Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1992-08-07
1994-06-21
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
525 65, 525107, 525438, C08L 6302
Patent
active
053228634
DESCRIPTION:
BRIEF SUMMARY
The subject-matter of the present invention is a coating compound which comprises a binder solution (I) containing of KOH/g, phenolic and/or amino resin and/or an isocyanate crosslinking agent as crosslinking agent b, weight, of ammonia and/or an amine as neutralization agent and weight. The binder a is prepared by epoxide group per molecule with number average molecular weight of 500 to 5,000 to 180.degree. C., and in the presence of catalysts, and by weight of the monomers containing carboxyl groups, stage, to 140.degree. C., in the presence of at least 2% by weight, based on the weight of the ethylenically unsaturated monomers C, of peroxidic initiators, the total weights of the components A to C being in each case 100% by weight.
The invention further relates to the process of producing these coating compounds and to the use thereof, in particular for exterior coating of deep-drawn cans.
Packing receptacles, for example cans, tubes, drums, buckets and the like which are often known as packaging containers, generally carry on their outside a coat of paint, the purpose of which is mainly to decorate the packaging containers and to protect them from corrosion. For this reason the basic requirements of suitable coating compounds are problem-free processing and blemish-free surfaces. The blemish-free decorative coat must, however, withstand the often extreme stresses encountered in the manufacture and use of the packaging containers (folding, flange formation, deformation, sterilization etc.).
The exterior coating of packaging containers usually consists of a multicoat system comprising a basecoat as the decoration carrier, a printed coat and, if appropriate, a colorless protective coat, the so-called silver varnish. Basecoats which do not carry a colorless protective coat as the exterior finish are subject to particularly severe demands. These basecoats are also known as non-varnish exterior paints.
Non-varnish exterior paints must be highly compatible with the subsequent print, i.e. they must be capable of accepting print satisfactorily, they must possess good adhesion and good resistance to condensation. The resultant coatings must have high gloss, i.e. a degree of gloss (60.degree. reflection angle) >80, they must possess high abrasion resistance and a smooth surface structure, i.e. one free from pits and the like.
Non-varnish exterior paints of this type are known (cf. for example Ullmanns Encyklopadie der technischen Chemie [Ullmann's Encyclopedia of Industrial Chemistry], 4th edition, 1978, Volume 15, pp. 713-714). Basic raw materials for these paints are modified alkyd resins, epoxy resins, epoxy resin esters, polyester and polyacrylate resins and usually also aminoformaldehyde or phenolformaldehyde resins or isocyanates as crosslinking components.
Due to increasing rates of production of the coating line for coating, inter alia, two-part beverage cans and similar containers and because of the high stresses acting on the applied coating compound in the so-called spin-necking process, in which the cans are subject to very severe deformation in their upper region, known exterior can paints pose considerable problems. Even given such an extremely severe deformation, it is essential to ensure that the paint film is undamaged during the spin-necking process. This requirement can only be met with coating compounds which give rise to flexible paint films. It is however furthermore essential to ensure that the resultant coatings withstand the extreme mechanical stresses encountered in can manufacture and in can filling. This means that the resultant paint films must have high abrasion resistance and a correspondingly high degree of hardness, especially scratch hardness. It is true that isocyanate-crosslinked systems meet the requirement for good flexibility and at the same time a good degree of hardness, but these systems suffer the drawback of a marked tendency to yellowing in pigmented white paints.
A further drawback of the known coating compounds is the fact that they represent conventional, i.e. org
REFERENCES:
patent: 4399241 (1983-08-01), Ting et al.
Dartmann Holger
Figge Hans-Jurgen
Aylward David
BASF Lacke & Farben Aktiengesellschaft
Marquis Melvyn I.
Sabourin Anne Gerry
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