DE2946204C2 - Coating solution and using an adhesive coated polyester base - Google Patents

Description

2. Coating solution according to claim 1, characterized in that it contains a surface-active agent is.

3. Photographic polyester base with an adhesive layer containing a copolymer Contains glycidyl acrylate and / or glycidyl methacrylate units, characterized in that the Mixed polymer composed as a percentage of the following units:

a) 35 to 55% by weight of glycidyl acrylate and / or glycidyl methacrylate

b) 20 to 55% by weight of n-butyl acrylate

c) 10 to 30% by weight of styrene and / or sr-methylstyrene.

4. Photographic polyester film base according to claim 3, characterized in that the Mixed polymer composed as a percentage of the following units:

a) 35 to 55% by weight of glycidyl acrylate and / or glycidyl methacrylate

b) 30 to 50% by weight of n-butyl acrylate

c) 10 to 30% by weight of styrene and / or ar-methylstyrene.

5. Photographic polyester film base according to claim 4, characterized in that the Mixed polymer composed as a percentage of the following units:

a) 40 to 50% by weight of glycidyl acrylate and / or glycidyl methacrylate

b) 30 to 50% by weight of n-butyl acrylate

c) 10 to 30 wt -.% styrene and / or Λ-methylstyrene.

6. Photographic polyester support according to claim 5, characterized in that the Mixed polymer composed as a percentage of the following units:

a) 40 to 50% by weight of glycidyl acrylate and / or glycidyl methacrylate

b) 30 to 50% by weight of n-butyl acrylate

c) 15 to 25% by weight of styrene and / or α-methylstyrene.

50

55

65 tel containing gelatin coating compound, a gelatin-containing coating compound preventing the film from rolling up for the back of the substrate, a gelatin coating compound for forming a second adhesion-promoting layer, and the substrate.

Polyester, e.g. B. polyethylene terephthalate, are often used as starting materials for the production of photographic substrates (hereinafter referred to as "polyester substrates" because they have excellent physical properties, e.g. transparency, flexibility, exhibit. However, because of their crystalline structure, polyester substrates are highly hydrophobic Properties and only a low affinity for hydrophilic substances, such as photographic gelatin coating compositions, to be applied to the polyester base. Prepared for this reason it is difficult to apply gelatin photographic coatings to polyester substrates. Even if there is a photographic gelatin coating composition can be applied to polyester backing, the applied layer of the coating compound in question tends to detach from the carrier, since the Adhesion between the photographic gelatin composition and the polyester base is only weak.

For this reason, polyester supports were used prior to the application of a photographic gelatin composition already provided with an adhesive layer. Thus, light-sensitive photographic recording materials those on the polyester film base provided with a subbing layer a photographic gelatin coating composition is applied to meet the requirements of the end user, one must between the photographic gelatin coating composition and the polyester base provided with an adhesive layer produce and maintain such a firm bond that they can operate in a wide variety of wet conditions during development as well as in the dry state before and after development including processing in able to withstand mechanical device. To meet these requirements, Hie various measures tested and trials carried out. For example, there is a procedure for which has a first layer on a polyester base with good adhesion to the polyester base and a gelatin or gelatin as the second adhesion-promoting layer on the first adhesion-promoting layer a layer containing a hydrophilic high molecular substance is produced. Furthermore gi <; '. there is a procedure in which a polyester backing having a single release agent layer, one on the polyester backing high molecular weight hydrophobic component adhering; and one to a gelatin photographic coating composition containing adhesive hydrophilic component coated.

Furthermore, there are a number of methods of adhesion enhancement treatment of polyester layer supports (see, for example, US-PS 30 53 661 and 35 06 445 and JA-OS 18 642/1967 and 14 434/1973). Here will be by dissolving a copolymer with an affinity for polyester substrates as well as for photographic ones Gelaline coating masses in organic solvents Coating solutions (for the formation of Adhesive layers) prepared, if necessary after the addition of solvents or swelling agents for polyester layers applied to the polyester backing. The adhesive layers formed in this way can be used to Adhesion between the polyester backing and the

photographic gelatin coating composition to enhance.

In those processes that use coating solutions containing organic solvents however, the most diverse plants including contempt for the recovery of vapors of the organic solvents used. So that the workers do not harm their health during the production process exposed to organic solvent vapors or harmful organic Solvents that have to be released into the atmosphere are for reasons of occupational hygiene or avoidance of environmental pollution requires large investment costs. There are also cases in which production is severely restricted due to the risk of fire. If finally solvents or swelling agents are used for polyester backings, the polyester backings often lose their transparency or evenness, so that ultimately the quality of the end products containing these substrates worsened.

For these reasons, the most diverse measures have been taken taken to counter the disadvantages described. Aqueous coating solutions were used here (to create adhesive layers) with copolymers with a wide variety of monomer units used. It is known, for example, from US Pat. No. 3,615,556, biaxially stretched Polvesterschichtträger with an aqueous coating solution with a butadiene / styrene copolymer with acidic components to coat. From US-PS 26 27 088 and 26 98 240 processes are known in which polyester layer support before; · stretching with aqueous coating solutions with vinylidene-type copolymers be subjected to an adhesion-promoting treatment with acidic components. Ai ". The JA-OS 13 278/1969 and 10 998/1970 are. Procedure known in which biaxially oriented polyester substrate with aqueous coating solutions with copolymers of alkyl acrylates and aliphatic bifunctional monomers with 2 allyl groups or 2 vinyl groups be subjected to a bonding treatment.

In the case of processes in which the polyester backing is carried out before stretching or after a monoaxial stretching Liability mediation treatment are subject to, in practice, however, difficulties arise insofar as that these substrates are stretched for the first time or again after the adhesion treatment. As a result, the ends or edges of the substrate to which the substrate is clamped during stretching are not used for any purpose, which increases the cost dramatically. Even with the It prepares a bonding treatment for biaxially stretched polyester substrates Difficulties in finding suitable co-polymers containing aqueous coating solutions and conditions, among which the adhesion promoting treatment is to be selected, so that those containing the copolymers Aqueous coating solutions coated polyester substrates also have the desired good adhesion properties This is due to the fact that the polyester support has a crystalline structure and are highly hydrophobic.

Attempts have also been made to initially apply a surface treatment to the polyester layer carrier, z. B. a corona discharge or irradiation with UV light, and then on the treated surface with adhesion-promoting coating solutions to coat. When conducting such a liability mediation process using aqueous coating solutions containing copolymers the adhesion between polyester layer supports and hydrophilic layers to be formed thereon can be reduced greatly improve. Presumably, the surface treatment described forms on the surface hydrophobic polyester backing polar groups or

ίο there is an increase in the networking density of the Surfaces, whereby the affinity to in adhesion-promoting Coating solutions containing components with polar groups increased. In any case an increase in the adhesive strength is achieved here.

An example of such an adhesion promoting process is known from JA-OS 11 118/1974. Here, a polyester substrate, which has been subjected to a surface treatment, is coated with an aqueous coating solution containing copolymers and then coated with a photographic gelatin coating material. The photographic light-sensitive materials thus obtained show excellent adhesive properties.
With regard to edge peeling, which occurs particularly when the developing treatment of light-sensitive photographic recording materials is carried out in an automatic developing device, it is particularly unfavorable for light-sensitive photographic recording materials having a substrate which has been subjected to an adhesion promoting treatment with a copolymer-containing aqueous coating solution In appearance. "Edge detachment" is to be understood as meaning that a silver halide emulsion layer or backing layer of a light-sensitive photographic recording material is detached from the support in the wet state during the development treatment. A specific disadvantage that can be traced back to this edge detachment is that when a light-sensitive photographic recording material is developed, for example in an automatic developing device, the peripheral portion or edge portion of the photographic recording material is detached from the substrate as a result of friction with a transport frame or a rubber roller of the device, so that the quality of the treated photographic material is often impaired.

From the JA-OS 1 04 913/1977 is a liability mediation procedure known, in which the problem of edge detachment is solved. Required in this procedure however, a layer of colloidal silica is used as the second adhesive layer, if between hydrophobic Supports including polyester supports and photographic gelatin coating compositions a particularly strong adhesion, especially a special one solid dry adhesion before and after development. One does not achieve a sufficient one Adhesion, if the second adhesive layer consists of a gelatin layer used in common catfish or when only a single and no second adhesive layer is formed.

When in aqueous coating solutions containing copolymers as an adhesion promoter, compounds with methylsulfonyloxy or ethylene imine groups (compounds, which have proven to be very effective in terms of improving adhesion) are used, there are other disadvantages. One of the disadvantages is that in the course of the tent

tion of the mixed polymer containing aqueous coating solutions containing these compounds because of the high reactivity of these compounds a reaction of the compounds in question with the copolymer components or between these connections expires. It has now been shown that, due to these reactions, the compounds in question after a certain storage time no adhesion-promoting effect in the coating of Polyester backings with copolymers Exercise more aqueous BeschichungsiSsungen. In particular it has been shown that after the addition of such adhesion promoters Compounds to aqueous coating solutions containing copolymers impair the pot life will. Another disadvantage is that some time after the adhesion promoting treatment the liability also deteriorates if it was previously due to the mediation treatment in The presence of the adhesion promoters was good and, for example, silver halide photographic emulsion layers or gelatin backing layers adhere well to the base. This disadvantage is particularly evident when the second adhesive layer is a gelatin-containing layer Layer is applied. This is probably due to it attributed that - since the compounds used as adhesion promoters also hardeners for gelatin represent - unreacted adhesion promoters still present in the adhesive layer containing the copolymer migrate under diffusion into the second adhesion-promoting gelatin layer and there the gelatin Harden and crosslink far more than necessary. For this reason, the harder second adhesive layer is then (only) insufficiently anchored to the photographic silver halide emulsion layer or gelatin backing layer (which is why liability is impaired). From the JA-OS 22 735/1978 is a liability mediation procedure known in which the disadvantages of the adhesion promoting treatment carried out with curing agents should be solved. In this process, however, the surface of the copolymer-containing adhesion-promoting agent must be used Layer can be modified by means of corona discharge.

The aqueous coating solutions containing copolymers used in accordance with JA-OS 104 913/1977 leave the copolymer-containing adhesion-promoting layers produced therewith as a result of the layers contained therein Components become cloudy. Those with such an aqueous coating solution subjected to an adhesion promoting treatment Subjected photographic polyester substrates have been found in some F.Hiles as for Proven to be unsuitable for photographic purposes.

Under these circumstances, there is a great demand for polyester supports for photographic use Purposes that are characterized by excellent properties and not with the disadvantages of the known, an adhesion-promoting treatment subjected polyester backing are affected.

The invention is thus based on the object of providing photographic polyester support provided with an adhesive layer without using harmful organic solvents to create those between the Base and a photographic gelatin sizing composition applied thereon both in dry as well as in the wet state an acceptable adhesion can be achieved and which do not show any edge loosening. Furthermore should here be on the use of adhesion promoters or on the implementation of a corona discharge treatment the polymer-based adhesive layer can be dispensed with. This should also apply in particular, if only one adhesive layer is applied to the polyester backing. Furthermore, should also be with already Aqueous coating solutions containing copolymers that have been stored for a long time to form the adhesive layer coated polyester backings do not change or lose their adhesive properties. In the invention to be created, subjected to an adhesion promoting treatment, should the ίο The adhesive layer should be extremely transparent and its adhesive properties over time after the adhesion promoting treatment not lose. The adhesive layer should in particular ensure good photographic adhesion Silver halide emulsion layers and gelatin backing layers on the polyester support guaranteed.

According to the invention, the stated objects can be achieved by applying a polyester layer support on its surface to form an adhesive layer with an aqueous coating solution with a copolymer, with (a) 35 to 55% by weight of glycidyl acrylate and / or glycidyl methacrylate units, (b) 20 to 55 % by weight of n-butyl acrylate units., And (c) 10 to 30% by weight of styrene and / or ar-methylsty: fineness, coated. In the order given, the various monomers are referred to as the first, second and third components.

The polyester layer supports which can be used according to the invention are made from aliphatic diols and aromatic diols Dicarboxylic acids produced. A typical example of this is a polyethylene terephthalate support. According to the invention Polyester layer supports which can be used with preference are those which have been biaxially oriented and thermally fixed. Furthermore, the polyester supports can be transparent and, if necessary, photographically inert Contain dyes, for example blue dyes for X-ray films. Before coating the polyester backing with the copolymer-containing aqueous coating solution used to form the adhesive layer the substrate surface is preferably subjected to a hydrophilization treatment by suitable pretreatment subject. Suitable pre-treatment measures are a corona discharge treatment, exposure to UV light or damming. This is where the wetting and adhesive properties with regard to the polyester: layer support improved.

The copolymers which can be used according to the invention are obtained by aqueous emulsion polymerization of the three monomeric components mentioned. The copolymers which can be used according to the invention can within a range in which the properties of the copolymer that are aimed at according to the invention are found do not change the fourth component of an acrylic or methacrylic acid derivative that differs from the first or second component differentiates, an itaconic acid or maleic anhydride derivative, vinyl chloride or Contain vinylidene chloride.

The adhesion effect of the invention be used according to ^b0 cash interpolymers is due to the combination of said d; Ji components attributed. The copolymers which can be used according to the invention have particularly good properties for photographic purposes.

Because of the presence of an epoxy group in the molecule, the first component, i. H. the glycidyl acrylate and / ou: r glycidyl methacrylate, a crosslinking of the copolymer In the adhesive layer, what to do with it

leads to the fact that the adhesive layer becomes more and more water-resistant as the content of the first component increases. The consequence of this is that the adhesion between the polyester backing and the adhesive layer is not impaired even in the wet state. This is due to the fact that the swelling of the adhesive layer is retarded by the water present, namely in that the water which is present in the wet state during the development of the light-sensitive photographic recording material is prevented from penetrating into the adhesive layer. Thus, the first component positively affects the wet adhesion properties including edge peeling of the photographic light-sensitive material during development. In this case, however, if the content of the glycidyl acrylate and / or glycidyl methacrylic units exceeds 55% by weight, the dry film adhesion of the photographic light-sensitive material before and after the development becomes insufficient. On the other hand, if the content of the first component falls below 35% by weight, the dry film adhesion of the photographic light-sensitive material similarly becomes insufficient. Accordingly, the monomeric glycidyl acrylate and / or Glycidylmeihacrylat must in an amount of 35 to 55, are preferably used 2 of 40 to 50 wt o ^C.

The second component, ie the n-butyl acrylate monomer, provides a polymer of high viscosity. In the copolymer that can be used according to the invention, the second component contributes to a large extent to the strength wedge on the polyester layer carrier Dry film adhesion before and after development of the photographic light-sensitive material n. On the other hand, if the content of n-butyl acrylate components rises above 55% by weight, the formed adhesive layer becomes quite soft, so that it is on the substrate surface when a further layer is subsequently applied adhesion-promoting layer to a block formation occurs. Hin so with an adhesive layer-provided polyester base is of no practical use value. Consequently, so must the n-Butyl acrylate monomers in an amount of 20 to 55 wt ^1V used reach. Even better results can be reached, when the amount of the n-butyl acrylate monomer is 30 to 55% by weight amounts to. When the n-butyl acrylate monomer is substituted by a branched chain monomer such as isobutyl acrylate, sec-butyl acrylate or tert-butyl acrylate, or by a monomer having an alkyl group in the rare chain, e.g. B. n-butyl methacrylate is replaced, the dry film adhesion of the photosensitive photographic recording material ultimately obtained is poor, ie a replacement of the n-butyl acrylate monomer by a monomer of the types mentioned is not recommended.

The adhesive layer acquires better transparency as the content of the Jrilten component increases; H. Styrene and / or ar-methylsiyrene in the range from 10 to 30 Wt .- *. The result of this is that the optical properties of the adhesive layer Substrate are excellent in photographic use. Furthermore, the film strength is also increased Improvement in scratching properties increased. Finally, the transition temperature of the second also rises Order of the copolymer while improving the blocking properties. However, if the salary on the styrene and / or ar-methylstyrene units 30 Wt .- '\, the dry film adhesion of the decreases photosensitive pholographic recording material before and after the development treatment or the adhesive layer formed on the polyester support will turn on due to their poor film formation opaque and cloudy (so that the optical properties of the air-layered cover get worse with photographic use). Consequently, must therefore be used according to the invention Copolymer contain 10 to 30, preferably 15 to 25 wt .-% styrene and / or ar-methylstyrene units. Since an epoxy group in the catfish described reacts with crosslinking, the molecular weights can be the copolymers which can be used according to the invention cannot be specified precisely, they presumably lie but over 10,000.

The in the inventive copolymers Copolymers contained in aqueous coating solutions are prepared in the manner described below produced by an emulsion polymerization process. Consequently, those that can be insulated according to the invention are curdled Copolymers in the form of aqueous dispersions of particulate Emulsion polymers, d. H. in the form of so-called latices. Those which can be used according to the invention Copolymers are obtained, for example, by the following process: One with a reflux condenser A flask equipped with an emulsion polymerization surfactant, for example sodium dodecylbenzenesulfonate, a polymerization initiator, e.g. B. ammonium persulfate, and a polymerization promoter, for example sodium hydrogen sulfite, and if necessary with a molecular weight control agent added, whereupon the contents of the flask are brought to a temperature of about 80 ° C. After that will be into the flask dropwise with stirring the monomer components introduced for the copolymer, the polymerization getting started. Ultimately an aqueous dispersion of the copolymer formed is obtained. The amount of used in the reaction surface-active agent is, based on the amount of the monomeric copolymer components, less than 5, preferably 1 to 2% by weight. The particle size of the copolymer in the dispersion is preferably in the order of 0.15 μm. however, depending on the amount of surfactant used and the synthesis conditions, z. B. the adhered stirring conditions and polymerization temperatures, to be different. The aqueous copolymer containing copolymer used according to the invention Coating solution is also obtained by dissolving a surfactant for emulsion polymerization and the monomeric first, second and <Htten components in a suitable solvent. Charging the resulting solution with an amount of one necessary to initiate the polymerization Polymerization initiator, heating the solution, and then allowing the reaction solution to stand for several hours. Thereafter, the resulting reaction solution is vigorously mixed with an aqueous solvent, whereby then the desired copolymer-containing aqueous coating solution is obtained.

As already mentioned, the copolymer-containing aqueous solution prepared in the manner described falls Coating solution in the form of an aqueous dispersion. It can be as it is or, if necessary, after Addition of organic solvents or surface-active agents used to produce an adhesive layer will.

In the following the production of In aqueous Mixed polymer coating solutions according to typical mixed polymers which can be used according to the invention and comparative copolymers (which - since prepared accordingly - are also obtained in the form of aqueous dispersions of particulate emulsion polymers were) explained in more detail '. trt.

Manufacturing process I

(Preparation of compounds (I) to (6) and comparative compounds (1) to (4) according to the following Table 1)

Table I.

After the
position example I
obtained aqueous
Mixed polymer
dispersion in the preparation of
of mixed poly
merisats used
Monomer used
Amount of
added
Monomers
in g Connection (I) n-butyl acrylate
Glycidyl methacrylate
Styrene 20th
50
30th Connection (2) n-butyl acrylate
Glycidyl methacrylate
Styrene 40
40
20th Connection (3) n-butyl acrylate
Glycidyl methacrylate
Styrene 30th
40
30th Connection (4) n-butyl acrylate
Glycidyl methacrylate
Styrene 55
35
10 Connection (5) n-butyl acrylate
Glycidyl methacrylate
α-methyl styrene 55
35
10 Connection (6) n-Buiylacfyiät
Glyctdylacrylat
Styrene 30th
40
30th Comparison
connection (1) n-butyl acrylate
Glycidyl methacrylate
Styrene 30th
60
10 Comparison
connection (2) n-butyl acrylate
Glycidyl methacrylate
Styrene 50
20th
30th Comparison
connection (3) n-butyl acrylate
Glycidyl methacrylate
Styrene 10
50
40 Comparison
connection (4) n-butyl acrylate
Glycidyl methacrylate 60
40

loaded. Finally, according to Table I, the specified monomers in an amount correspond to one tenth of the specified amounts added. As soon as the polymerization starts, the addition for Interrupted for 10 min. After that, the remaining Monomers allowed to drop in at a given rate within 50 min. By cooling the Temperature in the flask contents so far controlled that they during the dropwise addition of the monomers

ίο which itself would result in violent heating as a result of the heat of polymerization. Always at 80 "C remain. After the end of the dropwise addition of the monomers, the whole is under the given conditions for 4 hours let react further. After that is the polymerization practically finished. The copolymer obtained in the catfish described is always obtained as an aqueous dispersion of a particulate emulsion polymer. Their solids concentration ranges from 32 to 33% by weight. Their surface tension at 25 ⁰ C easily from 45 to 52 dynes / cm. The degree of polymerization is over 96%. The particle size determined by cickircricrsrri'.kfcskcplsche observation is in the range of 0.1 µm. Of the copolymers obtained, the Determined content of epoxy groups. Based on the from The value calculated for the added amount of glycidyl acrylate or glycidyl methacrylate is this measured value each in the range from 93 to 98%.

The resulting aqueous Copolymerlsatdispersio-

nen have a pH in the area of 4. By The addition of a small amount of aqueous ammonia increases the pH of the various dispersions to 7 adjusted, whereupon the dispersions are used in the examples below.

Manufacturing process 2

(Preparation of the comparative compound (5), i.e. a butadlene / styrene / itaconic acid copolymer in the form an aqueous dispersion)

In a stirred autoclave flushed with nitrogen, the Starting materials introduced. The emulsion polymerization is carried out at a polymerization temperature of 50 ° C initiated. The polymerization pressure (due to the introduction of butadiene) is 1.013 bar. The polymerization is carried out for 5 hours, an aqueous copolymer dispersion being obtained.

deaerated distilled water 50 ml Sodium dodecylbenzenesulfonate 0.25 g Ammonium persulfate 0.200 g Butadiene 10 g Styrene 15 g Itaconic acid ig

One with a stirrer, reflux condenser, temperature control heater, thermometer and a dropping funnel, 500 ml four-necked flask is filled with 200 ml of deaerated distilled Water and sodium dodecylbenzenesulfonate are charged as emulsifying dispersants, whereupon the contents of the flask is stirred at a stirring speed of 250 rpm. The temperature inside the flask is controlled in such a way that it remains at 80 ° C. Well will the contents of the flask with stirring with 0.15 g of ammonium persulfate as a polymerization initiator and 0.15 g Sodium hydrogen sulfite as a polymerization promoter

5i In the dispersion obtained, the solids concentration is 32% by weight and the degree of polymerization is 95% the particle size of the particulate interpolymer

sats 0.11 μΐη. The dispersion has immediately after their preparation has a pH of 2.1. By adjusting the pH with a small amount of ln-aqueous Ammonia on 7 is obtained as a sizing solution which can be used in the examples below. the

After the pH has been adjusted, the dispersion has a surface tension of 48 dynes / cm.

Aqueous copolymer coating solutions which can be used according to the invention can plasticizing agents

let, ζ. B. Dlbutylphthalat or Dloctylphthalat, DIkkungsmlttel, such as polyvinyl alcohol, carboxymethyl cellulose, sodium salts of vinyl acetate / malelic acid mixed polymers or gelatin, various antistatic agents, various dyes and pigments, natural surfactants and inorganic or organic anti-caking agents, e.g. B. silicon oxide, Contain titanium oxide, starch, polymethyl methacrylate or polystyrene. You can also, if necessary Water-miscible solvents for better drying, e.g. B. methanol, ethanol or acetone, the polyester neither swell nor dissolve, are added. Furthermore, the mlschpolymerlsathaltlgen can be aqueous Beschlchtungslösungen according to the invention adhesion promoters, for. B. Compounds with Äthylenimlngruppen, Trlazine compounds or compounds with methylsulfonyloxy groups, included, but they deliver excellent even without the addition of adhesion promoters Results.

A mlschpolymerisathaltlge aqueous coating solution according to the invention used to produce an adhesive layer is used in conventionally known catfish, e.g. B. by dip, double roller, air knife, pillow roller, gravure roller or reversal coating, per m ² of support surface of the support in an amount of 10 to 40 g on a polyester support for light-sensitive photographic recording materials and applied by heating to a temperature of 60 ° to 150 ⁰ C dried. The drying takes place in the usual known catfish by means of hot air or infrared radiation.

The polyester backing provided with an adhesive layer by superficial application and drying of the aqueous coating solution containing the copolymer according to the invention can further be coated with an aqueous coating solution containing a hydrophilic polymer or an aqueous gelatin coating solution to form a second adhesive layer and then dried. The polyester layer support provided with the adhesive layer can optionally be subjected to an aftertreatment, e.g. 3. a heat treatment at 100 ° to be 15O ⁰ C, subjected. A polyester substrate with the mixed polymer adhesive layer as the first adhesive layer can be provided directly with a photographic emulsion layer without a second adhesive layer being applied to the first adhesive layer. Furthermore, the surface of the polyester substrate can be subjected to a surface modification treatment by means of corona discharge before the formation of a second adhesive layer on the first adhesive layer formed on the polyester substrate by applying a polymer-containing aqueous coating solution according to the invention, or prior to the application of a photographic emulsion directly to the first adhesive layer (cf. JA-OS 3 972/1974 and 22 735/1978). As a result of this treatment, the adhesive properties of the polyester layer support treated in this way with respect to the second adhesive layer or the photographic emulsion layer can both be further improved and also stabilized.

To prevent block formation and electrostatic charging as well as to improve other physical properties, a wide variety of additives, e.g. B. Compounds with Äthylenimlngruppen, compounds with Methyisuifonyignippen or compounds such as triacroyl-s-triazine, particulate materials such as titanium oxide, silicon oxide, PoiyiTiethylmethacrylat, polystyrene, starch, and various types of water-soluble or dispersible high molecular weight substances are incorporated.
Furthermore, they can also contain additives capable of crosslinking the epoxy groups of glycidyl acrylic and / or glycidyl methacrylate, which is (are) a component of the copolymer contained in the first adhesion-promoting layer, for example amine derivatives such as hexamethoxymethyl melamine, amine condensates such as melamine or urea Aldehydes, and organic acids at least bifunctional in nature, e.g. B. Itaeonic, maleic, Trlmellit- or pyromellitic acid, and catalysts, ι. B. p-toluenesulfonic acid, ammonium chloride, ammonium nitrate and the like to promote crosslinking.

The following examples are intended to illustrate the invention in more detail.

Example I.

The surface of a biaxial to a thickness of 180 um stretched polyethylene terephthalate carrier is subjected to a modification treatment with the aid of a commercially available corona discharge station. This takes place at normal pressure under discharge conditions, under which the substrate is at a conveying speed is moved by 15m / mln. The electrode spacing is 1.5 mm. The electrical power is 200 W. The current is 0.7 A. When it comes into contact with water, the surface of the In has In the manner described, polyethylene terephthalate carrier had a contact angle of 45 ° C. Thereafter the compounds (1), (2), (3) and (5) are diluted with water in such a way that solids concentrations of 5 % By weight can be achieved. Finally, the polymer-containing aqueous coating solution obtained in each case is used incorporated 0.4 g of saponin per kg.

The aqueous coating solution obtained in each case containing copolymerizate is applied to the surface of a corona-treated polyethylene terephthalate substrate to form an adhesive layer by double roller coating in such a way that ^{20 g per m 2 of} substrate area are used. The whole is then dried for 3 minutes by means of hot air at 120 ° C.

Further, a coating solution for forming an adhesive layer is prepared by adding 1 kg of an aqueous solution of 10 g of gelatin to 0.3 g of saponin. The coating solution obtained is applied by double roller coating to the adhesive layer containing the copolymer as a second adhesive layer in such a way that 20 g are used ^{per m 2 of carrier surface.} Finally, the whole thing is dried with hot air at 100 ° C. for 3 minutes. Finally, the second adhesive layer is dried for a further 1 minute using hot air at 140 ° C.

The various polyethylene terephthalate supports provided with an adhesive layer are used for manufacture of test pieces I to 4 coated with a silver iodobromide-containing photographic X-ray emulsion. In Comparative test specimens 5 to 7 with the comparative compounds (2), (4) and (5) are produced in a corresponding manner.

The test specimens and comparison test specimens are tested according to the following rules (A) and (B) on their Adhesion strength, according to the following rule (C) on the edge peeling and according to the following Regulation (D) on the transparency of the polyester layer carrier provided with the adhesion-promoting double layer examined. The results can be found in Table II below.

(A) Dry keeping tesi:

Before development, as well as after development and after drying, the surface of the silver halide emulsion layer becomes Each test specimen or comparison test is subjected to a customary cross-sectional adhesion test. With the help of a sharp blade, z. B. a razor blade, the surface to the substrate incised, whereupon an adhesive tape, e.g. B. a cellophane tape, is applied. The tape stuck in this way is finally suddenly peeled off the surface. The review takes place according to the following scale: It is not peeled off from the emulsion layer: AA; 1 to 5% of the emulsion layer is (are) deducted: A; 6 to 30 '\. the emulsion layer are peeled off: B; 31 to 100% of the Emulsion layers are peeled off: C.

(B) Wet adhesion test during development: the emulsion layer rubbed off: AA; 1 to 10% lct rubbed emulsion layer comes off (peeled off): A; 11 to 30 ¹ Yi of the emulsion layer can be rubbed off: B; Above 30 ¹ K. of the emulsion layer are rubbed off: C.

(C) Edge detachment during development:

During treatment with a developing and fixing agent, each test piece becomes wet firmly with a finger or whatever rubber in the horizontal direction from an edge of the photosensitive Rubbed a layer of the specimen toward you inside to see if the edge of the probes Layer detaches from the substrate or not. The results are evaluated according to the following Scheme: The edge loosens, even if only slightly, from: bad; the edge does not peel off at all: good.

(D) Evaluation of the transparency of the with a double Polyester backing provided with an adhesive layer:

During development, the surface of the SiI overhalogen emulsion layer becomes each test specimen is subjected to a customary cross-cut or cross-cut test in the wet state. Here, the emulsion layer surface is applied a drill-like pointed metal rod in the same way as in the dry adhesion test used. The incised surface is then rubbed to see if the surface is broken Rubbing peeled off the substrate or not. The evaluation is carried out according to the following scheme: It is not from Each polyester layer carrier on which the mischpoiymerlsathalllge Adhesive layer has been formed is visually observed. No turbidity is considered "good," one if even only minor ones. Turbidity already described as "bad".

From a practical point of view, those examinees who in tests (A) and (B) received the rating B or above and in tests (C) and (D) the evaluation "Well" preserved, considered useful.

Table Il

link

Test specimen adhesion in edge diameter

No dry wet peeling off sight

Condition condition

(1) 1 that can be used according to the invention

(2) 2 which can be used according to the invention

(3) 3 which can be used according to the invention

(5) 4 which can be used according to the invention

Comparison compound (2) 5

Comparison compound (4) 6

Comparison compound (5) 7

B. AA gur Well A. AA Well Well A. AA Well Well B. AA Well Well C. AA Well Well A. AA Well bad A. C. bad Well

From Table II it can be seen that the invention with the aid of an aqueous copolymer containing Coating solution of the required composition, recording materials obtained excellent Adhesion of the photographic layer to the support provided with a subbing layer is excellent Resistance to edge peeling and excellent transparency of the copolymers Show adhesive layer. In contrast, a polyethylene terephthalate substrate suffers with With the aid of an aqueous coating solution containing the comparative copolymer, an adhesion promoting treatment was subjected to poor adhesion of the photographic layer to the support, Resistance to edge peeling and transparency of the adhesive layer containing copolymers.

Example 2

A Polyäthylenterephthalatschichtträger a thickness of 100 to obtain the hydrophilizing treatment described in Example. 1

Furthermore, the compounds (2), (3), (4) and (6) are individually diluted with water so that a solid content of 5 wt .-% is achieved. Thereafter, each of the dilute copolymer containing aqueous Coating solutions according to the invention incorporated per kg of 0.4 g of saponin.

Each coating solution obtained is divided into two parts, one per 1 kg with 1.5 g of des Adhesion promoter Hexamethylenbisäthyleniminoureid is added and the other experiences no addition.

The resulting aqueous copolymers

15th

Coating solutions are used individually for the formation of adhesive layers Ui of those described in Example 1 Way (a) immediately after their preparation or (b) after standing for 12 hours at a temperature of 35 ° C. on the polyethylene terephthalate support which has been subjected to a hydrophilization treatment in the manner described applied.

Furthermore, a second coating solution for forming an adhesive layer is prepared by adding 1 kg of an aqueous solution of 5 g of gelatin to 0.2 g of saponin. To form a second adhesive layer, the coating liquid obtained is applied to the copolymer-containing adhesive layer by double roller coating in such a way that 20 g are used ^{per m 2 of carrier surface.} Finally, the whole is dried with hot air at 100 ° C. for 2 minutes.

The adhesion mediation treatment in the manner described Subjected polyethylene terephthalate supports are individually coated on their surface a lithographic one containing silver chlorobromide Silver halide emulsion; d. H. a silver halide emulsion, which with the help of a so-called Uth developer is developed, coated, whereby Samples 8 to 23 are obtained.

Using the comparison compounds (2), ίο (4) and (5) are in a manner corresponding to that test specimens according to the invention comparative tests 24 to produced. The properties of the invention Test specimens and comparative test specimens are listed in Table ΙΠ listed.

Table III

Liability brackets used, use of mixed polymers

Link . Coating solution after its preparation

Immediately after leaving the preparation to stand for 12 hours (AWAY)

according to the invention insertable connection (2) according to the invention insertable connection (2)

according to the invention insertable connection (3)

according to the invention insertable connection (3)

according to the invention insertable connection (4)

according to the invention insertable connection (4)

according to the invention insertable connection (6) according to the invention insertable connection (6) Comparison compound (2) Comparison connection (2X Comparison compound (4) Comparison compound (4) Comparison connection (5) Comparison compound (5)

not added added not added added not added added not added added

not added added not added added not added added Test item no.8 Test item no.10 Test item no.12 Pruning No. 14 Pruning No. 16 Pruning No. 18 Pruning No. 20 Pruning No. 22

Pruning No. 24 Pruning No. 26 Pruning No. 28 Pricing No. 30 Pruning No. 32 Pruning No. 34

PrOHing No. 9 Pruning No. 11 Pruning No. 13 Pruning No. 15 Pruning No. 17 Pruning No. 19 Pruning No. 21 Pruning No. 23

Pruning No. 25 Pruning No. 27 Pruning No. 29 Pruning No. 31 Pruning No. 33 Pruning No. 35

The test specimens according to the invention and VefglelchsprOninge according to Example 1 are then a port ! Ungstest, a test regarding the detachment of the canteen and subjected to a test for their transparency. The results obtained in this way can be found in Table IV below.

308 130/222

17th Table IV 29 46 204 VO OO 18th AA
AA edge
replacement Look through
activity of
the
Adhesive layer connection used liability
sponsor 10
11 AA
AA Well
Well Well
Well not added according to the invention
insertable connection (2) 12th
13th liability
in in
dry wet
Condition condition AA
AA Well
Well Well
Well added according to the invention
insertable connection (2) Use test item
dermisch-poly- no.
merisat-containing
Coating
solution according to your
preparation 14th
15th CO CO AA
AA Well
Well Well
Well not added according to the invention
insertable connection (3) (A) (cf.
Tab. III)
(B) (cf.
Tab. III) 16
17th A.
B. AA
AA Well
Well Well
Well added according to the invention
insertable connection (3) (A)
(B) 18th
19th A.
A. AA
AA Well
Well Well
Well not added according to the invention
insertable connection (4) (A)
(B) 20th
21 A.
A. AA
AA £ ut
Well Well
Well added according to the invention
insertable connection (4) (A)
(B) 22nd
23 A.
A. AA
AA Well
Well Well
Well not added according to the invention
insertable connection (6) (A)
(B) 24
25th A.
A. AA
AA Well
Well Well
Well added according to the invention
insertable connection (6) (A)
(B) 26th
27 CO CO AA
AA Well
Well Well
Well Comparative compound (2) not added (A)
(B) 28
29 A.
B. AA
AA Well
Well Well
Well Comparison compound (2) added (A)
(B) 30th
31 C.
C. AA
AA Well
Well bad
bad Comparison compound (4) not added (A)
(B) Ul ul
Ul SJ A.
C. C.
C. Well
Well bad
bad Comparison compound (4) added (A)
(B) 34
35 A.
A. A.
C. bad
bad Well
Well Comparison compound (5) not added (A)
(B) A.
A. Example 3 bad
bad Well
Well Comparison compound (5) added (A)
(B) A.
A. (A)
(B) A.
A. (A)
(B) From Table IV it can be seen that according to the invention

Polyethylene terephthalate substrate subjected to an adhesion promoter treatment by application of an aqueous solution containing a copolymer, even without the use of an adhesion promoter! photographic layer on the support without edge detachment and excellent transparency of the interpolymer adhesive layer. On the other hand, the adhesion in the comparative test pieces containing the comparative compounds (2) and (5) becomes worse if the mixed polymer coating solutions are applied after standing for 12 hours, although the adhesion as such can be improved by using the adhesion promoter as well. These However, comparative test specimens cannot be used in practice. Those containing the comparative compound (5) Comparative test specimens suffer from edge peeling. The comparative test specimens containing the comparative compound (4) are not acceptable because the Mischpoiymerisathaftschicht is cloudy.

According to Example 1, a polyethylene terephthalate support is used a thickness of 100 µm subjected to a hydrophilization treatment.

The compounds (2) and (3) are diluted with water in such a way that a solids concentration of 5% by weight ¹ V is achieved. Each of the dilute copolymer-containing aqueous coating solutions is incorporated per kg of 0.4 g of saponin, whereupon the respective coating solution is divided into two parts. One of these parts is according to Example 2 per kg 1.5 g of the

fco adhesion promoter llexamelhylenbisäthyleniminoureid incorporated, the other receives no addition.

Those prepared in the manner described, containing copolymers Aqueous coating solutions are used accordingly for the formation of adhesive layers

^B ä Example 1 is applied to the surface of the hydrophilization-treated polyethylene terephthalate support and dried.
Furthermore, another one for the formation of a detention

layer-suitable coating solution prepared by adding 1 kg of an aqueous solution of 5 g of gelatin to 0.2 g of saponin. To form a second adhesive layer, the resulting coating solution is applied to the adhesive-promoting layer containing the copolymer by means of double roller coating in such a way that 20 g are used ^{per m 2 of carrier surface.} The whole is then dried for 2 minutes using hot air at 100 ° C. In order to determine an impairment of the adhesion properties of the polyethylene terephthalate layer carrier, which has been subjected to an adhesion promoting treatment in the manner described, in the course of time, the

20th

Lay the substrate for 2 weeks at a temperature of 50 ° C and a relative humidity of 80% calmly. The polyethylene terephthalate substrates treated in this way and provided with a double adhesive layer are finally used to manufacture test objects up to 43 on their surface with a silver chlorobromide containing lithographic emulsion coated.

Using the comparative compounds (3) and (5), comparative test-

manufactured to items 44 to 51. The items according to the invention and comparative test specimens are identified in Table V below.

Table V

Adhesion promoter used Use of the substrate of the adhesion promoter treatment

Connection immediately after leaving a for 2 weeks

the treatment (A) temperature of 50 ° C and one

relative humidity of 80% (B)

according to the invention
insertable connection (2)
according to the invention
insertable connection (2)
according to the invention
insertable connection (3)
according to the invention
insertable connection (3)
Comparison connection '3)
Comparison connection (3)
Comparison compound (5)
Comparison compound (5)

not added
added
not added
added

not added
f.ageseUl
not added
added

Test item no.36 Test item no.38 Test item no.40 Test item no.42

DUT No. 44 Pruning No. 46 DUT No. 48 Pruning No. 56

Test item no.37
Test item no.39
Test item no.41
Test item no.43

Pruning No. 45
Pruning No. 47
Pruning No. 49
Pruning No. 51

The test specimens according to the invention are then subjected to a test with regard to their transparency.

Comparative jumps according to Example 1 in a port 40 The results obtained in this way are in the following

tung test, an edge peel test, and Table VI below.

Table VI

connection used Liability
sponsor storage
under the
given
conditions Test item
No. liability
in
dry
State in
wet
State edge
replacement according to the invention
insertable connection (2) not added (A) (cf.
Tab. V) 36 A. AA Well according to the invention
insertable connection (2) not added (B) (cf.
Tab. V) 37 A. AA Well according to the invention
insertable connection (2) added (A) 38 A. AA Well according to the invention
insertable connection (2) added (B) 39 A. B. Well according to the invention
insertable connection (3) not added (A) 40 A. AA Well according to the invention
insertable connection (3) not added (B) 41 A. AA Well according to the invention
insertable connection (3) added (A) 42 A. AA Well according to the invention
insertable connection (3) added (B) 43 A. B. Well

continuation

connection used Liability storage Test item liability in edge sponsor under the No. in wet replacement given dry State conditions State

Comparison compound (3)
Comparison compound (3)
Comparison compound (3)
Comparison compound (3)
Comparison compound (5)
Comparison compound (5)
Comparison connection (5)
Comparison compound (5)

not added
not added
added
added
not added
not added
added
added

44
45
46
47
48
49
50
51

C.
C.
B.
C.
A.
A.
A.
A.

AA Well AA Well AA Well B. Well C. bad C. bad A. bad C. bad

From Table VI it can be seen that the invention. an adhesion mediation treatment by application the polyethylene terephthalate substrate subjected to the copolymer containing aqueous coating solution excellent photographic adhesion regardless of the use of an adhesion promoter Have layer on the substrate. In addition, they experience little change in liability in the In the course of time when an adhesion promoter is omitted from the aqueous coating solution containing the copolymer. On the other hand, they show comparative test pieces prepared using comparative compound (3) poor wet adhesion of the photographic layer prepared using Comparative Compound (5) Comparative samples exhibited both poor wet adhesion and edge peel.

Example 4

According to Example 1, a polyethylene terephthalate support is used a strake of 100 μm subjected to a hydrophilization treatment.

Furthermore, the compounds (2), (3) and (6) are diluted with water in such a way that solids contents of 5% by weight can be achieved. Each of the dilute copolymer-containing aqueous coating solutions is per kg 0.4 g of saponin incorporated, whereupon the various copolymer-containing aqueous coating solutions according to Example I individually on the surface of the hydrophilized treatment Polyätbylenterephthalatschichttnjers applied and -be dried. The surface of the polyethylene terephthalate carrier provided with the mixed polymer adhesive layer is then applied under normal pressure with

Table VII

Modified using a commercially available corona discharge device. The discharge conditions are as follows: Migration speed of the substrate: 10 m / in; Electrode gap: 1.5 mm; electrical power: 200 W; Current: 0.7 A.

Furthermore, another liquid suitable for forming an adhesive layer is prepared by adding 1 kg of an aqueous solution of 10 g of gelatin to 0.3 g of saponin. To form a second adhesive layer, the coating liquid obtained is applied to the first adhesive layer, which has been pretreated by corona discharge, by means of double roller coating, in such a way that ^{20 g per m 2 of support surface are used.} The whole is then dried with hot air at 100 ° C. for 1 min.

The layer support provided with the second adhesive layer in the manner described is finally corn again Heat-treated for 1 min with hot air at 140 ° C.

The adhesion mediation treatment in the manner described Subjected polyethylene terephthalate supports are used for the production of test specimens 52 to 54 individually on their surface with a gelatin coating solution (to form backing layers) coated for gravure films. Using the comparative compounds (1), (4) and (5) are under Otherwise, under the same conditions, comparative test specimens 55 to 57 were produced.

The test specimens according to the invention and comparison test specimens are then subjected to an adhesion test in accordance with Example 1, subjected to an edge peeling test and a transparency test. The results obtained in this way can be found in Table VII below.

connection used Test item
No. liability
in ^ rocKenem
State in wet
State edge
replacement By
sight according to the invention
insertable connection (2) 52 A. AA Well Well according to the invention
insertable connection (3) 53 A. AA Well Well according to the invention
insertable connection (6) 54 Λ AA Well Well Comparison compound (1) 55 C. AA Well Well Comparison connection (4) 56 A. AA Well bad Comparison compound (5) 57 A. C. bad Well

From Table VII it can be seen that the degree of relief by applying an aqueous coating liquid containing copolymer to an adhesion reducing treatment subjected to polyethylene terephihalal supports in contrast to the aqueous ones contained using a comparison compound Coating solution of a ventilation mediation treatment Subjected polyethylene terephthalate layer supports excellent adhesion of the gelatin backing layer, excellent edge detachment resistance of the gelatin backing and excellent transparency of the mixed polymer adhesive layer.

Example 5

According to Example I, a biaxially stretched polyethylene terephthalate layer support is used with a thickness of 180 µm subjected to a hydrophilic treatment.

The compounds (2) and (3) are individually diluted with water according to Example ί, whereupon the obtained dilute solution for the preparation of a copolymer containing aqueous coating solution according to of the invention per 1 kg with 0.2 g of an alkylarylpolyäthcrsulfai-Netzmiuels the formula:

C ₉ H ₁ ^ n)

(n) C, H,

is moved.

0 (CH ₂ CH ₂ O) ₁₂ SOjNa

The coating solutions obtained containing polymerizate are according to Example 1 to form an adhesive layer on the surface of the Polyethylene terephthalate substrate subjected to hydrophilization treatment applied and dried. Thereafter, the surface of the mil the mixed polymer adhesive layer Polyäthylcnterphthalatschichlträgers provided according to Example I under normal pressure by means of a commercially available corona discharge device subjected to a modification treatment. the Discharge conditions are as follows: Migration speed of the layer support: 10 m / min; Electrode distance: 1.5mm; electrical power: 200 W; Current: 0.7 A.

To produce test objects 58 and 59 according to the invention, a modification treatment is applied to the surface in each case subjected mixed polymer adhesive layers to an X-ray photographic silver halide emulsion applied.

Using the comparative conditions (1), (2) Λ) and (5), under otherwise identical conditions, comparative test subjects 60 to 62 manufactured.

After that, the test specimens according to the invention and Comparative test specimens according to Example 1, an adhesion test, a test for edge detachment and subjected to a test for their transparency. The results obtained are shown in the following Table VIII.

Table VIII

connection used Prüliing liability in Edge- By Ni. in wet replacement sight dry State State A. according to the invention 58 A. gul Well insertable connection (2) A. according to the invention 59 A. Well Well insertable connection (3) A. Comparison compound (1) 60 C. A. Well Well Comparison compound (4) 61 C. D. gul bad Comparison compound (5) 62 B. bad Well

From Table VIII it can be seen that the interpolymer adhesive layer even with a single-layer construction, i.e. H. without a second adhesive layer, adheres excellently to the photographic layer, good resistance to Shows edge delamination and is of excellent transparency.

Example 6

The surface of a biaxially oriented polyethylene terephthalate support of a thickness of 100 μηι is at a temperature of 25 ° C and a relative Humidity of 55% for 15 minutes from a distance of 2 cm using a 400 W low pressure mercury lamp irradiated at a main wavelength of 2537 Å. The surface of the in the manner described treated polyethylene terephthalate support shows a contact angle of 55 ° on contact with water.

The compounds (1), (2), (3) and (4) are diluted in such a way that solids concentrations of 10% by weight are achieved. The aqueous coating solutions prepared in the manner described, containing copolymers, are then applied to the surface of the polyethylene terephthalate substrate previously subjected to a hydrophilic treatment to form a first adhesive layer on the substrate surface using an air knife in such a way that ^{15 g per m 2 of} substrate surface are used. The whole is then dried with hot air at 120 ° C. for 3 minutes.
Further, a further formation of a subbing layer suitable coating liquid is prepared by adding 0.3 g of saponin to 1 kg of an aqueous solution of 10 g of gelatin. To form a second adhesive layer, the latter coating solution is applied to the first adhesion-promoting layer by means of an air knife in such a way that 20 g are used ^{per m 2 of carrier surface.} Then the whole thing is dried in hot air at 100 ° C for 2 minutes.
On the surface of an adhesion promoter

Polyethylene terephthalic acid carrier subjected to action. which had been subjected to a heat treatment with air at 140 "C for a further minute a photographic emulsion containing silver chlorobromide for the production of samples 63 to 66 according to the invention applied.

Using the comparative compounds (3). (4) and (5) under otherwise identical conditions VeiBieichprüfliiige 67 to 69 produced. Another Comparative test specimen 70 is made using the comparative compound (6), which is a copolymer of the following components (see JA-OS 22 735/1978):

10

Ethyl acrylic 36 mol%

Methyl methacrylal 29 MoM,

Glycidyl methacrylate 8 mol- ¹ V

Hydroxyethyl methacrylate 2 mol%

Acrylonitrile 25 moles - '\.

handeil, made.

The test specimens according to the invention and comparison test specimens are then subjected to an adhesion test according to Example I, a test for edge detachment and a test for their transparency. The results obtained in this way can be found in Table IX below.

Table IX

connection used Test item liability in edge By No. in wet replacement sight dry State State

according to the invention
insertable connection (1)

according to the invention
insertable connection (2)
according to the invention
insertable connection (3)

according to the invention
insertable connection (4)

Comparison compound (3)
Comparison compound (4)
Comparison compound (5)
Comparison compound (6)

63 B. AA Well Well 64 A. AA Well Well 65 A. AA Well Well 66 B. AA Well Well 67 C. AA Well Well 68 A. AA Well bad 69 A. C. bad Well 70 C. C. bad Well

From Table IX it can be seen that, in comparison with the aqueous coating solutions containing the comparative copolymers and subjected to an adhesion promoting treatment, the polyethylene terephthalate carriers subjected according to the invention to an adhesion promoting treatment show excellent film adhesion, resistance to edge peeling and transparency of the adhesion promoting mixed polymer.

Claims (1)

The invention relates to a coating solution, used to form an adhesive layer on a polyester substrate, with a copolymer containing glycidyl acrylate and / or glycidyl methacrylate units, and a polyester substrate containing such an adhesive layer. The adhesive layer serves to ensure a firm adhesion between a photographic coating material to be applied to the layer support, e.g. B. a gelatlnehaltigen photographic coating material. such as a gelatine silver halide emulsion, one an anti-lighthound with 25 patent claims: 1. Coating solution containing a copolymer with glycidyl acrylate and / or glycidyl methacrylate units contains, characterized in that the copolymer is made up of the following percentages Units composed:., a) 35 to 55% by weight of glycidyl acrylate and / or glycidyl methacrylate b) 20 to 55% by weight of n-butyl acrylate c) 10 to 30% by weight of styrene and / or γ-methylstyrene.