DE2344120A1 - RELEASABLE COVER FOR PRESSURE SENSITIVE ADHESIVE - Google Patents

Description

Dr.-Ing. HANS RUSCHKE
Dipl.-ing. OLAF RUSCHKE
Dipl.-ing. HANS E. RUSCHKE

1 BERLIN 33

65

Ardis II. Lavender, Mines, Illinois, V.St.A.

Removable cover for pressure sensitive adhesive

The invention relates to a removable cover for water-insoluble, pressure-sensitive adhesive and in particular a water-soluble or water-binding or water-absorbent peelable coating and methods of applying the coating and the articles made thereby ·

Ea gives a class of adhesives suitable for industry, known as pressure sensitive adhesives or contact adhesives. The invention relates to water-insoluble, pressure sensitive adhesives or contact adhesives. Although the contact adhesives on the market are very extensive can be modified to thereby change their adhesive properties, the invention relates to the entire field of water-insoluble, pressure-sensitive substances, which include, for example, the following: silicone resin and rubber adhesives, Polyurethane adhesives, short acrylic adhesives, various modified acrylic resin adhesives and contact

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rubber-based fabrics. Although the class of adhesives listed above in terms of chemical composition can vary considerably, all these adhesives are associated with the same problems, which are eliminated according to the invention should be.

Whenever possible, the contact adhesives are applied to a base in the form of a thin film by the main manufacturer of, for example, adhesive strips, self-adhesive tiles or bricks or, for example, the manufacturers of decals. The adhesive film is then protected by a releasable film or liner to which the adhesive will not adhere. Many contact adhesives have adhesive properties that are so good that without major modification of the adhesive to reduce the adhesive strength of the adhesive there is no peelable coating that could be used for it. Another problem associated with contact adhesives of the cited Klaa- £ & is that, after they have been applied to a substrate, they immediately adhere to any surface with which they come into contact, so that the relevant Surface cannot be removed and returned to its place. This latter problem is particularly troublesome when laying floor tiles or, for example, plastic desk tops or other plastic coverings for furniture or room furnishings.

According to the invention there is a removable cover for wasaexnin— soluble, pressure sensitive adhesives or contact adhesives has been found that sticks firmly to the adhesive and thereby represents a non-adhesive surface, so that otreifen and the like can be transported in the commercial sector, without any difficulties, the At the same time, however, the coating can easily be removed without the sticky characteristics of the water-insoluble, pressure-sensitive Adhesive permanently: or permanently changed.

409811/1105

Berner allows the use of the invention that a lint would result placed on the adhesive and then easily folded into position without affecting the adhesive strength of the final Bond between the backing and the adhesive is adversely affected. According to the invention it has been found that a removable coating, which consists of a water-soluble or a water-binding or water-absorbing material and in the form of a particle or in the form of a particulate Material is applied, fell to those specified above and Results.

The object of the invention is illustrated in the accompanying drawings and further explained in the following examples.

In the drawings is

FIG. 1 is a schematic representation of a fabrication product, one pad, a water-insoluble, pressure-sensitive adhesive and one contains removable cover for this,

FIG. 2 is a schematic representation of an object, in which the base is a network or fabric that is the water-insoluble, pressure-sensitive Adhesive on the two opposing surfaces and contains removable coatings that cover the cover both adhesive surfaces, and

Figure 5 is a schematic representation of a base with a label on one side and a water-insoluble, pressure-sensitive adhesive on the other hand, with a detachable Ifber-ZUg with the same extent as the surface area of the adhesive is pre-bonded.

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As stated above, there are a variety of water-insoluble » pressure sensitive adhesives in the form of special commercial items. Each of these numerous special masses or Article has slightly different adhesive properties and is therefore sticky or sticky to different substrates. In general, a major part of the currently available sticks water-insoluble, pressure-sensitive adhesives on a wide variety of substrates including metal, wood, Include paper, cloth, synthetic organic resins, and numerous combinations thereof. Regardless of the special Adhesive properties of the individual articles of commerce, the removable coatings according to the invention are effective when the adhesives are themselves insoluble in water.

In FIG. 1 of the drawing, a manufactured product 1o is shown which contains a base 11 with an upper surface 12 and a rear surface 13. A water-insoluble, pressure-sensitive adhesive 14 is applied to at least a portion of the top surface 12 of the backing 11. The adhesive 14 has been dried by a "solvent, because most of the commercially available adhesives are in an organic solvent such as xylene, toluene or the like." After the solvent has been removed, a removable cover 15 with an inner Surface 16 and an outer surface 1? applied to the substrate 11 with the adhesive 14 thereon. The releasable liner 15 has a sufficiently large surface area that it completely covers the free surface area of the adhesive 14 in such a way that the inner surface 16 of the releasable liner 15 rests on and is firmly bonded to the adhesive 14. The peelable cover 15 is so tightly bonded to the backing 11 by the adhesive 14 that the peelable cover cannot be removed without destroying the nature of the adhesive or destroying the backing 11 or the peelable cover itself. By applying aasser by washing it off

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with a sponge or the like. the outer or free surface 17 of the removable cover 15 is, however, bewix'kt that daii the removable cover in the case of a water-absorbent one Material swells and can easily be peeled off from the adhesive or, in the case of a water-soluble material, dissolves in the water and leaves the free surface of the adhesive. When the peelable coating 15 is removed, it remains a small amount of water on the free surface of the adhesive 14 · back, which, however, does not affect the chemical properties of the adhesive changes or the binding power of the same permanently affected, and it is now possible that a Substrate is brought into contact with the adhesive without this sticks immovably to this, and in a suitable Position is placed in relation to the adhesive until the water evaporates and the adhesive becomes a permanent bond trains. After the evaporation of the water between the adhesive and the substrate brought into contact with it the bond formed between the adhesive and the substrate is as strong as if no water was initially present were. The base 11 of the article 1o can be any Be the substrate to which the adhesive 14 adheres. For example The underlay can consist of floor tiles, wallpaper paper, foil for an adhesive strip, a component of a composite Assembly or apparatus or any other material that is glued to another material and like a synthetic organic resin strip bonded to a substrate shall be.

FIG. 2 shows a product of manufacture 2o with a base 21 in the form of a plastic network or fabric shown. A water-insoluble, pressure-sensitive adhesive 24 is applied to the network 21 and fills it Gaps out. Two removable covers 2p of the above Type are applied to the surfaces of the adhesive 24- after which the adhesive was removed from the solvent

0 9 8 1 1/1 1 0 S BAD

- ο -

freed by drying; has been. Each peelable cover 25 has an inner surface 26 in contact with the adhesive 24 and an outer surface 27. The peelable cover 25 are each firmly bonded to the respective surface of the adhesive 24. The product of manufacture 2o is particularly useful “when two surfaces are to be joined, but it is inconvenient or unsuitable to use an adhesive in the form usually available on the market. The product 2o as well as the article 1o described above can easily be transported in the industrial sector without "the risk of the adhesive 24 sticking to undesired substrates or the adhesive properties of the adhesive being significantly impaired. If water on the free surface 27 is applied from one of the release coatings 25, the coating absorbs the water or dissolves in the water, thereby allowing the release coating to be removed either by peeling or dissolving in the water, thereby leaving a surface area of the adhesive The removal of one peelable coating 25 has no effect on the condition of the other peelable coating 2.51 because the adhesive 24 is water-insoluble and that water does not pass from one side of the base 21 to the other side. It is also advantageous to use the structure described above without using any backing and only providing an adhesive layer between two removable covers.

In the figure 3 an object $ o is shown, which is a base 31 with a top surface 32 and a rear Has surface 33 and in which the upper surface 32 has the marking 34 carries, at least one adhesive 34 covers Part of the rear flax 35 of the pad 3'i, the Adhesive is a water-insoluble, pressure-sensitive adhesive. On the adhesive 35 is after the adhesive from the Solvent has been freed by drying, a removable

409811/1105 ORIGINAL BATHROOM

Coating with an inner surface 37 and an outer surface 38 has been applied, the inner surface 37 being in Contact with the adhesive 35 is located and firmly attached to this adhesive is bound. Once desired, the outer surface 38 of the release liner 36 can be wetted with water thereby detaching the peelable coating from the adhesive and, as indicated above, the adhesive 35 so fx ^ eileg-u, that it can be adhered to any desired substrate. The adhesive can be used to create a transfer image cover.

As is indicated below for exemplary explanation, the base can be made of metal, wood, synthetic organic Resin sheets, sheets or films. Paper, cloth or any other material on which the as an article of commerce available glue sticks. As shown in the examples are in favor of the invention numerous adhesives listed as commercial items are suitable, the only requirement being that the adhesive be water-insoluble and is pressure sensitive. In addition, it is shown in the examples that the removable coating with a conversion according to Invention can be a film that is water soluble or water absorbed, can be paper that is water soluble or absorbs water, or made of a particulate material which is applied to the free surface area of the adhesive, provided that the particulate material is water-soluble is or absorbed by water.

The manufacturing products according to the invention and the product according to the invention Process for producing the same is explained in more detail in the following examples.

Example i
An aluminum strip with a size of 15.2 χ 6.4 χ ο.3 cm

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was cleaned. A water-insoluble, pressure-sensitive adhesive sold by General Electric under the tradename OR-5> 29 was obtained on the surface of the Brushed aluminum strip. The glue is üii-pciy a silicone resin and rubber adhesive. The aluminum strip with the adhesive on it was attached to the Air dried to remove the solvent from the latter remove. After the solvent had evaporated from the adhesive, a strip of regenerated cellulose was covered with a Size 15.2 χ 6.4 cm applied to the adhesive. the regenerated cellulose was firmly bound to the adhesive and the aluminum strip and could be used without destroying the regenerated Cellulose cannot be removed. 4 hours after the regenerated cellulose has been bonded to the adhesive was, the free surface of the regenerated cellulose was moistened with water, thereby the regenerated cellulose swelled slightly. The regenerated cellulose strip was then lightly peeled from the adhesive, leaving a free one There was a layer of adhesive that was sticky to the touch and had a thin film of water. The aluminum strip with the sticky adhesive on it was then applied to an identical aluminum strip with a size of 15.2 6.4 χ 0.5 cm. First were the two aluminum strips Moved somewhat with respect to each other, but after the water had evaporated the two aluminum strips were tightly bound together. The bond strength between the two aluminum strips was determined by applying a tensile force tested against the two aluminum strips and found that the dead strips are not separated by hand could.

The adhesive βR-529 from General Electric has a content of Feet substances of 10% by weight, a specific gravity at 25 ° C. of 1.0, a light straw-like color, a viscosity at 25 ° C. in the range of about 1000 to> ooo cP and. an i ^l lamb

409811/1105 BADORtGiNnL

_ Ot _

point of 4.4 ^0C .

The regenerated cellulose used in this example was available from HuPont Company under the trade name Cellophane I50PD received.

Example 2

A strip of cellophane I50PD: from BuPont with one size of 15) 2 6.4 cm was used as a base material instead of the in the example 1 used aluminum.

A water-insoluble, silicone-based pressure-sensitive adhesive SR-505 (from General Electric) was applied along 5 bands from the 4 hands of the cellophane strip. The strip with the adhesive thereon was air dried to remove the solvent therefrom. After being allowed to air dry, a second cellophane strip 15 »2 by 6.4 cm was placed in registration with the first gellophane strip and in contact with that first cellophane strip and the adhesive carried by it. The two cellophane strips were rolled flat; and the material was cured over Kacht in a Ufen, which was maintained at a l-emperature of 49 ⁰ O if the cellophane tape closest iag from the oven have been removed, the glue was dry, and it was anmöglich, the two cellophane tape without destroying them, separating them from one another. The cellophane tape placed after the adhesive was air dried was moistened with water and then easily peeled from the original cellophane tape, leaving an adhesive on the latter in a sticky, rubbery state. The cellophane strip with the adhesive on it was applied to a steel band and was firmly attached to it.

^409811/1105 ORIGINAL BATHROOM

-lotfeil dor adhesive one, i ^<thin: ilm had to ier free on surface, it was quite possible the steel strip after an initial contact between the otahlband and de.m adhesive had taken place, bring su in the appropriate position. Was after the steel strip has been placed in the appropriate position, and the V / ater of- the surface of the adhesive evaporates, there was a strong bond between the steel strip and ^T em cellophane tape, which could not be achieved without destroying the CEI loprins.

The silicone adhesive SR-585 from General Electric has a solids content of 55 wt .- ^, a specific gravity at 25 ° C of o.99, a light straw-like color, a viscosity at 25 ° C in the range of 1,000 to 8,000 cP and a flash point of 4.4 ⁰ C.

example

Using Bis Backing polyester film sold under the trademark Mylar and a General Electric silicone base adhesive SBr-516, the above examples were repeated using the following materials as release coatings for the adhesive. In all cases the adhesive was freed of solvent by drying before the peelable coating was applied, and particulate matter such as table salt, sodium bicarbonate, polyvinyl alcohol powder, polyvinylpyrrolidine powder, hydroxyethyl cellulose powder and cornstarch powder were used as the peelable coatings in place of the regenerated cellulose used in the above examples . Each of the above powders was effective as a peelable coating, and each coating adhered to the adhesive feet, leaving a non-tacky surface area that was easy to handle and could easily be removed from the adhesive by application.

0 9 8 11/110 5 ORIGINAL BATHROOM

gen of water could be removed, one weakly wetted Adhesive surface remained, which was slightly attached to aluminum, Steel and methyl acrylate stuck, as well as to decorative laminate made of phenolic resin-impregnated filler sheets and Wrapper leaves on the basis of Heiamine (Formica).

In addition, various other materials such as normal gelatin, toilet paper, woven cotton cloth and non-woven cloth have been used Cotton fabric sold by Chicopee Hills, each tested as a removable cover, and each of these materials worked in the same way as described above.

A number of tables are given below which explain further examples in which the adhesives have been applied to different substrates, the adhesive has then been freed from the solvent by drying and a removable coating has been applied to it. In each case, the release liner was firmly attached to the adhesive and could not be removed. After wet application of the release coating, it was easily removed from the adhesive, leaving a sticky, rubber-like surface with a thin film of water on it, the _| allowed the adhesive to be brought into contact with a substrate and slightly repositioned with respect to the substrate before the water evaporated. Once the water evaporated from the surface of the adhesive, a strong bond was formed between the substrate and the adhesive.

The adhesives used were General Electric silicone resin adhesives SH-516, SE-529 and SR-585. It was also an ol liconharz, sold by Dow Chemical Company under the designation I stay at the X-'ö-o ^ t j), used in ^ xiontaktklebstoff rubber-based, sold by Wilholdt Glues, Inc. at

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23A4120

the trade name 2A1128, and a Krcton-Kontaktkleb- material y sold by Minnesota Mining and hanu.facturing Company, under the trade name 4695, respectively have been tested and used in the following examples.

In the cases given in the tables below, the adhesive films were applied to substrates, dried in the air overnight and ? Hinuten dried in an oven at 49 ^Q G. A cellophane film (DuPont FDI50) was placed on the adhesive and firmly adhered to it. The next day the gellophane was moistened with water and stripped from the adhesive, leaving a sticky surface. The base with the adhesive on it was then brought into contact with various other substrates and adhered to these substrates. These substrates are referred to in the tables as adhesive substances. The substrate and adhesive were tested for adhesion by pulling the two components apart. The + sign indicates that a solid mouth was formed that could not be separated by hand. A blank spot indicates that the bond failed the above test.

Substrate

gabeile 1

Adhesive fabric

gormica.

Wood 'Ijucite' Aluminum Glass Cellule Brewing

•, [se & cetat ^: nes

y y:! Pack-

', ^ paper

.aluminium steel Lucite JEolyc arbonat

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234412Q

Table II

Substrate

Adhesive fabric

Wood lucite aluminum glass cellulose israunes

acetate packpa

pier

Formica + + + + + + aluminum + + + + + stole + + + + + Luc! Te + + + Polycarbonate +

Table III

3M-4693

.Formica 4- + + ₊ aluminum * ₊ stole Ijuc it e Polycarbonate _{+ + + +}

gabeile IV

Jormica t ι I.
I. aluminum ι
+! + I! i + at «ία.

40381 1/1 toOS

Table IV continued

Substrate

Lueite

Adhesive fabric

Wood Lueite Aluminum Glass Cellulose Brown

ac et at Paekpa pier

· ♦

Eolycarbonate

^[ Formica

Tabel V Wilhold

jcormica + : + + ■ h : Aluminum + . stole + Eaicit β + Poly carbonate +

Table VI

X-5-0485

aluminum + -f. + I + stole + Lueite + + Polycarbonate +

409811 / 110S

-Vj- Table VII

substrate W. AnkleDender otofi • ₊ t
Pc ₊ P, ΙΈ TE ■ ΤΪΈ CA χ · ₊ + I + _{+ +} A. 0 L. ₊ - _{+ + +} " Wood (W) _{+ + + + +} Liicite (L) ₊ I.
ί ₊ Polycarbonate (PC) _{+ + +} + _{+ +} Polypropylene (FP) _{+ +} + ₊ Polyethylene (PE) + ₊ + Teflon (TB) _{+ +} H- KeIl-F (TFE) ₊ Cellulose
acetate (ca) ₊ Brown pack
paper (P) _{+ +} Mylar (M) _{+ + +} Aluminum (A) + + 4r Steel (S)

Table YIII SR-5 29

L. _{+ + + +} ra ₊ PP PE + TE ₊

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Table VIII continued

Substrate More sticky ₊ 1 T material 'X'FE I.
! GA P M ■ + • f A. Ϊ
1 C L PC P L · PE X ¹ E ί ₊ • + i. TFE : ι ι
i:! ! ! t ₊ j
t CA ;
j I.
ί P. ί
■ - ₊ j K. .1 i L S. i
'. i * ί

table IX SR-51 6

J, ₊ • ₊ I.
j i ₊ i - ι; ■ 1 Pc j ₊ ■ + ■ ' PP PS ₊ TF TFE CA ₊ P. H A.

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23441

Table X
Wilhold

Substrate

Adhesive fabric

W. L. Pc Pl PD IF *
4-] 4- Oa + M. L. {
I.
j I.
I. S. W. _{+ + + +} ; L. ₊ 4- ₊ . Pc PE ₊ EE + ₊ TF ₊ 0. ¹ PE GA ₊ 4- i P. ₊ ι M ' _{+ +} ί
I ■ I i a I.
] +

Table Xl

PG.

4-

i'F

4- ■ 4-

IE 1
⁺ , 4- ί 4- 4-, 4- ■ 4- y 4- ! 4- ₊ 4- TE !
I. 4- ! . 1
i -i ¹
U + i_ TVE I.
1
4- j_4- I 4- ι;
+! ι i
+ i ■ 1
1
- + j -f

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OBtGINAU

Substrate

a'ortsetzun, ^ l'abelle .X

Adhesive fabric

i I.

, L s EC j I j ΙΈ TIC '' j. j? ¹ *, j OA

ί Ψ

i + ι +

4-

ι +

It can be seen that a product of manufacture and a / experienced for the production of the same have been created, wherein a water-insoluble, pressure-sensitive adhesive or contact adhesive has been applied to a base bav *. will. Then the adhesive is freed from solvent by drying and the removable cover, which is made of a water-soluble or water-absorbent material in i? ⁵ orm of a film j of a woven or non-woven fabric or of a particulate material may be applied to the free surface of the adhesive. slightly wherein a free KXebstofioberflache remains to handle About surface. the release coating is readily accomplished by applying water to the coating removed _T in a tacky, rubbery state, which enables a second substrate or a second anklebender fabric over the adhesive in a suitable position is brought and adjusted slightly with regard to the position before the water evaporates and leaves a strong bond between the base, the adhesive and the adhesive otoff. Preferred embodiments of the invention have been described here. However, numerous modifications are within the scope of the invention and modifications possible.

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Claims (1)

Eat em; talks 1. Composed structure from a base, a water-insoluble, pressure-sensitive adhesive covering at least a portion of said backing, and a removable, water-insoluble, pressure-sensitive one Adhesive firmly adhering coating, which pz'aktisch the entire Surface of the adhesive area covered, characterized in that that the removable coating consists of a water-soluble material or a water-absorbent material and from the water-insoluble, pressure-sensitive adhesive by applying water to the free surface of the releasable Covering can be removed and the adhesive is free for can leave a use. 2. · Composite structure according to claim 1, characterized in that the base is metal. 3. Composite structure according to claim 1, characterized marked that the base is wood. 4. Composite structure according to claim 1, characterized indicated that the underlay is an organic synthetic Resin is. 5 »Composite structure according to claim 1, characterized marked that the backing is rapier. 6. Compound structure according to. Claim 1, characterized marked that the base is a film. 0 9 811/110 5 BATH ORIGINAL 7 · Compound image according to claim. I ₁ characterized in that the base is paper with an identification on the oeite, which is opposite to the 3eite with the adhesive present on it. ö. Compound structure nacii claim Ί, thereby characterized in that the document is a network and the adhesive fills the spaces in between. 9. Composite structure according to one of the preceding Claims 1 to b, characterized in that the adhesive is based on ßiliconoasis. 10. Composite structure according to one of the claims 1 to 8, characterized in that the adhesive is such is based on Kautachuk. 11. Composite structure according to one of the claims 1 to 8, characterized in that the adhesive is a polyurethane 12. Zusamaeixgeeetztes structure according to one of the claims 1 to 8, characterized in that the adhesive is an acrylic resin. 13 · Composite structure according to claim 1, characterized in characterized in that the peelable coating is a continuous film. 14. A composite structure according to claim 1J _5, characterized in that the continuous ifilm consists of cellophane. 15 · Compound ^ ebilae according to claim 13 » 4 0 9 8 11/110 5 BATH ORIGINAL characterized by ;, dai: - egg continuous film of paper consists. 16. Composite structure according to claim 15 »thereby characterized in that the continuous i'ilm made of gelatin consists. 1'7 · composite structure according to claim 1 $, characterized characterized in that the continuous film is made of a woven fabric. 18. A composite structure according to claim ¹ 13 »characterized in that the continuous film of a non-woven 'material consists ^x. 19 · Composite structure according to claim 1, characterized in characterized in that the removable coating consists of regenerated cellulose. 20. Composite structure according to claim 1, characterized characterized in that the peelable coating consists of a particulate material which is the water-insoluble, pressure-sensitive adhesive firmly adheres. 21. A composite structure according to claim 2o, characterized «^ Indicates that the removable coating consists of a syn synthetic organic resin powder. esetizuoii GebilJe according to claim 2o, thereby qcekennze.ichrii L, acli iia._; t eilcr: -jn.Jürmi ^ e material an iir: Oi.>"iiiiicch« pre-binding inC. Ly. '/ ,; ..: ami; ifjri {jeüotzte3 üebil / ie still eixiem j.er allegations 409811/1105 BATH ORIGINAL 1 Dis 2k !, characterized in that the base consists of a water-soluble material or a water-resistant material, the base of the water-insoluble,
pressure-sensitive adhesive can be removed by collecting vasaer on the free surface of the pad and
after removing the pad a free one on one side
Adhesive area for one use / leaves and then the peelable cover can be removed to put on the other
Side to leave a blank area of adhesive for use. 24-. Process for the production of an adhesive structure using a support, application of a
water-insoluble, pressure-sensitive adhesive on the substrate and removal of the solvent from the water-insoluble, pressure-sensitive adhesive by drying, characterized in that a removable coating is made of
consists of a water-soluble material to which the adhesive, freed from solvent by drying, applies water
applies to the free surface of the removable overspray
and the peelable coating from the water-insoluble pressure-sensitive adhesive exposing the adhesive for
one use removed. Dr.Ve/üo 4098 11/1105 BADORfGiNAL