
  • Acidic monomers being water-dispersible, serve as dispersing agents which aid in emulsifying the other monomers used.
  • a polymerization initiator or catalyst of the free radical types include ammonium or potassium persulfate and they may be used alone or in conjunction with an accelerator, such as potassium metabisulfite or sodium thiosulfate.
  • the initiator and accelerator commonly referred to as catalysts, may be used in proportions of 0.5% to 2% each based on the total weight of the monomers to be copolymerized.
  • Thermal and redox processes may be used.
  • the polymerization temperature may be from room temperature to 90°C, or more as is conventional. Batch, gradual addition, continuous and multiple stage processes may be used.
  • emulsifiers which are suited to the polymerization process of emulsions used in the present invention include alkaline metal and ammonium slats of alkyl, aryl alkyaryl and aralkyl sulfonates, sulfates and polyether sulfates; the corresponding phosphates and phosphonates; and alkyoxylated fatty acids, esters, alcohols, amines, amides; and alkylphenols.
  • Chain transfer agents including mercaptans, polymercaptans and polyhalogen compounds are often desirable in the polymerization mixture to control polymer molecular weight.
  • Copolymers which have been found to be particularly suited to the present invention include vinyl acetate acrylic, vinyl acetate ethylene and styrene-butadiene rubber. These polymers are used to enhance or depress tack levels. Vinyl acetate acrylic is preferably used in combination with a natural latex, while styrene-butadiene rubber may be used alone or in combination with a natural latex. This also depends on the level of tack required. With lower tack levels, it is more difficult to mount items without worry that they will later release from the adhesive coated mounting surface. The amount of tack desired will depend on the end user. This may also vary with coating thickness and application.
  • these synthetic latexes are suitable from 0% to about 50% by weight of the adhesive composition, preferably from about 1 wt-% to about 50 wt-% and most preferably from about 5% to about 30% by weight of the adhesive composition.
  • These latex products are typically supplied as emulsions at about 40%> - 70%> solids.
  • suitable synthetic latex include WB-0531, an acrylic emulsion, sold by the H.B. Fuller Co. in St. Paul, MN; WB-3250, an acrylic emulsion available from the H.B. Fuller Co. in St. Paul, MN; PD-2044, a vinyl acrylic copolymer available from the H.B.
  • Airflex® 440H an ethylene vinyl acetate emulsion available from Air Products and Chemicals in Allentown, PA
  • Butofan NS 144 a styrene/butadiene emulsion available from BASF Corp., Dispersions and Paper Chemicals in Charlotte, NC.
  • the most useful hiding agent to the present invention has a refractive index of preferably greater than about 2.0, more preferably greater than about 2.25, even more preferably greater than about 2.5 and most preferably greater than about 2.7.
  • the hiding agent utilized is titanium dioxide.
  • titanium based hiding agents are useful from about 2% to about 20% of the composition, preferably from about 3% to about 15%> by weight of the composition and most preferably from about 3% to about 10% by weight of the composition.
  • levels of titanium dioxide between about 8 wt-% and 9 wt-% are a maximum in that no further benefit may be seen from higher levels.
  • the paper used also has white pigment and will produce values for yellowness index. Once the color of the adhesive composition equals that of the paper, there is no need to further increase the level of titanium dioxide. These values are based on the solid weight of the hiding agent and not the emulsion.
  • a suitable hiding agent is Tiona® RCL-535 (refractive index 2.71) titanium dioxide available from Millennium Inorganic Chemicals in Hunt Valley, MD. Many available grades of titanium dioxide are available from Millennium under the tradename of Tiona® .
  • Ropaque® OP-62
  • the resultant adhesive blend when using this particular hiding agent alone was found to have a less white appearance when the adhesive is in film form and it also did not conceal the yellowing when the adhesive was exposed to UN light. It is surmised that this particular product is less useful because the refractive index is less than 2.0.
  • fillers may be used in combination with the preferred hiding agents. These fillers are less useful when used alone. The present inventors have found them to be insufficient to conceal the yellowing of the adhesive.
  • These fillers may be inorganic oxides and sulfides including those of aluminum, ammonium, barium, calcium, magnesium, silicon, zinc and mixtures thereof. Specific examples include calcium carbonate, barium sulfate, barium sulfate-zinc sulfide, aluminum oxide, calcium silicate and silicon dioxide. Silicon dioxide has a refractive index from about 1.41 to about 1.49. Talcs, clays, silicas, starch and synthetic microspheres may also be useful to the present invention.
  • Zinc oxide is often used as an antioxidant but in the present invention it was found to increase discoloration or yellowing.
  • Calcium carbonate (limestone) is available from ECC International in Atlanta, GA and has a refractive index of about 1.63.
  • Silicon dioxide has a refractive index from about 1.41 to about 1.49.
  • Various additives may also be utilized in the present invention including stabilizers, preservatives, defoamers, thickeners, ultra-violet light absorbers, antisettling agents, surfactants and mixtures thereof.
  • Useful defoamers include Foamaster® VF, an oil based defoamer available from Henkel Corporation and Antifoam® FG-10, a silicone defoamer available from Dow Corning.
  • Useful thickeners include Alcogum® 296-W, a 2-propenoic acid homopolymer sodium salt available from Alco Chemical Co. and ⁇ opco® DSX-1515, a urethane ethyoxylate available from Henkel Corp.
  • Some plasticizers may be detrimental to the present invention in that they may cause staining and discoloration of both the album page and the photographic paper or staining of other items which may be mounted in scrap books or memory albums.
  • Texanol® an ester alcohol solvent available from Eastman Chemical Co. in Kingsport, TN, was found to cause discoloration of the photographic paper even in very small amounts of less than 5 wt-%.
  • Aliphatic alkene glycols may undesirably soften the adhesive, lowering heat resistance and may increase the possibility that the photographs or other mounted items are stained due to plasticizer migration. It has been found, therefore, that it is preferable to use an aliphatic alkene glycol-free adhesive as well as an ester alcohol-free adhesive. Plasticizers which have a tendency to migrate less, for instance, those with higher molecular weights than those previously mentioned, may be useful to the present invention. It is preferable to the present invention to utilize plasticizers in small amounts to insure good heat resistance and stain-free substrates.
  • the adhesives of the present invention have excellent color retention as measured by yellowness index using a Minolta Chromameter.
  • the adhesive composition will have a yellowness index of less than about 22 and preferably less than about 20 at 70 hours or more and even more preferably will have a yellowness index of less than about 22 and more preferably less than about 20 at 140 hours or more and most preferably will have this yellowness index at greater than about 160 hours when exposed to ultraviolet radiation.
  • the resultant water based emulsion preferably has a viscosity of about 500 cPs to about 5000 cPs and more preferably from about 1000 to about 3000 cPs.
  • emulsions are useful as adhesives or coatings for releasably mounting articles on display surfaces. These surfaces have also been referred to in the industry as adhesive coated mounting substrates.
  • a clear film material is laminated over the top of these mounting substrates for displaying flat items including photographs, newspaper articles, occasion cards, postcards and so forth.
  • These clear films are generally plastic or polymeric in nature and may be, for instance, polyethylene, polyester(e.g. Mylar®) or polypropylene (i.e. biaxially oriented polypropylene film). Often, these mounting surfaces are found in photograph albums or other books used for keeping memorabilia.
  • the adhesive is generally coated on a single-sided, or more commonly, a dual-sided substrate where both sides of the substrate are coated with adhesive and the transparent film is laminated to both sides.
  • the adhesive may be coated on the whole substrate or page, or may be coated on the edges of a page. The latter may be more common for mounting one item versus coating the whole page which also operates to secure each item to the mounting substrate or page of the photo album.
  • the compositions of the present invention have been found to be especially advantageous for these mounting substrates because of the lack of yellowing or discoloration which has occurred with aging. These mounting pages are generally white in nature and it is aesthetically unappealing when the adhesive composition yellows. This often is especially noticeable around the edge of the photograph.
  • compositions of the present invention have further been found to be especially suited for use in mounting photographs in that there is no staining of the photographic paper. This may occur from the use of solvents, for instance.
  • the resultant compositions are therefore, stain-free.
  • none of the adhesive ingredients migrate which may cause staining of the items placed on the mounting substrate or of the mounting substrate itself.
  • Plasticizer migration is one such cause of staining. This is most notably seen on the mounting substrate around the edges of mounted items such as photographs and on the items themselves. Staining of photographic paper is a common phenomenon with the use of certain plasticizers.
  • These compositions may be applied using any standard coating equipment, lamination equipment or variations thereof.
  • compositions of the present invention have a smooth, soft peel which lacks any zippery or noisy quality. If a peel is not smooth, it will be found that the adhesive will release a substrate, such as a transparent cover sheet for a photograph album, in a zippery fashion. This will make an undesirable sound as the transparent page is pulled away from the adhesive coated mounting surface.
  • the peel value should also not increase with time making it harder, or impossible to remove the items from the mounting substrate. It is also undesirable that the adhesive decrease greatly in peel value, especially to the point where the items would release from the mounting substrate. Preferably, the peel will remain more similar to the initial peel upon aging.
  • Initial peel values as measured using a 180° peel value method are preferably from about 5 grams per linear inch (about 2 g/linear cm) to about 200 g/linear inch (about 80 g/linear cm).
  • Re-Seal peel values as measured according to the peel test method found in the following Test Methods section is preferably from about 2 g/linear cm to about 80 g/linear cm.
  • This peel value is preferably no less than about 40% of the original peel value, more preferably no less than 50% of the original peel value, even more preferably no less than about 55%, even more preferably no less than about 65% of the original peel value and most preferably no less than about 70% of the original peel value.
  • the range is preferably from about 3 g/linear cm to about 60 g/linear inch and more preferably from about 2 to about 80 g/linear cm.
  • Drawdowns were made at a 5 mil (.13 cm) thickness using a drawn down square on a "multipurpose" white paper (approximately 178 grams per meter squared). The samples were allowed to dry overnight at room temperature. They were then placed in a ultraviolet chamber at about 60°C.
  • Y.I 70*a + 175*b / 0.98041*L where (a, b, L) are determined by the Chromameter.
  • a wire-wound no. 18 drawdown is used to make a coating of adhesive on 192 g/m 2 multipurpose white paper (8.5" x 11").
  • the coating is allowed an open time of 20 seconds at which time a 2" x 3" (5.1 cm x 7.6 cm) piece of Kodak® photograph paper is placed in the center of the coated sheet of paper.
  • Polypropylene film is then laminated over the top of the photograph paper and to the coated white paper with a 15 lb (6.8 kg) roller.
  • the finished laminate is conditioned overnight at room temperature and then placed in an ultraviolet chamber for 1 week.
  • the samples are then visually inspected for staining and discoloration along the edges of the photograph paper.
  • the samples are also checked for removability from the substrate.
  • Table I shows the effects of adding increasingly higher amounts of titanium dioxide to natural latex.
  • the samples were tested as found in Test Method No. 1 and were tested after 72 hours in a UV chamber at a temperature of 60°C. An acceptable color is not achieved until approximately 2.5 wt-%> of titanium dioxide is added to the natural latex. An optimum color is reached at about 3.5 wt-% of titanium dioxide according to the present invention. Comparative Examples C-L Table II
  • Comparative example M and examples 15, 17, 19 and 20 have 0.60 grams of ammonium hydroxide.
  • Examples 17 and 19 have 0.8 grams of ammonium hydroxide.
  • Each example also has about 0.5 wt-% defoamer and 1.0 wt-% thickener.
  • Comparative Examples N-P and examples 21-23 illustrate compositions having a synthetic latex as well as a natural latex. Three different synthetic latexes have been utilized. The comparative examples have no titanium dioxide while examples 21-23 have approximately 7.5% titanium dioxide. As can be seen in Table VI, the compositions without titanium dioxide have unacceptable "yellowness" indices between 48 and 72 hours while those containing the titanium dioxide are still acceptable even at 168 hours.
  • Table VII illustrates peel values which are acceptable to the present invention. Titanium dioxide did not adversely affect the re-seal peel.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

La présente invention concerne une page d'album de photographie permettant le montage de photographies de façon décollable. La page d'album présente au moins une surface de montage ainsi qu'une feuille de couverture transparente, ladite surface de montage étant recouverte d'une matière adhésive sans tache. L'adhésif contient environ 20 % en poids à environ 98 % en poids d'au moins un latex et environ 2 % en poids à environ 20 % en poids d'au moins un agent masquant. L'adhésif fixe des photos de façon amovible entre la surface de montage et le film transparent.
PCT/US1999/024096 1998-10-22 1999-10-18 Adhesif pour page d'album photo a stabilite des couleurs WO2000023285A1 (fr)

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US09/177,255 1998-10-22

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030050359A (ko) * 2001-12-18 2003-06-25 박명원 발열중합반응을 이용한 유색아크릴수지를 함유한 코팅용점착제의 제조방법 및 그 방법에 의해 제조된 점착제
KR100447073B1 (ko) * 2001-11-29 2004-09-04 서석홍 유색점착제 제조방법
KR100538776B1 (ko) * 2002-05-29 2005-12-23 서석홍 점착제 제조방법
US20150353783A1 (en) * 2014-06-05 2015-12-10 Bostik Sa Peelable adhesive composition

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JPH0493377A (ja) * 1990-08-09 1992-03-26 Shinroihi Kk 蛍光粘着シートおよびその製造方法
US5490739A (en) * 1995-05-05 1996-02-13 Olson; Kristin Window display photo album
CN1134965A (zh) * 1996-03-22 1996-11-06 厦门大学 具涂饰覆盖耐黄变高粘接强度接枝氯丁胶粘剂及其生产工艺

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Publication number Priority date Publication date Assignee Title
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100447073B1 (ko) * 2001-11-29 2004-09-04 서석홍 유색점착제 제조방법
KR20030050359A (ko) * 2001-12-18 2003-06-25 박명원 발열중합반응을 이용한 유색아크릴수지를 함유한 코팅용점착제의 제조방법 및 그 방법에 의해 제조된 점착제
KR100538776B1 (ko) * 2002-05-29 2005-12-23 서석홍 점착제 제조방법
US20150353783A1 (en) * 2014-06-05 2015-12-10 Bostik Sa Peelable adhesive composition
US10745594B2 (en) * 2014-06-05 2020-08-18 Bostik Sa Peelable adhesive composition

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