Compositions: coating or plastic – Coating or plastic compositions – Proteinaceous material containing
Patent
1994-02-03
1995-08-15
Green, Anthony
Compositions: coating or plastic
Coating or plastic compositions
Proteinaceous material containing
106146, 156 60, 156326, C08L 8900
Patent
active
054415624
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a water-containing adhesive based on glue and resin and to its use for bonding paper to plastic surfaces.
2. Discussion of Related Art
Glues are aqueous colloidal solutions of bones or fish, carboxymethyl cellulose and cellulose ethers, dextrin and starch, derivatives and polyvinyl alcohol.
Glues belong to the class of one-component, physically cold- or hot-setting adhesives in which the water escapes during the bonding process. Accordingly, they are mainly used for bonding absorbent materials, such as paper, cardboard or wood, to one another. However, glues are not suitable for permanently bonding paper, particularly paper labels, to plastic surfaces (see K. Dullinger "Etikettiertechnik von A bis Z" in Zeitschrift fur Lebensmitteltechnik (ZFL) 1987, pages 503 to 507).
It is also known that synthetic resin dispersions can be added to glues, for example starch and dextrin glues, to improve their resistance to water. Synthetic resin dispersions, for example polyvinyl esters and polyacrylates and also copolymers thereof, are also used either on their own or together with polyvinyl alcohol for bonding paper to plastic. The object of adding polyvinyl alcohol is to increase the wet adhesive strength of the dispersion. Fully synthetic systems such as these are eminently suitable for bonding paper to plastic surfaces (see Dullinger, loc. cit.). However, they are attended by the disadvantage that high wet adhesive strength can only be achieved by adding relatively large quantities of PVAC which, at the same time, distinctly reduces adhesion to plastic surfaces.
DE 40 00 241 A1 describes an adhesive of animal glue, glue hydrolyzate or acid casein and at least one substance from the group consisting of urea, thiourea, N-alkyl urea and guanidine nitrate and optionally other additives typically used in glue production. Gum rosin, sugar or dextrin may be added to improve the non-curl properties. Glycerol or polyglycol, for example, may be added as a hygroscopic substance. The adhesive may be used in the form of an aqueous solution or solid. The document in question claims the use of the adhesive as a heat-sealing material or hot adhesive, more particularly for surface coating.
Accordingly, the problem addressed by the present invention was to provide an adhesive which, similarly to glues, would be largely based on natural raw materials, but which would develop similar strengths to synthetic resin dispersions in the bonding of paper to plastic surfaces and would have a high wet adhesive strength.
SUMMARY OF THE INVENTION
The solution to this problem as provided by the present invention is defined in the claims and resides principally in the combination of
DETAILED DESCRIPTION OF THE INVENTION
Although the glues may also be based on synthetic polymers, for example polyvinyl alcohol, glues of one or more constituents from the following group are preferred: casein, starch, starch derivatives, dextrin and cellulose ethers. A suitable casein is, above all, the casein obtained from milk by precipitation with an acid. Suitable starch derivatives are those obtainable by reaction of native or degraded starch, for example oxidatively degraded starch. These starch derivatives are generally reaction products with, for example, ethylene oxide, propylene oxide, acrylonitrile, chloroacetic acid or even epoxypropane sulfonic acid. The degree of substitution should be relatively low, for example between 0.02 and 0.1 DS. The dextrin used may be a commercial thin-, medium- or thick-boiling dextrin which may be obtained in known manner by degradation of starch.
The rosin is a glass-like amorphous material with an average molecular weight below 2,000 g/mole. It is obtained from the crude rosin of conifers and consists predominantly of unsaturated carboxylic acids with the empirical formula C.sub.20 H.sub.30 O.sub.2, such as abietic acid and isomers thereof. However, more or less neutral substances, such as fatty acid esters, terpene alcohols and hydrocarbo
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U. Dullinger "Labelling Technique from A to Z (Part 2)" in Zeitschrift fur Lebensmitteltechnik (7FL) 1987, pp. 503-507 (no month).
Broich Ludwig
Herlfterkamp Bernhard
Onusseit Hermann
Green Anthony
Henkel Kommanditgesellschaft aug Aktien
Jaeschke Wayne C.
Ortiz Daniel S.
Wood John D.
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