DE7139282U - PLASTIC VENEER WITH ADHESIVE APPLIED TO THE REAR - Google Patents

Description

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ENNING ■ MAAS - SESLER · MEINIG · LEMKE · SPOTT ty

PATENT LAWYERS BERLIN ■ MÖNCHEN · AUGSBURG

J. Pfenning, DIpL-ln »· Barte ImtanwStt · running. Moss. Seller. AWnI ₈ · Unk «. Ridicule * * ·} _J "" V ^D ! ^pl ; " ^Ch ^^" ^MI '' ^K ** ' Ht seller, DIpL ^ InQr * Benin

MaInIu, K. H., OlpL-Phye. · Äertln 0. K. Lemke, DIpL Ing. · Augtburo Or. Α ridicule Dlpl-Ctnm. · Munich

BORO BERLIN: D1000 Berlin 19 Oldenburgallen 10

Telephone: 030/3045521/3045522

Telegram address: Seilwehr patent

hm hm message * · »Umer sign Berlin

YoerMtarol Oar speaker * Dal ·

Me / St September 2nd, 1975 G 71 39 282.0

Firaa Viktor Bausch & Co. Kanalstrasse 7-11, 1OGO Berlin 47

Plastic veneer with adhesive applied to the reverse

The innovation relates to plastic veneers with a reverse side applied adhesive for coating documents, preferably boards, chipboard, hardboard, etc.

It is known to use plastic veneers on the basis of thermoplastics, e.g. polyvinyl chloride, to be coated on the back with a pressure-sensitive adhesive, e.g. »ttf based on acrylate resins.

The bonding by means of such adhesive is defective as the plastic veneer kanne be easily peeled off from the backing This drawback is inter alia due to the migration of the plasticizer from the thermoplastic

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into the adhesive, the adhesive strength of which decreases noticeably after a while. In addition, the thermoplastics exhibit After bonding, there is a clear shrinkage, which is due to the occurrence of tensions over the entire surface reduces the adhesion.

With knowledge of and to avert this disadvantage, attempts have been made to finish plastic veneers based on thermoplastics on the reverse instead of the known pressure-sensitive adhesives with so-called hot-melt clips, such as, for example, polyolefin copolymer strips. The melting point is at temperatures of about 100 ⁰ C to 200 ° C. There is no sticking below the melting point. However, these temperatures are above the softening point of conventional thermoplastics.

Although one can thermoplastics in narrow strips as edge at high speeds, at temperatures of about 100 ⁰ C on respective special machines by means of ^ melt adhesive vorkler ben, but it is aas not possible for the reasons mentioned above, coated with hot melt adhesive thermoplastics in larger areas by pressing in the heat glued to a surface, for example in heated presses or by hand with a hot iron.

The task according to the innovation is therefore essentially based on plastic veneers coated with hot-melt adhesive

7139282 110176

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even in larger areas using the usual heated presses on the base in the heat under · * pressure stick on.

The solution according to the innovation is based on the fact that the plastic veneer consists of paper impregnated with thermosetting or elastomeric resins and is provided as a hot-melt adhesive. Such thermosetting films can according to DAS 1,287,040 or US Pat. No. 3,392,049, in which the paper is impregnated in a known manner with curable amino resins dissolved in organic solvents or their precondensates, the resin content not exceeding 25 to 30% of the weight of the base paper.

Instead of the aminoplasts mentioned there, other thermosets, e.g. polyacrylates or polyesters, can also be used Elastomers of the polyurethane type, use.

The softening or decomposition point of these resins is far higher than the melting point of hot melt adhesives that melt even at high temperatures. Especially those at temperatures of 200 ° C and glue that melts over it, e.g. ethylene vinyl acetate copolymers, ensure a particularly strong and durable Bonding. At such temperatures, a thermoplastic plastic veneer would simply melt.

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further ... the • · · ·
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• ... and ; - -4- combination from Hot melt adhesive advantage A

Duroplastics is that the plastic veneer is not for Shrinkage tends to occur and therefore no uncovered areas occur on the edges of the veneered surface.

It is within the scope of the innovation that the thermosetting veneers coated on the back, preferably with hot-melt adhesive which in the event of complete condensation or polymerization of the precondensates or polymers used are brittle and fragile, to be used in such a state that in itself there is still condensation or polymerization would require. These given ^.! -: complete condensation or polymerisation or polyaddition when using elastomers, takes place in de * heated during hot pressing Press or under a hot iron, the higher the melting point of the, the shorter the times required used hot melt adhesive.

Exemplary embodiments of documents with the aforementioned adhesives applied, according to the innovation plastic veneers are in reproduced in the drawing.

1 shows a section through a plastic 1, namely one impregnated with the precondensate of a heating resin Paper made from a copolymer with a hot melt liver 2 is applied to the base 3 and

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Pig. 2 a corresponding cut, but the plastic veneer 1 is on you Unfc * rl «S # 3 with an adhesive 4 applied on an acrylate basis.

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Claims (3)

ADAPTATION 1. Plastic veneer with adhesive applied to the back for coating documents, preferably chipboard or hardboard, characterized in that it consists of paper impregnated with thermoset or elastomeric resins and is provided as an adhesive hotmelt adhesive, for example based on thermoplastic copolymers. 2. Plastic veneer according to claim 1, characterized in that that pressure-sensitive adhesive, such as a polyacrylate, is provided as the adhesive. 3. Plastic veneer according to claim 1, characterized in that that the plastic veneer condenses out incompletely or polymerizes incompletely or with incomplete polyaddition when using elastomers of its Production mentioned precondensates, such as aminoplasts, prepolymers or elastomers, such as polyurethanes, in the Heat (e.g. in a heated press or under a hot iron) is applied to the surface. Sdiufzonspr. 3 If. Bf. 2 ^ deleted 1" f. ti 7139282 3/11/76