Aqueous pigmented two-component lacquers for single-layered coat

Details Aqueous pigmented two-component lacquers for single-layered coat Aqueous pigmented two-component lacquers for single-layered coat

1988-09-27

1990-07-17

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524512, 525155, C08L 6104

Patent

active

049421980

DESCRIPTION:

BRIEF SUMMARY
The invention relates to aqueous two-component lacquers containing pigments and other customary additives for single-layered coating of finish films and continuous edges.
Impregnated papers which, when pressed onto sheets, represent preparation in the context of priming (primer film) or frequently also have a decorative effect (decorative film) proved themselves a long time ago in the furniture and sheet materials industry. The shortage and increase in the price of true veneers has contributed quite considerably to an increased use of the latter type of films. After pressing onto chipboard or hardboard, the films must be after-lacquered, since otherwise the surface effect is inadequate.
In the course of simplification of the production process, an improved type of impregnated paper, the finish film, has been making more and more of a break-through. This is impregnated monochrome or printed paper films already provided with a coat of lacquer at the film manufacturer's after the impregnation.
The finish films and continuous edges (for continuous edge coating) thus obtained are supplied as roll goods to the furniture and sheet materials industry, where they are glued to substrates, such as, for example, chipboard or hardboard, under the action of pressure and heat. Surfaces which as a rule do not require further lacquering, that is to say can be further processed "from the press" are obtained in this way.
The finish films or continuous edges in question can be lacquered either with a pigmented lacquer or with a clear lacquer.
In both cases, the lacquers and the coatings produced from the lacquers must meet high requirements.
Thus, only small amounts of organic solvents and/or formaldehyde, if any, should be emitted both during coating of finish films and continuous edges and during further processing of the coated films and edges.
It is also desirable for the lacquered but not yet pressed films not to curve or even roll up.
It is particularly important for the lacquers used for coating the finish films and continuous edges to be hardened after heat treatment at 140.degree. to 210.degree. C. lasting less than 60 seconds, as a rule 10 to 20 seconds, to the extent that, under the pressing conditions applied during production of sheets or items of furniture (for example 5 to 30 seconds at 150.degree. to 180.degree. C. and 5 to 20 kp/cm.sup.2 ; intensified pressing conditions: up to 180 seconds at 170.degree.-180.degree. C. and up to 30 kp/cm.sup.2), they survive without damage and without displaying blocking effects or discoloration. The surfaces thus obtained should have the minimum possible metal abrasion and the maximum possible scratch resistance, and as far as possible should achieve the resistance values required in DIN standard 68861 group A. The following requirements are imposed on the surfaces to be tested in group A of DIN 68861:


______________________________________ A Test agent At Res ______________________________________ 1 Acetic acid 16* 0 2 Citric acid 16* 0 3 Sodium carbonate 16* 0 4 Aqueous ammonia 16* 0 5 Ethyl alcohol 16* 0 6 White wine, red wine, fortified wine 16* 0 7 Beer 16* 0 8 Cola drinks 16* 0 9 Instant coffee 16* 0 10 Black tea 16* 0 11 Blackcurrant juice 16* 0 12 Condensed milk 16* 0 13 Water 16* 0 14 Petrol 16* 0 15 Acetone 16* 0 16 Ethyl/butyl acetate 16* 0 17 Butter 16* 0 18 Olive oil 16* 0 19 Mustard 16* 0 20 Sodium chloride 16* 0 21 Onion 16* 0 22 Lipstick 16* 0 23 Disinfectant 16* 0 24 Black ballpoint pen ink 16* 0 25 Stamp dye 16* 0 26 Cleaning agents 16* 0 27 Cleaning solution 16* 0 ______________________________________ At = Action time of the test agent Res = Result


Description of the results

The result of testing shall be stated in accordance with the following rating scale by comparing the tested and non-tested surface: not changed largely undamaged
There is a great demand for pigmented film top lacquers with a high covering power.
The abovementioned requirements for a low solvent emission can be

REFERENCES:
patent: 4303581 (1981-12-01), Levine et al.

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