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...
Patent
1989-08-16
1990-07-10
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 6100
Patent
active
049408410
DESCRIPTION:
BRIEF SUMMARY
The invention relates to aqueous two-component paints containing customary additives and, if appropriate, pigments, mainly for one-coat coating of high-resistant finishing sheeting and continuous edging.
At the present time there is a great gap within the field of surface materials between the laminates employed for coating chipboard or other boards made from cellulose fiber products and the finishing sheeting.
Impregnated paper which when pressed onto boards represents a pretreatment in the sense of a priming coat or[sic] frequently also displays a decorative effect decorative sheeting), has been known to the furniture and board industry for a long time. The scarcity and increased costs of genuine veneers has contributed to a quite significant degree to the increase in utilization of such a sheeting. After being pressed onto chipboard or hardboard the sheeting must be painted, since otherwise the surface effect is inadequate.
In an effort to simplify production, an improved version of impregnated paper, the finishing sheeting, has been gaining more and more in importance. This is an impregnated self-colored or printed paper sheeting which may be provided with a coating of paint already by the sheeting manufacturer as a follow-up to impregnation.
The finishing sheeting and continuous edging (for continuous coating of edges) thus obtained are supplied in the form of rolls to the furniture and board industries where they are glued to the substrates, such as, for example, chipboard or hardboard, under the influence of pressure and heat. Surfaces are obtained in this manner which usually do not require further painting, in other words they can be further processed "straight from the press".
The paints used for painting the finishing sheeting and continuous edging under discussion and the coatings produced from the paints must do justice to stringent demands.
Thus no organic solvents and/or formaldehyde, or only small amounts of these, should be evolved during the coating of the finishing sheeting and continuous edging and in further processing of the coated sheeting and edging.
Furthermore, it is desirable that the printed but not yet pressed-on sheeting does not curl, let alone coil.
It is of particular importance that the paints used for coating the finishing sheeting and continuous edging should achieve, after being heat-treated for less than 60 seconds, usually 10 to 20 seconds, at 140.degree. to 210.degree. C., such a degree of curing that they survive the press conditions used in the production of boards and furniture components (for example 5 to 30 seconds at 150.degree. to 180.degree. C. and 5 to 20 kp/cm.sup.2 ; more severe press conditions up to 180 seconds at 170.degree. to 180.degree. C. and up to 30 kp/cm.sup.2) unimpaired without showing blocking characteristics or discoloration. The surfaces obtained in this manner would be expected to possess an abrasion resistance as high as possible and attain the resistance values required for group A of DIN 68861.
Group A of DIN 68861 specifies the following requirements for the surfaces under test:
______________________________________ Testing agent DA R
______________________________________
1 Acetic acid 16 h 0
2 Citric acid 16 h 0
3 Sodium carbonate 16 h 0
4 Ammonia water 16 h 0
5 Ethyl alcohol 16 h 0
6 White, red and southern wines
16 h 0
7 Beer 16 h 0
8 Cola beverages 16 h 0
9 Instant coffee 16 h 0
10 Black tea 16 h 0
11 Blackcurrants 16 h 0
12 Condensed milk 16 h 0
13 Water 16 h 0
14 Gasoline 16 h 0
15 Acetone 16 h 0
16 Ethyl butyl acetate 16 h 0
17 Butter 16 h 0
18 Olive oil 16 h 0
19 Mustard 16 h 0
20 Kitchen salt 16 h 0
21 Onion 16 h 0
22 Lipstick 16 h 0
23 Disinfectants 16 h 0
24 Black ballpen ink 16 h 0
25 Rubber stamp ink 16 h 0
26 Cleansing agents 16 h 0
27 Cleansing solution 16 h 0
______________________________________
DA = duration of action by the testing agent
R = results
From a comparative observation of the tested and untested areas, the result of the test is to be giv
BASF Lacke & Farben Aktiengesellschaft
Schofer Joseph L.
Smith Jeffrey T.
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