AU618768B2 - Multilayered, flexible transfer strip - Google Patents

Description

618768 COMMONWEALTH OF JJSTRALIA Patents Act 1952 t

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1~ I Correspon-i--h- to West German Patent Application No. P 37 41 022.0 and No. P 38 35 783.6 CONVENTION PATENT APPLICATION FOR THlE INVENTION ENTITLED:- JT'4SFL:2R S-RP,0 "MULTILAYERED, FLEXIBLE 1 YfflEEt The following statement is a full description of this invention, including the best method-of performing it known to us: 1R la The invention relates to a multilayer, flexible transfer strip or ribbon with an auxiliary carrier and a contact adhesive layer and between said auxiliary carrier and said contact adhesive layer is provided a. bindercontaining transfer layer, which has a greater adhesion with respect to the contact adhesive layer than with respect to the auxiliary carrier.

Nmnerous possibilities are known according to which pigmented, liquid systems can be used for covering incorrect written representations. Thus, in the office field, white pigmented dispersions containing a highly volatile organic solvent are applied, with a brush for correcting typed characters and the like. However, the evaporation of the highly volatile organic solvent is prejudicial to the environment. It is necessary to wait a relati vely long time before evaporation s ended and typing over is possible. The application of correction dispersions with a brush generally C does not lead to a uniform coating.

Better correction is made possible by DE-OS 26 26 891, which describes a multilayer, flexible transfer sheet, which is formed from an auxiliary 4:C IC t t carrier coated with an adhesive separating layer, a polyvinyl alcohol-bound transfer layer and a thin adhesive coating. The transfer layer also S~contains titanium white as the pigment. After removal of the auxiliary 2 J carrier, it serves as a correction coating for incorrectly typed characters.

There is no mention of use in a hand transfer roller, as described hereinafter in connection with the invention and, as tests have shown, this would not lead to the desir-e sharp tear-off of the correcting coating.

The problem of the present invention is to so further develop the aforementioned transfer strip, that the binder-containing transfer coating can be cleanly and sharply applied to the points to be covered and also the use in a hand device permits a sixrple, rapid and uniform application to the substrate.

The problem is inventively solved in that the binder-containing transfer coating contains a tear-off aid in the form of a soluble cellulose derivative.

lb In onle aspect this inveniLioni ves'ides broadly iri a miulLil a yer. fl1e xi ble Lri-an sf er- s Lri p four a p ply ig ais Lr-arflSfelr coaLing Lu a subs Lr-aLe for- Lhe applicaLionl of a solid u rec Lioni coaLing layer Luwi LLen r-epvesentaLiunis on said subs LiaLe, said Lransfer- s Lrip including: anl auxiliar-y cri a conLauL adhesive coaLing; arid a bindev-coniLaining ti-rnsf er coating, iriLer-jiediaLe said auxiliaryv carrier- arid said conLacL adhesive coaLing:.

wher-eini said binider-con Lamning Lrans fer uoa Ling adher-es' niur-e sL ro ig ly Lu Lhe coniLauL adhesive coaLinig Lhan Lu ULhe a u xili ar.,y uarr ieri arid includes a shar-p Lear-ouff ageriL comprisinig a soluble cellulose deriva Live pr-esenL in said binider-cunLainiig Lvanisfer- coaLing in Lhe raLiu of beLweeri anid 5 by weighL, whereby said Lransfetr coaLinig can be shar-rly Lorin-off from11 said auxiliary carr-ier- when Said Lransfer- coating is applied Lu said subs LraLe for- applying a solid coLrecLiori coaLing layer, Lu wriL Len r-eresenLaLions onl said subs LraLe.

*In ano Lher- aspecL LThis iniven Lion resides broadly ini a proucess fuor the prouduc L uni o f a iiiu1L i-l1ay er, flexible Li'rsfer- s Lvip as her-eini definied, said procuess inicludinig: 2b applying a plas Lics solu Lion including a shar-p Lear-ouff ageniL compr-isinig a soluble cellulose derivaLi-ve Lu a aflexible auxiliar-y catrrier.

aevapur-aLinig the sulvenL in said plasLics soluLion aL a eleva Led LeinperaLur-e: applying ani aqueous disper-sion con Lainiing a con Lac L adhesive Lu a Lr-ans f er coatinig f ormed by said plas L u solutioni oni said auxiliary carr.Lier upon evaporatiori of said solventL; anid evaporating Lhe waLer fr-om said aqueous disopersiun.

Ini a furtLher- aspect this invention resides br-oadly in a miulti-layer, flexible tvrnsfer- str-ip as herein defined, When used in rolled-up formi in a hanid-held L-oller device.

7'T 2- 2- The auxiliary carrier of the inventive flexible transfer strip preferably canprises a plastic film, as are used in connection with the carriers of typewriter ribbons, e.g. of polyethylene terephthalate, polypropylene, polyethylene, polyvinylchloride and polycarbonate. Silicone-coated paper is also suitable as the auxiliary carrier. The silicone coating reduces the adhesive tension between the binder-containing transfer coating and the auxiliary carrier. The silicone coating can also be replaced by a different antiblocking agent, such as e.g. by polytetrafluoroethylene.

SThe auxiliary carrier thickness is preferably approximately 10 to 60 m, particularly 15 to 55 pn, the top coating has a thickness of approximately to 40 pn, particularly approximately 15 to 25 pm and the contact adhesive coating a thickness of approximately 1 to 8 pm, particularly approximately 2 to 5 rn. In order to optimize the inventive transfer strip, it is S appropriate to choose a thickness ratio of the contact adhesive coating to the transfer coating of approximately 1:4 to 1:12, particularly approximately 1:8 to 1:10.

P C* The contact adhesive coating can camprise ccmercially available contact adhesives. These are materials which constitute elastic and permanently adhesive self-adhesive masses with high adhesive forces and which irmediately adhere to various surfaces under limited pressure at ambient temperature. They are preferably applied in an aqueous solution to the Stransfer coating already located on the auxiliary carrier, because in this way the already formed binder-containing transfer coating is not dissolved again. Among the contact adhesives of this type, those based on acrylate are particularly advantageous. The starting materials can be viscous solutions or dispersions, which are based on rubber, polyacrylates, polyvinylethers or polyvinylisobutylene. Preference is given to materials based on polyacrylates. Suitable coanercial products are Ucecryl 913R and Ucedryl PC80 (marketed by the firm UCB, Ammelicht, Belgium), as well as plastic dispersion VP 859/6 (marketed by Freihoff). Preferably the contact adhesive material to be applied and which is regularly present in an aqueous medium, contains wetting agents or surfactants (marketed under the trade nane Byk Said solutions or dispersions of the contact adhesive for forming the contact adhesive coating are preferably applied in a |e 113~~ i~;

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t -3- 2 quantity of approximately 1 to 5 g/m and in particularly preferred manner approximately 2 to 4 g/m 2 to the transfer coating.

For the fonnation of the binder-containing transfer coating, preference is given to the use of thermoplastic or thermoelastic polymers in solution or in the form of a dispersion. Within the scope of the invention, the following substances are advantageously used for solving the set problemn: a) Polyurethanes with a molecular weight of 15,000 to 50,000, e.g.

Pernuthane U 4924 of Stahl-Chemie or Desmolac 2100 of Bayer AG, b) linear, saturated polyesters with a molecular weight of 20,000 to 30,000, e.g. Vitel PE 307 of Goodyear Tire Rubber, c) styrene-isoprene-styrene copolymers, e.g. Cariflex TR 1107 of Shell-Chenie, d) acrylates and methacrylates, e.g. Pexigum 7 H of Roehm GmbH, e) diphenyl carboxylic acid-modified polyanides, cf. Scope 30 of Rhone-Poulenc or Eerez 1533 of Enery Chenicals, f) polymer dispersions based on vinylpropionate, e.g. Propiofan 6D of

BASF,

g) carboxymethyl group-containing, water-soluble polymethacrylate, e.g.

Rohagit SD15 of Roehn GmbH.

This list does not claim to be complete and does not represent a restriction t as regards choice. It is in fact readily apparent to the Expert that other t binders can be used, particularly as the nature of the binder does not constitute the essence of the invention.

In order to achieve an optimum embodiment of the invention, when choosing the particular binder for forming the transfer coating, account must also 'be taken of the nature of the plasticizer used. A plasticizer should be used which, on applying the transfer coating to the surface to be corrected or covered, does not penetrate the normally thin contact adhesive coating and does not cane into contact with the point to be corrected or the colouring agents located there and does not dissolve sane in a disturbing manner, accanpanied by the discolouration of the transfer coating. It has been found that standard plasticizers, such as silicone, castor and mineral 3 -4oil are suitable. Other plasticizers used in preferred manner in other fields, such as e.g. phthalates and olein alcohol are not as suitable. In order to counteract the disadvantageouis effect of plasticizers in borderline cases, into the binder-ccntaining transfer coating can be incorporated _a so-called "lake, which precipitates or renders insoluble any migrating colouiring agent, so that same does not migrate into the transfer coating applied, so as to recolcoar it. Suitable lakes are tannin and tannin derivatives. in general it is possible to use lakes of the type known from the field of inks and India inks. They are preferably present in a quantity of approximately 0.5 to 5% by weight, particularly 1.5 to 3.5% by weight in the binder-containing transfer coating. Particular preference is given, to approximately 2 to 2.5% by weight.

Duiring the preparation of the transfer strip according to the invention, the binder selected for forming the transfer coating is preferably brouaght into the form of a solution or when a polynter dispersion is present is used as a dispersion. The choice of solvent is dependent on the nature of the binder used. Preference is given to low to medium-boiling, organic solvents from the group of alcohols, such as ethanol, isoprcpanol and 1,itanol, ketones, such as acetone and methyl ethyl ketone, esters, such as methyl 2dc and ethyl acetate, aromiatic hydrocarbons, such as toluene, aliphatic hydrocarbons, such as benzenes in the boiling range 70 to 140 0 C, alone or mixed, as well as water, alme or mixed with low~'-boiling, water-soluble organic solvents. The binder concentration in the solution or dispersion is not essential to the invention. As a rough guideline, it can be between approximately 3 and 15% by weight, preference being given to the range approximately 4 to 10% by weight. For the formation of the transfer coating, said solution or dispersion is preferably applied in a quantity of to 25 g/m 2 and in particularly preferred manner between 18 and 22 g/m 2 to the auxiliary carrier.

Within the franework of the invention the term "colouring agent" is to be understood in the widest sense and constitutes a collective term for all colour-ixrarting substances, including dyes and pignients, whereby the latter can also have a filler character. Dyes are understood to mean those colouring agents, which are soluble in water, organic solvents or binders, -4oil are suitable. Other plasticizers used in preferred manner in other fields, such as e.g. phthalates and olein alcohol are not as suitable. In order to counteract the disavantageous effect of plasticizers in borderline cases, into the binder-containing transfer coating can be incorporated a so-called "lake", which precipitates or renders insoluble any migrating colouring agent, so that sane does not migrate into the transfer coating applied, so as to recolour it. Suitable lakes are tannin and tannin derivatives. In general it is possible to use lakes of the type known fran the field of inks and India inks. They are preferably present in a S quantity of approximately 0.5 to 5% by weight, particularly 1.5 to 3.5% by weight in the binder-containing transfer coating. Particular preference is given to approximately 2 to 2.5% by weight.

During the preparation of the transfer strip according to the invention, S the binder selected for forming the transfer coating is preferably brought into the form of a solution or when a polymer dispersion is present is used as a dispersion. The choice of solvent is dependent on the nature of the S binder used. Preference is given to low to medium-boiling, organic solvents from the group of alcohols, such as ethanol, isopropanol and butanol, ketones, such as acetone and methyl ethyl ketone, esters, such as methyl and ethyl acetate, arnmatic hydrocarbons, such as toluene, aliphatic hydro- SI carbons, such as benzenes in the boiling range 70 to 140 C, alone or mixed, as well as water, alone or mixed with low-boiling, water-soluble organic solvents. The binder concentration in the solution or dispersion is not Sessential to the invention. As a rough guideline, it can be between approximately 3 and 15% by weight, preference being given to the range approximately 4 to 10% by weight. For the formation of the transfer coating, said solution or dispersion is preferably applied in a quantity of to 25 g/m 2 and in particularly preferred manner between 18 and 22 g/m 2 to the auxiliary carrier.

Within the franework of the invention the term "colouring agent" is to be understood in the widest sense and constitutes a collective term for all colour-inparting substances, including dyes and pignents, whereby the latter can also have a filler character. Dyes are understood to mean those colouring agents, which are soluble in water, organic solvents or binders, l if as opposed to insoluble pignents. The colouring can be immediately present, but can also appear through fluorescence. The latter e.g. applies in the case of fluorescent luninous colours. If the inventive transfer strip is used f or correcting typed characters, pictorial representations, etc., the binder-containing transfer coating more particularly contains white pigments, such as titanium white, precipitated chalk, alumina or colloidal silicic acids. If the transfer coating is to be coloured, then the colouring agents used are inorganic pigments, such as chrome yellow, ochre, iron oxide red, cobalt blue, ultramarine blue, berlin blue, or organic pigments, t1 0 such as alkali blue, phthalocyanins, azo dyes, anthraquinonoids, metal corplex pigments, as well as carbon blacks and iron oxide black. Exaples Sof fluorescent dyes are Blaze Orange T 15 of Dayglo, Maxilonbrillant flavin GFF of Ciba Geigy, Pyranin of Bayer AG and Basonyl-Iot 540 of BASF.

The control of the optimum covering function of the inventive transfer strip, particularly that of the binder-containing transfer coating, can r take place through the pigment content. The optimum pignent content is dependent on various factors, such as the nature of the binder chosen, the actual pignent and the incorporated additives. A particularly critical value or range cannot be given. As a rough guideline, the binder/pigment 26 ratio gives a weight ratio of approximately 1:1 to 1:12, particularly 1:3 to 1:8 and more particularly approximately 1:4 to 1:7.

The essential component of the binder-containing transfer coating of the inventive transfer strip is a "tear-off aid". only the use of such a tear-off aid ensures that on applying the transfer coating to a substrate there is a clean tear-off under tensile stress conditions. It has surprisingly been found that a relatively limited caTpound group has the desired characteristics as tear-off aids within the scope of the invention, namely soluble cellulose derivatives. Particularly preferred cellulose derivatives are cellulose ethers which are soluble in organic solvents and/or water, such as methyl, ethyl, hydroxyethyl, ethylhydroxyethyl and carboxymethyl celluloses, cellulose esters, such as cellulose acetate, acetobutyrate and propionate. However, numerous other soluble cellulose derivatives are suitable and bring about the desired effects. It would appear that the basic cellulose structure in the soluble cellulose I derivative is important, whilst the introduced groups, such as the ethyl group, etc. lead to the derivative formed being soluble in the particular chosen solvent.

The quantity of the tear-off aid incorporated into the transfer coating is not critical, being dependent on the nature of the binder, that of the pigment and that of the other incorporated additives. Preference is given to a quantity of approximately 0.5 to 5% by weight, particularly approximately 1.5 to 3.5% by weight. Particular preference is given to the range of approximately 2 to 2.5% by weight. These details refer to the dry A I substance. The quantity ratio of the tear-off aid to the binder could also be used as a basis f or the formation of the transfer coating. As a rough guideline the transfer aid to binder ratio could be given as approximately 1:2 to 1:20, preference being given to the range of approximately 1:4 t to 1:10.

11 For controlling the application process and also the characteristics of the transfer coating applied to the substrate, further additives can be incomporatedi into the sane. These can in particular be agents for improving the covering power, such as in particular aluminosilicate, tinting agents, such as e.g. carbon black, or the aforementioned lakes, particularly for basic dyes in the form of e.g. gallic acid derivatives, such as Printan of Ciba Geigy.

The af orenentionei materials of the individual coatings of the inventive transfer strip generally satisfy the basic requiremient that the adhesive tension (defined via the adhesional work corresponding to the DuIpre equation, cf. K.L. Wolf "Physik und Chemie der Grenzfl~ichen, Springer Verlag 1957, p 164) between the contact adhesive coating and the transfer coating is higher than that between the auxiliary carrier and the transfer coaifing. If this is not so in a particular case, then a suitable antiblocking agent must be applied to the auxiliary carrier in order to fulfil this basic requirement. in such cases a further requirement is regularly respected, according to which the transfer coating formed on the substrate is non-adhesive with respect to other materials, particualarly paper, caning into contact therewith. Thus, the follow'~ing adhesive tens ion -7conditions can lead to the successful use of the inventive transfer strip, whereby the symbol represents the adhesive tension ratio between th, different materials, i.e. S 1 paper/contact adhesive coating, S 2 transfer coating/contact adhesive coating, S3 transfer coating/auxiliary carrier,

S

4 transfer coating/paper and S5 contact adhesive coating/auxiliary carrier and the following yquiraents are respected: S 1 higher than S3, S2 higher than S 3

S

5 much smaller than S and S 5 smaller than S Moreover, the free surface of the transfer coating applied to a substrate, particularly paper should not have an adhesive power to the outside, i.e. S 4 is then t '1Q zero or moves towards zero. In other words, the applied transfer coating ,o an contact with the hand or paper should not be adhesive.

The advantageous process for producing the transfer strip according to the

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invention is characterized in that a suitable plastics solution, which S, contains the aforenentioned tear-off aid, is applied by conventional application technology, e.g. a doctor blade, to an auxiliary carrier in J the form of a flexible film, the solvent is evazorated at elevated temperaL-ure, then an aqueous dispersion containing a contact adhesive is applied by conventional application technology, such as with a doctor blade or a roll coater, to the binder-containing transfer coating formed and 200 subsequently the water is evaporated.

When using the transfer strip according to the invention, it is advantageous to use carnercial applicators, which permit a roll transfer of the transfer coating provided with the contact adhesive, whilst simultaneously drawing in the auxiliary carrier. This leads to particularly easy handling of the inventive transfer strip. They can be constituted by commercially available hand devices. A particularly suitable device of this type is a so-called hand roller, where a delivery spool with the transfer strip is located within an easy-to-grip housing aid fran there it is led out oc an applicator foot projecting from the housing and from said foot is returned to a winding spool in the housing. A suitable gear between the spools in the housing ensures that the transfer strip is always adequately tensioned. For using the transfer strip, the user takes the housing in his hand and by means of the applicator foot presses the outer (detachable) strip coating passing over the terminal edge against the substrate to which it is to be trans- I I I 1 -8ferred a printed sheet of paper for carrying out corrections). During pressing, the user mcwves the device relative to the substrate and thereby transfers an e.g. covering or fluorescent coating to the substrate, the flexible auxiliary carrier being unwound fran the delivery spool and wound onto the winding spool.

The inventive transfer strip is particularly suitable for use as a correction mediun in the office, school and hrne for the purpose of covering incorrectly typed characters, markings, drawings and reinscriptions.

Another use of the transfer strip can be for the coloured marking of surfaces, docuiets and/or signs and then the transfer strip contains a transfer coating containing a coloured pignent. Another use is the stressing of text points, symbols or pictorial representations. For this purpose the transfer coating is preferably transparent and coloured with a daylight-fluorescent colouring agent. In all the presently mentioned use exarples it is particularly advantageous that application takes place "dry", i.e. there is no smudging of liquid coatings and no evaporation of objectionable solvents, so that inmediate reinscription is possible. Thus, the inventive transfer strip permits the easy, rapid and uniform application to substrates of e.g. covering coatings, which in particular contain colouring agents. If the transfer coating of the inventive transfer strip is transparent, i.e. does not contain any covering pigments for exaTple, then it can be used for the mere covering without colouring action and also t W for preserving and protecting written characters which would otherwise be sensitive to the action of air and the like.

The invention is explained in greater detail hereinafter relative to exruples.

Lhcaple 1 Firstly the following dispersion is prepared for forming the colouring agent-containing transfer coating parts by weight): Solvent-soluble polyurethane (Permuthane U 4924) in isopropyl alcohol/toluene, mixing ratio 1:1) 19.0 p.b.w.

Isopropanol 10.0

F

-9- Toluene Lake (Printan G) Ethylcellulose N7 (tear-off aid) Titanium dioxide (Kronos 1N34) Aluninosilicate P820 (covering power iiproving agent) Carbon black (Printex 140V) (tinting agent) 35.0 p.b.w.

29.0 0.01 100.01 p.b.w.

I t.

C. r

C

rer C t C I; 11 t; Ct tt C tC t Si t; t t I- 1 r 4 t CCt The above covering substance was applied with a doctor blade in a quantity of 18 g/m to a siliconized paper carrier. The solvent wa, then evaporated at approximately 100 °C by passing over hot air. Using a doctor blade, an aqueous dispersion having the following constituents was then applied to the surface of the colouring agent-containing covering coating: Acrylate-based contact adhesive (plastics dispersion VP 859/6 of Freihoff) (acrylic ester-based ccpolymer) Water Wetting agent or surfactant (Byk W) i 66.9 p.b.w.

33.0 0.1 100.0 p.b.w.

The contact adhesive substance was applied with a thickness of 2 g/m 2 using a doctor blade. The water fraction was then evaporated at approximately 100 °C by passing over hot air.

The transfer strip obtained was particularly suitable for covering typed characters on paper. It led to a rapid, uniform application of a cover strip on which it was possible to directly retype. Application took place by means of a ccmnercially available hand roller.

Example 2 Example 1 was modified in that for forming the colouring agent-containing transfer coating, the following formulation was used: 10 Polyurethane (Desmolac 2100 of Bayer AG) Methylethyl ketone Toluene Maxilonbrillantflavin 10 GFF (BASF) Basonyl-Rot 540 (BASF) Titanium dioxide (Kronos RN 34) Aluminosilicate P 820 (Degussa) Ethyl cellulose N7 (Hercules) 5.0 p.b.w.

30.0 28.6 0.4 29.0 good covering c Sr r t C C s r The transfer coating of the transfer strip obtained had a power, was coloured (orange) and had no fluorescence.

Example 1 was modified in such a way that the following formulation was used for forming the colouring agent-containing transfer coating: Linear, saturated polyester (Vitel PE 700 Goodyear) Methylethyl ketone Toluene White pignent, zinc sulphide (Sachtolith L Sachtleben GmbH) Ethyl cellulose N7 (Hercules) Blaze Orange T 15 (Dayglo) 4.0 p.b.w.

30.0 31.0 tx t Ce 25.0 The transfer coating of the transfer strip obtained had a .power, was coloured (orange) and had fluorescence.

good covering Example 4 Example 1 was modified in such a way that the following formulation was used for forming the colouring agent-containing transfer coating: Styrene-isoprene-styrene copolymer (Cariflex TR 1107 Shell) Methylethyl ketone 4.7 p.b.w.

42.0 I AM

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i; 11 Toluene Redglo Soluble Toner GF 13 (Redglo) Ethyl cellulose N 22 (Hercules) Alnmininum stearate Alugel TH 34 (Brlocher) Silicic acid (Aerosil 200 Degussa) 42.0 p.b.w.

0.8 Cf CC C C C C CC SCt C b

*I

s*t c CC C

C

*i C The transfer coating of the transfer strip obtained was transparent and coloured (orange).

Exarple Exanple 1 was mcdified so that the following formulation was used for forming the colouring agent-containing transfer coating: Vinylpropionate-based polymer dispersion (Propionfan 6D BASF) Titanium dioxide (Kronos RNCX) Aluminosilicate P 820 Water Walocel MW 50 GB (Wolff Co.) Isopropanol Aqueous solution of a silicone-free, halogenated, organic ccnpound (froth suppressor SF Hoechst AG) Sodium dioctyl sulphosuccinate (Lutensit ABO/wetting agent BASF) 20.0 p.b.w.

30.0 28.5 14.0 The transfer coating of the transfer strip obtained had a gocd covering power and was white.

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Claims (11)

1. A inul Li-layer, flexible LLals fer- s Lrip Cuir applying a Lr-an sf er- coaLinig Lu a subs LraLe fur- Lhe applica Lion of a solid corr-ec Lion coaLinig layeir Lu wri L en repr-eseniLaLioris on D said subs LraLe, said Lvrnsfeir s LrEip including: an auxiliar-y carrierC. a cuniLauL adhesive coaLing; arid a binder--con Lairlirg Lraiisfer- coaLinig iniLeVllediaLe said auxiliar-y uarrier- arid said uonLauL adhesive coaLinig; wher-ein said binider-coriLaininrg Lvrnsfer- coaLinig adher-es more s Lvrngly Lu Lhe coniLauL adhiesive coaLing Lhani Lo Lhe auilay carri er and includes a shar-p Lear-off ageriL compr.)Lising a suluble cellulose derivaLive pr-esenLt in said biner-on~ing rnsfer- coaLinig in Llie raLio of be L%-een 0.5% anid 5.0% by weighL, whereby said Lvrnsfer- coaLing can L-rnsfe coaLinig is applied Lo said subs LraLe 'oi- applying a solid urriecLion coaLing layer Lo wri LLeni repr-eseiLaLionis on said subsLr-aLe.

2. A mul Li-layer-, flIexi bl1e Lr an isf e r s rip accor-ding Lu claim 1, char-acLevised in LhaL said cellulose derivaLi\ e is eLhyl cellulose.

3. A mul L i-l1ay er, flexible L-rnsf er s Liip according LU e± Lher- claim 1 or- 2, characLerised in LhaL said auxiliavy -125 carr-ier, comprises a plas Lic and/or- a s i.liconie-coaLed paper-. A mul Li-layer-, flexible Lvrnsfey. s LrEip according Lu any, urie of claims 1 Lo 4, characLeirised in Lhat, said L-rnsfev. coaLinig coriLains a poly ureLhanie as Lhe binder-. A miulLi-layer, flexible L ira ris fetr sLrip according La claim 4 char-ac Leiised in LhaL said polyure Lhanie is an aliphaLic orie-comporieriL polyure Lharie. RAZ/", 6. A mulLi-layer, flexible Lvrisferv sLrip according Lo any one of claims 1 Lu 5, char-acLer-ised in LhaL colouL-rig agertLs _1VI 41 9? 4I #4

4.44 4 t .44.9 44 4 4 41 44 4t, It t *0 I C ti 4; I C, It 00 41 44C0 I 1 0 ~2 0 1*04;*4 I t 4 44 4 44 4 4 94 #4 I 13 ar.e preseniL in said Lvrnsfer coaLing 4

7. A wulLi-layer-, f lexible L-rns f er s Lrip accor-ding Lu claim chlaracLer-ised in LhaL said colouving agen L is a pigmen L.

8. A miul Li-layer, flexible Lvrnsf er s Lrip accor-ding. Lu claim 7, char-acLer-ised in Lha L said pignieriL i s a wlii iLe pigmeriL wi Lh a covevrng poweLr for- correcLion pur-poses.

9. A miul Li-layer, f lexible Lr-arisferL s Lrip accor-ding Lu claim 7, charac Lerised in Lha L said pigmnenL is ani or-ganic or. inorlganlic colurLed pigLmen L for mlar-king' purposes. A mulLi-layer, flexible LrLan sf er sLrip accor-ding Lu claim 6, chiaracLer-ised in Lha L le coluring agenlL is a fluorescen L dye for- s Lressinig Lex ,L char-acLers arid pic urial represenLaLiois

11. A miul Li-l ayer-, flexible Lraris fer s LrEip aucor-dirig Lu any onie of Claiiis 1 Lo 10, char-acLer-ised in LhaL said Li-rsfer- coaLinig includes a lake forL in~orpUrEa Ling a basic dye.

12. A mul Li-layer, flexible L-rnsfer s Lrip aucording Lu anyv onie of claimis 1 Lu 11, charac Ler-ised in LhaL Lhe Lbickriess taLiu of said con Lau L adhesive coaLing Lu said Lr-afisfer- c-oaLing- is appr-oximaLely 1:4 Lu 1:12.

13. A mul Li-layer, f lexible LLrnsf er sLrip according Lu claimi 12, characLerised in Lha L said Lhiknies s vaLio is apprvuxiwaLely 1:8 Lu 1:10. ~Lu A' 4

14. A pr-ocess for, Lhe pr-oducLiori of a uiulLi-layev, flexible Lvrsfer s:;trip accor-ding Lu any uric of claims 1 Lo 13, said pr-ocess including: applying a plasLics soluLion including a sharp Lear-off agen L comprising a soluble cellulose deirivaLive to a flexible auxiliarEy ca'rrier'; evaporaLing the solventL in said plas Lics solu-Liori aL -13a eleva Led Lemipera Lure; applying an aqueous dispersion coriLaiing a uonLacL adhesive Lo a Lrais f er coaLing f ormned by said plas Lb soluLion on said auxiliary carrier upon evaporuLioni of said solvexiL; anid evaporaLing Lhe waLer fromt said aqueous dispersion. A mul Li-layer, flexible Liratsfer s Lrip according Lo any one of claims 1 Lo 13, wheni used in rolled-up forii in a hand-held roller device. DATED Lhis TWENTY-FIFTH day of OCTOBER 1991. PELIKAN AKTIENGESELLSCHAFT BY PIZZEY COMPANY PATENT ATTORNEYS i -14 ABSTRACT A description is given of a multilayer, flexible transfer strip with an auxiliary carrier and a contact adhesive coating, whereby between the auxiliary carrier and the contact adhesive coating is provided a binder- containing transfer coating, which has a stronger adhesion to the contact than adhesive coating to the auxiliary carrier. The binder-containing transfer coating contains a tear-off aid in the form of a soluble cellulose derivative. On incorporating white pigments into the transfer coating, S the transfer strip can be used for correcting written representations or t typed characters. Correction takes place rapidly and simply and leads to S, the formation of a uniform coating with a sharp tear-off. t t t t t t t I, I* f I