DE2260222A1 - ADHESIVE TRANSFER TAPE - Google Patents

Description

DR. MÜLLER-BORß DIPL-PHYS. DR. MANITZ DIPL-CHEM. DR, DEUFEL

DIPL-ING. FINSTERWALD DIPL-ING. GRÄMKOW _n

PATENT Attorneys £ 4 O U £ 4 4

_Tr . ^ _Λ -β. Dec, 1972

Hunchen, the Lo / Sv - E 1089

EVODE LIMiDED

Goiffflion Eoad, Stafford, England

Adhesive transfer tape

Priority: Great Britain of December 8, 1971, No. 56992/7 <l

The invention relates to an adhesive transfer tape whichever pressure sensitive adhesives or contact adhesives be presented in a manner suitable for the application.

Possess pressure sensitive adhesives or contact adhesives the advantage of not being activated by heat or a solvent or mixing of reactive components require prior to use and that a satisfactory bond for many purposes immediately when the adhesive is brought into contact with the surfaces to be united.

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Typically, pressure sensitive adhesives in the form of a solution or emulsion on one of a i ^l 'ußbodenplatte each other to "mating surfaces, for example, or a decorative loading: applied coating, and the liquid phase of the adhesive has to before the pressing of the plate or of the coating in contact Often, however, the application of the adhesive, especially by inexperienced users, is considered to be a difficult and messy operation, and often too much adhesive is used with the result that when the adhesive pressure is applied The surfaces to be joined are squeezed out of the excess adhesive and the appearance of the bond is impaired.

The object of the invention is to avoid these disadvantages.

According to the invention, this is achieved by means of an adhesive transfer tape enables a carrier film with a releasing surface and a discontinuous coating a pressure sensitive adhesive or pressure sensitive adhesive on said releasing surface, said adhesive is arranged as an arrangement of discrete surfaces, which from the carrier film on a non-releasing surface can be transferred to the adhesive areas by pressing this non-releasing surface under pressure, and wherein the non-releasing surface is removed from the carrier film.

Usually it is only necessary to use the non-releasing one Surface, e.g. a plate or a decorative coating with light pressure on the adhesive on the carrier film hang up.

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The adhesive transfer tapes according to the invention normally have the I ¹ OrBi of a carrier film, which has a releasing surface and an arrangement of discrete discs or button-like points of pressure-sensitive adhesive / - although other shapes are also possible, e.g. rectangles, trapezoids or ribbon-like arrangements. The adhesive patches or areas need not be uniform in size and shape, although this is easier to manufacture.

The transfer; of adhesive to a surface to be glued is easy to carry out according to the invention. If For example, if a plate or tile is to be glued to a wall, the rear surface of the Slightly slab or tile onto the adhesive buttons on the Träiip? pressed foil. When the plate or tile is lifted from the foil the adhesive buttons come off the carrier film in the area covered by the plate, the adhesive remaining on the carrier film in other areas. The slab or tile having the correct amount of glue spread over its surface, then becomes pressed against the wall surface, achieving a good bond with a clean appearance ■ More tiles or panels can be coated with adhesive in a similar manner by attaching them to other areas of the carrier film are pressed so that ultimately all of the adhesive on the carrier film is used. It should be noted that involved molded objects can be coated very precisely with the correct amount of adhesive in a simple manner and quickly can without any special skill required.

It should also be pointed out that it is not possible to clean the adhesive from the releasing surface transferred, if the adhesive is not arranged as an arrangement or a cough. · τ / ο., discrete surface areas, since The adhesion of the adhesive would cause a large

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Amount of glue outside the surface of the plate from the Carrier film would be peeled off.

Of course, the pattern of arrangement and the size and thickness of the adhesive buttons will depend on the intended end use. For example, it should be stated that a suitable pattern for gluing sheets of paper can consist of adhesive ^disks about 2 minutes in diameter and about 0.025 in thickness, which are distributed uniformly over the carrier film with center-to-center spacings of 5 1Dm. For applications with more stringent requirements, such as bonding ceramic wall tiles, it may be necessary to use thicker areas of adhesive that are deposited in higher density on the carrier film.

So that the adhesive transfer tapes of the invention are stored and can be transported, the adhesive should be covered with a protective film, the releasing Has properties. This can either be done by using interlayer films which have releasing surfaces or by providing a carrier film with different release properties on both of its surfaces can be achieved. To properly release or separate the adhesive transfer tape from a roll or stack To ensure during application, the surface carrying the adhesive areas should have slightly weaker release properties or have release properties than the opposite surface. This can be achieved, for example, by the back of the carrier film with a larger amount of a release agent, for example with a silicone material as the surface to be coated with the pressure-sensitive adhesive. Alternatively, a polymer film, e.g. made of polyethylene, which has inherent release properties, or a polymer / paper laminate with a Release agent such as a silicone preparation on a surface be coated to create a carrier film, which

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has different separation properties. In practice, the use of a carrier film has proven to be very satisfactory highlighted the different separation properties in the ratio of 2.5 ί 1 possesses. The side carrying the adhesive buttons has the slightly higher one Affinity for the adhesive. This ratio is by measuring the adhesion of a standard amount of pressure sensitive adhesive calculated on each side of the carrier film.

The adhesive can be applied to the backing film in a number of ways applied by working methods, including the following?

1. Spray the adhesive with or without a template;

2. Roller coating using a template;

3. Whale coating using an engraved or etched roller;

4. Roller coating using a raised one or embossed roller;

5. screen printing;

6. Use of nozzles fed under pressure, which apply discrete spots or buttons of adhesive to the carrier film to distribute.

A roll coating method is currently being used a perforated roller in which the adhesive is fed into and out of the interior of a perforated drum the drum is dosed out onto the carrier film by means of a doctor blade. This working method will be explained in detail later explained below.

The pressure sensitive adhesive or contact adhesive should be like this be that he his physical form under KOrmal conditions, which are likely to occur during handling and storage. Pressure sensitive adhesives, which

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creep or flow are not satisfactory for the application according to the invention.

Preferred pressure sensitive adhesive materials are such based on acrylic or methacrylic monomers. Satisfy The adhesives can be made, for example, from monomeric acrylic esters of the following general formula:

OH ₂ -GHCOOR

where R is an alkyl radical of the general formula G-rfiCPn + i) ^{and n is} an integer from 1 to 12. Pressure-sensitive homopolymers can be prepared from monomers in which η is 4 to 12 and in particular from 4 to 8.

Pressure-sensitive copolymers of these esters can be produced in which η has the value 1 to 12.

Suitable pressure-sensitive adhesives or contact adhesives can also be made from homopolymers or copolymers made of methacrylic esters of the following general formula will:

CH ₀ -CCOOR

_n wherein R is an alkyl radical of the formula O _n HfP ₊ I ^ ^ ¹¹¹ ^ ⁿ ^ ^bit 12 are

Copolymers of acrylic esters with methacrylic esters can also be used to create contact adhesives which can be used according to the invention. In addition, ILi achpolynieri sates of acrylic and / or methacrylic esters can be produced by using three or more monomers :, for the production of pressure-sensitive copolymers; will. Advantageously, the pressure-sensitive acrylic or Mefchacrylesber polymers contain no more than 20 ^L , i> Gomonoüiero'i and preferably the comonomer in an amount of 0.1 to

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10 % of the polymer weight used. The Gomonomere is added to modify the properties of the polymer, for example to facilitate the crosslinking of the resulting hats and thereby increase their cohesive strength and reduce the tendency of the adhesive to creep or flow .. The following Oonionomere are for copolymerization with acrylic or Methacrylic esters suitable: Acrylic acid, methacrylic acid, acrylonitrile, glycidyl methacrylate, hydroxyethyl ethacrylate, hydroxypropyl methacrylate, ethylene glycol dimethacrylate, propylene glycol dimethacrylate, trimethylolpropane trimethacrylate, butylaminoethyl methacrylate, methacrylate, methacrylate, methacrylate, methacrylate, methacrylate, methacrylate, methacrylate, butylaminoethyl, vinyl acrylate, butylaminoethyl, vinyl acrylate, vinyl ethylac The polymers can be prepared by polymerizing the monomers in organic solvents such as ethyl acetate, hexane and toluene or in mixtures of organic solvents according to known solvent polymerization procedures. Alternatively, the polymerization can be carried out in emulsion using suitable surfactants and the usual redox catalysts and modifiers. It should be pointed out that the physical properties and the tackiness of the resulting polymers depend to a certain extent on the molecular weight of the polymer. The extent of polymerization must therefore be controlled so that the resulting polymer has sufficient cohesion and integrity to maintain its physical shape when poured onto a support, but the polymerization has not progressed so far that the polymer does not become superficially tacky has more.

The properties of the resulting polymer can be modified in order to increase the desired properties, • <l.ü. to increase viscosity or surface tack.

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Other types of pressure sensitive adhesives or contact adhesives can be used in the manufacture of the adhesive transfer tapes according to the invention are used including rubber / resin mixtures, in which the rubber is of natural or synthetic origin and with natural or synthetic Resins to form a sticky material. Suitable adhesives can also be applied to polyvinyl ether resins be constructed.

The pressure-sensitive adhesive is suitably applied to the Carrier film deposited from solution in an organic solvent or from an emulsion and then the liquid Phase removed by evaporation. According to the invention, however, it is also possible to use the adhesive in the form of a heated one To deposit melt which, when cooled, retains a sufficient degree of flexibility and surface tack.

For certain applications it is possible and advantageous to have two or to deposit more types of pressure sensitive material on a single carrier sheet. So can one type of glue for gluing paper to paper, while another is used to sue sheets of plastic Material is formulated on wood or other surfaces. By pressing the desired object to be glued into Contact with the carrier film is transmitted through either type of pressure-sensitive adhesive or contact adhesive However, if the different types of adhesive penetrate uniformly across the film, the adhesive will be sufficient desired type transferred to the object to be glued.

The production of the adhesive tape according to the invention is explained in more detail with reference to the drawing, are in the drawing

Fig. 1 is a side elevation of a schematic view of an apparatus for coating the carrier film j

FIG. 2 shows an overview of the carrier film obtained. Fi £. ;> a double layer of an adhesive tape over {-; un [jsbanäi; r ·. J, i.J- ί. AL-QCCl-Iu-I ^ -U.

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In Fig. 1 is a nickel-plated drum of about 30.5 cm diameter shown in the by the arrow displayed sighting can be rotated. The cylinder i "owns a perforated cylinder wall, the perforations being suitable for the size and distribution of the adhesive areas, which are to be deposited on the carrier film, are dimensioned and arranged in terms of their size. A carrier film 2 will get in touch with. of the roller or cylinder 1, and around the portion of the circumference of the cylinder 1 by means of ! Bore sw al en 3 and 4 guided. Contact adhesive as a solution or Emulsion is dispensed from a tube 5, which is axially * extends to the cylinder 1 and has openings, whereby the adhesive in the form of a curtain on the inner wall of the Cylinder 1 can be deposited 1 guided to a doctor blade 6, which the amount of adhesive passing from the cylinder 1 through the perforations in its wall regulates. After the coating stage, the carrier film 2 is passed through a tunnel drying oven in which the liquid Phase of the adhesive is removed.

Fig. 2 is a plan view of a carrier film / after coating with the glue. As can be seen from this figure, the carrier film, which is a thick one, carries on both sides A sheet of paper coated with silicone release agent is an array of circular areas on one surface thereof of pressure sensitive adhesive 7 * ^ β * 3 shows a Similar tape to FIG. 2, but with protective film 8 as a cover. The invention is explained in more detail below with the aid of examples:

example 1

98 parts by weight of an aqueous emulsion with 50 % solids content, which contains an oil polymer of 2-ethylhexyl acrylate and acrylonitrile, were mixed with 2 parts by weight of an aqueous

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to

gen polyacrylic acid emulsion with 17 % solids content. The copolymer emulsion is commercially available under the trade name Revert ex 2030 from HiLRCO Limited, Harlow, Essex, while the polyacrylic acid emulsion can be obtained from the same company under the trade name Revacryl A191. The mixed emulsions were adjusted to a pH of 7-5 with 0.880 ammonia and poured onto a carrier film, which comprised a layered body of paper and polyethylene, by means of conventional screen printing. The adhesive was poured onto the polyethylene side, the paper having been previously coated with a silicone release agent so that it had better release properties or release properties compared to the polyethylene. The adhesive was deposited in discs 2 mm in diameter and 0.0125 mm thick with center-to-center distances of 5 mm. The resulting coated carrier was heated to drive off the water, and the resulting product was cut into small sheets and stacked in layers.

Example 2

20 parts by weight of a butadiene-styrene rubber (trade name Polysar S.1006 from Polysar (UK) Limited) were dissolved in 60 parts by weight of a hydrocarbon solvent with a boiling point range of 140 ° to 162 ⁰ O (trade name SBP 60 from Esso Chemicals Limited) together with 20 parts by weight of a rosin ester ( Collophonium resin ester, trade name Stabelite Ester 10 from Hercules Powder Company) The resulting solution was deposited onto the polyethylene / paper laminate described in Example 1 using the device described in Fig. 1. The adhesive was in the form of disks with a diameter of 2.5 mm and 0.048 mm thick with 6 mm center-to-center spacings.

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Example 3 - ■

A mixture of Polyvinjläthernj which 10 parts by weight of highly viscous polyvinyl! Sobutyl ether in 80% gasoline solution (trade name Lutonal J ₀ 60 from BASF (uJ _o ) Ltd _o ) and 20 parts by weight of another polyvinyl ether (trade name Lutonal 1GE 125. From BASF (U ₀ K ₀ ) Ltd.) _s were of the same _s dissolved in 70 parts by weight in example 2 applied hydrocarbon solvent. The resulting solution was deposited by means of a pressure roller on the polyethylene / paper laminate described in Example 1 in the form of disks with a diameter of 3 mm and a thickness of 0.25 mm with center-to-center distances of 7 nm. The coated laminate was passed through a drying tunnel to remove the solvent, then the product was wound up ^{in the form of a sleeve 1 «,}

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Claims (4)

Claims 1. Adhesive transfer tape, characterized in that it is a carrier film with a releasing surface and a discontinuous coating of pressure sensitive adhesive on said releasing surface comprising, wherein the adhesive is arranged in the form of an array of discrete surface areas, which is defined by the Carrier film on a non-releasing surface by applying the non-releasing surface under pressure on the adhesive surface areas and removing the not releasing surface are transferable. 2. Adhesive transfer tape according to claim 1, characterized in that the surfaces of the carrier film have different release properties, the adhesive. less tendency to stick to the back Has the surface of the carrier film than the front surface. 3. Adhesive transfer tape according to claim 1 or 2, characterized characterized in that the pressure-sensitive adhesive based on a polymer of an acrylic or Methacrylester is built up. 4. Process for the adhesive connection of two surfaces, characterized in that on · one of the surfaces to be united an adhesive transfer tape according to one of claims 1 to 3 under light pressure is applied, which has an adhesive coating in the form of discrete Surface areas bearing surface is removed and the adhesive-coated object firmly in contact is pressed with the other surface to be united with it. - 12 - 309 ^ 25/1051 Blank page