DE2327386A1 - Peel-off film, method of making the same, and peel-off method - Google Patents

Description

George M. Whiley Limited,

Victoria Road,

Ruislip, Middlesex / England

"Release liner, method of making the same, and Peeling process "·

The present invention relates to release liners, which are also known as imprint foils.

So-called hot-press imprint foils are already known a carrier sheet with a layer of a release substance applied to its inner surface, a decal or pattern (in one or more layers) attached to the layer of the release fabric and an adhesive layer on the side of the image or the release material remote from the layer Have pattern layer (s).

To apply the release liner to the surface of an object, for example, a heated one is used Stamp placed with pressure on the known Warmpreßaufdruckfolie, which takes place during the application under pressure of the stamp is in a position opposite to the object to be marked or patterned. The simultaneous application of heat and pressure causes

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the activation of the release and adhesive layers and results in the release of the pattern layer (s) and firm adhesion of the adhesive layer and the pattern layer to the object. The carrier sheet is subsequently removed.

However, certain objects and materials are unsuitable for such a hot stripping process; included it is likely to be most metal and glass objects, many wooden objects and a wide variety of objects Trade products of a different type of manufacture, the size, shape or position of which is marked or denoted or Sampling according to the previous procedure or with the makes previous materials impracticable; such objects are, for example, parts or pieces of Household items or furniture of plastic or wood, components of buildings and motor vehicles.

In one aspect, the present invention provides a release liner which is comprised of a carrier sheet, a release layer on the carrier sheet, a release layer on the side of the release layer remote from the carrier sheet and consists of an adhesive layer which is located on the side of the remote from the release layer The release liner is located and becomes tacky after heating and remains tacky after being removed from the heat source and returns to its original temperature. \ ■.

The adhesive of this type, hereinafter referred to as adhesive with extended tack, hardens slowly after it is cooled to its original temperature, so that an application of heat to the Slide while it is in contact with an object

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is located on which the release layer is applied should be omitted. Adhesives with extended stickiness are used in adhesive technology also known as delayed tack adhesives.

Thus, the above-mentioned difficulties are overcome by means of a release liner, which is not a simultaneous one Requires application of heat and pressure while being in contact with the surface that is marking or to be sampled.

In another aspect, the present invention is a A release method for transferring the release liner of the release liner of the type described above to a substrate, this method being. consists, that the release liner is heated to make the adhesive tacky, whereupon the release liner is removed from the heat source removed and in the still tacky state of the adhesive is applied to the substrate under pressure, thus a firm bond between the release liner and the backing, whereupon the carrier sheet is removed and the release liner on the backing remains adherent. -

The peel-off layer of the peel-off film can (for example, with powder made of glossy or matt gold or glossy or Matt silver, bronze or aluminum, lacquered aluminum or real gold) metallized (for example red, blue or white) 'colored, (as wood grain or multicolored Pattern, which can be printed as desired or in register), patterned or from any other arbitrary Material to be transferred. In either case, however, the outermost layer is the

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Film away from the backing, an adhesive that becomes tacky when heated and that is used during a remains tacky for a long enough time after it has been removed from the heat source to be complete To enable the removal process to be carried out.

In a third aspect, the invention provides a method for producing the release liner of the type described above, this process consisting in that a carrier sheet with a layer of release material and the release layer with at least one Provided a layer of release material and then provided the adhesive with time-extended tack will.

The release material or the material to be transferred can, for example, be a layer of a lacquer or a pigmented one Have composition or mass. If lacquer is provided, the material to be transferred can comprise a pattern layer or a layer of vacuum deposited metal.

The metal and pattern layer need not cover the whole area of the carrier sheet.

A possible manufacturing process can be carried out in the following stages:

(1) A carrier material, such as. B. Glassine, regenerated cellulose or polyester comes with a release layer overdrawn;

(2) The release layer is coated with a varnish or a color or printing ink or a pigmented one Composition or a pigment mass or a

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coated with another substance to be transferred;

'(3) If a lacquer is used, then if necessary metallized or a pattern printed;

(4-) an intermediate adhesive coating or adhesive coating is optionally applied to set the transferred layers; and

(5) the material is coated with the extended tack adhesive, taking care must be that it is dried with air below its activation temperature.

To better understand the present invention and to illustrate the manner in which it can now be carried out on the attached Reference drawing for example; show in it:

1 shows a cross section through a metallized release liner with extended tack;

Figure 2 is a cross-section through a pigmented release liner with extended tack; and

3 shows a cross section through a multi-colored peel-off film with extended tack.

Referring first to FIG. 1, this figure shows a Foil .with a carrier sheet 1, which is on the same side successively with a release layer 2, one Lacquer layer 3> a layer of vacuum-deposited metal 4 ·, an intermediate adhesive layer 5 and -a layer

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of adhesive 6 is coated with extended tack. '

Fig. 2 shows a film with a carrier sheet 11, which on the same side successively with a release layer 12, a layer of pigment 13 and one Layer of adhesive 14 with extended tack is covered.

Fig. 3 shows a foil with a backing sheet 21, which successively with a free-reproduction layer on the same side 22, a printed register in multi-color layer 23 and a layer of adhesive 24 · is coated with prolonged tack.

The present invention will now be explained on the basis of the following examples.

example 1

A roll of conventional polyethylene terephthalate film measuring 50 was coated on a gravure printing press with a solution of an ester wax dissolved in trichlorethylene, resulting in a dry coating weight of approximately
coating.

approximately 1 g / m 2. The ester wax acts as a release

The dried film was then given the various forms shown in Figure 1 of the accompanying drawings Layers 3-6 coated in the following order:

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(a) Lacquer layer (3 ) Per ζ cent nitrocellulose 12%

60% / 40% butyl / methyl methacrylate copolymer 15 %

spirituslöSucher ore dye

(Azo dye, chromium complex) 5%

Cyclohexanone 33%

Isopropanol 25%

Ethyl acetate 10%

. The solution was made using an engraving press applied, with a dry coating weight of approximately 1.5 g / m 2.

(b) metal layer (4)

A film of aluminum was applied by vacuum deposition, with a glossy coating being a Thickness - approximately 15 millimicrons (i.e. 15 x 10 "'cm) was obtained.

(c) intermediate adhesive layer (5)

Using one of the for the paint application (a) The device similar to the printer used was the following adhesive compound in a

2 Coating weight of approximately 1.5 g / m applied:

Weight brittle polyvinyl butyral. 4 %

Polyvinyl acetate

(Viscosity grade 2.5) 6 %

industrial methylated alcohol 80% water '10 %

3 09-8 507 09 58 '■ "■

(d) Adhesive layer with extended stickiness over time (6)

An adhesive with extended stickiness, which was composed as below, then using the same printer device with sufficient Warm air circulation to remove the residual water below Maintaining the temperature of the "coating below." its activation temperature of 70 ° C applied:

Weight percent

Polyvinyl acetate emulsion 50 %

partially dimerized resin 20 %

Dicyclohexyl phthalate 10%

Water ■. 20 %

A piece of release liner made as described above had been, was in contact with an electrically heated plate underneath with the polyester support Maintaining a temperature of the plate of 80 ° C for a period of two seconds. Through this the glue became sticky. The film was then removed from the heat source, whereupon the sticky Adhesive surface under pressure with the help of a rubber squeeze roller brought into plant with various objects made of wood, glass or plastic became. The colored and metallic layers were successfully transferred.

The open time of the above-mentioned adhesive was approximately 5 hours during which the adhesive was tacky and thus remained pressure-sensitive. By adjusting the formulation, it was found that this Period of time can be varied significantly to accommodate different surfaces and circumstances. For a typical adhesive with an open time of

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60 % 15th % 5 % 20th %

about 2 hours the following formulation was used:

Weight percent

Polyvinyl acetate emulsion partially dimerized resin Pest phthalate plasticizer water '

Example 2

A roll of glassine paper was made with a wax solution using a conventional waltz coating machine overdrawn.

The role was thereupon with. coated with a pigmented layer, which has the following composition in percent by weight had: - *

25% microcellulose solution in acetone 12 %

25% tritolyl phosphate solution in acetone 12 %

Blue pigment 52 %

methylated industrial spirit 12%

Acetone 12%

Finally, a coating of extended tack adhesive was applied to the composition in percent by weight was as follows:

Neoprene emulsion 50% chlorinated paraffinic

Hydrocarbon 15%

Acrylic copolymer. . 15 %

industrial methylated alcohol 20%

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The film obtained in this way was then applied to various surfaces in the manner described in Example 1 applied with satisfactory results.

The various layers can cover the total area of the carrier sheet depending on the sampling requirements the release liner and manufacturing process, and of the application to be used or not.

The formulation and "open time" of the adhesive with extended tack can vary depending on the intended use the release liner can be changed. So are . for example "open times" in the range from 0.5 min. to planned for several hours.

Claims

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Claims (3)

Patent claims 1. Release liner consisting of a carrier sheet, a release layer on top of the carrier sheet, a release liner on the side of the remote from the carrier sheet Release layer and a layer of an adhesive on the side remote from the release layer the peel layer, characterized in that the adhesive (6, 14, 24) can become tacky, when -it is heated and that it remains sticky after being removed from the heat source and its temperature is restored to its original value. 2. peel-off film according to claim 1, characterized in that that the peel layer has one or more metal, Contains pigment and pattern layers. 5. The method of making a release liner according to claim 1, wherein a carrier sheet having a layer of a release material, the release layer with at least one layer of material to be transferred provided and then an adhesive is applied to the material to be transferred, characterized in that that the applied adhesive may become tacky when heated and remain tacky after he removed from the Yförme spring and his temperature on. their original height is returned. "4. A method for transferring the transferable layer or the release layer of a release liner according to claim 1, wherein the release liner is heated so that 3U38SO7U95'8 the adhesive becomes sticky, whereupon the release liner is applied to the backing under pressure thus to cause a firm adhesion between the release layer and the backing, whereupon the carrier sheet is removed and the peel-off layer remains adhering to the base, characterized in that that after heating the release liner the same removed from the heat source and then on the Underlay is attached while the adhesive of the release liner removed in this way is still tacky is. 5 · Backing with a peel-off layer glued to it according to the method according to claim 4-. 3 ti ¹ J Ή D UI UH b H