LT3331B - Process for package coating, method of manufacturing coating composition and aplication thereof - Google Patents

Abstract

The present invention relates to coating compounds comprising hydroxyl-group-containing, possibly modified, polyester and/or hydroxyl-group-containing epoxy resin and/or hydroxyl-group-containing acrylate copolymer and a wetting agent which is reactive to hydroxyl groups and a lubricant, in which the lubricant is a wax paste D which contains: d1?) 3 to 30 % wt. of one or more polyolefine and/or substituted polyolefine waxes, d2?) 0 to 25 % wt. of one or more melamine formaldehyde resins, d3?) 5 to 40 % wt. of one or more acrylate resins with an OH number of 10 to 150 mgKOH/g and a mean molecular weight of 2000 to 7000, and d4?) 10 to 80 % wt. of one or more organic solvents, where the sum of the percentage weights of components d1? to d4? is 100 % wt. The invention also relates to the process for making this coating compound and to its use, especially for painting the outside of deep-drawn cans.

Description

The present invention relates to a coating composition for a packing container, to a process for its preparation and to its application to the outer coating of cans, partially obtained by a high tensile strength.

Dishes, such as boxes, tubes, buckets, canisters, etc., often referred to as tare, are usually coated externally with a varnish that primarily serves as a decorative design for the tare. Therefore, obtaining a quality surface in an easy-to-carry manner is a basic requirement for appropriate coating compositions. However, this outer surface must withstand extreme stresses (rolling, bending, deformation, sterilization, etc.) when making containers.

The outer coating of the container shall, as a rule, be a multilayer coating consisting of a layer of priming varnish as a backing layer, a printing ink and, if necessary, a colorless protective varnish called silver lacquer. Particularly high requirements are applied to priming varnishes when colorless protective varnish is not used as the outer finishing coat. These primers are also known as unprotected exterior varnishes.

Unprotected exterior varnishes must be particularly durable for subsequent decoration, ie. y. they must be suitable for pattern printing, have good adhesion and dyeing. The resulting coatings must be highly glossy, i. y. have a gloss factor (reflection angles of 60 °) greater than 80, high abrasion resistance, as well as a smooth surface structure, i.e., free of crater-like defects, etc.

Similar unprotected exterior varnishes are known (cf., e.g., Ullmann Encyclopedia of Technical Chemistry, Fourth Edition, 1978, Vol. 15, pp. 713-714). These varnishes are based on modified acrylic resins, epoxy polyester resins, polyester and polyacrylic resins. It is common for these unprotected exterior varnishes to incorporate a technological additive that improves the slipperiness of plastics to purposefully influence the strength of the finish coat and achieve optimum surface resistance to abrasion, while maintaining good shine and high resistance to subsequent decor. Waxes and volatile waxes such as lanolin or beeswax are used in this technological additive to improve glide.

However, there are problems when these unprotected exterior varnishes are used to cover boxes made with high tensile strength where the top of the boxes is strongly deformed. In such extreme deformation it is necessary to ensure that the lacquer layer is not damaged, this can only be achieved with the help of a coating with elastic lacquer film. On the other hand, a guarantee is required that the resulting coating will withstand extreme mechanical loads during the manufacture of the boxes as well as during their filling. This means that the resulting lacquer film must be highly abrasion resistant and accordingly tough, partially sclerometric hard, which also requires a special technological additive that can specifically regulate the hardness of the surface lacquer coating. Technological additives that ensure hardness are eg. polyethylene, polypropylene or polytetrafluoroethylene waxes. These waxes, however, tend to give turbidity and are therefore unsuitable for sheet lacquers, as box manufacturers require glossy surfaces.

Therefore, for the purpose of the present invention there is a coating offset which, as an unprotected exterior varnish, is suitable for covering boxes made with high tensile strength. The resulting coatings must have a smooth surface, high gloss, good coloring, abrasion resistance and sufficient hardness, while maintaining a highly elastic film. In addition, such cover offsets must be stable in storage, i.e. for a period of 3 months or more, the lacquer films obtained from them shall meet the above optical and mechanical properties.

The object is achieved by a composition comprising a hydroxy group-containing polyester, optionally modified, and / or an epoxy resin having a hydroxyl group and / or an acrylic acrylic copolymer having a hydroxyl group as well as a hydroxy-reactive crosslinking agent and technological additive. a technological additive to improve glide is a wax paste D containing d _t ) from 3 to 30% by weight of one or more polyolefinic and / or substituted olefin waxes, d ₂ ) 0 to 25% by weight of one or more melamine formaldehyde resins, d ₃ ) 5- 40% by weight of one or more acrylic resins having an OH number of 10 to 150 mg KOH / g and an average weight of 2000 to 7000, and d ₄ ) 10 to 80% by weight of one or more organic solvents and the sum of the components d _r to d ₄ by weight, in each case 100% by weight.

The present invention also relates to a process for the preparation of compositions, as well as to their use for tare coating, in part for exterior coating of cans with high tensile strength.

The compositions of the present invention form a lacquer film with a high gloss coefficient, a smooth surface structure, good decorating properties and good abrasion resistance, while having a high elasticity of the resulting lacquer films, and the complex retains these properties for 14 days or longer.

In the manufacturing process, it is recommended to use the wax dispersion in the box coating composition as a technological additive to improve glide. However, the coating compositions to which these wax dispersions are added according to the recommendation have a major disadvantage as these compositions are matte and unstable when stored. Already after 14 days of storage, the coating compositions form films with reduced gloss compared to films obtained from the freshly prepared composition. In addition, these films no longer have a smooth surface structure and also exhibit a high degree of crater-like surface defects.

The individual components of the composition of the invention are explained in further detail below.

According to the invention, the compositions contain one or more polymers having hydroxyl groups as a binder. These polymers may, if necessary, also have other functional groups, e.g. carboxyl. These polymers (component A) comprise from 10 to 60% by weight of the total amount of all components (A to F) in the composition.

These hydroxyl-containing polymers are selected from hydroxyl-containing polyesters and / or hydroxyl-containing polyethers modified with acrylic, polyesters and / or hydroxyl groups. If necessary, they can be used in combination with epoxy resins and / or acrylic copolymers containing hydroxyl groups.

An essential factor when selecting the appropriate binder component is, first of all, that in combination with the appropriate stitching material (component B), coatings that are highly elastic, maintain mechanical loads, deform the coated boxes, film is not peeled and teared or otherwise damaged.

The hydroxy group-containing polyesters of Component A are prepared by conventional methods of esterification of aliphatic, cycloaliphatic, and aromatic di- and / or polyols. The resulting polyesters have a hydroxyl number of from 30 to 100 mg KOH / g, preferably between 40 and 80 mg KOH / g and an average molecular weight of between 3000 and 8000. Most commonly used are blends of 0 to 20 parts of an polyester having an OH number of 70 to 80 mg. KOl / g and 40-100 parts of polyester having an OH number of 50-100 mg KOi0j. For example, phthalic, isophthalic, terephthalic, hexahydro-phthalic, adipic, azelaic, sebacic, maleic, glutaric acids and long chain aliphatic and cycloaliphatic dicarboxylic acids such as so-called fatty acids may be used to obtain the polyesters of the corresponding carbonic acids. acid dimers. Conventional commercially available technical fatty acid dimers contain at least 80% by weight of fatty acid dimers, as well as up to 20% by weight of trimers and up to 1% by weight of the corresponding acid monomers. It is best to use isophthalic acid as the acidic component.

The alcohol component used in the production of polyesters is ethylene glycol, 1,2- and 1,3-propylene glycols, butanediol, pentanediol, neopentylglycol, hexanediol, 2-methylpentanediol-1,5,5-ethylbutanediol-1,4, dimethylolcyclohexane, glycerol, trimethylolpropane and trimethylol butane, pentaerythritol, dipentaerythritol, polycaprolactondiol and triol. Hexanediol-1,6, neopentylglycol and trimethylolpropane are preferred.

In addition, polyester modified with acrylic may be used in component A and, if desired, also in combination with the above polyesters and / or other binders. These acrylic-modified polyesters have an OH number between 50 and 100 mg KOH / g, preferably between 90 and 100 mg KOH / g, as well as an average molecular weight between 4000 and 6000. They can be obtained in various ways, e.g. by directly introducing the acrylate chain into the polyester. Thus, acrylic and / or methacrylic acid as well as hydroxyalkyl acrylates and methacrylates can be used instead of the acidic or alcoholic components in the polyester. Mostly acrylic-modified polyesters are obtained by acrylication of saturated and unsaturated polyesters. For example, the hydroxyl groups of the polyesters may initially be replaced by (meth) acrylic acid followed by polymerization in the presence of other unsaturated monomers. Thus, unsaturated polyesters of maleic and fumaric acids can be obtained by polymerization with acrylic monomers.

Further, the binder may be polyesters modified with epoxy having an OH number of 30 to 100 mg KOH / g, preferably 40 to 60 mg KOH / g.

Polyesters modified with epoxy are understood to be polyesters which already used epoxy resin as a polyol component at the time of preparation. Because epoxy resins have hydroxyl groups alongside the end epoxy groups, they can substitute part of the polyhydric alcohol for polyesters. In the modified epoxy polyester, the epoxy content is 50 to 90% by weight, preferably 70 to 90% by weight, based on the weight of the epoxy modified polyester. Examples include polyesters under the trade names DSN-URANOX®, Hoechst-ALFTALAT® and RESYDROL®, Jager (Düsseldorf) -JAGAHYD® and chemical plants Hutens-Albatus-HALWEPOX®.

Further, in the manufacture of the varnish, it is possible to blend the polyester with the epoxy resin and to undergo chemical conversion between these components in subsequent film firing. Practice has confirmed the expediency of using this mixture. The frequently observed inconsistency between polyester and epoxy resin can be improved by the addition of an amino resin. A mixture of polyester / epoxy resin with acrylic resin as a third component is also possible. In the mixture, the ratio of hydroxy group-containing polyester to epoxy resin is 0-20 parts epoxy resin per 100 parts polyester. Low and medium viscosity epoxy resins such as ShellChemie-Epikote® 1001, 824, 834 and 1004 are preferred for blends with polyester. Suitable acrylate copolymers according to the present invention have an OH number of 10 to 150 mg KOH / g and They may be obtained by polymerization on monomers having hydroxyl groups with the corresponding comonomers. Examples of monomers having hydroxyl groups are hydroxyalkyl esters of acrylic and methacrylic or other unsaturated acids, as well as the reaction product of acrylic and / or methacrylic acid with glycidyl compounds or hydroxyalkyl esters of unsaturated acids with ε-caprolactone. Examples of the best monomers and comonomers are given below.

The crosslinking agent (component B) in the composition of the invention may be one or more aminoplastic resins and / or one or more block di- or polyisocyanates. The stitching agent usually comprises 1-20% by weight of the components A to F.

Aminoplastic resins are understood to include, as a rule, etherified melanin-aldehyde and / or benzoguanamine-aidehyde products. Best use of appropriate formaldehyde products. The compatibility of the resins with other film-makers and solvents depends on the ether chain, length and degree of etherification. The main etherification components are n- and isobutanol.

Benzoguanamine-formaldehyde resins are preferred because they form more elastic films than melamine resins.

Block di- and polyisocyanates, such as aliphatic, cycloaliphatic, and aromatic di- and polyisocyanates, such as trimethylene, tetramethylene, pentamethylene, hexamethylene, hexamethoxy, trimethylene hexamethylene, are used in combination with aminoplastic resins or a single crosslinking agent. 6-diisocyanate and tri-hexamethylenetriisocyanate; 1,3-cyclopentane-, 1,4-cyclohexane, 1,2-cyclohexane- and isophorone diisocyanates as well as 2,4-, 2,6-toluene diisocyanates and their mixtures, 4,4'-diphenylmethane diisocyanate, m-Phenylene, p -phenylene, 4,4'-diphenyl, 1,5-naphthalene, 1,4-naphthalene, 4,4'-toluidine, xylylenediisocyanates, as well as named aromatic systems such as dianisidinedisisocyanates, 4 , 4'-diphenylether diisocyanates or chlordiphenylenediisocyanates and multifunctional aromatic isocyanates such as 1,3,5-triisocyanatobenzene, 4,4 ', 4,4' '-triisocyanatriphenylmethane, 2,4,6-triisocyanatoluene and 4,4' -diphenyldimethylmethane2,2 ', 5,5'-tetraiisocyanate. Hexamethoxydisocyanate is preferred.

Substances suitable for the formation of blocks from isocyanates are, for example, butoxime and the malonic acid ester. The coating composition of the present invention further comprises one or more organic solvents, preferably in an amount of from 20 to 70% by weight, based on the sum of the weight of components A to F. In each case, the optimum amount of solvent will depend in part on the method of application (spraying, dipping, etc.) and may be determined by one of ordinary skill in the art on a test basis.

Suitable solvents include aliphatic, cycloaliphatic and aromatic hydrocarbons, esters, ethers, and ketones, e.g. ethylene glycol diethyl ether, diethylene glycol dimethyl ether, methyl ethyl ketone, methyl-n-amyl ketone, diethyl ketone, ethyl butyl ketone, diisopropyl ketone, diisobutyl ketone, acetyl acetate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, amyl acetate, methyl acetate, methyl glycol,

An important component of the composition according to the invention is a wax paste D which provides a slipper comprising (d!) 3-30% by weight, preferably 6-15% by weight, of one or more polyolefins and / or substituted polyolefin waxes, d ₂ ) 0-25% by weight. %, preferably 0-10% by weight, one or more melamine formaldehyde resins, d ₃ ) 5-40% by weight, preferably 5-30% by weight, one or more acrylic resins having an OH number of 10-150 mg KOH / g and an average molecular weight by weight of 2000 to 7000, and io d ₄ ) 10 to 80% by weight of one or more organic solvents, moreover the sum of the components d _T to d ₄ is 100% by weight.

Preference is given to polyethylene and / or polypropylene and / or polytetrafluoroethylene waxes, and particularly suitable polyethylene waxes.

Examples of suitable polyolefin waxes (component d _t ) are known commercially from Shamroek Chemicals SST3 and Polyfluo 190, as well as Floridienne Polymers Polyfluo 400 polytetrafluoroethylene waxes, as well as Lanko PE 1500 brand polyethylene waxes, hereinafter referred to as Lanco PP 13 polypropylene waxes. and CP 1481 8F waxes, as well as polyethylene and polytetrafluoroethylene waxes such as the commercially available Lanko products TF 1780 and TF 1778, Micro Pouders MP 76 and MP 611, and other waxes, e.g. Luba-Paint 447-A waxes.

The components d _T - d ₃ , from which the wax can be dispersed in an organic solvent (e.g. Shellsol® and / or Solvesso * types), are homogenized together with a portion of component d ₄ until a wax paste is formed. With the addition of other solvents, the viscosity of the paste is made such that it can be treated with blenders, ball mills, sand mills, etc.

Suitable acrylic resins for making wax pastes are low molecular weight resins (average molecular weight 2000 - 7000) which are well suited to wax and react with the crosslinking agent B on combustion. Their OH is between 10 and 150 mg KOH / g, preferably 20-120 mg KOH. / g. They are obtained by copolymerizing hydroxyl-containing monomers with other unsaturated ethylene compounds.

Hydroxyl-containing monomers may be hydroxyalkyl esters of acrylic and methacrylic acids, e.g. hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, hydroxyalkyl esters of croton, isocrotonic, itaconic, maleic and fumaric acids.

In place of the hydroxyalkyl esters of a, β-ethylenically unsaturated carboxylic acids, partial reaction products of acrylic acid and / or methacrylic acid with glycidyl ester containing a tertiary alpha-C atom or a glycidyl ester of a, β-ethylenically unsaturated carbonic acid with tertiary aliphatic carbonic acid may be used. The reaction products of 1 mol of hydroxyethyl acrylate and / or hydroxyethyl methacrylate with 2 mol of ε-caprolactone may also be partially used.

Other ethylene-unsaturated monomers include acrylic and methacrylic acid alkyl esters such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, tert-butyl acrylate, ethyl pentyl acrylate, 5-acrylate, 2-acrylate, 2-acrylate, , dodecyl acrylate, hexadecyl acrylate, octadecyl acrylate, octadecenyl acrylate and methacrylates, respectively. Other monomers may also find application if they do not render the copolymer unsuitable. Examples of such acrylic resins include known trade names: Synthopol Synthalat®, AkzoSetalux®, Hoechst-Synthacryl® and DSMUracron®.

Particularly suitable for component d _{2 is the} product Maprenal® MF 800 from Casella AG, an unplasticized melaminoformaldehyde resin etherified with isobutyl.

Examples of suitable solvents (component d ₄ ) include the solvents listed below. Their wax paste uses 10 to 80% by weight and in each case is selected in such a quantity that it is easy to process a wax paste, for example by means of a mill-blender.

The wax paste is added to the coating composition in an amount of 0.8 to 8.0% by weight of the total amount of components A to F. Increasing the concentration of the wax paste increases the slipperiness and scratch resistance of the coated surface, but at the same time degrades the decorative properties. Because the pigments in the coating composition act on the slip and wear resistance of the resulting coating, the amount of wax in the composition depends on the pigment. Thus, for example, wax paste in pigmented compositions generally comprises from 1.5 to 3% by weight of the total weight of the components, whereas in non-pigmented compositions the wax paste comprises from 3 to 6% by weight of the total weight of the components. The optimal determination of the wax paste content can be accomplished by a few routine experiments.

As mentioned above, coating compositions can be used as clear varnishes, glazes and coating varnishes. The amount of pigment in the compositions is from 0 to 35% by weight of the total weight of all components A-F. Pigments include organic and inorganic dyes such as titanium dioxide, various iron oxides and di-acrylides.

The coating compositions may also contain 0-1% by weight of the total sum of the AF weights of the components, other excipients such as bulking agents (e.g., macromolecular acrylates), wetting agents (e.g., macromolecular acrylates) and foaming agents. (e.g. silicone oil).

If necessary, additional fillers of 0-15 weight are added to the coating, such as talc, mica, kaolin, chalk, ground quartz, dolomite, ground barium sulphate, various silicas, silicates, organic fibers, etc.

compositions may be%, by weight, of fiberglass,

According to the invention, the composition is usually obtained by mixing the components. If the components are not in liquid form, they should be initially dissolved in the solvent and the resulting solution mixed with the remaining components.

The wax paste is added to the final component in the composition of the components while mixing so that it is added to the others without further observing that the temperature of the mixture is lower than the melting point of the wax to prevent, for example, recrystallization of the wax upon cooling. Pigment E is added by permeating it with the binder and then adding the remaining components. The wax paste D, as described above, is added as a final component.

According to the invention, the compositions are cured in a temperature range of 180-235 ° C (object temperature, Metall Peak Temperature) for 5-90 seconds. This composition is applied to the substrate by folding, greasing, dipping (dipping) with the help of a squeegee or brush, and the meadow is then cured into a firm adhesive coating. The compositions are most useful for exterior painting of sheet containers, partially, strongly stretched beverage cans obtained by high tensile strength. Coating and curing of the composition is carried out using conventional packaging container dyeing apparatus.

The amount of coating composition depends on the intended use. If the compositions are used for exterior painting of sheet containers, the film thickness of the cured film is 5-20 µm.

The substrate may be partially based on metal containers such as cans, buckets, canisters, tubes, jar lids and two-piece beverage cans made of various materials, such as aluminum, tin and various groups of iron alloys, where appropriate. , coated with a passive layer of nickel, chromium and zinc compounds. According to the invention, the compositions may, however, also be used for coating other substrates.

The resulting varnish layers have the advantage that they have a high degree of gloss, a smooth surface structure, good decorating properties and high wear resistance with high elasticity. In view of their practical application, their stability in storing compositions is of particular importance.

The invention is further illustrated by the following examples. All parts and percentages of the composition are by weight unless otherwise stated.

Obtaining a wax paste

1.4 parts of a 20% dispersion of polyethylene wax (CEREFAK 178 from CERA CHEMIE BV, 7400 AM DEVENTER, The Netherlands), 0.3 parts of a 72% solution of unplasticized etherified isobutyl melamine formaldehyde resin (trade name Maprenal® MF 800) Casella AG, Hoechst-Gruppe) in isobutanol and 0.5 parts of a low-molecular weight acrylic resin solution (9: 1 in 60% xylene / butyl acetate) (OH number 45 mg)

KOH / g from solid resin) is homogenized in a mill blender by cooling until a homogeneous paste is obtained.

Obtaining a wax paste

1.4 parts previously described in 20% dispersion of polyethylene wax (CERAFAK 178 CERA CHEMIE) and 0.5 parts acrylic resin solution (60% xylene / butyl acetate 9: 1) (OH number 45 mg KOH / g solid resin) ) homogenize to a wax paste by freezing and mixing.

3-10 Obtaining Wax Pastes

95.4 parts given in Table 1 are commercially available waxes, 200 parts Solvesso® 150, 120 parts 72% non-plasticized etherified isobutyl melamine formaldehyde resin (trade name Maprenal® MF 800 from Cacella AG / solution in isobutanol and 270 parts low molecular weight acrylic resin solution - nis xylene / butyl acetate 9: 1) (OH number 45 mg KOH / g solid resin) is refined by ball milling into a homogeneous wax paste.

table

Waxes for use in pastes

Pas- he Wax 3 SST 3, by Shamrock Chemicals Polytetrafluoroethylene wax 4 TF 1780 from Lanko (Bremen) Polytetrafluoroethylene / Polyethylene wax 5 TF 1778 by Lanko (Bremen) Polytetrafluoroethylene / Polyethylene wax 6th Polyflno 190, by Floridienne Polymers Polytetrafluoroethylene wax 7th Polyflno 400, by Floridienne Polymers Polytetrafluoroethylene wax 8th MP 26, Micro Powders Polytetrafluoroethylene / Polyethylene wax 9th MP 611, Micro Powders Polytetrafluoroethylene / Polyethylene Wax 10th PE 1500, Lanco (Bremen) Polyethylene wax

Obtaining a wax paste

95.4 parts of a polyethylene polytetrafluoroethylene wax mixture (brand name MP 26 Micro Powders) and

200 parts Solvesso® 150 is recycled in a ball mill to homogeneous dispersion wax.

Obtaining a wax paste

95.4 parts of a mixture of polyethylene polytetrafluoroethylene waxes (brand name MP 611 Micro Powders) and 200 parts of Solvesso® 150 in a ball mill are processed into a homogeneous dispersion wax.

An example

Rutil-type 27.0 parts of titanium dioxide and

28.5 parts by weight of acrylated polyester solution (polyester / acrylic resin 1: 1, acid number 45-50 mg KOH / g, OH number 80-100 mg KOH / g), converted to solid resin, solvent Solvesso® 150, butyl glycol) milled to particles of 7 to 10 gm thickness. Then, 3.2 parts of a solution (60% solid resin, 32% Solvesso® 150, 8% butyl glycol) saturated polyester isophthalic acid-based saturated acid dimer, hexanediol, neopentyl glycol and trimethylolpropane having an acid number of less than 10 mg KOH / g and OH of 76 mg KOH / g, 7.6 parts of a commercial solution of 75% epoxy resin buffered phenol A in xylene (epoxy equivalent weight 450 to 500), 6.5 parts 82 to 86% etherified benzoguanamine resin in n-butanol, 4.1 parts hexamethoxydisisocyanate treated with butoxime, 10 parts butyl glycol acetate and 3.2 parts butyl glycol. To this mixture was added 2.2 parts of 1 wax paste, keeping the temperature not above 35 ° C. The mass thus obtained is placed on a white sheet E2,8 / 2,8 (thickness of dry layer 15 gm) with the aid of a squeegee and burned in a furnace with circulating air for 1 min. At 200 ° C. The gloss of the resulting layer (60 °) and the tendency to form craters are investigated. The test results are shown in Table 2.

For stability determination during storage, composition 1 is stored at room temperature for 14 days prior to use as a coating. It is then placed on a white sheet E2.8 / 2.8 (dry film thickness 15 gm) with the help of a squeegee and burned in a circulating air oven at 200 ° C for 1 minute. Determine the gloss (60 °) of the resulting coating and the tendency to form craters. The test results are shown in Table 2.

In testing for resistance to abrasion, Composition 1 is also applied to a DWI tin curing machine (dry film thickness 10 µm), and then

1 min Heat at 200 ° C. The pattern is then printed on the cured coating using printing inks. This is followed by a stretched top (from a middle diameter of 67 mm to a medium diameter of 57 mm at the top of a medium-diameter beverage cans), called so-called spin spin neck deformation, and the number of boxes being deformed per 1000 units. Despite their high mechanical loads during painting and stretching, these reduced boxes showed no tendency to abrasion.

table

Test results

Pavyz- jio No. Gloss (605 without holding Gloss (60 j with storage Craters ^M without storage ^a) Crates with stowage ^b) Hardness ^u ' 1 83 83 0 0 6th 2 83 83 0 0 6th 3 > 80 > 80 0 0 1 4 > 80 > 80 0 0 22nd 5 > 80 > 80 0 0 > 22 6th > 80 > 80 0 0 > 22 7th > 80 > 80 0 0 > 22 8th > 80 > 80 0 0 > 22 9th > 80 > 80 0 0 20th 10th > 80 > 80 0 0 > 22 11th > 80 > 80 0 0 - 12th > 80 > 80 0 0 - VI 83 £ 60 0 5 6th V2 > 80 <60 0 5 > 22 V3 > 80 <60 0 5 20th V4 > 80 <60 0 5 -

(a) Coating shall be carried out immediately after receipt.

b) The coating mass was initially stored for 14 days after receipt and then applied to the substrate

c) The tendency to form craters was determined visually: 0 - no craters, 5 - severe defects similar to craters formation.

(d) Measurements were made on an Erichsen model 239/2 with a force of 6N.

Example of alignment

The coating mass is prepared as described in Example 1 except that 1.4 parts of a 20% wax dispersion (trade name CERAFAK 178 from CERA CHEMIE B.V.) are added to the coating mass instead of 2.2 parts wax paste 1. Using wax paste as described in Example 1, a VI mass is obtained.

Similarly, for example 1, this VI mass is placed on a white plate E 2.8 / 2.8 (dry film thickness 15 µm) immediately after production and after 14 days at room temperature and cured for 1 min. At 200 ° C. Determine the degree of gloss (60 °) and the tendency to form craters. The results obtained are presented in the following table.

Analogously to Example 1, the wear obtained by coating VI from the coating weight is determined by applying the VI weight to the DWI beverage box machine, then firing, printing the pattern and drawing the top of the can from an inner diameter of 67 mm to an inner diameter of 57 mm. The number of cans deformed per minute is also 1000 pieces. The cans deformed in this way showed no tendency to wear.

Example The coating mass is obtained analogously to Example 1 except that 1.9 parts 2 wax paste are used instead of 2.2 parts 1 wax paste. Coating mass 2 is placed on a white tin E2,8 / 2,8 and curing and coating tests are carried out in the same manner as in the example. The test results are shown in Table 2.

The abrasion tests shall be carried out analogously to Test 1. No signs of abrasion were observed in the deformed cans.

3-10 Example

3-10 coating masses are obtained analogously to Example 1 with one difference being that 2.5 parts 3 to 10 wax pastes are added instead of 2.2 parts 1 wax paste.

Coating, curing, and coating tests are performed as described in Example 1. The results of the tests obtained are shown in Table 2.

Example The coating mass is obtained analogously to Example 1, except that titanium dioxide (clear varnish) is not added and 4.4 parts 1 wax paste are used instead of 2.2 parts 1 wax paste. Coating of white sheet E2,8 / 2.8, curing and coating testing is performed as in Example 1. The test results are shown in the following table.

Tests for abrasion shall be carried out analogous to Test 1 and no tendency to abrasion in deformed cases shall be observed.

2-3 Alignment Examples

The coating masses V2 and V3 are produced analogously to Example 1 except that 1.0 parts 11 and 12 are added instead of 2.2 parts 1 wax paste. Coating, curing and coating tests are performed as described in Example 1. The test results are shown in Table 2.

Tests for abrasion are carried out analogously to Test 1, and no tendency for abrasion in deformed cases has been observed.

Example of alignment

V4 Coating masses are prepared analogously to Example 11 except that instead of 4.4 parts of 1 wax paste, 28 parts of a 20% dispersion of polyethylene wax (trade name CERAFAK 178 from CERA CHEMIE BV) are added as described in Example 1 using 1 wax. paste.

Similarly, for example 1, the resulting V4 mass, immediately after production and after 14 days of storage at room temperature, is placed on a white plate E 2.8 / 2.8 (dry film thickness 15µκι) and cured for 1 min. At 200 ° C. The degree of gloss (60 ° C) and the tendency to form defects in the form of craters are then determined. The test results are shown in Table 2.

Analogously to Example 1, wear is investigated using a V4 mass by applying a V4 mass from a DWI - beverage can to an apparatus, burning, decorating, narrowing from an inner diameter of 67 mm to a diameter of 57 mm. The number of boxes deformed per minute is also 1000 pieces. In this case, no deformation tendencies were observed after deformation.

Claims (10)

DEFINITION OF INVENTION A coating composition for packaging containers consisting of a hydroxyl-containing, optionally modified polyester and / or hydroxyl-containing epoxy resin and / or a hydroxyl-containing acrylic copolymer, as well as a hydroxyl-reactive crosslinking and skiing material, that the lubricant used is a wax paste D consisting of dx) 3-30% by weight of one or road polio polyol inlefine finals wax, and / or to replace d ₂ ) 0-25% by weight single or formaldehyde resins, road melamine d ₃ ) 5-40% by weight of one or more acrylic resins having an OH number of 10 - 50 mg KOH / g and an average molecular weight of 2000 - 7000, and d ₄ ) 10-80 % by weight one or road organic the sum of the dy-d ^ weights of the solvents and the components in each case is 100% by weight. 2. The composition of claim 1, further comprising A) 10% to 60% by weight of one or more hydroxyl-containing, optionally modified polyesters and / or epoxy resin and / or acrylic copolymer, B) from 1% to 20% by weight of one or more aminoplastic resins and / or one or more di- or polyisocyanates bound in blocks, C) 20 to 70% by weight of one or more organic solvents, D) 0,8-8,0% wax paste, E) 0-35% by weight of one or more pigments, and F) 0-1% by weight of other excipients and auxiliaries, the sum of the weights of components A to F being 100% by weight in each case. The composition according to claims 1 and 2, wherein I know that that wax paste consists of dj 6-15 % by weight one or road polyol- finals and / or to replace polyolefinic wax, d ₂ ) 0-10 % by weight one or of several melamine formaldehyde resins, d ₃ ) 5-40% by weight of one or more acrylic resins having an OH number of 10-150 mg KOH / g and an average molecular weight of 2000-7000, and d ₄ ) 10-80% by weight of one or more organic solvents, in addition, the sum of the weights of the components d _{1 to} d ₄ is 100% in each case. 4. A composition according to claims 1-3, characterized in that it contains 3.0 to 6.0% by weight of wax paste D but has no pigment. Composition according to claims 1-4, characterized in that it contains 15-35% by weight of pigment and 1.5-3.0% by weight of wax paste. 6. The composition of claims 1-5, wherein the wax paste has a D component! containing one or more polyethylene and / or polypropylene and / or polytetrafluoroethylene waxes. 7. The composition of claims 1-5, wherein component D _{r of} the wax paste comprises one or more polyethylene waxes. 8. A process for the preparation of a composition according to claims 1-7, wherein the individual components are intimately mixed with the addition of a slip-wax paste D consisting of: dj) 3-30% by weight of one or more polyolefinic and / or substituted polyolefin waxes, d ₂ ) 0-25% by weight of one or more melamine formaldehyde resins, d ₃ ) 5-40% by weight of one or more OH acrylic resins 10 - 150 mg KOH / g and an average molecular weight of 2000 - 7000, and d ₄ ) 10 to 80% by weight of solvents,% by weight of one or more organic addition components d _x to d ₄ each containing 100%. Use of a composition according to one of claims 1 for coating a container. Use of a composition according to one embodiment for exterior cans made by high tensile strength.