MXPA00005512A - Release coating for tapes - Google Patents

Abstract

The present invention is directed to a release coating composition comprising a polymer of butadiene, styrene, acrylonitrile polymer having a Tg from 0 DEG C to about 75 DEG C. The present invention is also directed to an article of manufacture having a release coating comprising the polymer for pressure sensitive adhesives.

Description

COATING FOR TAPE RELEASE FIELD OF THE INVENTION The present invention relates to release coatings, and in particular to release coatings that can be used in conjunction with pressure sensitive adhesives.

BACKGROUND OF THE INVENTION I Q Pressure sensitive adhesives (PSAs) have extensive uses as bonding agents for making tapes, labels, decals, and the like. PSAs adhere to many surfaces with no more than applied finger pressure, v. Cgr .. various ribbons (office, packing, cover, etc.) or labels (office, boarding, identification, etc.). The adhesive is typically coated to a "backing", which includes any suitable substrate, such as films, thin foil, and paper. The adhesive can be 2o coated to one or both sides of the backrest. The back side coated with adhesive is termed as the "back side coated with adhesive". In the case of tapes, the backing coated with adhesive is typically rolled on itself to form a roll, wherein the coated backing side ihüm HSx? mM fc-jB with adhesive is in direct contact with the adhesive-free backing side of the continuous backing in the roll. As a result, the tapes typically have two sides or surfaces: one side that is coated with a PSA, and the other side of the tape, which is free of adhesive. Therefore, it is advantageous if the adhesive layer has a different affinity for one side of the tape than that of the opposite side (v gr, for both sides) of the tape. This differential affinity is typically achieved by two methods: the primer coating method and the release coating method. In the primer coating method, an adhesive having a low affinity for the backing is the one selected, and a primer coating is used to make the adhesive layer tightly bound to the backing, During winding, the backing side coated with adhesive , therefore, adheres less strongly to the backing side free of adhesive. Non-limiting examples of this method include solvent-based natural rubber adhesives coated on unplasticized polyvinyl chloride film and water-based acrylic adhesives coated to oriented polypropylene film, where the coated side of the backing has been "primed" by corona discharge treatment.

In the release coating method, a release coating is applied to the adhesive-free side of the tape and an adhesive is applied to the other side of the tape to form the backing side coated with adhesive. The release coating has a strong affinity for the backing but a weak affinity for the adhesive. The adhesive-free side of the backing that is coated with a release agent is referred to herein as the "release coated backing side". In certain cases, both sides of the backing may be coated with adhesive and a separate backing containing the release liner (release coated paper) may be applied to one or both sides of the backing sides coated with adhesive. A backing that has both sides coated with adhesive is referred to herein as "backing coated with double adhesive", and the side or sides containing the release coated paper is referred to herein as the "paper side coated with release". . These release liners make it possible for the tape to unwind from the roll (i) without using excessive force (low release release force) and (ii) without causing the adhesive to adhere to the backing side coated with release. They must also have the following characteristics. The low affinity of the release coating to the adhesive should be maintained during prolonged exposure to wide variations in temperature and humidity. The release liner should also be tightly bonded to the backing side so that it does not get dislodged when aggressive adhesives are used. Finally, it is desired that the components of the release coating do not migrate towards the adhesive, thereby deteriorating the properties of the adhesive. Conventional release coatings have been based on various polymers and copolymers prepared from monomers, such as alkyl acrylates and alkyl methacrylate, vinyl acetate, vinyl chloride and acrylonitrile and combinations thereof. These monomers, however, are relatively expensive, and some of these monomers also require special and more expensive handling due to their toxicity. 2o In addition, these conventional coatings often fail when the rolled tape is aged under heat and humidity. Therefore, an object of the present invention is to provide coating compositions release that provide coatings of Release with acceptable values of release force after prolonged exposure to heat and moisture. Another object of the present invention is to provide release coating compositions that include relatively inexpensive polymer components. These and other objects of this invention will become apparent in the light of the following exposition SUMMARY OF THE INVENTION The present invention is directed to a release coating composition which includes (a) from about 20% to about 55% by weight of a copolymer having a Tg from 0QC to about 759C, and (b) from about 45% to about 80% by weight of solvent. The copolymer has from 0% to about 50% by weight of acrylonitrile monomer, and from about 50% to about 100% by weight of butadiene and styrene monomers. The copolymer can further include one or more stability enhancing monomers. In one embodiment, the release coating composition may further include a release promotion additive. The present invention is also directed to release coatings obtained from applying and drying the release coating composition.

In another embodiment, the present invention is directed to a release coating that includes (a) from about 80% to 100% by weight of a copolymer having a Tg from 0 ° C to about 75 ° C, and (b) 0% to about 20% by weight of a release promotion additive. The copolymer has from about 0% to about 50% by weight of acrylonitrile monomer, and from about 50% to about 100% by weight of butadiene and styrene monomers In yet another embodiment, the present invention is directed to an article of manufacture, including (a) a backing having a backing side coated with adhesive, and (b) a release liner applied to the other side of the backing of (a) or a separate backing. The release liner is positioned so as to be in contact with the backing side coated with adhesive. The release coating has from about 80% to about 100% by weight of a copolymer having a Tg from 0SC to about 75QC, wherein the copolymer comprising from 0% to about 50% by weight of acrylonitrile monomer, and from about 50% to about 100% by weight of butadiene and styrene monomers. The release liner of this article of manufacture may also include a promotional additive * A of liberation, DETAILED DESCRIPTION OF THE INVENTION It has surprisingly been found that release coatings prepared from polymers of butadiene, styrene and acrylonitrile (BSA polymer) provide excellent, low release strength after prolonged exposure to heat and moisture. Hitherto, it has been believed by those skilled in adhesive / coating bouquets that styrene-butadiene polymers could not be modified satisfactorily to form effective release coatings. This belief results from the well-accepted chemical phenomenon that similar materials tend to have a high affinity for similar materials. Since pressure sensitive adhesives are typically produced from polymers based on styrene and butadiene hydrocarbon, v, gr. , styrene-butadiene-styrene triblock polymers, it was believed that effective release coatings could not contain styrene and butadiene monomers. In line with this belief, conventional release coatings have contained various polymers, prepared from chemically differing monomers of styrene and butadiene, such as alkyl acrylates and alkyl methacrylates, vinyl acetate, vinyl chloride, acrylonitrile and combinations thereof. . While effective, these conventional polymers used in release coatings are relatively expensive compared to the BSA polymers used in the present invention, and some also require special handling and are more expensive due to their toxicity.

A. Release Coating Compositions The release coating compositions of the present invention include: (i) a polymer of butadiene, styrene, and acrylonitrile, and (ii) a solvent. Preferably, the release coating compositions of the present invention further include one or more release promotion additives. The release coating compositions of the present invention include from about 20% to about 55%, preferably from about 30% to about 40% by weight of a polymer of butadiene, styrene and acrylonitrile ("BSA polymer") , from about 45% to about 80%, preferably from about 60% to about 70% by weight of a solvent. The term "approximately" as used herein, means roughly 10% of the stated value. The terms "BSA polymer" and "copolymer" as used herein, mean a polymer having two (styrene and butadiene), or more different monomers. The solvent can be any suitable fluid that can be evaporated at room temperature or by applying heat. The preferred solvents are those known in the art for use in emulsion polymerization, bulk polymerization, and mass-suspension polymerization. Solvents used in emulsion polymerization are more preferred. Non-limiting examples of the preferred solvents include water, 1 methanol, isopropanol, and mixtures thereof. These BSA polymers have a Tg from 0SC to about 75SC, preferably from about 20aC to about 60SC. The term "Tg" as used herein, means the transition temperature of 2nd glass of the polymer as determined by the Vox equation, which is described in Sperling, Polymeric Muiticomponent Materials, Chapter 1, p. 24-29 (1997). The BSA polymers according to the present invention have from about 0% to about 50%, preferably from about 5% to about 50% by weight of acrylonitrile monomer, and from about 50% to about 100%, preferably from about 50% to about 95% by weight of butadiene styrene monomers. More preferably, the BSA polymers have from about 15% to about 40% by weight of acrylonitrile mohomer and from about 60% to about 85% by weight of butadiene and styrene monomers. Typically, BSA polymers contain (i) from about 10% to about 35%, preferably from about 15% to about 25% by weight of butadiene monomer, and (ii) from about 25% to about 75%, preferably from about 45% to about 55% by weight of styrene monomer. The BSA polymers according to the present invention can be manufactured in accordance with any polymerization process known in the art. These polymerization processes include, but are not limited to, emulsion polymerization, bulk polymerization, and mass-suspension polymerization, as described in Kirk-Othmer, Encyclopedia of Chemical Technology, 4th Ed. Vol. 1, p. 396-398. Preferably, the BSA polymers are manufactured by an emulsion polymerization process. In one embodiment, the BSA polymers of the present invention include from about 0.50% to about 15%, preferably from about 1.0% to about 10%, of at least one stability enhancing monomer. The term "stability enhancing monomers", as used herein, means a monomer that provides colloidal stability for the polymer during emulsion polymerization and / or improves polymer properties, such as tensile strength. Examples of stability enhancing monomers include, but are not limited to, acrylic acid; Itaconic acid; acrylamide, such as N-methylacrylamide; fumaric acid; methacrylic acid; maleic acid; and the like. More preferably, the BSA polymers of the present invention include from about 0.5% to about 3.0% by weight of acrylic acid monomer, from 0% to about 1.5% by weight of itaconic acid monomer, and from 0.5% to about 3.0% by weight of acrylamide monomer. In another embodiment, the release coating compositions of the present invention further include from about 1% to about 15% by weight of a release promotion additive, which is added later. Added later means that the additive is added after the polymerization of the polymer is complete. Without wishing to be bound by any theory, it is believed that these release promotion additives help maintain or improve the release properties of the release coating. Examples of release promotion additives useful herein include, but are not limited to, anionic surfactants, cationic surfactants, zwitterionic surfactants, nonionic surfactants, and mixtures thereof. Typically, these surfactants contain alkyl chains d? C8-C22, aryl substituted with C8-C22 alkyl, silicon atoms, fluorine atoms, and combinations thereof, as described in "Handbook of Pressur? -Sensitive Adhesive Technology", ed. D Satas, Satas & Associates, Warwick, Rl, 1999, Cap. 26, p, 637-646. Non-limiting examples of useful release promotion additives include N-alkyl sulfuccinates, dialkyl sulfosuccinates, alkyl sulfates and sulphonates, alkyl-polyalkylene sulfoxide sulfates, alkyl aryl polyalkylene oxides sulfates, alkyl-aryl sulfonates, alkyl polyalkylene, alkyl aryl polyalkylene oxides, block copolymers of alkyl oxides and mixtures thereof. The specific examples of additives from j = release promotion useful in the present include, but are not limited to. Spray A-22 (manufactured by Cytec Industris, Inc., located in West Paterson, NJ), Oconol OP40 and Pluronic 62 (both manufactured by BASF Corporation, Mount Olive, NJ), Ammonyx SO (manufactured by Stepan Company, Northfield, IL ) and mixtures thereof. Optional Ingredients, The release coating compositions of the present invention may further include polymers that are known and conventionally used in release coatings. The release coating composition may further include from 0% to about 95%, preferably from 0% to about 50% by weight of a conventional release coating homopolymer and / or copolymer prepared from monomers selected from the group consisting of in alkyl acrylates and alkyl methacrylates, vinyl acetates, vinyl chlorides, acrylonitriles, siloxanes, organosiloxanes and combinations thereof. Typically, the BSA polymers of the present invention would be mixed with said conventional release coating polymers to form a mixture of the polymers.

B. Manufacturing Articles Having Release Linings In another embodiment, the present invention is directed to an article of manufacture that includes a backing having a backing side coated with adhesive and a backing side coated with release, as described above. . In this embodiment, the backing would roll over on itself so that the backing side coated with adhesive is placed in physical contact with the backing side coated with release. The dry release coating includes from about 80% to about 100% by weight of the BSA polymer. The dry release coating may further include up to about 20% by weight of a release promotion additive. In an alternative embodiment, one or both sides of the backing can be coated with adhesive (backing coated with double adhesive), and a release coated paper having a release coating, as described above, on a separate backing is placed in physical contact with one or both sides of the back sides coated with adhesive. The pressure sensitive adhesives that are useful in accordance with the present invention are conventional materials typically used and known in the art. Examples of pressure sensitive adhesives include, but are not limited to, natural rubber adhesives, butyl rubber adhesives; vinyl ether adhesives; acrylic adhesives; solvent-based rubber adhesives including cis-1,4-polyisoprene; block copolymer adhesives including styrene-butadiene-styrene block copolymers and styrene-isoprene-styrene block copolymers, hot-melt block copolymer adhesives; synthetic rubbers including styrene-butadiene rubber, silicone-based pressure sensitive adhesives; and the like. The backings that are useful in accordance with the present invention are any suitable substrates known in the art. Examples of useful backings include, but are not limited to, films, thin metal foil, nonwoven paper, fabrics and composites thereof. The release coating and the adhesive coating can be applied to the backing using conventional methods known in the art, such as knife coating, roll coating and printing coating. After the coatings are applied to the backing, they can be dried by any heating method that is well known in the art. Typically, the dry thickness of the release coatings is from about 0.1 to about 0.5 microns in accordance with the selection of backing, pressure sensitive adhesive, and coating technique. Dry release coating thicknesses of about 0 2 to about 0.35 microns are preferred For the BSA polymers of the present invention, 0.39 microns equals about 10 g / m2 EXAMPLES The following examples further describe and demonstrate embodiments within the scope of the present invention. The examples are provided for the purpose of illustration only and are not to be construed as limitations of the present invention, since many variations thereof are possible without abandoning the spirit. and scope of the invention Example 1 Preparation of Test Polymer Composition Detachment Force Performed on the Release Liner A Retrieved from Same A. Preparation of the Polymer Composition The following preparation method used a ???? Sjí- f * S .. -i and &. I ^ £ ^ ^ i ^^^ IA i ^ J ^^^ sai ^ ^ ÍJrjl faith "* '' r - 17m ' conventional emulsion polymerization process. A 3,785 liter reactor was initially charged with 114 9 grams of deionized water, 50.37 grams of seed latex, 1 19 grams of DISSOLVINE E-39 (chelating agent) and 9.51 grams of itaconic acid. The reactor was heated to 90 ° C and an initial dosage of 114.0 grams of 5% by weight in water solution of ammonium persulfate was added to the reactor. Then, four feeds were added to the reactor. an aqueous diet for 3.5 hours, a monomer feed for 3 hours, a butadiene feed for 3 hours and a catalyst feed for 4.75 hours. The aqueous feed included 178.5 grams of water, 55.6 grams of CALFOAM ES-303 (28% active by weight), 29.8 grams of acrylamide (50% active by weight), and 51.8 grams of acrylic acid (100% active by weight). Liquid monomer feed included 23.7 grams of t-dodecyl mercaptan, 404.7 grams of acrylonitrile, and 1204 grams of styrene. The feeding of butadiene 2o included 285 3 grams of butadiene. Catalyst feed included 266.6 grams of ammonium persulfate at 5% (w / w). After the fourth hour, the temperature rose to 95 ° C and 100 grams of hydroxide were added. % sodium (weight / weight) to the reactor to raise the pH of the -. »Sa, _V ... -? ^^^^ & á ^ m ^^^ í ^? Is i ^^^^? ^, ^ - ^ W ^^ (m? ^^ i? Ts ^ S ^ ii ^ ^ & £ '^ ii ^ a ^^ &'. " 'latex reactor was then added 56 mi of tert-butyl 5% (w / w) and 56 mi bisulfate 5% sodium (weight / weight) for 2 hours in order to purify the latex from the remaining monomers After cooling the reactor to 30 ° C., it was determined that less than 100 ppm of acrylonitrile was in the latex by the gas. the latex had a pH of about 7 and a total solids concentration of 49.1 wt%, indicating substantially complete conversion of all monomers to polymers BSA, the polymer composition of this latex sample calculated on the basis of mass balance was 56% by weight of styrene, 20.5% by weight of acrylonitrile, 20.0% by weight of butadiene, 0.5% by weight of itaconic acid, 2.33% by weight of acrylic acid, and 0.67% by weight of acrylamide. Additional mers are conventionally used in emulsion polymerization, such as n-methylolacrylamide, fumaric acid and the like, they can also be used in various combinations or separately.

B. Preparation of Release Coating A and Release Strength Test A crepe paper, saturated with polymer (manufactured by Tesa Tape Inc., located in Charlotte, NC of 11 79 kg / ream thickness, and saturated with Butofan NS 209 polymer manufactured by BASF Corporation located in Mount Olive, NJ), as is typically used for the manufacture of tape pressure-sensitive coating was coated by hand using a drawn wire rod stretched with 25% by weight of the total solids latex composition of Example 1 The latex composition was obtained by diluting 100 grams of the latex composition produced in the Example 1 (49 1% solids) with 96.4 grams of water to provide 196 4 of a latex composition having 25% by weight total solids. The liquid coating was dried at 150SC for 90 seconds resulting in a dry coating having a thickness of approximately 0.0005 millimeters, which is the typical thickness of release liners used in the masking tape industry. 1 thickness was determined by weighing square paper of 7 62 cms x 7 62 cms before and after coating, and using the ratio of 0.39 microns to approximately 10 g / m2. Commercial masking tape strips "General Purpose 10404 Masking Tape of 5.08 cms manufactured by TESA TAPE Inc, located in Charlotte, NC) were then adhered to the crepe paper now coated with the coating of Iy-20 - release. It is believed that the General Pse Masking Tape of 5.08 cms 10404 had a sticky, solvent-based natural rubber adhesive. A set of these bonded strips were aged by heating in an oven for 72 hours at 66 aC, and another set of these bonded strips were also aged by heating under the same conditions but with the additional maintenance of 80% humidity. The detachment force was then determined in five samples for each test set using a conventional INSTRON tester (INSTRON model 1125, manufactured by Instron Corporation, located in Canton, MA) with the release rate adjusted to 30.48 cms / min at room temperature. In accordance with the Pressure Sensitive Tape Council (PSTC) standards, the results are provided below in Table 1.

Example 2 Preparation of Polymer Composition and Release Force Test Performed on Coating B of Liberation Obtained from the Same. The BSA polymer composition was prepared as described in Example 1. However, about 2% by weight of AEROSOL A-22, a release promotion additive, was added to the composition before of coating on crepe paper, saturated with polymer, as described in Example 1. Two sets of bound strips were similarly prepared and aged with heat for 72 hours at 66 ° C. The release force results are given below in Table 1.

Comparison Examples 3-6 Comparison Examples 3-6 were also conducted using the same crepe paper, polymer saturated, commercial masking tape and test conditions as described in Examples 1 and 2. In Comparative Example 3 , release coating was not used. In Comparison Example 4, a conventional carboxylated styrene-butadiene rubber polymer (SXBR) having a desired high glass transition temperature of about 42EC was used to prepare the release coating. The XSBR, which has the trade name of Styrofan ND 834, was obtained from BASF Corporation, located in Mount Olive, NJ. In Comparison Examples 5 and 6, the release coatings having the same thickness as in Example 1 were prepared from commercially available acrylic-based release coating compositions. í »* j» faith «¡< J-. < -Ifeg «a - M &S« a ^ lÍM »¿. .i • *, i * i -! -? 'aS,, ^ igí * & R &H R-3253 (believed to contain a polymer of ethylacrylate and acrylonitrile with a release promoting additive subsequently added) and R &H WH-130 (which is believed to contain a polymer of ethylacrylate and acrylonitrile), respectively, obtained from Rhom and Haas Company. These examples are provided for comparisons for release coating performance.

Table 1 Summary of Test Results Examples Strength of Depression Release Used (gr / 5.08 cm) Aging Aged by heat lor so- and moisture lamente Example 1 of Coating A of 715.30 653.10 Invention Release 2 of Coating B of 653.10 590.90 Invention Release Example 3 of Coating 2674.60 2394.70 Comparison Example 4 of Convention XSBR 1803. 80 2208. Comparison Example 5 of Coating A 435. 40 528. 70 Commercial Comparison Example 6 of Coating B 715. 30 Fal la1 Comparison 23 - * - *** 1 release force too low, which is undesirable, »'Table 1 shows that Example 1 of the invention (BSA polymer without added additive later) and Example 2 of the invention (BSA polymer with 2% in weight of AEROSOL A-22) provided release characteristics with a peel strength between 466.50-777.50 grams / 5.08 cms, which is within the definition of "tight release", as described in the "Handbook of Pressure-Sensitive Adhesive Technology", ed. D Satas, Satas & Associates, Warwick, Rl, 1999, Cap, 26, Table 1, p. 635. More importantly, the peel strength values for the test samples aged by 1 heat and humidity were lower than the peel strength values of the test samples only aged by heat. In contrast, Comparison Example 3 (without release coating) provided the The usual adhesive release force characteristics of the masking tape pressure sensitive adhesive which adheres to various other surfaces that do not have a release coating surface. Similarly, Example 4 of 2 Comparison (release coating containing - * t * commercially available conventional XSBR polymer) resulted in very high release release strength. The release coatings of Comparison Example 5 (commercially available coating) provided low release force. However, the value of the detachment force of the sample aged by heat and humidity was higher than the value of the detachment force of the sample aged by heat. In addition, the release coatings of Comparison Example 6 (another commercially available acrylic base release coating) failed the moisture test with too low a release force. Other embodiments and uses of the invention will be apparent to those skilled in the art from a consideration of the specification and practice of the invention described herein. All documents referred to herein are either specifically and completely incorporated by reference. The specification and examples should be considered as an example only, with the true scope and spirit of the invention being indicated by the following claims. As will be easily understood by those with ordinary experience in the field, they can Ba -_ »- 4iWaSBlt-, and? easily make variations and modifications of each of the embodiments described within the scope of this invention as defined by the following claims,

Claims (17)

, "> ~ * - 26 CLAIMS

1. - A release coating composition, comprising: (a) from about 20% to about 55% by weight of a copolymer having a Tg of from 0QC to about 75SC, the copolymer comprising from 0% to about 50% in weight of acrylonitrile monomer, and from about 50% to about 100% by weight of 10 butadiene and styrene monomers; and (b) from about 45% to about 80% by weight of solvent.

2. The release coating composition according to claim 1, wherein the copolymer has a Tg of from about 20SC to about 60C.

3. The release coating composition according to claim 2, wherein the copolymer comprises from about 15% to about 40% by weight of acrylonitrile monomer, and from about 60% to about 85% by weight of butadiene and styrene monomers.

4. The release coating composition according to claim 1, in Wherein the copolymer further comprises about 0.5% to about 15% by weight of at least one stability enhancing monomer selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid, acrylamide, N-methylolacrylamide and combinations of the same.

5. The release coating composition according to claim 4, wherein the copolymer comprises from about 0.5% to about 3.0% by weight of acrylic acid monomer, from 0% to about 1.5% by weight of monomer of itaconic acid, and from 0 5% to about 3.0% by weight of acrylamide monomer.

6. The release coating composition according to claim 1, further comprising about 1.0% to about 15% by weight of a release promotion additive.

7. The release coating composition according to claim 6, wherein the release promoting additive is selected from the group consisting of anionic surfactants, cationic surfactants, zwitterionic surfactants, nonionic surfactants and mixtures thereof.

8. The release coating composition according to claim 7, wherein the release promoting additive is selected from the group q @ consisting of N-alkyl sulfosuccinimatos, dialkyl sulfosuccinates, alkyl sulphates and sulfonates, alkyl polyalkylene oxides sulfates alkyl aryl polyalkylene oxides sulfates, alkyl-alkyl sulphonates, alkyl polyalkyleneoxide, alkyl aryl polyalkylene oxides, block copolymers of alkyl oxides and mixtures thereof.

9. A release coating composition according to claim 1, further comprising a polymer comprising one or more monomers selected from the group consisting of alkyl acrylates and alkyl methacrylates, vinyl acetates, vinyl chlorides, acrylonitriles, siloxanes , organo-siloxanes, and combinations thereof

10. A release coating, comprising: (a) from about 80% to 100% by weight of a copolymer having a Tg from 0SC to about 75SC, the copolymer comprising about 0% to about 50% by weight of acrylonitrile monomer, and from about 50% to about 100% by weight of butadiene and styrene monomers, and (b) from 0% to about 20% by weight of an additive of release promotion. '-'afea - *' "'- -? ti * 2 * 1

11. - The release coating according to claim 10, wherein the copolymer comprises from about 15% to about 40% by weight of an acrylonitrile monomer and from about 60% to about 85% by weight of butadiene monomers and styrene

12. The release coating according to claim 10, wherein the copolymer further comprises from about 0.5% to about 15% by weight of at least one stability enhancing monomer selected from the group consisting of methacrylic acid, acrylic acid, itaconic acid, acrylamide, N-methylolacrylamide, and combinations thereof.

13. The release coating according to claim 12, wherein the copolymer comprises from about 0.5% to about 3.0% by weight of acrylic acid monomer, from 0% to about 1.5% by weight of itaconic acid monomer , and from 0.5% to about 3.0% by weight of acrylamide monomer.

14. The release coating according to claim 10, wherein the release promotion additive is selected from the group consisting of anionic surfactants. cationic surfactants, zwitterionic surfactants, nonionic surfactants, and mixtures thereof.

15. The release coating according to claim 14, wherein the release promoting additive is selected from the group consisting of N-alkyl sulfosuccinamates, dialkyl sulfosuccinates, alkyl sulphates and sulphonates, alkyl- polyalkylene oxide sulfates, alkyl aryl-10 polyalkylene oxide sulphates, alkyl-aryl sulfonates, alkyl polyalkylene oxides, alkyl aryl polyalkylene oxides, block copolymers of alkyl oxides and mixtures thereof. 16.- The release coating of 15 according to claim 10, further comprising a polymer comprising one or more monomers selected from the group consisting of alkyl acrylates and alkyl methacrylates, vinyl acetates, vinyl chlorides, acrylonitriles, siloxanes, 20 organosiloxanes, and combinations thereof. 17. A release coating obtained from a process comprising: (a) applying the release coating composition according to claim 1 to 25 a backup; Y (b) drying the substrate resulting from step (a) to remove the solvent. 18 - An article of manufacture, comprising (a) a backing comprising a back side coated with adhesive, and (b) a release liner applied to the other side of the back of (a) or a separate backing, the backing of release comprising from about 80% to about 100% by weight of a copolymer having a Tg from 09C to about 75SC, the copolymer comprising from 0% to about 50% by weight of acrylonitrile monomer, and from about 50% by weight about 100% by weight of butadiene and styrene monomers; wherein the release liner is in contact with the backing side coated with adhesive 19 - The article according to claim 18, wherein the copolymer comprises from about 15% to about 40% by weight of acrylonitrile monomer and of about 60% to about 85% by weight of butadiene and styrene monomers. 20. The article according to claim 18, wherein the copolymer further comprises about 0.5% to about 15% by weight of at least one monomer which improves the stability selected from the group consisting of methacrylic acid, acrylic, itaconic acid, acrylamide, 5-N-methylolacrylamide, and combinations thereof. 21. The article according to claim 20, wherein the copolymer comprises from about 0.5% to about 3.0% by weight of acrylic acid monomer, from 0% to about 1.5% 10 by weight of itaconic acid monomer, and from 0.5% to about 3.0% by weight of acrylamide monomer. 22. The article according to claim 18, wherein the release coating further comprises less than or equal to 15 about 20% by weight of an additive that promotes release. 23. The article according to claim 22, wherein the additive that promotes the release is selected from the group consisting of 20 n n anionic surfactants, cationic surfactants, zwitterionic surfactants, nonionic surfactants and mixtures thereof. 24. The article according to claim 23, wherein the additive that promotes the 25 release is selected from the group consisting of ^^ & = ^ i ^ = ^^^^^ g ^ ¿a = a ^^^^^^ = iaj? ij = ^ gii? in sulfosuccinamates of JKfe * alkyl "dialkyl sulfuccinates, sulfates and sulphonates of alkyl, alkyl polyalkyleneoxide sulfates, alkyl aryl polyalkyleneoxide sulfates, alkyl-aryl sulfatonates, alkyl polyalkylene oxides, alkyl-aryl polyalkylene oxides, block copolymers of alkyl oxides, and mixtures thereof. 25. The article according to claim 18, wherein the release coating further comprises a polymer comprising one or more monomers selected from the group consisting of alkyl acrylates and alkyl methacrylates, vinyl acetates, vinyl chlorides, acrylonitriles, siloxanes, oxgano-siloxanes and combinations thereof, ? S > -. "*.: '^ *