FI58528B - LOESTAGBART PAPPER - Google Patents

Description

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Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2361996.7 (71) Hoechst Aktiengesellschaft, 6230 Frankfurt / Main 80, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Hans Werner Dorr, Wiesbaden-Biebralta, German Liitt (DE) (7M Oy Kolster Ab (5¾) Removable paper - Löstagbart papper

The invention relates to wallpaper and poster paper, the surface of which is such that, after gluing to a wall or other wall with glue, the paper can later be easily detached from gluing by tearing alone and which consists of two felted fibrous layers, one of which contains polyolefin fibers.

It is often useful and necessary to remove wallpaper or poster from a glued surface after days, weeks or years with a water-soluble adhesive. It is known that this work is difficult, time consuming and dirty. Normally, the paper to be removed is moistened and after some time removed from the substrate with a spatula or similar device. In this case, the floor and clothes, especially carpets, are most often soiled. Moreover, this method of operation is not possible if the glued sheet-shaped material is made water-repellent. Today, however, the wallpapers are made somewhat or completely washable. For these reasons, it has long been desired to have a wallpaper or poster that can be removed in a simple manner without waste from a glued wall or other glued surfaces, even if it is not moistened with water.

2,58528

It is known to glue to a wall to be wallpapered a base wallpaper consisting of paper provided on one side to repel the adhesive or to cover the wall with polystyrene foam tapes. In either case, it is possible that the glued wallpaper can later be removed from the wall without difficulty, if necessary. The downside of these procedures is that they involve wall pretreatment in addition to the actual wallpapering. This raises the cost of wallpapering. The same applies to known methods in which the wall to be wallpapered is brushed with an emulsion or dispersion capable of forming a surface from which the glued wallpaper can also be easily removed later. The so-called crackable Paper wallpapers consisting of two (only loosely) layers of paper adhering to each other, which then, when removed from the wall, split into two layers so that the layer with the printed wallpaper pattern is removed and the second layer remains on the wall as a kind of waste paper that can be wallpapered again. This procedure has the disadvantage that either after several tapings there are several layers of waste paper in the wall, which sometimes have to be removed and then even more difficult to remove, or that unscraped wallpaper still has to be used on top of the first wallpapering, which is obviously harmful. It is further known to apply a layer of a mixture of emulsion wax and thermoplastic to the gluing side of the wallpaper and thus to make the layer repellent as required. However, the production of these adhesive-repellent layers is relatively expensive, especially since the wet pulp web is first made into a finished dry wallpaper paper and this must then be dried again after brushing the emulsion.

The object of the present invention is, by avoiding said drawbacks, to provide a paper for wallpapers and posters which, once glued to the wall, can be easily removed again. The problem is solved by starting from a known wallpaper and poster paper with a surface layer, by means of which the paper can be easily detached from the gluing after gluing with a glue to a wall or wall with a simple pull.

The invention is characterized in that a) the second layer corresponds to ordinary wallpaper raw paper and b) the second layer is wallpaper raw paper in which Uo-80% by weight of all fibers are polyolefin fibers and in which the aqueous dispersion is flocculated thermoplastic or natural substance in an amount of 0.5 ~ 5% by weight. the amount of all fibers.

Erona ns. with respect to the fissile wallpapers, which likewise consist of two fibrous layers, is that the two fibrous layers of the paper according to the invention are felted together 3,58528. The paper is thus produced in a paper machine in which two layers of material can be formed separately and, after the sheeting and dewatering process, are joined together by felting.

Preferably, an Inverform paper machine is used to make the paper.

A special feature of this type of machine is the use of a flat wire with as many feeds arranged in succession in the running direction of the web as there are layers in the paper or board to be produced. In this case, the private mergers can take place in the desired order. Preferably, an adhesive-repellent layer is applied to the second layer already formed on the flat wire.

The second fibrous layer of the paper according to the invention corresponds in composition to ordinary wallpaper raw paper, i.e. contains groundwood and / or chemical pulp fibers, adhesive and possibly filler in the usual proportions, as stated, for example, in DIN 6730. The second layer is basically formed but differs from the usual, however, in particular in the fibers used and at the same time in the presence of a relatively small amount of flocculated thermoplastic or natural material.

The fibers contained in the usual aberrant layer are 1 + 0 to 80% by weight, preferably about 60%, of polyolefin fibers and 20 to 60% by weight, preferably about 1 + 0% by weight, of cellulose fibers. Suitable polyolefin fibers are, in particular, polyethylene or polypropylene fibers. Polyolefin fibers can be produced by the methods described in DE-A-1 951 576 and 2 117 370. Preferably, polyethylene or polypropylene fibers produced by the method of DE-A-2 117 370 are used, which prove to be excellent in that they have a very large surface area, namely more than 1 m / g because they result in a particularly strongly felted paper layer. A very preferred polyolefin pulp from which the necessary stable fiber suspension can be prepared is described in DE-A-2 208 555 · The pulps described therein are preferably used for the production of a polyolefin-containing layer of paper according to the invention.

Thermoplastic plastics or natural substances precipitated from dispersions in the polyolefin-containing layer are flocculated from non-emulsifier-free natural or synthetic latexes, for example butadiene / styrene copolymer, rubber, polychloroprene or butadiene polyethylene / polyacrylene / polyacrylene. It is particularly preferred to use an emulsifier-free dispersion of ethylene and an alkali metal salt of a simply unsaturated acylamide-N-sulfonic acid. These are alkali metal salts of the formula R CH = C (R iCONMe-SO 2 Me, in which R and R

1 * 58528 denote hydrogen or an organic radical containing 1 to 10 carbon atoms and Me denotes an alkali metal, in particular potassium. The preparation of such ethylene copolymers is described in DE-Application 1 720 667 * Preferably, the dispersions described in Example 9 of said DE-Application are used.

The addition of the dispersion of thermoplastic particles to the pulp and the flocculation of the particles expediently takes place only after the pulp has been ground, and the pulp and polyolefin suspension have been mixed. Due to flocculation, for example with aluminum sulphate, the copolymer, after sheeting and dewatering, remains on the paper machine wire almost completely in the form of finely divided flakes in the paper.

The basis weight of the paper layer containing the conventional composition follows the desired paper quality. For example, it is about 50-65 g / m for simple wallpaper, 80-100 g / m for better wallpapers and over 110 g / m for heavier wallpapers. For cost reasons, groundwood is used as the fibrous material for this layer mixed with a greater or lesser amount of cellulosic fiber. In addition, there are the usual adhesives. For demanding applications, this fibrous layer can also consist of a completely wood-free rigid long-fibrous fibrous material.

The basis weight of the paper layer containing the unusual composition is most often 2 to 100 g / m 2. Also in it, the fiber portion present in addition to the polyolefin fiber portion may consist more or less of a large proportion of the groundwood.

The bilayer paper according to the invention can be glued in a known manner with a water-based adhesive to the desired substrate. Suitable pastes are all commercially available products, for example starch or starch derivatives, cellulose ether, polyvinyl alcohol and mixtures of these substances. However, the paper may also contain, on the side formed of the pclyolefin fiber layer, a water-activatable material such as water-soluble cellulose ethers, water-soluble or water-swellable starch derivatives or polyvinyl alcohols, or polyvinyl alcohol, obtained by depositing or dusting the electrostatic layer. Such a layer should be 10-100 g / m, especially 10-30 g / m thick. The papers thus prepared can be glued without brushing the adhesive and only need to be activated with water before gluing.

Wallpapers and posters made of paper according to the invention are attached to the surface to be glued by means of a water-activated adhesive so that they remain firmly on the wall after the adhesive has dried, but can later be removed from the wall by hand as whole strips or at least in large strips without softening or other preparations. in pieces, after the point of adhesion has been raised from the wall with or without an instrument. Example 2 1 layer: wallpaper raw paper (basis weight 80 g / m) TO weight # ground 30 weight # bleached pine sulphate pulp 15 weight # (calculated from ground plus pulp) kaolin coarse grinding and full gluing 2 2 layer: adhesive-repellent layer (basis weight 20 g / m m) 60% by weight of polyolefin fibers 1 + 0% by weight of bleached pine sulphate pulp 5% by weight (calculated from polyolefin fibers) of 30-1 + 0% by weight of ethylene copolymer dispersion, doped with an amount of aluminum sulphate such that the pH is 1 +, 5 ·

Claims (6)

6,58528 1. Wallpaper and poster paper, the surface of which is such that, after gluing to a wall or other wall with glue, it can be easily detached from gluing by tearing alone and consists of two felted fibrous layers, one of which contains polyolefin fibers, characterized in that: wallpaper raw paper and h) the second layer is wallpaper raw paper having 1 + 0-80 wt.% of all fibers being polyolefin fibers and having an aqueous dispersion of flocculated thermoplastic or natural material in an amount of 0.5 to 5 wt.% based on the amount of all fibers. Paper according to Claim 1, characterized in that the polyolefin fibers have a surface area of more than 1 m / g and are made of polyethylene or polypropylene. Paper according to Claim 1 or 2, characterized in that the flocculated thermoplastic is a copolymer of ethylene and an alkali metal salt of simply unsaturated acylamide-N-sulfonic acid. 1+. Paper according to Claims 1 to 3, characterized in that the weight of the layer containing 2 polyolefin fibers is 5 to 100 g / m 2. Paper according to Claim 1+, characterized in that ...... The weight of the layer containing 2 polyolefin fibers is 5 ~ 30 g / m 2. Paper according to Claims 1 to 5, characterized in that the layer containing polyolefin fibers is covered with an adhesive layer which can be activated by water.