MXPA98001706A - Articles coated with dependable coatings capable of accepting organic pigment electrofotograf - Google Patents

Abstract

An article that is capable of accepting and retaining printed signs and indications and still, maintaining good detachment properties. The article of the present invention is coated with a release agent on a substrate such as paper. Peelable coatings capable of accepting organic pigment particles emitted by electrophotoconductive devices comprise a polymer having at least one polymeric vinyl segment having a Tg between -10 ° C and 65 ° C and at least one polymer segment of siloxa

Description

ARTICLES COATED WITH DEPENDABLE COATINGS CAPABLE OF ACCEPTING ORGANIC PIGMENT ELECTROPHOTOGRAPHIC FIELD OF THE INVENTION The present invention relates to release coatings and articles coated with such release coatings. In particular, the present invention relates to coatings which retain signs (signals) or printed indications, even when in contact with a repositionable pressure sensitive adhesive.

BACKGROUND OF THE INVENTION A well-known note pad comprises a stack of paper sheets each of which has a narrow band of low adhesion pressure sensitive adhesive adjacent to one end on its back side by which the sheets can temporarily adhere to such substrates as documents or other articles (often for the purpose of containing a message), a band of adhesive by means of which the sheets remain stuck together in the notebook. In a notebook configuration, all the adhesive strips are along one side of the notebook REF: 26901 of notes, while in another configuration of * notebook, the adhesive strip on each successive sheet in the notebook is along the opposite side of the notebook as illustrated in U.S. Patent No. 4,416,392. The notebooks in both configurations are currently marketed under the "Post-it" brand by the Minnesota Minning and Manufacturing Company, St. Paul, Minnesota. A number of conventional electrophotoconductive devices such as printers and copiers employ dry inorganic pigment. These printers and / or copiers employ organic pigment to form a transferable latent image of an imaging device to a substrate such as paper, labels or label strips. The latent image of organic pigment is then subjected to thermal fusion to obtain the best printing quality and density of the organic pigment image. Although the resulting images are often of good quality, there are problems associated with the imaging processes employed by the printers and / or copiers. For example, there is the problem of background effect which is the accumulation of various undesirable materials such as organic pigment particles on the substrate. Other conventional devices for office and commercial printers use pigments containing inks or inks together with a carrier vehicle. Examples of such printing devices are inkjet, offset, flexographic, duplicating, and electrophotographic printers. The images are applied to the substrate and the vehicle is absorbed in the substrate and evaporates. Occasionally, the substrate may be subjected to heat to increase evaporation of the ink vehicle. Problems with such printers include "ghost formation", in which ink transfer to the substrate is incomplete. Typically, the residual tape is transferred to another roller in the printer and subsequently transferred to the substrate outside the register. This results in a slightly colored image. Additional problems with inkjet printers is the tendency of the ink to run off the substrate, and not to absorb into the substrate or to dry. In any case, the ink smears when a subsequent sheet comes in contact with the image. When the printed sheets are formed in notepads, a release liner is typically used to provide easy removal of the sheets from the pads. Such a release coating must be receptive to common writing instruments and printing inks (see U.S. Patent No. 5,154,962 columns 1 and 2 related background). The coating Detachable is selected to allow high quality images with specific printing technologies and easy separation of the adhesive. For a long time it has been the industrial practice for commercial printing to use offset printing devices located in centralized production facilities. Nevertheless, desktop advertising and e-commerce are rapidly changing the printing industry from centralized production with a single printing technology for decentralized production using multiple and multiple printing technologies. For example, a printing requirement may require offset printing (for example, the logo of a company) followed by xerographic personalization (for example, the name of a person). In any case, the removable coated substrate must firmly accept and retain signs and indications. The coated substrate must first accept signs or indications without "background effect" on electrophotographic devices, "ghosting" on some printers, or smearing of liquid ink printers. Additionally, when formed in blocks, the printed signs or indications must be firmly retained in the substrate without being transferred to the adhesive of the preceding note in the pad.

Coatings have been prepared to improve the receptivity of the ink to organic pigment particles. World Patent Application No. US / 90/03286 (Josephy et al.) Discloses an organic pigment receptor coating which can be applied to paper. U.S. Patent No. 5,154,962 discloses removable coatings that accept signs or indications, which are particularly useful for writing with pens containing water-based inks. However, there are no known references teaching the use of a release liner that firmly accepts and retains signs and indications of a wide array of devices including offset, inkjet and xerographic printers. Customization is often done using sheet-fed devices such as laser printers, inkjet printers, xerographic copiers. This printing is useful when preparing printed notebooks. Such pads can be prepared using the structures and methods described in U.S. Patent No. 5,382,055. Thus, there is presently a need for a release liner that accepts and retains organic pigment particles, offset inks, and other liquid inks and organic pigments.

BRIEF DESCRIPTION OF THE INVENTION The present invention comprises articles coated with release coatings that are capable of accepting and retaining signs (signs) or printed indications and still maintaining good release properties. The release liner of the present invention is coated on a substrate such as paper. The articles are of the form described in U.S. Patent No. 5,382,055 and are useful for preparing a small amount of. notes or notebooks. The release liner comprises a polymer having at least one polymeric vinyl segment having a T- of between -10 ° C and 65 ° C and at least one polymeric segment of siloxane. Preferably, the Tq should be between 200C and 450C of the vinyl polymer segment. In one embodiment of the present invention, the coating is a copolymer which comprises the formula: wherein Ri are monovalent portions which may independently be the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen and fluoroalkyl; R 2 may independently be the same or different and are divalent linking groups; R3 are monovalent portions, which may be independently the same or different and are selected from the group consisting of alkyl, aryl, alkylaryl, alkoxy, alkylamino, hydroxyl, hydrogen and fluoroalkyl; R can be independently the same or different and are divalent linking groups; x is an integer from 0 to 3; and is an integer of 10 or greater; q is an integer from 0 to 3; G5 and Ge are monovalent portions which may be independently the same or different selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, fluoroalkyl, hydrogen, and -WSA wherein W is a divalent linking group and A is it is defined later; and G2 and G4 are A wherein A is a polymeric vinyl segment or block consisting essentially of a monomer polymerizable by polymerized free radicals.

In another embodiment of the present invention, the coating comprises a copolymer of D and E monomers copolymerized to form a polymer backbone with F-monomers grafted therein, wherein: D is at least one vinyl monomer polymerizable by free radicals; E is at least one polar monomer copolymerizable with D, the amount of E is up to 30% of the total weight of all monomers, and F is a monomer having the general formula X- (Y) nSiR [3-m) Zm in which X is a vinyl group copolymerizable with the monomers D and E, Y is a divalent linking group wherein n is zero or 1; m is an integer from 1 to 3; R is hydrogen, lower alkyl (e.g., methyl, ethyl, or propyl), aryl (e.g., phenyl or substituted phenyl), or alkoxy groups; and z is a polymeric monovalent siloxane moiety having a number average molecular weight greater than about 1,000 and does not react essentially under copolymerization conditions.

The present invention also includes an article capable of receiving organic pigment comprising a coating, a release coating and a substrate such as a label mounted on the coating.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a representation of the Applicant's invention tested in accordance with the procedures described below. Figure 2 is an Avery 30-up # 5160 label representation that has been tested in accordance with the procedures described below. Figure 3 is a view from the edge of a sheet assembly according to the present invention. Figure 4 is a reduced sectional view taken approximately along line 4-4 of Figure 3.

DESCRIPTION OF THE PREFERRED MODALITIES The present invention includes an article coated with a release coating that is capable of retaining organic pigment. The release coating has at least one polymeric siloxane segment and at least one polymeric vinyl segment having a T of between -10 ° C and 65 ° C. By virtue of its composition and chemical structure and the resulting properties, the release coating is well suited to control applications that retain organic pigment. In particular, it is taught that the silicone segment exhibits a low energy, "siliconized" release strength and higher energy vinyl polymer segment that provides adhesion to the organic pigment particles. In one embodiment of the present invention, the coating is a copolymer which comprises the formula RI are monovalent portions which can be independently the same or different, which are selected from the group consisting of alkyl, aryl, alkylaryl, alkoxy, alkylamino, hydroxyl, fluoroalkyl and hydrogen. Preferably, R x are monovalent portions which can be independently the same or different selected from the group consisting of C 4 -4 alkyl and hydroxyl. More preferably, R, is selected from the group consisting of methyl and butyl. R2 are divalent linking groups which can be independently the same or different. Suitable divalent linking groups include but are not limited to the following: C 1 to Cι alkylene, arylene, alkylarylene and alkoxyalkylene. Preferably, R2 is selected from the group which consists of alkylene of d-3 and alkylarylene of C7-C? 0 due to the ease of synthesis of the compound. More preferably, R2 is selected from the group consisting of -CH2-, 1,3-propylene; Y R3 are monovalent portions, which may be independently the same or different, which are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl and fluoroalkyl, and hydrogen. Preferably, R3 are monovalent portions which may be independently the same or different selected from the group consisting of d-4 alkyl and hydroxyl. More preferably, R3 is selected from the group consisting of methyl and butyl. R4 are divalent linking groups which can independently be the same or different. Suitable divalent linking groups include but are not limited to the following: C 1 to Cι alkylene, arylene, alkylarylene and alkoxyalkylene. Preferably, R4 is selected from the group consisting of C? -3 alkylene and C7-C10 alkylene for reasons of ease of synthesis. More preferably, R4 is selected from the group consisting of -CH2-; 1,3-propylene; Y CH2 Q \ -CH_CH_ Gs and G6 are monovalent portions which can be independently the same or different selected from the group consisting of alkyl, aryl, alkylaryl, alkoxy, alkylamino, fluoroalkyl, hydrogen, and -WSA wherein W is a divalent linking group and A is it is defined later. W are divalent linking groups. Divalent linking groups include, but are not limited to C 1 to Cι alkylene, alkylarylene, arylene, and alkoxyalkylene. Preferably, W is selected from the group consisting of methylene and propylene. G2 and G4 are the same or different and A. A is a polymeric vinyl segment consisting essentially of polymerized free radical polymerizable monomer. A may comprise either a homopolymeric segment or block or a copolymeric segment or block. The organic pigment retention properties of the coating are determined by the content of the polymeric vinyl segment. The nature or chemical composition of the vinyl polymer segments can be modified independently of the release aspect to improve retention of the organic pigment and adhesion to the substrate. In this way, the release liner can be chemically designed to provide a specific level of organic pigment retention. The selection of the composition of A is typically based on the intended use of the release liner and the properties may be the release liner to achieve its intended purpose. A may include, but is not limited to, those monomers wherein the monomer or monomers free radical polymerizable are chosen such that a vinyl segment has a Tq or Tm greater than -20 ° C. Preferred free radical polymerizable monomers are selected from the group consisting of styrene, methyl methacrylate, methyl acrylate, acrylic acid, methacrylic acid, acrylonitrile, isobornyl acrylate, isobornyl methacrylate, N-vinyl pyrrolidone, butyl methacrylate, methacrylate. of isopropyl, vinyl acetate, hydroxy propyl acrylate, hydroxy ethyl acrylate and mixtures thereof. The amount and composition of the vinyl to silicone segment should range from about 98 to about 2 parts, preferably from about 40 to about 60 parts by weight. It is preferred that the polymeric vinyl segments have a molecular weight in the range of 2,000 to 80,000, more preferably 5,000 to 50,000. The release properties of the coating are determined both by the silicone content (weight percent) present in the copolymer and the molecular weight of the silicone segment, with higher silicone content and / or which provides easier detachment. A copolymer or copolymer mixture can, therefore, be chemically designed to provide a specific level of release that can be reproduced with consistency, thereby making it possible to vary the release properties of a coating over a range of values in a controlled manner . The polymeric silicone segment must have an average molecular weight greater than about 1000 for the release liner to function properly. Preferably, the polymeric silicone segment has a number average molecular weight of from about 1000 to about 20,000. More preferably, the polymeric silicone segment has a number average molecular weight ranging from about 2,000 to about 15,000. The polymeric silicone segment can comprise from about 2 to 60% by weight of release coating to allow a wide range of release performance. In another embodiment of the present invention, the release coating comprises a copolymer of monomers D and E copolymerized to form a polymer backbone. Grafted to the skeleton is a monomer F. Monomers D and E provide the properties of Retention of organic pigment from the coating and monomer F provides the release properties. The monomer or monomers D (there may be more than one) are chosen so that the Tg or Tm of the backbone is greater than about -20 ° C. Representative examples of monomers D include styrene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile and esters of acrylic or methacrylic acid of non-tertiary alcohols or tertiary alcohols such as methanol, ethanol, propanol, isopropanol, butanol, isobutanol, cyclohexanol, benzyl alcohol, dodecanol, hexadecanol and octadecanol, alcohols having 1 to 18 carbon atoms. Especially preferred monomers D include methyl methacrylate, butyl methacrylate, vinyl acetate, partially hydrolyzed vinyl acetate, methyl acrylate and octadecyl acrylate. Representative monomers E useful in the practice of the invention, and which may be used either individually or in combination, include carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid and 2-carboxyethyl acrylate and its ammonium or metal salts; sulfonic or phosphoric acids such as 2-sulfoethyl methacrylate, 3-sulfopropyl acrylate, 3-sulfopropyl methacrylate, styrene sulfonic acid, and vinyl benzyl phosphoric acid and its ammonium or metal salts; amides such as acrylamide, methacrylamide, N, N-dimethyl acrylamide, and N-pyrrolidone; and monomers having hydroxyl functionality (eg, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, and dihydroxypropyl acrylate), ammonium functionality derived from the reaction of amine-containing monomers (eg, N-methacrylate, N-dimethylaminoethyl and vinyl pyridine) with alkylating agents or protic acid, or zwitterionic functionality such as that derived by the reaction of amine monomers with hydrogen peroxide or propan sulfone. The monomer F has the general formula: X- (Y) nSiR (3-p) Z in which X is a vinyl group copolymerizable with the monomers D and E. Y is a divalent linking group. R comprises hydrogen, lower alkyl groups such as methyl, ethyl, or propyl, aryl groups such as phenyl or substituted phenyl, and alkoxy groups such as the methoxy and ethoxy groups. Z is a polymeric monovalent siloxane portion having a number average molecular weight greater than 1,000 and does not react essentially under the conditions of copolymerization.

The preferred monomer F can be further defined as that having a group X which has the general formula R1 R2 CH- = C- wherein R 1 is a hydrogen atom or a COOH group and R 2 is a hydrogen atom, a methyl group, or a CH 2 COOH group. The group Z of monomer F has the general formula wherein R3 and R5 are independently lower alkyl, aryl, or fluoroalkyl, wherein lower alkyl and fluoroalkyl both refer to alkyl groups having both of one to three carbon atoms, wherein aryl refers to phenyl or substituted phenyl. R 4 may be alkyl, alkoxy, alkylamino, aryl, hydroxyl, or fluoroalkyl, and r is an integer from about 5 to about 700. Preferably, monomer F has a general formula selected from the group consisting of the following, wherein m is 1, 2 or 3, p is zero or 1, R "can be alkyl or hydrogen, and X, R and Z are as defined above: where q is an integer from 2 to 6; Ao-Q - (CH2) q- (0) p-Si (R) j.mZm where q is an integer from zero to 2; where q is an integer from 2 to 6; x-Lc - ^ - c *, _iJ-Í - ^^ V-S¡ (R) 3.mZm wherein q is an integer from 2 to 6. The release liner of the present invention may comprise the copolymers of the two modalities alone, or may comprise copolymers blended with other compatible homopolymers and / or copolymers. The percentage of silicone contained in the copolymers makes the copolymers easily compatible with the polymers of similar composition with the Polymeric vinyl blocks or segments. In addition, there are several pairs of different polymers that produce compatible mixtures due to the specific interaction as described by S. Krause in Polymer Blends, Academic Press, New York, 1978. The introduction of a low level of silicone block in one of these polymers will have no influence on compatibility. In addition, of course, additives, fillers or pigments such as alumina, silica, titanate, or calcium carbonate can be added to the copolymer compositions. The release liner of the present invention should provide sufficient traction fixation to retain at least 50% of the organic pigment. It should be understood that "substantially" means at levels of at least 50%. More preferably, it should retain at least 70% of the organic pigment. In addition, the release liner should have a surface release value of no greater than about 10 oz / in (11 N / dm). It should be understood that this upper limit applies to use with highly aggressive pressure sensitive adhesives (PSA) which have adhesion values of 45 N / dm or higher. ASPs as a group fall into three broad categories of adhesion ranges (1) low (5-15 N / dm), (2) intermediate (25-50 N / dm), and (3) high (60-over 100). N / dm). It is evident that the degree of detachment can be selected so that it adjusts to the aggressiveness of the ASP with which will be in contact and it is only for the most aggressive ASPs that a release value as high as 10 oz / in (11 N / dm) could be selected. Removable coatings that are correspondingly less for less aggressive ASPs could be selected. The release compositions do not require curing or crosslinking, however, if resistance to solvents is desired for the particular application, the crosslinking can be carried out by standard methods known in the art, such as radiation curing (electron beam or light). ultraviolet) or chemical crosslinking. The release coating compositions can be applied to any support or coating by means of conventional coating techniques such as a wire wound roll, direct engraving, offset engraving, inverted roll, air knife, and back knife coating. Suitable coatings include paper, non-woven fabrics and thermoplastic resin films, such as polyesters, polyamides, polyolefins, polycarbonates and polyvinyl chloride. In addition, any substrate that can be applied to a coating by a pressure sensitive adhesive can be used. For example, paper is a suitable substrate.

In a preferred embodiment, the release liner of the present invention is used as a component of a label strip. In this preferred embodiment, one or more non-continuous substrates such as labels adhere to a protective coating by means of a suitable adhesive. To allow the substrate to be removed from the coating, the release coating of the present invention is coated on the coating. A particularly useful configuration is a sheet assembly, where the assembly can be as described below and with reference to Figures 3 and 4. The sheet assembly 10 is illustrated with the release liner 40 over at least one support area non-adhesive of the back surfaces 15 of the sheets 12 and 13. The removable coverings 40 can be applied in strips and are slightly wider than the adhesive strips 16, and extend transversely to the sheets 12 and 13 parallel to the edges 30. , 36 and 37 with each peel-off coating in band 40 being adjacent and extending along an edge of a portion 34 of sheet 12 and 13 that will be formed by separating sheets 12 and 13 along weakness paths 31 and 33 and in a position such that the back surfaces 15 of the sheets are placed face to face as illustrated in Figure 3, the web layers 16 of the adhesive will come into contact and will generally be centered on the strip-like coverings 40. Also, as illustrated, the entire front surface 14 of each of the sheets 12 and 13 is coated with a release liner 41, although such coating is not necessarily required. For example, the peelable coatings illustrated on the back surfaces 15 and the peel-away coatings 41 on the front surface 14 of the sheets 12 and 13 are not necessary when the adhesive layer 16 is of low adhesion or repositionable adhesive (e.g. low adhesion adhesives based on the adhesive, elastomeric copolymer microspheres described in US Patent Nos. 3,961,140 and 3,857,731). The use of removable coatings 40 and 41 allows the use of layers 16 of pressure sensitive adhesive that are more aggressive or permanent than repositionable adhesives. Suitable release coatings 40 and 41 are materials and treatments of the present invention. Even with the layers 16 of aggressive pressure-sensitive adhesive, the release coatings 40 and 41 may not be required if the sheets 12 and 13 are made of a material, or are impregnated with the release material, of which the adhesive layer 16 is peeled off. easily. Although Figures 3 and 4 represent a particular configuration of a blade assembly, such illustrations and descriptions are merely illustrative of the present invention and other embodiments could be contemplated within the scope of this invention. The following examples are illustrative of nature and are not intended to limit the invention in any way.

TEST SAMPLES The polymer solutions of Examples 1 to 19 discussed below were diluted to 15% solids in distilled water. The solutions were then coated on commercially available roll paper with an engraving roll having a pyramidal pattern of 200 cells per inch. Two coatings of direct engraving with roller were applied to each sample. Two different rolled papers were used. The supercalendered ClS paper distributed by Simpson Paper Company was coated with the diluted polymer solutions of Examples 1 to 4 and the machine-satin paper sold by Akrosil was coated with the polymer solutions of Examples 4 to 19. After coating, the papers They were dried at 77C.

Test Methods Detachment Properties The detachment property of an adhesive refers to the ease with which an adhesive separates from another surface. This is the force required to remove a flexible adhesive tape to a test sample at a specific angle and speed of removal. It is measured in Newtons per decimeter (N / dm). Two test methods were used to evaluate the detachment and retention properties of signs or indications of the coated flexible sheet materials. Both tests are modified versions of the industrial standard adhesion test ASTM D3330-78 PSTC 1 and 3 used to evaluate materials coated with ASP. The two modified detachment property tests are described below. 1. Detachment Value Each test sample was conditioned overnight at constant temperature (22 ° C) and humidity (50% RH).

Therefore, a 5.08 cm by 25.4 cm strip of the test sample was laminated to an assembly with a constant 90 ° angle commercially available as Deltron Ball Slide from J.R.

Brass Co. of Eden Prairie, MN with double coated tape. A 2.54 cm strip of a test tape coated with ASP (tape # 810, commercially available from the beneficiary of this application) was then coated on the sheet with a 1.82 kg rubber roller. The force required to remove this tape at 90 ° and 30.5 cm / minute was then measured by a Sintech / Instron Traction Tester System commercially available from Sintech Corporation, a division of MTS Systems Corporation, Research Triangle Park, North Carolina. 2. Organic Pigment Receptivity Test The organic pigment receptivity of the test samples was evaluated by printing on a 21.6 cm x 27.9 cm test sample a pattern of asterisks (****), on a LaserJet II printer from Hewlett Packard. The leaves coated with the image then placed overnight in a controlled environment of 21 ° C and 50% RH. Subsequently, the strip of 2.54 cm x 25.4 cm ScotchMK tape Brand 810MR manufactured by Minnesota Mining and Manufacturing Company was compressed with a roller over the test samples with the image using two passes of a 1.82 kg rubber roller. After the two passes, the samples were allowed to stand in a controlled environment of 21JC and a 50% RH for 24 hours. Next the Scotch tape was laminated * * Mark 810MR from the image side upward of the TIMI Removal and Adhesion Tester stage sold by Testing Machines Inc. of Mityville, New York with double coated tape The 810MR tape was then removed at a peel angle of 180 ° C at 3048 cm / minute Image analysis was used to determine the amount of signs or indications that remained anchored to the coated sheet.

Abbreviations AA - acrylic acid AIBN-2-21-azobisbutyronitrile BMA - butyl methacrylate EMA - ethyl methacrylate IPA - isopropyl alcohol KF2001 - a mercaptofunctional dimethyl siloxane with 4-5 mol% of mercapto functionality commercially available from Shin-Etsu MA - methacrylic acid MAA - methyl acrylate MEK - methyl ethyl ketone MMA - methyl methacrylate ODA - octadecyl acrylate Example 1 The composition of Example 1 was prepared as follows: First, a sample containing solvent was prepared by charging a 32-ounce reaction vessel with 45 grams of mercaptofunctional dimethyl siloxane with 4-5 moles of mercapto functionality commercially available as KF-2001 of Shin-Etsu, 169 grams of methyl acrylate, 11 grams of acrylic acid, 335 grams of methyl ethyl ketone (MEK) and 0.56 grams of 2-2 '-azobisisobutyronitrile (AIBN). The mixture in solution was then purged with nitrogen for 2 minutes at a rate of 1 L / min, after which the bottle was sealed. The sealed bottle containing the clear solution was stirred in a constant temperature bath for 20 hours at 55 ° C resulting in a white, cloudy, viscous solution. Subsequently, a solution containing water was prepared by filling a one-gallon container with 860 grams of deionized water (DI) and 9 grams of NH4OH. Next, 537 grams of solvent-containing solution (40.0% solids) was added to the solution in the one-gallon container. The resulting solution was placed on a shaker and stirred for half an hour to complete the neutralization. The MEK was then separated from the solution viscous resulting in a rotary evaporator at 40 ° C using a vacuum aspirator to give an aqueous solution with 19.0% solids. An additional amount of DI was added to obtain the solution with 15.0% solids. The ingredients used to form a solution with solvent and a solution with water and the ingredients used are reported in Tables 1 and 2 respectively. The ingredients of the release coating, the percentage by weight of the ingredients and the test results are reported in Table 3.

Examples 2-20 The copolymers of Examples 2-20 were prepared according to the procedure set forth in Example 1. The ingredients used to form a solution with solvent and a solution with water and the amount of ingredients used are reported in Tables 1 and 2 respectively. The ingredients of the release coating, the percentage by weight of the ingredients and the test results are reported in Table 3.

TABLE I TABLE 2 TABLE 2 (continued) The polymer is the product of the reaction of KF2001, MA and AA and / or MAA or MMA Table 3 Table 3 (continued) A = Acrylic B = Rubber Example 21 The composition of Example 21 was prepared as follows: First, a sample containing solvent was prepared by charging a 4-ounce glass container with 4 grams of 15K silicone macromer (SiMac), the preparation of which is described in FIG. U.S. Patent No. 7,728,871, 16 grams of ethyl methacrylate (EMA), 30 grams of methyl ethyl ketone (MEK) and 0.06 g of 2-2'-azobisbutyronitrile (AIBN). Subsequently, the contents of the bottle were purged with nitrogen gas for two minutes. The bottle was then sealed and shaken in a 55 ° C water bath for 48 hours. The sample was then diluted to 10% solids for the coating. 40 grams of polymer solution at 40% solids, 96 grams of toluene and 24 grams of isopropanol (IPA) were added to a 16-ounce wide-mouthed container. The mixture was then stirred to form a homogeneous mixture. The ingredients used to form the solution containing the solvent and the amount of the ingredients used are reported in Tables 4 and 5, respectively. The ingredients of the release coating, the percentage by weight of the ingredients and the test results are reported in Table 6.

Examples 22-27 The copolymers of Examples 22-27 were prepared according to the procedure set forth in Example 21. The ingredients used to form a solution with solvent and the amount of ingredients used are reported in Tables 4 and 5, respectively.

TABLE 4 TABLE 5 Ingredients Used Quantity of Ingredients in the Preparation of the Used (gms.) Solution Containing Water 21 Polymer / toluene / IPA 40/96/24 22 Polymer / toluene / IPA 40/96/24 23 Polymer / toluene / IPA 40/96 / 24 24 Polymer / toluene / IPA 40/96/24 25 Polymer / toluene / IA 40/96/24 26 Polymer / toluene / IPA 40/96/24 27 Polymer / toluene / IPA 40/96/24 The polymer is the product of the reaction of the components listed in Table 5 for each example.

TABLE 6 A = Acrylic Example 28 A sheet assembly was made particularly adapted to be printed on both sides in the types of printers described above, which had the structure illustrated in Figure 1, except that four were placed in place of two layers 16 of pressure sensitive adhesive in separate relationship on each sheet 12 and 13. The sheets 12 and 13 were each of 20 lb. bond paper and were each eight and a half inches by 11 inches in size, with the sheet 13 being slightly longer, so which was projected approximately 0.1 inches beyond the edge 37. The layers 16 of pressure-sensitive adhesive were the microspherically structured copolymer adhesive described in US Pat. No. 3,691,140 (Silver) dispersed in n-heptane at 8% solids. The release liner layers 40 were crosslinked with Syl Off 7676 coated at 20% solids in 2-butane. The paper was first printed with a vinyl solution containing zinc oxide. The release coating 41 was a polymer described in Example 1 of USSN 08/040876, except that the composition was KF2001 / MA / MAA / MMA25 / 50/20/5 dispersed in 2-butanone (Example 20) at 1.5% of solid The adhesive was coated to provide an adhesion comparable to that of the Post-it notes (ie, an adhesion to the glass of about 0.6 N / dm) in strips 0.75 inches (1.9 cm) wide that extended the full width of the sheets 12 and 13. The opposite strip of release liner 40 was coated with an engraving cylinder to provide 1.25 strips inches (3.2 cm) wide that extended across the width of leaves 12 and 13. The materials were coated on a wide web and subsequently converted and bent to form the 10 sheet assemblies. The initial release of the sheet was 166 g / inch. Subsequently, the sheets were printed using ink jet, xerographic and offset printers. In each case, the test pattern was a solid block of ink or black organic pigment. The ink jet printer was a HP 1200C color inkjet printer commercially available from Hewlett-Packard, Palo Alto, CA. The xerographic printer was a Lanier 6540 copier commercially available from Lanier orldwide, Inc., Atlanta, GA. The percentages of sign receptivity or indications were as follows: HP 1200 C 100 percent Lanier 6540 92 percent Test results indicate that the release liner of the present invention retains indications much more effectively than peel coatings used in the Comparative Examples. Visually, a comparison of Figures 1 and 2 is observed where the samples were tested according to the Organic Pigment Receptivity Test described above. The pattern of asterisks in Figure 2 was not retained substantially compared to the peel-off coating of the applicant shown in Figure 1. The composition of the applicant used in Figure 1 comprises MA / MAA / MMA / KF2001 in the following quantities 50/5 / 20/25. Thus, the coating of the present invention significantly decreased the problems attendant associated with the signs and indications when they were printed and subsequently used as a stack of pressure-sensitive notes. In summary, a novel coated article with a removable coating technique capable of receiving unique organic pigment was described. Although the specific embodiments and examples of the present invention have been described herein, it should be kept in mind that these are by way of explanation and illustration and the present invention is not limited thereto. Certainly, modifications that are within the common skills of the art are considered within the scope of this invention as defined in the following claims including all their equivalents. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the one that resulted clear from the present description of the invention. Having described the invention as above, property is claimed as contained in the following:

Claims (12)

1. A releasable coating capable of receiving particles emitted by electrophoretic devices, characterized in that it comprises a polymer having at least one polymeric vinyl segment having a Tg of between -10 ° C and 65 ° C and at least one polymeric segment of siloxane wherein the release liner is capable of substantially retaining the particles therein.

2. The release liner according to claim 1, characterized in that the polymer is a copolymer comprising the formula: wherein Ri are monovalent portions which may be independently the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl; R 2 may independently be the same or different and are divalent linking groups; R3 are monovalent portions which may be independently the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl; R4 can independently be the same or different and are divalent linking groups; x is an integer of 0-3; and is an integer of 10 or greater; q is an integer of 0-3; and G5 are monovalent portions which may be independently the same or different selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, fluoroalkyl, hydrogen, and -WSA; A is a polymer segment or block of vinyl consisting essentially of monomer polymerized by polymerized free radicals. G6 are monovalent portions which may be independently the same or different selected from the group consisting of alkyl, aryl, alkoxy, alkylamino, fluoroalkyl, hydrogen and -WSA; and G2 and G are A.

3. The release liner according to claim 1, characterized in that the polymer is a copolymer of monomers D and E copolymerized to form a polymer backbone with F-monomer grafted therein: D is at least one vinyl monomer polymerizable by free radicals; E is at least one polar monomer copolymerizable with D, the amount of E is up to 30% the total weight of all monomers, and F is a monomer having the general formula: X- (Y) nSiR (3-ra) Zm wherein X is a vinyl group copolymerizable with the monomers D and E, Y is a divalent linking group wherein n is zero or 1; m is an integer from 1 to 3; R is hydrogen, lower alkyl (e.g., methyl, ethyl or propyl), aryl (e.g., phenyl or substituted phenyl), or alkoxy; and Z is a polymer portion of monovalent siloxane having a number average molecular weight greater than 1,000 and essentially does not react under the copolymerization conditions.

4. The release liner according to claim 3, characterized in that the monomer D is selected from the group consisting of styrene, vinyl, vinyl chloride, vinylidene chloride, acrylonitrile, esters of acrylic or methacrylic acid of non-tertiary alcohols and tertiary alcohols having from 1 to 18 carbon atoms and mixtures thereof.

5. The release liner according to claim 3, characterized in that the monomer E is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, acrylamide, methacrylamide, N, N-dimethylacrylamide, methacrylonitrile and maleic anhydride.

6. An article capable of receiving images, characterized in that it comprises: (a) a coating having a front face and a back face; (b) a release coating layer coated on a portion of the front face of a coating wherein the release coating comprises a polymer having at least one polymeric vinyl segment having a Tg of between -10 ° C and 65 ° C present at one percent by weight large enough to provide the copolymer with the ability to substantially retain organic pigment particles emitted by an electrophotoconductor device and at least one polymeric siloxane segment having an average molecular weight number greater than 100 and present at one percent by weight large enough to provide the copolymer with a surface release value of no greater than about 11 Newtons / dm; (c) a layer of adhesive sen. ible to pressure; and (d) at least one substrate layer having a front face and a back face.

7. The article capable of receiving images according to claim 6, characterized in that the polymer of the release coating is a copolymer comprising the formula: wherein Ri are monovalent portions which may be independently the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl; R 2 may independently be the same or different and are divalent linking groups; R3 are monovalent portions which may be independently the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl; R4 can independently be the same or different and are divalent linking groups; x is an integer of 0-3; and is an integer of 10 or greater; q is an integer of 0-3; and G5 are monovalent portions which may be independently the same or different selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, fluoroalkyl, hydrogen, and -WSA; A is a polymer segment or block of vinyl consisting essentially of monomer polymerized by free radicals polimerizados. G6 are monovalent portions which can be independently the same or different from the group consisting of alkyl, aryl, alkoxy, alkylamino, fluoroalkyl, hydrogen and -WSA; and G2 and G4 are A.

8. The article capable of receiving images according to claim 6, characterized in that the The polymer of the release coating is a copolymer of monomers D and E copolymerized to form a polymer backbone with F-monomer grafted thereto: D is at least one vinyl monomer polymerizable by free radicals; E is at least one polar monomer copolymerizable with D, the amount of E is up to 30% of the total weight of all monomers, and F is a monomer having the general formula: X- (Y) -SiR (3-m) ) Zm wherein X is a vinyl group copolymerizable with monomers D and E, Y is a divalent linking group wherein n is zero or 1; m is an integer from 1 to 3; R is hydrogen, lower alkyl (e.g., methyl, ethyl or propyl), aryl (e.g., phenyl or substituted phenyl), or alkoxy; and Z is a polymer portion of monovalent siloxane having a number average molecular weight greater than 1,000 and essentially does not react under the copolymerization conditions.

9. The article capable of receiving images according to claim 8, characterized in that the monomer D of the polymer of the release coating is selected from the group consisting of styrene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, esters of acrylic or methacrylic acid of non-tertiary alcohols having from 1 to 18 carbon atoms and mixtures thereof.

10. The article capable of receiving images according to claim 8, characterized in that the monomer E of the release polymer is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, acrylamide, methacrylamide, N, N-dimethylacrylamide, methacrylonitrile and malefic anhydride.

11. The article capable of receiving images according to claim 6, characterized in that the substrate is a strip of labels. % •

12. A sheet assembly, characterized in that it comprises a release liner "Obre at least one area that does not contain adhesive from the back surfaces of a sheet, wherein the release liner comprises the formula: ( wherein Ri are monovalent portions which may be independently the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl; R 2 may independently be the same or different and are divalent linking groups; R3 are monovalent portions which may be independently the same or different and are selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, hydroxyl, hydrogen, and fluoroalkyl; R4 can be independently the same or different and are divalent linking groups; x is an integer of 0-3; and is an integer of 10 or greater; q is an integer of 0-3; and G5 are monovalent portions which may be independently the same or different selected from the group consisting of alkyl, aryl, alkaryl, alkoxy, alkylamino, fluoroalkyl, hydrogen, and -WSA; A is a polymer segment or block of vinyl consisting essentially of monomer polymerized by polymerized free radicals. Ge are monovalent portions which can be independently the same or different selected from the group consisting of alkyl, aryl, alkoxy, alkylamino, fluoroalkyl, hydrogen and -WSA; and G2 and G are A.