DE2109312A1 - Method of decorating polyurethane coatings - Google Patents

Description

β MUNICH SO, MAUERKIRCHERSTR. Aft

A-GEiGY AG BASEL (Switzerland)

Case 6q86

Germany

Munich, February 26, 1971

Attorney file 20 686

Process for decorating polyurethane coatings

Notices and. Coatings based on polyurethanes have especially in the clothing and Textile industry attained great importance. However, due to the elasticity of this material, it has not previously been possible to obtain flawless multicolor prints on this material.

It has now been found that Polyurethanbeschlchtungen can be decorated advantageously if you to containing a decorating surface with a temporary support made of paper, aluminum or regenerated cellulose

109838/0192

a peelable film made of vinyl resin and pigments, and

/ made of polystyrene /

an underlying layer of alkyl cellulose / or of a mixture of nitrocellulose and an aminoplast and the temporary carrier separates from the final carrier.

The provisional to be used according to the procedure Carriers contain an optionally laminated aluminum foil, a foil or a band made of regenerated aluminum as a base Cellulose or paper, preferably a paper with little

/ preferably / or no pores at all (Kraft paper). The foils are coated with a mixture of nitrocellulose and an aminoplast. The proportion of nitrocellulose in this mixture is preferably kO to $ 60.

A urea-formaldehyde condensate is preferably used as the aminoplast. The best results are obtained with alcohol-soluble condensates.

The vinyl resin peelable film preferably has a thickness of 0.5 to 10 µm. The vinyl resins used are expediently made of polyvinyl chloride or a copolymer Vinyl chloride and vinyl acetate, for example from 8θ to $ 85 Vinyl chloride and $ 20 to 15 vinyl acetate. The peelable Film can consist of one or more layers, for example from a layer of an uncolored vinyl resin and overlying layers of pigmented vinyl

109 8 38/0192

resins. The one overlying the uncolored vinyl resin layer pigmented layer or layers can also consist of another resin, for example an acrylic resin. The pigment particles are conveniently from the vinyl resin enveloped.

The pigments used are, for example, inorganic ones such as carbon black, metal powder, titanium dioxide, iron oxyhydrates, Ultramarine, chromium oxide, but especially organic pigments, e.g. from the class of azo, Anthraquinone, phthalocyanine, nitro, perinone, perylenetetracarboxylic diimide, Dioxazine, thioindigo or quinacridone dyes.

The production of the provisional carrier is best carried out in accordance with the information in the Swiss patent application No. 14585/69 by placing one of the faces of the Paper backing with a solution or emulsion of nitrocellulose and aminoplast in a volatile organic | Solvent printed and then dried. In this way, a thin layer containing a mixture is obtained of aminoplast and nitrocellulose. The paper should be 1 to

2
Contain 20 g of this mixture per m.

The base prepared in this way or with ethyl cellulose or with polystyrene can be coated with a Printing ink containing the virtyl resin and a finely divided pigment, which is advantageously coated with a vinyl resin, can be printed directly. However, it turns out to be useful

109838/0192

massive, the base first with an uncolored vinyl resin layer and then with one or more pigmented vinyl resin layers or with pigmented resins of others Composition j for example with acrylic resins !! to be printed. When using differently colored printing rollers, multi-colored motifs can be obtained *

The transfer of the peelable film from the temporary to the final support is preferred according to the principle of reverse coating, i.e. the one with the The temporary carrier provided with a removable film is coated with a solution containing the polyurethane resin crosslinkable components, in particular a mixture of a polyisocyanate and a high molecular weight hydroxyl group Polyester or polyether, coated. Then, expediently with the use of heat, the The solvent evaporates and the polyaddition takes place at the same time. The resulting polyurethane is with a Fabric, preferably a tricot fabric, laminated and the temporary carrier peeled off.

The decorations obtained in this way are distinguished by an excellent bond with the coating compound and accordingly by excellent adhesion, kinking and rubbing resistance. To increase the abrasion resistance and the resistance to solvents can be the application of an unpigmented protective lacquer, in particular

109838/0192

a polyurethane varnish, prove to be advantageous.

In the examples below, the parts mean, unless otherwise stated, parts by weight, the Percentages by weight and temperatures are given in degrees Celsius.

109838/0192

Example 1.

A transfer paper, the production of which is described below, is made in two squeegee applications with one Total layer of 0.85 mm of the following mixture coated:

100 parts of a 30% solution of a reactive polyester (registered trademark Impranil CHW) in ethyl acetate

5 parts of a 75% solution of a polyisocyanate (registered trademark Imprafix TH) in ethyl acetate

5 parts of a 10 ^ igen solution of a reaction accelerator (registered trademark Imprafix BE) in a mixture of ethyl acetate and ethylene chloride

4 parts of titanium dioxide (rutile type).

The coating is dried for 5 minutes at and with a tricot knitted fabric made of cotton concealed. After removing the transfer paper, a printed polyurethane coating is obtained. The print pattern After complete crosslinking of the coating components, it has excellent adhesion, scratch and rub resistance.

Manufacture of the transfer paper.

One prints one surface of a kraft paper

»·
one after the other with the varnishes of the following composition:

109838/0192

2103312

Paint No. 1.

21 parts of a urea-formaldehyde resin (registered Trade name Plastopal AT)

20 parts of nitrocellulose containing 11.4 $ N

2 parts octyl adipate
10 parts isopropyl alcohol
47 parts of methyl ethyl ketone

Paint No. 2.

15 parts of a copolymer of 85 $ vinyl chloride and 15 $ vinyl acetate (molecular weight approx. 9OOO)

85 parts of methyl ethyl ketone.

The print with varnish no. 1 (viscosity 30 see im Ford cup 4 min) is carried out using the gravure printing process with a screened engraving of 45 lines per cm, the printing of Paint No. 2 (viscosity 20 see in a Ford cup 4 mm) with a grid of 60 lines per cm,

After drying, one prints on the so prepared Surface with the help of differently colored printing rollers colored motifs, whereby the printing inks have the following composition:

$ 12 of a pigment preparation consisting of $ 50 a pigment and $ 50 from a $ 85 vinyl chloride copolymer and $ 15 vinyl acetate (molecular weight 9,000), $ 6 one Copolymers of $ 85 vinyl chloride and $ 15 vinyl acetate (Molecular weight 9000), 10 $ toluene and 72 $ methyl ethyl ketone.

After drying, the paper is ready for transfer printing. 109838/0192

- 8th - Example 2.

A transfer paper, the production of which in the preceding Example described is coated with the following mixture;

Parts of a solution of a reactive polyester (registered trademark Impranil CHW) in ethyl acetate

Parts of a 75% solution of a polyisocyanate (registered trademark Imprafix TH) in ethyl acetate

Parts of a 10% solution of a reaction accelerator (registered trademark Imprafix BE) in a mixture of ethyl acetate and ethylene chloride)

Parts of a pigment preparation consisting of 50 $ of a brown organic pigment and to 50 $ of a 85 $ copolymers of vinyl chloride and vinyl acetate 15 $

Parts of a pigment preparation consisting of $ 75 Titanium dioxide and a $ 25 copolymer from $ 85 vinyl chloride and $ 15 vinyl acetate

Parts methyl ethyl ketone.

After the coating has dried on, the

Transfer paper has a dry weight of 45 g / m 2. Man proceed as indicated in example 1. After removing the transfer paper, there is a printed brown polyurethane coating obtain.

109838/0192

Example 5

A transfer paper, the production of which is described in Example 1, is coated with the following mixture:

100 parts of a 30 $ ig ^e n solution of a reactive polyester (registered trademark Impranil CHW) in ethyl acetate

5 parts of a 75% solution of a polyisocyanate (registered trademark Imprafix TH) in ethyl acetate

5 parts of a 1 above solution of a reaction accelerator (registered trademark Imprafix BE) in a mixture of ethyl acetate and ethylene chloride

OjI parts of a red organic pigment 2 parts rutile-type titanium dioxide.

The coating is for 20 minutes at 25

ο dried, has a dry weight of 35 g / m and is lined with a tricot fabric made of polyamide fibers. After a further storage for one hour at 25 the transfer paper is removed. The printed light red coating obtained in this way has a wet film thickness of 0.01 mm painted with the following mixture:

25 parts of a solution of a reactive polyester (registered trademark Desmophen 800)

25 parts of a solution of a polyisocyanate (registered trademark Desmodur IL)

50 parts of methyl ethyl ketone.

The printed coating obtained by this process has, after complete curing, and Drying good resistance to dry cleaning.

109838/0192

Claims (1)

- ίο - Claims. Method of decorating polyurethane coatings, characterized in that the surface to be decorated with a provisional Carrier made of paper, aluminum or regenerated cellulose, containing a peelable film Vinyl resin and pigments and an underlying Bringing polystyrene / layer of ethyl cellulose / or a mixture of nitrocellulose and an aminoplast into contact and separating the temporary carrier from the final carrier. 2. The method according to claim 1, characterized in that that the temporary carrier provided with the peelable film with a solution containing the components crosslinkable to form a polyurethane resin, coated, the solvent preferably by using heat to evaporate, the polyurethane resin is laminated with a fabric and the temporary Carrier pulls off. 3 · Method according to claims 1 and 2, thereby characterized in that a film is used as the temporary support, the peelable film of which is made of polyvinyl chloride or a copolymer of vinyl chloride and 109838/0192 Vinyl acetate containing an image motif exists. 4. The method according to claims 1 and 2, characterized characterized in that the thickness of the peelable film is 0.5 to 10μ, 5. The method according to claims 1 to 4, characterized in that the peelable film 1 to 8θ $ contains a finely divided pigment. 6. The method according to claims 1, 2, 4 and 5 * characterized in that the peelable film consists of a layer of an uncolored polyvinyl chloride and an overlying layer of pigmented polyvinyl chloride or copolymers of vinyl chloride and vinyl acetate. 7. The method according to claims 1 to 6, thereby characterized in that the underlying layer is a mixture of nitrocellulose and a urea-formaldehyde resin contains. 8. The method according to claims 1 to 7 *, characterized in that the mixture consists of 4θ to 60% of nitrocellulose. 9 · Process according to claims 1, 2, 7 and 8, characterized in that the mixture additionally still contains an alkyd resin. 109838/0192 - 12 - IQ, method according to claims 1, 2, Y, 8 and 9. » characterized in that the film per m 1 to 20 g this mixture contains. 11. The method according to claims 1 to 10, characterized in that the decorated polyurethane coatings covered with a protective varnish. 12. The method according to claim 11, characterized in that the protective varnish is a solution containing the components that can be crosslinked to form polyurethanes are used. 109838/0192