DE1074001B - Process for the production of a leather substitute (fabric or synthetic foil leather) with a matt suede-like surface - Google Patents

Description

GERMAN

LIBRARY

OF THE GERMAN

PATENT OFFICE

Patent 1,043,275 relates to a leather substitute with a matt, suede-like surface in shape of fabric or synthetic leather foil, containing a carrier material, coated with mixtures of cork flour or similar fillers, such as wood or leather flour or ground cellulose and mixtures of such polyesters and polyisocyanates, which at elevated temperature form high molecular weight polyurethanes react with each other, the last layer being expedient before the application of the cork flour coating mechanically roughened (sanded), and the ratio of cork flour to binder at least is 1: 2.

Such leather substitutes are expediently produced on the way that the polyester and Polyisocyanates in a suitable anhydrous and alcohol-free solvent, such as. B. butyl acetate or Ethyl acetate, dissolved and intimately mixed with the cork flour before application to the pad will. The cork flour is intimately wetted by the starting materials in solution, which are initially in low molecular weight form, and the subsequent polyaddition reaction so firmly on the high molecular weight and crosslinked polyurethane resin formed in situ bound that due to the excellent properties of this resin a very hard-wearing and at the same time a rough coating arises. After the carrier material has been coated, it wixd Solvent evaporates and the application of heat causes the reaction between polyester and polyisocyanate brought about in a known manner.

Woven fabrics, knitted fabrics, nonwovens, felts and paper can be used as carrier materials for polyurethane coatings containing cork flour and the like can be used. You can also use films made of natural or plastics, such as. B. cellulose esters or ethers, polymers or copolymers of vinyl compounds, natural or synthetic rubber, Polyamides or the like, provided with coatings that consist of a mixture of cork flour and the components a polyaddition resin, d. H. a crosslinkable polyurethane, for example from low molecular weight Polyester resins and polyisocyanates.

It is not important to use the carrier such. B. the fabric, with the mixture of cork flour and to coat the components of the polyurethane resin directly. Rather, the carrier material can also initially be coated with different types of natural or synthetic materials, whereupon the cork flour-containing layer is launched. The choice of the natural or plastic layer closest to the fabric has to be carried out in such a way that the addition resin layer containing cork flour can be bonded to it with good adhesion. For example, it is possible to use a fabric coated with a plasticized polyvinyl chloride paste Method of manufacture

a leather substitute

(Fabric or synthetic foil leather)

with a matt, suede-like surface

Addendum to patent 1,043,275

Applicant:

Göppingen calico and artificial leather works

GmbH,
Göppingen, Bahnhofstr. 25-27

Willibald Graebner, Göppingen,
has been named as the inventor

by subsequent coating with the mixture of cork powder and the solution of the polyurethane resin components To equip suede-like, if one by appropriate processing of the polyvinyl chloride layer ensures that the cork flour-containing polyurethane resin layer adheres to it. This processing of the as a document Serving polyvinyl chloride layer can be done, for example, in such a way that they can be sanded or by sanding it, or by pressing a suitable grain on it with a large, gives the adhesion of coatings promoting surface.

Instead of cork flour, other fillers can be used which produce effects similar to those of z. B. wood flour, leather flour, ground cellulose and the like. The adhesion of kprkmehlhaltigen, suede-like The surface-producing coating layer on the carrierless film is, if necessary, roughened the film causes. When producing the foil with a suede-like surface, the procedure is as follows: that the finished film by means of a suitable device, such as. B. an emery roller, roughened and then the mixture of cork flour and the components of the polyaddition resin, which are usually in Solution present, if appropriate applied to the film in the presence of an accelerator, the volatile Solvent evaporated by drying at 6Ό to 70 ° C and by prolonged heating to 70 ° C the

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Formation of the polyaddition resin from its components and brings about its further networking.

It has now been shown that the mixture of polyurethanes and cork flour or similar fillers then adheres particularly well to the surface of the fabric or synthetic leather foil when following Measures observed:

The surface of a film or a fabric synthetic leather is embossed with a grain, i.e. H. a matt embossing, provided, whereupon a polyurethane-based varnish is applied. Then the The product obtained in this way is again embossed matt and only then with the mixture consisting of cork flour and Polyurethanes, provided.

example

A fabric with a square meter weight of 145 g is applied in two steps with 300 g of a coating compound from 100 kg polyvinyl chloride, 60 kg dioctyl phthalate, 10 kg iron oxide brown and 2 kg lead stearate ao Mistake. The polyvinyl chloride layer is gelled by heating at 170 ° C. for 4 minutes. Afterward this layer is made plastic in the usual way by heating and with a sandblasted or otherwise matted embossing roller embossed, so as that it becomes rough and dull. Then you paint a thin layer of a on this matt surface Solution of 50 parts of the polyester from 3 moles of adipic acid, 1 mole of trimethylolpropane and 3 moles of butanediol in 50 parts of anhydrous and alcohol-free ethyl acetate, which is 30 parts shortly before spreading Tolylene diisocyanate and 50 parts of a tertiary amine has been added. After the ethyl acetate has evaporated the surface treated in this way is now again embossed matt in the manner described above. Finally, the product obtained in this way is a mixture of 33 kg of a low molecular weight polyester from dihydric alcohols and dihydric aliphatic dicarboxylic acids dissolved in 67 kg of butyl acetate are, 10 kg of a 75% solution of the condensation product known under the trade name "Desmodur TH" from tolylene diisocyanate and a low molecular weight polyester, 10 kg of a 10%, as an accelerator serving solution of a tertiary amine in chloroform, 16 kg cork flour and 10 kg iron oxide brown coated. After the solvent has evaporated, this is achieved by subsequent drying at 60 to 70 ° C is reached, the coated one is heated Fabric for 4 hours at 70 ° C to allow the formation and crosslinking of the binder for the cork flour to effect serving polyurethane resin.

Claims (1)

PATENT CLAIM: Process for the production of a leather substitute (fabric or synthetic leather) with a matt, suede-like surface according to patent 1 043 275, characterized in that the surface of a Foil or fabric synthetic leather with a grain embossing, d. H. a matt embossing is, whereupon then applied a varnish based on polyurethane, the product obtained again matt embossed and only then with the mixture consisting of cork flour or similar fillers, such as Wood or leather flour or ground cellulose and polyester-diisocyanate mixtures, coated will. © 909 727/480 1.60