WO2000050957A1 - Multilayer article with adhesion-promoting layer and method of making - Google Patents
Multilayer article with adhesion-promoting layer and method of making Download PDFInfo
- Publication number
- WO2000050957A1 WO2000050957A1 PCT/US2000/004693 US0004693W WO0050957A1 WO 2000050957 A1 WO2000050957 A1 WO 2000050957A1 US 0004693 W US0004693 W US 0004693W WO 0050957 A1 WO0050957 A1 WO 0050957A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- polymer
- adhesion
- imaging
- silver
- Prior art date
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- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 description 1
- 125000006413 ring segment Chemical group 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- IZXSLAZMYLIILP-ODZAUARKSA-M silver (Z)-4-hydroxy-4-oxobut-2-enoate Chemical compound [Ag+].OC(=O)\C=C/C([O-])=O IZXSLAZMYLIILP-ODZAUARKSA-M 0.000 description 1
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- AQRYNYUOKMNDDV-UHFFFAOYSA-M silver behenate Chemical compound [Ag+].CCCCCCCCCCCCCCCCCCCCCC([O-])=O AQRYNYUOKMNDDV-UHFFFAOYSA-M 0.000 description 1
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- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
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- OXOZKDHFGLELEO-UHFFFAOYSA-M silver;3-carboxy-5-hydroxyphenolate Chemical compound [Ag+].OC1=CC(O)=CC(C([O-])=O)=C1 OXOZKDHFGLELEO-UHFFFAOYSA-M 0.000 description 1
- CLDWGXZGFUNWKB-UHFFFAOYSA-M silver;benzoate Chemical compound [Ag+].[O-]C(=O)C1=CC=CC=C1 CLDWGXZGFUNWKB-UHFFFAOYSA-M 0.000 description 1
- JKOCEVIXVMBKJA-UHFFFAOYSA-M silver;butanoate Chemical compound [Ag+].CCCC([O-])=O JKOCEVIXVMBKJA-UHFFFAOYSA-M 0.000 description 1
- OIZSSBDNMBMYFL-UHFFFAOYSA-M silver;decanoate Chemical compound [Ag+].CCCCCCCCCC([O-])=O OIZSSBDNMBMYFL-UHFFFAOYSA-M 0.000 description 1
- MNMYRUHURLPFQW-UHFFFAOYSA-M silver;dodecanoate Chemical compound [Ag+].CCCCCCCCCCCC([O-])=O MNMYRUHURLPFQW-UHFFFAOYSA-M 0.000 description 1
- GXBIBRDOPVAJRX-UHFFFAOYSA-M silver;furan-2-carboxylate Chemical compound [Ag+].[O-]C(=O)C1=CC=CO1 GXBIBRDOPVAJRX-UHFFFAOYSA-M 0.000 description 1
- LTYHQUJGIQUHMS-UHFFFAOYSA-M silver;hexadecanoate Chemical compound [Ag+].CCCCCCCCCCCCCCCC([O-])=O LTYHQUJGIQUHMS-UHFFFAOYSA-M 0.000 description 1
- ORYURPRSXLUCSS-UHFFFAOYSA-M silver;octadecanoate Chemical compound [Ag+].CCCCCCCCCCCCCCCCCC([O-])=O ORYURPRSXLUCSS-UHFFFAOYSA-M 0.000 description 1
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- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000011877 solvent mixture Substances 0.000 description 1
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- 229960002317 succinimide Drugs 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- PXQLVRUNWNTZOS-UHFFFAOYSA-N sulfanyl Chemical class [SH] PXQLVRUNWNTZOS-UHFFFAOYSA-N 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- AUHHYELHRWCWEZ-UHFFFAOYSA-N tetrachlorophthalic anhydride Chemical compound ClC1=C(Cl)C(Cl)=C2C(=O)OC(=O)C2=C1Cl AUHHYELHRWCWEZ-UHFFFAOYSA-N 0.000 description 1
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- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
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- 239000004408 titanium dioxide Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
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- OTOHACXAQUCHJO-UHFFFAOYSA-H tripotassium;hexachlororhodium(3-) Chemical compound [Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[Cl-].[K+].[K+].[K+].[Rh+3] OTOHACXAQUCHJO-UHFFFAOYSA-H 0.000 description 1
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Classifications
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- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
- B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- G03C1/494—Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
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- G03C2001/7492—Slide hopper for head or curtain coating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/165—Thermal imaging composition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
- Y10T428/3179—Next to cellulosic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
- Y10T428/31797—Next to addition polymer from unsaturated monomers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31971—Of carbohydrate
Definitions
- This invention relates to multilayer articles, such as radiation-sensitive imaging articles, having two or more layers on a polymeric support.
- a layer next to the support has a single-phase mixture of polymers that provides multiple properties including adhesion of the layer to the polymeric support.
- the invention is directed to photothermographic elements.
- the invention also relates to a method of preparing the noted articles, including photothermographic elements.
- Photographic materials are photosensitive silver halide materials that are processed to provide a visible image using conventional liquid processing solutions.
- Photothermographic imaging materials and other heat-processable materials are also well known. These materials are also known in the art as "dry silver” materials and generally comprise a support having coated thereon a photosensitive emulsion comprising a photosensitive silver material, a non-photosensitive, reducible silver source, a reducing agent for silver ions, and a binder.
- the photosensitive silver material is generally photographic silver halide that must be in catalytic proximity to the non-photosensitive, reducible silver source. Catalytic proximity requires an intimate physical association of these two materials so that when silver atoms are generated by irradiation or light exposure, those atoms are able to catalyze the reduction of the reducible silver source.
- Reducible silver sources are generally silver salts of a long chain aliphatic carboxylic acids (such as a behenic or other fatty acid salts).
- exposure of the photographic silver halide to light produces small clusters of silver atoms that form a latent image in an imagewise fashion. Since the latent image is not visible by ordinary means, it must be further processed to produce a visible image.
- the binders used in photothermographic elements must be stable for thermal processing and provide both layer cohesion and interlayer adhesion.
- all coatings usually require a specific range of adhesion with underlying coatings or supports (such as polyester substrates) to meet useful end purposes.
- the conventional state of the art is to treat the support surface in some manner, such as with electrical corona treatment, flame treatment and glow discharge, to increase wettability and bonding strength. While these treatments do provide increased adhesion, they also leave charge or surface irregularities on the support that result in surface irregularities when an organic solvent based coating is applied.
- Other disadvantages with such treatments are high inherent capital costs, maintenance and upkeep of the equipment and in some cases the need for inert gases.
- Another manner for improving adhesion is to apply a primer layer on the support prior to applying other layers including photosensitive layers.
- Such coatings include a wide range of formulations, and are usually aqueous in nature to provide the desired adhesion to subsequent layers. These methods are generally inadequate when organic solvent-based coatings are applied to the primer layer due to poor adhesion and/or migration of the components from the primer layer into upper layers. These result in a variety of unwanted physical (for example, product discoloration, haze, static discharge, gels, and poor coating quality) or chemical (for example, dye fade and sensitometric effects) effects.
- the photosensitive layer also includes a polymeric component that is not a polyvinyl acetal. This polymeric component has a higher strength of adhesion to polyester film than a polyvinyl acetal and the improved adhesion is readily observed in high-density image areas.
- Primer layers for photothermographic materials are described for example in US-A-4,752,559 (Helland et al) to include a pigmented acrylic polymer binder system. This binder system is said to adhere to a photosensitive layer containing a variety of polymer binders including polyvinyl acetals. Polymeric substrates can also be coated with a polyacrylate/gelatin composition that either adheres the photosensitive layer to the substrate or includes the photosensitive materials, as described in US-A-5,244,780 (Strobel et al).
- Block and graft copolymers are described as adhesion promoting materials in US-A-5,384,192 (Long et al) between the support and the organic polymer layer (photosensitive layer).
- the copolymers have a component compatible with the organic polymer layer and a poly(vinyl phenol).
- Other more complicated polymer subbing layer materials are described in US-A-5,639,589 (Bauer et al).
- primer layers may be necessary in some instances, but as noted above, their use presents a number of problems. In addition, they require additional coating passes, capital investment and film waste. Curl may also result from application of the additional layer.
- Thin "accelerating” or carrier layers are described in US-A-4,569,863 (Koepke et al) for use in what is known as “curtain” coating methods for preparing multilayer photographic elements. Still other coating techniques are described in US- A-4,572,849 (Koepke et al) in which thin accelerating layers are composed of various hydrophilic coating materials.
- this invention provides an article comprising a polymeric support and having disposed thereon: a) a first layer comprising at least one film-forming polymer, and b) a second layer inte ⁇ osed between and adhering the first layer and the polymeric support and containing no silver, the second layer being coated out of a predominantly organic solvent medium, and comprising a mixture of two or more polymers that include a first polymer serving to promote adhesion of the second layer to the polymeric support, and a second polymer that is compatible with or of the same class as the film-forming polymer in the first layer.
- this invention also provides a photothermographic element comprising a polymeric support and having a photothermographic imaging layer containing at least one film-forming polymer disposed on one side of the polymeric support, and optionally having a non-imaging layer containing at least one film- forming polymer on the opposite side of the polymeric support, and having inte ⁇ osed between and adhering the polymeric support and either the photothermographic imaging layer or the non-imaging layer, a non-imaging adhesion- promoting layer coated out of a predominantly organic solvent medium, the non- imaging adhesion-promoting layer comprising a mixture of two or more polymers that include a first polymer serving to promote adhesion of the non- imaging adhesion- promoting layer to the polymeric support, and a second polymer that is compatible with or of the same class as the film-forming polymer in either the photothermographic imaging layer or the non-imaging layer.
- a method of this invention is a method of promoting adhesion of a first layer to
- a method of reducing delamination in a multilayer article during slitting, cutting or chopping said multilayer article comprises: A) applying to a polymeric support, a second layer out of a second fluid predominantly comprising a second organic solvent, the second layer containing no silver, and
- the article described above can be prepared using a method comprising:
- the present invention provides advantages with the use of a thin wet
- adhesion-promoting layer can provide the desired adhesion between polymeric supports, particularly polyester supports, and upper layers that are formulated and coated out of organic solvents.
- the use of primer layers and various adhesion-promoting treatments of the support are avoided.
- the adhesion-promoting layer is as thin as possible so the effects on sensitometric or functional properties are minimized. In fact, some sensitometric problems such as haze and "starry night" are minimized with the present invention.
- adheresion-promoting polymers ("first” polymer) and one or more "second” polymers that are compatible with or of the same class as the film-forming polymers in the polymer-containing (for example, imaging) layer immediately above.
- the mixture of two or more polymers can be heterogeneous (multi-phase) or homogeneous (single-phase) in nature, it is preferred that this mixture be homogeneous or single-phase in nature, both during the coating operations and upon drying as a layer in the imaging element.
- compatible with is meant that the "second" polymer in the adhesion-promoting layer ("second” layer) and at least one film-forming polymer in the upper layer (“first” layer) form a single phase when mixed and during the time it takes for the two layers to dry after coating.
- the “carrier layer” dries into a distinct layer with little intermixing with the film-forming polymer layer coated above it except at the interface.
- the adhesion-promoting layer is generally greater than the tensile forces applied during any chopping or slitting of the coated article.
- sensitometric properties such as photographic speed
- various physical properties of the imaging materials are not adversely affected by the use of the adhesion-promoting layer described herein, and some are improved, as noted in the Examples below.
- Non-imaging articles prepared by this invention can be differential release products, painted articles, data storage devices (such as a magnetic computer tape or floppy or rigid disks or diskettes), lapping film or anti-reflective film having the desired structure and function that would be readily apparent to one skilled in the art from the teaching provided herein.
- the invention can be used to manufacture imaging materials including, but not limited to, photographic silver halide materials, thermographic or photothermographic elements, image-receiving elements and commercial signage films.
- photographic silver halide materials are sensitive to imaging radiation but require conventional wet processing to convert the latent images to visible black-and-white or color images.
- Thermographic elements are materials that are imaged and developed using thermal energy. While most of the following description and examples are directed to the preferred articles, that is photothermographic elements, this application is not to be construed to be so limited in scope. It is well known in the art that photographic materials are different in construction and use than thermographic and photothermographic materials (see for example US-A-5,928,857, noted above, Cols. 1-3).
- the articles of this invention comprise a polymeric support that is generally a flexible film that has any desired thickness and is composed of one or more polymeric materials depending upon the use of the articles.
- the supports are generally transparent or at least translucent, but in some instances, opaque supports may be useful.
- Useful polymeric materials for making such supports include, but are not limited to, polymers (such as polyethylene terephthalate and polyethylene naphthalate), cellulose acetate and other cellulose esters, polyvinyl acetal, polyolefins (such as polyethylene and polypropylene), polycarbonate, and polystyrenes.
- Preferred supports are composed of polymers having good heat stability, such as polyesters and polycarbonate. Polyethylene terephthalate film is the most preferred support.
- Such supports are preferably uncoated and untreated prior to coating the adhesion-promoting and other layers thereon.
- the adhesion-promoting layer in the articles of this invention is coated out one or more miscible organic solvents including, but not limited to, methyl ethyl ketone (2-butanone), acetone, toluene, tetrahydrofuran, ethyl acetate, ethanol, methanol, or any mixture of any two or more of these solvents. Methyl ethyl ketone is preferred for this pu ⁇ ose.
- This adhesion-promoting layer also includes one or more adhesion- promoting polymers that are generally soluble or dispersible in the organic solvents noted above.
- adhesion-promoting polymers can be chosen from one or more of the following classes: polyvinyl acetals (such as polyvinyl butyral and polyvinyl formal), cellulosic polymers (such as cellulose acetate, hydroxymethyl cellulose and cellulose acetate butyrate), polyvinyl chloride, polyvinyl acetate, epoxies, polyesters, polystyrene, polyacrylonitrile, polycarbonates, methacrylate polymers, maleic anhydride ester copolymers, rosin polymers, polyketone resins, and butadiene-styrene copolymers.
- polyvinyl acetals such as polyvinyl butyral and polyvinyl formal
- cellulosic polymers such as cellulose acetate, hydroxymethyl cellulose and cellulose acetate butyrate
- polyvinyl chloride such as polyvinyl acetate, epoxies
- polyesters polystyrene
- polyvinyl acetals polyester resins, cellulosic polymers and vinyl polymers such as polyvinyl acetate and polyvinyl chloride are particularly preferred, and the polyvinyl acetals, polyesters and vinyl polymers are more preferred. Polyester resins are most preferred.
- the adhesion-promoting polymers are generally hydrophobic in nature.
- the adhesion-promoting polymers are also identified as "first" polymers in the single-phase mixture of polymers. As used herein for all polymeric materials, the term “polymer” is defined to include homopolymers, copolymers and te ⁇ olymers.
- the adhesion-promoting layer also includes one or more "second" polymers that are compatible with or of the same class as at least one film- forming polymers in the "first” layer defined herein. Many of the film-forming polymers useful in the "first” layer are described below (for example, binders used in imaging layers and other layers that can be disposed above the adhesion-promoting layer).
- polymers are “compatible with” or “of the same class” as those film-forming polymers.
- Particularly useful "second” polymers include, but are not limited to, polyvinyl acetals, cellulosic polymers, vinyl polymers, methacrylate polymers and maleic anhydride-ester copolymers.
- the most preferred “second” polymer is poly(vinyl butyral).
- mixtures of these second polymers can be used in the adhesion-promoting layer.
- These second polymers are also soluble or dispersible in the organic solvents described above.
- a preferred mixture of polymers in the adhesion-promoting layer is a single phase mixture of a polyester resin and poly( vinyl butyral).
- the weight ratio of "first" polymer to "second" polymer (or weight ratio of "third” polymer to the "fourth” polymer as described below) in the adhesion-promoting layer is generally at least 2:98, and preferably at least 4:96. The upper limit of this ratio if generally 95:5 and preferably 90:10.
- the adhesion-promoting layer can also include still other polymers that are not defined herein as first or second polymers. These additional polymers can be either hydrophobic or hydrophilic.
- hydrophilic polymers that may be present include, but are not limited to, proteins or polypeptides such as gelatin and gelatin derivatives, polysaccharides, gum arabic, dextrans, polyacrylamides (including polymethacrylamides), polyvinyl pyrrolidones and others that would be readily apparent to one skilled in the art.
- the adhesion-promoting layer includes materials that may improve coatability or adhesion, antihalation dyes, crosslinking agents (such as diisocyanates), surfactants and shelf-aging promotors.
- the polymers in the adhesion-promoting layer generally comprise at least 0.1 weight % (preferably at least 0.2 weight %) of the total wet coating weight of the layer.
- the maximum amount of such polymers is generally 40 weight %, and preferably up to 20 weight %, based on total wet coating weight.
- the adhesion-promoting layer is pu ⁇ osely relatively thin when dried in order to provide the desired benefits (that is, sensitometric and physical properties).
- its dry thickness is less than 20 ⁇ m, preferably less than 5 ⁇ m and more preferably less than 1 ⁇ m.
- the minimum dry thickness is generally at least 0.05 and preferably at least 0.15 ⁇ m.
- the adhesion-promoting layer is used to adhere the "polymer- containing layer" to the polymeric support.
- This polymer-containing layer can be any functional layer such as the imaging layer, an interlayer, an antihalation layer (containing one or more antihalation dyes), an antistatic layer or a layer containing a matting agent.
- these layers can have multiple functions, such as a layer that is both an antihalation layer and contains matting agent, or a layer that is both an antistatic layer and contains matting agent, or any other combination readily apparent to one skilled in the art.
- the polymer-containing layer is an imaging layer (such as a photothermographic imaging layer) or an antihalation or antistatic layer that may be either side of the support (most preferably, opposite the imaging layer).
- the film-forming polymers generally used in such layers are well known in the art and include such classes of polymers as cellulosic polymers, polyvinyl acetals, vinyl polymers and acrylic polymers.
- the one or more film-forming polymers are generally present in the upper layers in an amount of at least 1% based on dry layer weight.
- an article comprises a polymeric support and has disposed on one side of the polymeric support: a) a first layer comprising at least one film-forming polymer, and b) a second layer inte ⁇ osed between and adhering the first layer and the polymeric support and containing no silver, the second layer being coated out of a predominantly organic solvent medium, and comprising two or more polymers that form a single phase mixture, the two or more polymers including a first polymer serving to promote adhesion of the second layer to the polymeric support, and a second polymer that is compatible with or of the same class as the film-forming polymer in the first layer, and disposed on the opposing side of the polymeric support: a) a third layer comprising at least one film-forming polymer, and b) a fourth layer inte ⁇ osed between and adhering the third layer and the polymeric support and containing no silver, the fourth layer being coated out of a predominantly organic solvent medium, and comprising two or more polymers that form a single phase mixture
- the first layer is a silver-containing imaging layer, such as a photothermographic imaging layer.
- the third layer can be an antihalation layer, an antistatic layer, or a layer containing a matting agent.
- the second and fourth layers are directly disposed on said polymeric support.
- the polymer-containing layer is the photosensitive imaging layer of a photothermographic element and the film-forming polymers are typically binders in that layer.
- imaging elements will be directed to the preferred photothermographic elements, but the invention is not to be construed as limited to these types of elements only.
- a photothermographic element of this invention comprises a polyester film support and has on one side thereof, a photothermographic imaging layer comprising a silver salt of a fatty acid, a silver reducing agent, and at least one binder polymer that is a polyvinyl acetal, and inte ⁇ osed between and adhering the polyester film support to the photothermographic emulsion layer, a non-imaging adhesion-promoting layer that is coated out of a predominantly organic solvent medium, the non-imaging adhesion- promoting layer comprising a single phase mixture of a polyvinyl acetal and a polyester resin, the element further comprising on the opposite side of the polyester film support, an antistatic layer comprising an antistatic agent, a matting agent and a cellulosic polymer binder, and inte ⁇ osed between and adhering said polyester film support to the antistatic layer, a non-imaging antihalation dye-containing adhesion-promoting layer that is coated out of a predominantly organic solvent medium, the non-imaging
- a photothermographic element of the present invention includes one or more photosensitive silver halides in the photothermographic imaging layer.
- the photosensitive silver halide can be any photosensitive silver halide, such as silver bromide, silver iodide, silver chloride, silver bromoiodide, silver chlorobromo- iodide, silver chlorobromide and others readily apparent to one skilled in the art.
- the silver halide may be in any form that is photosensitive including, but not limited to, cubic, octahedral, rhombic dodecahedral, orthorhombic, tetrahedral, other polyhedral, or tabular mo ⁇ hologies and may have epitaxial growth of crystals thereon.
- the silver halide grains may have a uniform ratio of halide throughout.
- They may have a graded halide content, with a continuously varying ratio of, for example, silver bromide and silver iodide or they may be of the core-shell-type, having a discrete core of one halide ratio, and a discrete shell of another halide ratio.
- Core-shell silver halide grains useful in photothermographic elements and methods of preparing these materials are described in US-A-5, 382,504 (Shor et al).
- a core-shell silver halide grain having an iridium-doped core is particularly preferred.
- Iridium doped core-shell grains of this type are described in US-A-5,434,043 (Zou et al).
- the photosensitive silver halide can be added to the imaging layer in any fashion so long as it is placed in catalytic proximity to the light-insensitive reducible silver compound that serves as a source of reducible silver.
- the silver halide be preformed and prepared by an ex-situ process.
- the silver halide grains prepared ex-situ may then be added to and physically mixed with the reducible silver source. It is more preferable to form the non-photosensitive reducible silver source in the presence of ex-situ prepared silver halide. In this process, silver soap is formed in the presence of the preformed silver halide grains. Co-precipitation of the silver halide and reducible source of silver provides a more intimate mixture of the two materials (see, for example US-A-
- Preformed silver halide emulsions used in the material of this invention can be unwashed or washed to remove soluble salts.
- the soluble salts can be removed by chill setting and leaching or the emulsion can be coagulation washed (for example by the procedures described in US-A-2, 618,556, US-A- 2,614,928, US-A-2,565,418, US- A-3, 241,969 and US-A-2,489,341).
- the light-sensitive silver halide used in the photothermographic elements of the present invention is preferably present in an amount of from about 0.005 to about 0.5 mole, more preferably from about 0.01 to about 0.15 mole per mole, and most preferably from about 0.03 to about 0.12 mole, per mole of non- photosensitive reducible silver salt.
- the silver halide used in the present invention may be chemically and spectrally sensitized in a manner similar to that used to sensitize conventional wet- processed silver halide photographic materials or state-of-the-art heat-developable photothermographic elements.
- it may be chemically sensitized with one or more chemical sensitizing agents, such as a compound containing sulfur, selenium, or tellurium, or with a compound containing gold, platinum, palladium, ruthenium, rhodium, iridium, or combinations thereof, a reducing agent such as a tin halide or a combination of any of these.
- chemical sensitizing agents such as a compound containing sulfur, selenium, or tellurium
- a reducing agent such as a tin halide or a combination of any of these.
- Suitable chemical sensitization procedures are also disclosed in US-A- 1,623,499, US-A-2,399,083, US- A-3, 297,447 and US-A-3, 297
- sensitizing dyes to the photosensitive silver halides provides high sensitivity to visible and infrared light by spectral sensitization.
- the photosensitive silver halides may be spectrally sensitized with various known dyes that spectrally sensitize silver halide.
- sensitizing dyes include cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styryl dyes, and hemioxanol dyes.
- the cyanine dyes, merocyanine dyes and complex merocyanine dyes are particularly useful.
- Suitable sensitizing dyes such as those described in US- A-3,719,495, US-A-5,393,654, US-A-5,441,866 and US-A-5,541,054 (Miller et al) are particularly effective.
- sensitizing dye added is generally about 10 "10 to 10 " mole, and preferably, about 10 " to 10 " moles per mole of silver halide.
- preferred infrared supersensitizers are described in EP-A-0 559 228 and include heteroaromatic mercapto compounds or heteroaromatic disulfide compounds of the formulae: Ar-S-M and Ar-S-S-Ar, wherein M represents a hydrogen atom or an alkali metal atom.
- Ar represents a heteroaromatic ring or fused heteroaromatic ring containing one or more of nitrogen, sulfur, oxygen, selenium, or tellurium atoms.
- the heteroaromatic ring comprises benzimidazole, naphthimidazole, benzothiazole, naphthothiazole, benzoxazole, naphthoxazole, benzoselenazole, benzotellurazole, imidazole, oxazole, pyrazole, triazole, thiazole, thiadiazole, tetrazole, triazine, pyrimidine, pyridazine, pyrazine, pyridine, purine, quinoline, or quinazolinone.
- compounds having other heteroaromatic rings are envisioned to be suitable supersensitizers.
- the heteroaromatic ring may also carry substituents.
- substituents are halogens (such as bromine and chlorine), hydroxy, amino, carboxy, alkyl groups (for example of 1 or more carbon atoms and preferably 1 to 4 carbon atoms) and alkoxy groups (for example of 1 or more carbon atoms and preferably of 1 to 4 carbon atoms).
- Most preferred supersensitizers are 2-mercaptobenzimidazole, 2-mercapto-5-methylbenzimidazole (MMBI), 2-mercaptobenzothiazole and 2-mercaptobenzoxazole (MBO).
- a supersensitizer is generally present in an emulsion layer in an amount of at least about 0.001 mole per mole of silver in the emulsion layer. More preferably, a supersensitizer is present within a range of about 0.001 mole to about 1.0 mole, and most preferably, about 0.01 mole to about 0.3 mole, per mole of silver halide.
- the non-photosensitive reducible silver source used in photothermographic elements can be any material that contains a source of reducible silver ions.
- it is a silver salt that is comparatively stable to light and forms a silver image when heated to 80°C or higher in the presence of an exposed photo- catalyst (such as silver halide) and a reducing agent.
- Silver salts of organic acids particularly silver salts of long-chain fatty carboxylic acids are prefened.
- the chains typically contain 10 to 30, and preferably 15 to 28, carbon atoms.
- Suitable organic silver salts include silver salts of organic compounds having a carboxyl group. Examples thereof include a silver salt of an aliphatic carboxylic acid and a silver salt of an aromatic carboxylic acid.
- silver salts of aliphatic carboxylic acids include silver behenate, silver arachidate, silver stearate, silver oleate, silver laurate, silver caprate, silver myristate, silver palmitate, silver maleate, silver fumarate, silver tartarate, silver furoate, silver linoleate, silver butyrate, silver camphorate, and mixtures thereof.
- Silver salts that can be substituted with a halogen atom or a hydroxyl group also can be effectively used.
- silver salts of aromatic carboxylic acid and other carboxyl group-containing compounds include, but are not limited to, silver benzoate, a silver- substituted benzoate, such as silver 3,5-dihydroxybenzoate, silver o-methylbenzoate, silver m-methylbenzoate, silver/, -methylbenzoate, silver 2,4-dichlorobenzoate, silver acetamidobenzoate, silver /?
- Silver salts of compounds containing mercapto or thione groups and derivatives thereof can also be used. Prefened examples of these compounds include, but are not limited to, a silver salt of 3-mercapto-4-phenyl-l,2,4-triazole, a silver salt of 2-mercaptobenzimidazole, a silver salt of 2-mercapto-5-aminothiadiazole, a silver salt of 2-(2-ethylglycolamido)benzothiazole, silver salts of thioglycolic acids (such as a silver salt of a S-alkylthioglycolic acid, wherein the alkyl group has from 12 to 22 carbon atoms), silver salts of dithiocarboxylic acids (such as a silver salt of dithioacetic acid), a silver salt of thioamide, a silver salt of 5-carboxylic-l-methyl- 2-phenyl-4-thiopyr
- a silver salt of a compound containing an imino group can be used.
- these compounds include but are not limited to, silver salts of benzotriazole and substituted derivatives thereof (for example, silver methylbenzotriazole and silver 5-chlorobenzotriazole), silver salts of 1 ,2,4-triazoles or 1 -H-tetrazoles as described in US-A-4,220,709, and silver salts of imidazoles and imidazole derivatives.
- silver salts of acetylenes can also be used, as described for example in US-A-4,761,361 and US-A-4,775,613.
- a prefened example of a silver half soap is an equimolar blend of silver carboxylate and carboxylic acid, which analyzes for about 14.5% by weight solids of silver in the blend and which is prepared by precipitation from an aqueous solution of the sodium salt of a commercial carboxylic acid.
- Transparent sheet materials made on transparent film backing require a transparent coating.
- a silver carboxylate full soap containing not more than about 15% of free carboxylic acid and analyzing about 22% silver, can be used.
- the silver halide and the non-photosensitive reducible silver source that form a starting point of development should be in catalytic proximity (i.e., reactive association).
- Catalytic proximity or “reactive association” means that they should be in the same layer, in adjacent layers, or in layers separated from each other by an intermediate layer having a thickness of less than 1 ⁇ m. It is prefened that the silver halide and the non-photosensitive reducible silver source be present in the same imaging layer.
- the source of reducible silver is preferably present in an amount of about 5% by weight to about 70% by weight, and more preferably, about 10% to about
- the reducing agent for the organic silver salt can be any material, preferably an organic material that can reduce silver ion to metallic silver.
- Hindered phenol reducing agents are prefened. These are compounds that contain only one hydroxy group on a given phenyl ring and have at least one additional substituent located ortho to the hydroxy group. Hindered phenol developers may contain more than one hydroxy group as long as each hydroxy group is located on different phenyl rings. Hindered phenol developers include, for example, binaphthols (that is dihydroxybinaphthyls), biphenols (that is dihydroxybiphenyls), bis(hydroxynaphthyl)methanes, bis(hydroxyphenyl)methanes, hindered phenols, and hindered naphthols each of which may be variously substituted.
- binaphthols include but are not limited to 1,1 '-bi- 2-naphthol, l,l '-bi-4-methyl-2-naphthol and 6,6'-dibromo-bi-2-naphthol.
- binaphthols include but are not limited to 1,1 '-bi- 2-naphthol, l,l '-bi-4-methyl-2-naphthol and 6,6'-dibromo-bi-2-naphthol.
- biphenols include but are not limited to 2,2'-dihydroxy- 3,3'-di-t-butyl-5,5-dimethylbiphenyl, 2,2'-dihydroxy-3,3',5,5'-tetra-t-butylbiphenyl, 2,2 ' -dihydroxy-3 ,3 ' -di-t-butyl-5 ,5 ' -dichlorobiphenyl, 2-(2-hydroxy-3 -t-butyl- 5-methylphenyl)-4-methyl-6- «-hexylphenol, 4,4'-dihydroxy-3,3 ',5,5'-tetra-t-butyl- biphenyl and 4,4'-dihydroxy-3,3',5,5'-tetramethylbiphenyl.
- Representative bis(hydroxynaphthyl)methanes include but are not limited to 4,4'-methylenebis(2-methyl-l-naphthol).
- Representative bis(hydroxynaphthyl)methanes include but are not limited to 4,4'-methylenebis(2-methyl-l-naphthol).
- bis(hydroxyphenyl)methanes include but are not limited to bis(2-hydroxy-3-t-butyl-5-methylphenyl)methane (CAO-5), l,l-bis(2-hydroxy- 3,5-dimethylphenyl)-3,5,5-trimethylhexane (NONOX or PERMANAX WSO),
- hindered phenols include but are not limited to
- hindered naphthols include but are not limited to
- amidoximes such as phenylamidoxime, 2- thienylamidoxime and p-phenoxyphenylamidoxime, azines (for example 4-hydroxy- 3,5-dimethoxybenzaldehydrazine), a combination of aliphatic carboxylic acid aryl hydrazides and ascorbic acid, such as 2,2'-bis(hydroxymethyl)propionylbetaphenyl hydrazide in combination with ascorbic acid, a combination of polyhydroxybenzene and hydroxylamine, a reductone and/or a hydrazine [for example, a combination of hydroquinone and bis(ethoxyethyl)hydroxylamine], piperidinohexose reductone or formyl-4-methylphenylhydrazine, hydroxamic acids (such as phenylhydroxamic acid, /?-hydroxyphenylhydroxamic acid, and -alaninehydr
- amidoximes such as phenylamidoxime
- Useful co-developer reducing agents can also be used as described for example in copending and commonly assigned U.S. Serial No.
- Y is H, a metal (preferably, an alkali metal, and more preferably, sodium or potassium), or an alkyl group (preferably, an alkyl group having from 1 to 4 carbon atoms, and more preferably, a methyl or ethyl group), and the solid curved line represents the atoms and bonds necessary to complete a ring structure that may include heteroatoms (for example N, O, S).
- the ring structure can include one or more rings, including pendant and fused rings.
- the compounds include one main five- or six-membered ring, which may include heteroatoms within the ring, and optionally have at least one pendant or fused ring attached to this main ring.
- the reducing agent (or mixture thereof) described herein is generally present as 1 to 10% (dry weight) of the imaging layer. In multilayer constructions, if the reducing agent is added to a layer other than an imaging layer, slightly higher proportions, of from about 2 to 15 weight % may be more desirable. Any co- developers may be present generally in an amount of from about 0.01%> to about 1.5% (dry weight) of the imaging layer coating.
- the photothermographic elements of the invention can also contain other additives such as shelf-life stabilizers, toners, development accelerators, acutance dyes, post-processing stabilizers or stabilizer precursors, and other image-modifying agents as would be readily apparent to one skilled in the art.
- the photothermographic elements of the present invention can be further protected against the production of fog and can be stabilized against loss of sensitivity during storage. While not necessary for the practice of the invention, it may be advantageous to add mercury (II) salts to the imaging layer(s) as an antifoggant.
- mercury (II) salts for this pu ⁇ ose are mercuric acetate and mercuric bromide.
- antifoggants and stabilizers which can be used alone or in combination, include thiazolium salts as described in US-A-2,131,038 and US-A- 2,694,716, azaindenes as described in US-A-2, 886,437, triazaindolizines as described in US-A-2,444,605, mercury salts as described in US-A-2,728,663, the urazoles described in US-A-3,287,135, sulfocatechols as described in US-A-3,235,652, the oximes described in GB 623,448, polyvalent metal salts as described in US-A- 2,839,405, thiuronium salts as described in US-A-3,220,839, palladium, platinum and gold salts as described in US-A-2,566,263 and US-A-2,597,915, and 2-(tribromo- methylsulfonyl)quinoline compounds as described in US-A-5,460
- Stabilizer precursor compounds capable of releasing stabilizers upon application of heat during development can also be used in combination with the stabilizers of this invention.
- Such precursor compounds are described in for example, US-A-5, 158,866, US-A- 5,175,081, US-A-5,298,390 and US-A-5,300,420.
- R represents alkyl or alkenyl groups of up to 20 carbon atoms, aryl, alkaryl, or aralkyl groups comprising up to 20 carbon atoms, aliphatic or aromatic heterocyclic ring groups containing up to 6 ring atoms or carbocyclic ring groups comprising up to
- antifoggants/stabilizers have the general structure:
- X is -O- or -S-
- Y is -NH 2 , -OH, or -O — M + wherein M + is a metal atom
- M + is a metal atom
- a toner can be present in an amount of about 0.01% by weight to about 10%, and more preferably about 0.1%) by weight to about 10% by weight, based on the total dry weight of the layer in which it is included.
- Toners are usually inco ⁇ orated in the photothermographic imaging layer. Toners are well known materials in the photothermographic art, as shown in US-A-3,080,254, US-A-3,847,612 and US-A- 4,123,282.
- toners include but are not limited to phthalimide and N-hydroxyphthalimide, cyclic imides (such as succinimide), pyrazoline-5-ones, quinazolinone, 1-phenylurazole, 3-phenyl-2-pyrazoline-5-one, and 2,4-thiazolidine- dione, naphthalimides (such as N-hydroxy-1 ,8-naphthalimide), cobalt complexes (such as cobaltic hexamine trifluoroacetate), mercaptans (such as 3-mercapto- 1 ,2,4-triazole, 2,4-dimercaptopyrimidine, 3-mercapto-4,5-diphenyl-l,2,4-triazole and 2,5-d
- 2,4-o-azolidinedione ⁇ 2,4-o-azolidinedione ⁇ , phthalazinone and phthalazinone derivatives, or metal salts or these derivatives [such as 4-(l-naphthyl)phthalazinone, 6-chlorophthalazinone,
- Binders The photosensitive silver halide, the non-photosensitive reducible source of silver, the reducing agent system, and any other additives used in the present invention are generally added to at least one binder.
- the binder(s) that can be used in the present invention can be employed individually or in combination with one another. It is prefened that the binder be selected from hydrophobic polymeric materials, such as, for example, natural and synthetic resins that are sufficiently polar to hold the other ingredients in solution or suspension.
- Examples of typical hydrophobic binders are polyvinyl acetals, polyvinyl chloride, polyvinyl acetate, cellulose acetate, polyolefms, polyesters, polystyrene, polyacrylonitrile, polycarbonates, methacrylate copolymers, maleic anhydride ester copolymers, butadiene-styrene copolymers and other materials readily apparent to one skilled in the art. Copolymers (including te ⁇ olymers) are also included in the definition of polymers.
- the polyvinyl acetals such as polyvinyl butyral and polyvinyl formal
- vinyl copolymers such as polyvinyl acetate and polyvinyl chloride
- the binder(s) should be able to withstand those conditions. Generally, it is prefened that the binder not decompose or lose its structural integrity at 120°C for 60 seconds, and more prefened that it not decompose or lose its structural integrity at 177°C for 60 seconds.
- the polymer binder(s) is used in an amount sufficient to carry the components dispersed therein that is within the effective range of the action as the binder.
- the effective range can be appropriately determined by one skilled in the art.
- a binder is used at a level of about 30% by weight to about 90% by weight, and more preferably at a level of about 45%> by weight to about 85% by weight, based on the total dry weight of the layer in which they are included.
- the formulation for a photothermographic imaging layer can be prepared by dissolving and dispersing the binder, the photosensitive silver halide, the non-photosensitive reducible source of silver, the reducing agent for the non-photosensitive reducible silver source, and optional addenda in an inert organic solvent, such as toluene, 2-butanone or tetrahydrofuran.
- Photothermographic elements can contain plasticizers and lubricants such as polyalcohols and diols of the type described in US-A-2,960,404, fatty acids or esters such as those described in US-A-2, 588,765 and US-A-3, 121,060, and silicone resins such as those described in GB 955,061.
- the elements can also contain matting agents such as starch, titanium dioxide, zinc oxide, silica, and polymeric beads including beads of the type described in US-A-2,992,101 and US-A-2,701,245.
- the photothermographic elements can include antistatic or conducting layers. Such layers may contain soluble salts (for example chlorides or nitrates), evaporated metal layers, or ionic polymers such as those described in US-A-2,861,056 and US-A-3,206,312, or insoluble inorganic salts such as those described in US-A- 3,428,451. Other antistatic agents are well known in the art.
- the photothermographic elements may also contain electroconductive underlayers to reduce static electricity effects and improve transport through processing equipment. Such layers are described in US-A-5,310,640.
- the photothermographic elements can be constructed of one or more layers on a support.
- Single layer elements should contain the silver halide, the non- photosensitive reducible silver source material, the reducing agent for the non-photosensitive reducible silver source, the binder, as well as optional materials such as toners, acutance dyes, coating aids and other adjuvants.
- Two-layer constructions (having two distinct layers on the support) preferably contain silver halide and non-photosensitive reducible silver source in one emulsion layer (usually the layer adjacent to the support) and the reducing agent system and other ingredients in the second layer or distributed between both layers. If desired, the developer and co-developer may be in separate layers. Two layer constructions comprising a single imaging layer coating containing all the ingredients and a protective topcoat are also envisioned.
- Photothermographic formulations described can be coated by various coating procedures including wire wound rod coating, dip coating, air knife coating, curtain coating, slide coating or extrusion coating using hoppers of the type described in US-A-2,681,294. It is prefened that two or more layers (such as the "first" and “second” layers described above) can be coated simultaneously by the procedures described in US-A-2,761,791, US-A-4,001,024 (Dittman et al), US-A-4,569,863 (Keopke et al), US-A-5,340,613, US-A-5,733,608 (Kessel et al), US-A-5,849,363 (Yapel et al), US-A-5,843,530 (Jerry et al), US-A-5,861,195 (Bhave et al) and GB 837,095.
- two or more layers can be coated simultaneously by the procedures described in US-A-2,761,791, US-A-4,001,0
- Atypical coating gap for the emulsion layer can be from about 10 to about 750 ⁇ m, and the layer can be dried in forced air at a temperature of from about 20°C to about 150°C. It is prefened that the thickness of the layer be selected to provide maximum image densities greater than about 0.2, and more preferably, from about 0.5 to about 5.0, as measured by a MacBeth Color Densitometer Model TD 504.
- the "canier" layer formulation comprise a single phase mixture of the two or more polymers described above.
- two or more layers are applied to a film support using slide coating.
- the first layer can be coated on top of the second layer while the second layer is still wet.
- the first and second fluids used to coat these layers be the same organic solvents (or organic solvent mixtures), or essentially the same solvents. If there is any water in the solvent mixtures, it comprises less than
- the wet coating thickness of the adhesion-promoting layer (“second" or “fourth” layer) is generally less than 50 ⁇ m, and preferably from about 0.1 to about 20 ⁇ m. While the first and second layers can be coated on one side of the film support, the method can also include forming on the opposing side of said polymeric support,
- the first layer can be a photothermographic imaging layer
- the third layer can be an antihalation layer, an antistatic layer, or a layer containing a matting agent (such as silica).
- the first and second layers of such elements can comprise a polyvinyl acetal or a polyester resin
- the third and fourth layer can independently comprise a polyester resin or a cellulosic polymer.
- the polymer-containing layer is an "antihalation layer" comprising one or more compounds (for example, antihalation dyes) that provide antihalation characteristics.
- antihalation dyes and antihalation dyes may also be inco ⁇ orated into an antihalation layer according to known techniques.
- the photothermographic elements of this invention contain an antihalation coating on the support opposite to the side on which the imaging layer and topcoat layers are coated.
- Antihalation and acutance dyes useful in the present invention are described in US-A-5, 135, 842, US-A-5,266,452 US-A- 5,314,795 and US-A-5,380,635. While the imaging elements of the present can be imaged in any suitable manner consistent with the type of material using any suitable imaging source (typically some type of radiation or electronic signal), the following discussion will be directed to the prefened photothermographic elements.
- the latent image can be developed by heating the exposed element at a moderately elevated temperature of, for example, from about 80 to about 250 °C (preferably from about 100 to about 200°C) for a sufficient period of time, generally from about 1 to about 120 seconds. Heating can be accomplished using any suitable heating means such as a hot plate, a steam iron, a hot roller or a heating bath.
- the development is canied out in two steps. Thermal development takes place at a higher temperature for a shorter time (for example at about 150°C for up to 10 seconds), followed by thermal diffusion at a lower temperature (for example at about 80°C) in the presence of a transfer solvent.
- the second heating step prevents further development and allows the dyes that are already formed to diffuse out of a photosensitive imaging layer into a receptor layer.
- a photothermographic emulsion coating formulation was prepared using a silver salt homogenate prepared as described in Col. 25 of US-A-5,434,043 (noted above), inco ⁇ orated herein by reference. This formulation was then prepared as described in Cols. 19-24 of US-A-5, 541,054 (Miller et al), also inco ⁇ orated herein by reference.
- a topcoat formulation was prepared for application over the photothermographic emulsion formulation with the following components: 2-Butanone (methyl ethyl ketone, MEK) 86.1 weight %
- Antihalation dye* 0.21 weight %
- Ethyl-2-cyano-3-oxobutanoate 0.23 weight % * This compound is l,3-bis[2,3-dihydro-2,2-bis[[(l- oxohexyl)oxy]methyl]-lH-perimidin-6-yl]-2,4-dihydroxy-, bis (inner salt).
- An antihalation layer formulation was similarly prepared using the following components: 2-Butanone (methyl ethyl ketone, MEK) 88.7 weight %
- PE2200 polyester (Bostik Inc.) 0.1602 weight %
- Antistatic agent** 1.221 weight %
- BL16, BN' 18, “LL4150” and “BS18” represent various poly(vinyl butyral) products available from Wacker Chemical Company.
- a "cross-hatch" adhesion test was performed according to ASTM D3359-92 A in which a coated film was cut with a razor blade in a cross-hatched pattern, a piece of commercially available 3M #610 tape was placed on the pattern and then quickly lifted off. The amount of coating left on the film is the measure of adhesion and was rated on a scale of 0 (worst, more than 65% coating removed) to 5
- Edge delamination is also a measure of adhesion.
- a coated film is slit using a conventional slitting knife, and a microscope is used to measure the length (mm) of coated film that has been lifted off the film by the slitting action.
- the acceptable edge delamination is less than 0.10 mm.
- “Starry night” is a defect indicative of a lack of density in an imagewise exposed (for example, 815 nm laser) and heat-processed photothermographic film element.
- the defect is evaluated at 5 OX magnification and given a rating of 1 (severe) to 10 (no defect).
- the acceptable defect evaluation is "7" which is considered “visual comparison standard”.
- Haze is measured by conventional methods using a commercially available Gardner Hazemeter. The lower the amount of haze, the better.
- Adhesion-promoting polymers useful in the present invention were identified as follows. First of all, polymers (adhesion-promoting or "first" polymers) that adhere to a polyester film support, for example PET, were identified by coating a solution (10 weight %) of the polymer in MEK onto bare polyester film, dried and tested for adhesion as described in ASTM D3359-92a. Secondly, a solution of the tested polymer was blended in a solution of a film-forming polymer to be used in the layer to be adhered to the film support in a suitable solvent for both polymers. The ratio of the two polymers in the resulting solution and the coating weights of each were adjusted so that when a coating was dried, the polymer blend would adhere to the polyester film support.
- This second adhesion evaluation ranged from “0" (less than 35%o adhering to the support) to "5" (perfect adhesion). After suitable adhesion-promoting polymers were selected, the % solids of the polymer blend was adjusted to obtain the desired rheology for coating.
- PE2200 polyester resin was coated out of MEK (38% solids) as a "canier" layer underneath the photothermographic emulsion layer, followed by the topcoat. All of the experiments showed that the use of PE2200 polyester resin as an adhesion-promoting layer at a variety of thickness' provided improved cross-hatch adhesion (2-3 ratings) but delamination was very poor (0.2-0.7 mm). The photothermographic imaging layer did not adhere well to the layer below even though the lower layer adhered well to the polyester film support.
- the photothermographic imaging layer formulation was diluted prior to coating (from 37% to 15% solids) to form a canier layer containing PE2200 polyester resin (similar to Comparative Example 1).
- the photothermographic formulation also included poly( vinyl butyral) (BL16) as the binder material for the emulsion.
- BL16 poly( vinyl butyral)
- TABLE II below shows the results obtained.
- the addition of PE2200 polyester resin to the imaging layer increased the level of starry night effect as the PE2200 polyester resin coverage was increased. It is believed that this effect is caused by the formation of "gels" from the polyester resin. Adhesion was not affected in any way in these experiments.
- MEK was coated as a canier layer underneath the photothermographic imaging layer.
- the problem observed in this experiment was what is known as the "strike through” problem that is described in US-A-5, 861,195 (Bhave et al). There was no improvement in adhesion properties.
- An adhesion-promoting layer (coated as a canier layer) comprising a heterogeneous mixture of PE2200 polyester resin and BL16 poly(vinyl butyral) at various weight ratios and coating thickness was coated (10% solids) out of MEK.
- a photothermographic imaging layer using the formulation described above.
- Carrier layer was diluted photothermographic emulsion formulation (15% solids) containing 0.54/99.46 weight ratio of PE2200 to BL16. ** Average of three samples.
- Example 1 The experiments of Example 1 were repeated on a production coating machine and the coated elements were slit using production slitting or chopping operations. However, small amounts of high molecular weight polyester resin were allowed to settle out of the adhesion-promoting layer formulation before coating thereby providing a single phase mixture of polymers for coating.
- This example demonstrates the use of the prefened adhesion- promoting as a canier layer underneath a photothermographic imaging layer.
- the adhesion-promoting layers comprised single phase mixtures of a polyester resin (PE5833 available from Bostik) and poly( vinyl butyral) (BN18) at various weight ratios and coating thickness'.
- the photothermographic imaging layer was formulated as described above without the addition of PE2200 polyester resin. The results of various evaluations are provided in TABLE V below, demonstrating improved cross-hatch adhesion as well as an improved resistance to delamination.
- This example demonstrates the use of an adhesion-promoting layer underneath a non-imaging layer, in this case an antihalation layer.
- a poly(ethylene terephthalate) film support was coated as described in TABLE VI below with the antihalation layer formulation described above.
- the adhesion-promoting layers comprised a single phase mixture of polymers in all cases.
- This example demonstrates the use of a prefened adhesion-promoting layer as a canied layer underneath another non-imaging layer, that is an antistatic (matte-containing) layer typically provided on the backside of a photothermographic element of this invention.
- a poly(ethylene terephthalate) film support was coated with the following formulations using the various polymers ratios described in TABLE VII below to provide single phase polymer mixtures. The results are also shown in TABLE VII.
- the adhesion-promoting layer formulation contained the following:
- Antihalation dye* 0.47 weight %
- An antihalation layer formulation was similarly prepared using the following components:
- Antistatic agent** (as described above) 1.35 weight % TABLE VII
- Photothermographic elements of this invention were prepared as described in Example 3 above except that the adhesion-promoting layers were formulated using various mixtures of polymers. Some of the polymer mixtures were single phase (homogeneous) while others were multi-phase (heterogeneous). The polymer mixtures used and the various weight ratios are shown in TABLE VIII below.
- Articles of this invention were prepared as described in Example 5 above except that the adhesion-promoting layers were formulated using various mixtures of polymers. All of the polymer mixtures were single phase (homogeneous). The polymer mixtures used and the various weight ratios are shown in TABLE IX below.
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WO2009120646A1 (en) * | 2008-03-26 | 2009-10-01 | 3M Innovative Properties Company | Methods of slide coating fluids containing multi unit polymeric precursors |
BRPI0910877A2 (pt) * | 2008-03-26 | 2015-10-06 | 3M Innovative Proferties Company | método para aplicar dois ou mais fluidos como um revestimento de deslizamento |
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US5468603A (en) * | 1994-11-16 | 1995-11-21 | Minnesota Mining And Manufacturing Company | Photothermographic and thermographic elements for use in automated equipment |
US5525376A (en) | 1995-02-02 | 1996-06-11 | Minnesota Mining And Manufacturing Company | Multiple layer coating method |
BR9510445A (pt) | 1995-02-02 | 1998-05-19 | Minnesota Mining & Mfg | Processo e aparelho para revestir um substrato |
AU4283396A (en) | 1995-02-02 | 1996-08-21 | Minnesota Mining And Manufacturing Company | Method and apparatus for applying thin fluid coatings |
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JPH09297366A (ja) * | 1996-05-02 | 1997-11-18 | Fuji Photo Film Co Ltd | 熱現像感光材料 |
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US5861195A (en) | 1997-01-21 | 1999-01-19 | Minnesota Mining And Manufacturing Company | Method for coating a plurality of fluid layers onto a substrate |
US5843530A (en) | 1997-01-21 | 1998-12-01 | Minnesota Mining And Manufacturing Company | Method for minimizing waste when coating a fluid with a slide coater |
-
2000
- 2000-02-23 US US09/510,648 patent/US6355405B1/en not_active Expired - Lifetime
- 2000-02-24 WO PCT/US2000/004693 patent/WO2000050957A1/en active Application Filing
- 2000-02-24 JP JP2000601494A patent/JP2002542961A/ja active Pending
- 2000-02-24 EP EP00913593A patent/EP1163551A1/en not_active Withdrawn
-
2001
- 2001-11-01 US US10/002,216 patent/US6436622B1/en not_active Expired - Fee Related
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US4477562A (en) * | 1983-05-24 | 1984-10-16 | Minnesota Mining And Manufacturing Company | Dry strip antihalation layer for photothermographic film |
US5223384A (en) * | 1991-04-22 | 1993-06-29 | Konica Corporation | Heat-developable light-sensitive material |
WO1996015478A2 (en) * | 1994-11-16 | 1996-05-23 | Minnesota Mining And Manufacturing Company | Photothermographic element with improved adherence between layers |
EP0810467A1 (en) * | 1996-06-01 | 1997-12-03 | Agfa-Gevaert N.V. | (Photo)thermographic material with improved transport performance |
Non-Patent Citations (1)
Title |
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See also references of EP1163551A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20020061479A1 (en) | 2002-05-23 |
JP2002542961A (ja) | 2002-12-17 |
WO2000050957A8 (en) | 2001-02-08 |
US6436622B1 (en) | 2002-08-20 |
US6355405B1 (en) | 2002-03-12 |
EP1163551A1 (en) | 2001-12-19 |
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