Abstract: The present invention relates to a composite material obtained by in situ polymerization of a thermoplastic resin with a fibrous material. More particularly the present invention relates to a polymeric composite material obtained by in-situ polymerization of a thermoplastic (meth) acrylic resin and a fibrous material containing long fibers and its use, a process for making such a composite material and manufactured mechanical or structured part or article comprising this polymeric composite material.

Abstract: Provided is a water-dispersible acrylic pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that is superior in adhesive properties, antistatic properties, removability, the ability to prevent an increase in peel strength (adhesive strength) over time, and superior in less-staining properties on adherends, particularly, in the ability to prevent white staining on adherends in a high-humidity environment (the ability to prevent white staining), and also superior in appearance properties. The invention is directed to a water-dispersible acrylic pressure-sensitive adhesive composition, including: an acrylic emulsion polymer including 70 to 99.5% by weight of a monomer unit derived from an alkyl (meth)acrylate and 0.

Abstract: Waterborne primer coating compositions are applied to sheet metal substrates and rapidly cured. The primer coating compositions contain water, a latex resin and corrosion-inhibiting particles. The primer coating compositions may be applied to the metal sheets and rapidly cured at a rolling mill, followed by coiling of the coated sheets.

Abstract: A transparent electric-arc resistant composition is produced by preparing crystalline tungsten bronze nanoparticles and homogenously dispersing the nanoparticles in a transparent plastic matrix. The crystalline tungsten bronze nanoparticles are prepared by homogeneously mixing an aqueous solution of soluble tungsten and cesium salts and then drying the solution. The dried solution is then heated in a reducing gas or inert gas atmosphere to form crystalline tungsten bronze nanoparticles. Thereafter, a dispersion agent is added and the nanoparticles are dispersed in a liquid solvent medium by wet milling to form a dispersion mixture. The dispersion mixture is then mixed with polymer pellets to form a polymer mixture, and the polymer mixture is then extruded to yield polymer pellets containing highly homogeneously dispersed inorganic nanoparticles. During or after dispersion, additional particles, dyes, heat stabilizers or UV absorbers, may be added. A lens or shield is then molded from the polymer pellets.

Abstract: There is provided an optical film including an acrylic resin, wherein a tensile elastic modulus in a machine direction, which are abbreviated as EMD, and a tensile elastic modulus in a direction perpendicular to the machine direction, which is abbreviated as ETD, satisfy the relationship of Equation (1): EMD/ETD<0.8??Equation (1).

Abstract: The present invention relates to a new and efficient toxicity and/or odor reducing method for ethyl acrylate and/or acrylonitrile contained aqueous polymer dispersion.

Abstract: Provided is a removable acrylic pressure sensitive adhesive comprising (A) 70-96.5 weight % of (meth)acrylic acid ester monomer having C1-C14 alkyl group; (B) 0.5-27 weight % of one or more functional group containing monomers selected from the group consisting of carboxyl group containing monomer, hydroxyl group containing monomer, epoxy group containing monomer, vinyl ester group containing monomer and cyano group containing monomer; and (C) 0.6-3 weight % of a cross linking agent having 5-13 alkylene oxide groups and acrylate group or vinyl group in 100 weight % of the monomers and the cross linking agent, and the adhesive of the present invention is a water based adhesive and pro-environmental, and demonstrates excellent adhesiveness at room temperature and under aging atmosphere and excellent dimensional stability as well, so that it can be widely used for various pressure sensitive adhesive sheets for outdoor/indoor advertisement, automobile, printing, decorating, etc.

Abstract: Solid additive particles are added to solid vinylidene chloride (VDC) polymer particles by a process comprising the steps of: A. Polymerizing VDC monomer, optionally with one or more mono-ethylenically unsaturated comonomers, in a polymerization zone under polymerization conditions to form solid VDC polymer particles; B. Stopping the polymerization of the VDC monomers after formation of the solid VDC polymer particles; and C. Contacting the solid VDC polymer particles with the solid additive particles (i) before the solid VDC polymer particles are de-watered, and (ii) at a temperature sufficient to melt or soften the solid additives particles but insufficient to melt or soften the solid VDC polymer particles such that the melted or softened solid additive particles adhere to the solid VDC polymer particles upon contact.

Abstract: The invention provides a continuous process for producing polymer-shell nanoparticles, especially in the form of aqueous dispersions, using a high-pressure homogenizer.

Abstract: The invention provides materials and methods for forming coatings on substrates. The coatings are durable and resistant to damage from environmental, chemical, thermal, and/or radiative sources. In some embodiments, the coatings comprise bilayers of electrostatically charged materials. The bilayers are created by alternately applying solutions comprising water-soluble, electrostatically charged materials. Durability is imparted to the coatings by the formation of crosslinks that are formed within and between layers after deposition of the coatings.

Abstract: A method is provided for producing colored molded bodies based on the following steps: (a) plasticising a polymeric material and blending the material with one or more dyes to form a molding compound by means of a gelation unit equipped with a metering apparatus for dyes; (b) optionally temporarily storing the molding compound obtained in step (a); (c) charging a molding device with the molding compound; and (d) producing the molded body; wherein the ratio of dye to polymeric material is automatically regulated using a colorimeter and an electronic control, and in step (a) color values are measured at the molding compound located in the gelation unit and transmitted as a signal to the electronic control.

Abstract: A UV-shielding coating composition comprises (A) a dispersion in a dispersing medium of composite zinc oxide nanoparticles which are obtained by coating surfaces of zinc oxide nanoparticles with an oxide or hydroxide of Al, Si, Zr and Sn, the dispersion having a photocatalytic degradability of up to 25%, (B) a vinyl copolymer obtained from copolymerization of an alkoxysilyl-containing vinyl monomer, a UV-absorbing vinyl monomer, and another monomer, and (C) a solvent. The composition is transparent to visible light, UV-shielding, mar resistant, weatherable, and durable.

Abstract: Acetoacetate-functional monomers are disclosed that correspond to the following formula 1: in which R is hydrogen, or a methylgroup; X is a branched alkyl or a branched cyclic alkyl having from 5 to 8 carbon atoms; and Y1 and Y2 are independently hydrogen or methyl. Also disclosed are emulsion, suspension, and solution polymers comprising residues from the acetoacetate-functional monomer of formula 1 and one or more additional ethylenically unsaturated monomers. Self-curing coating compositions are likewise disclosed that comprise the acetoacetate-functional monomer of formula 1, and optionally one or more additional ethylenically unsaturated monomers. Latex formulations are also disclosed that comprise a polymer having residues from the acetoacetate-functional monomer of formula 1 dispersed in an evaporable aqueous carrier.

Abstract: Substituted 3-oxopentanoates are disclosed that correspond to the following formula 1: in which R is hydrogen, or a methyl group; X is a straight-chain, branched, or cyclic alkyl or alkyl ether group having from 1 to 15 carbon atoms or aromatic group having from 6 to 15 carbon atoms; and Y1 and Y2 are independently hydrogen or an alkyl having 1 to 2 carbon atoms. Also disclosed are emulsion polymers, suspension polymers, and solution polymers that comprise residues from the substituted 3-oxopentanoate monomers, and that may also include one or more additional ethylenically unsaturated monomers. Also disclosed are coating compositions that include a latex emulsion polymer and the substituted 3-oxopentanoate monomer of formula 1 provided as a coalescent.

Abstract: A process for the synthesis of a diene copolymer comprising at least two blocks, at least one of the blocks being composed of a diene elastomer, characterized in that it comprises a stage of 1,3-dipolar reaction of two polymers defined as being: a) a diene elastomer bearing an alkyne functional group at one or each of its chain ends, and b) a polymer bearing at least one azide functional group. This process of synthesis can be adjusted, whatever the nature of the monomers necessary to form each of the blocks of the copolymer. Each block can be synthesized with an appropriate chemistry, independently of the other block.

Abstract: The use of a mixture of 5-pyrimidinol derivatives with sterically hindered phenol derivatives for adjusting the reactivity and the gel time of resin mixtures and reactive resin mortars based on radically polymerizable compounds is described. Furthermore, a resin mixture containing the inhibitor combination, a reactive resin mortar containing this resin mixture and two-component mortar systems with the reactive resin mortar according to the invention and a hardener with improved stability in storage and good low-temperature hardening properties are also described. The resin mixture according to the invention is suitable in particular for chemical fastening of construction elements in boreholes in various substrates.

Abstract: The present disclosure provides pre-treatment compositions and related methods. As such, a pre-treatment coating for a print medium can include an evaporable solvent, a matrix, and a wax. The matrix can include from 50 wt % to 80 wt % of a fixer and from 5 wt % to 20 wt % of a low Tg latex. The wax can be present at from 5 wt % to 30 wt %. The weight percentages of the matrix and the wax are based on a total amount present in the pre-treatment coating after removal of the solvent.

Abstract: The invention relates to an adhesive composition, including: 10 to 95% of a moisture cross-linkable polymer (A), the main chain includes 2 silyl terminal groupings, each of which includes at least one hydrolyzable group bonded to the silicon atom; 1 to 60% of a mineral filler (B) in the form of particles having a size of between 1 nm and 0.2 mm; and 0.2 to 7% of a crosslinking catalyst (C) consisting of titanium tetraisopropoxide. The invention also relates to the use of said composition as glue for repair or attachment.

Abstract: A finish for cellulosic fibrous substrates containing tertiary amine-containing polymers for providing durable control of body odors and the cellulosic materials treated with the finish, which materials exhibit little or no discoloration and little or no degradation of physical strength as a result of the treatment.

Abstract: A paint for spraying on bamboo products, such as on the exterior surface of a slim tube-shaped bamboo product, is a nonaqueous acrylic-based paint including 10 to 15 percent by weight of one or more flatting powders, 50 to 55 percent by weight of one or more acrylic resins, 1 to 5 percent by weight of one or more leveling agents, 13 to 16 percent by weight of one or more ester solvents, 10 to 15 percent by weight of one or more alcohol solvents, and 8 to 10 percent by weight of one or more ether solvents. After application of the wet paint composition, the solvents evaporate leaving a film of the acrylic resins, flatting powders, and leveling agents.

Abstract: A method for making a pigment dispersion can include dispersing pigment particles in an aqueous liquid medium to form a dispersion, adding a first monomer to form a dispersive coating on the pigment particles, adding a second monomer to the dispersion, and forming a polymer coating on the surface of the pigment particles by polymerizing the second monomer with the first monomer, wherein the polymer coating includes at least one urethane linkage or urea linkage.

Abstract: A protective dressing composition which imparts a lustrous and glossy appearance to a flexible or elastic rubber or plastic surface includes water, silicone fluid, a polymeric acrylic emulsifier to hold the silicone fluid in dispersion in the water and a UV stabilizer. Further, the composition is substantially free of nonpolymeric surfactants. The coating does not exhibit stickiness, attract dust or other contaminants, and resist cracking and peeling. The composition provides of a shiny protective coating suitable for application to metal, plastic, wood, and painted surfaces, and is especially well suited for use on flexible substrates such as automotive tires, bumpers, rubber, trim, vinyl, and the like. The coating maintains the flexibility of the coating at low temperatures and reduces and/or eliminates the tacky property on the surface. The acrylic polymer emulsifier does not re-emulsify with rain (water) providing a durable protective coating.

Abstract: The present disclosure provides methods and composition directed towards a single batch latex ink-jet ink. In one embodiment, a method of manufacturing a single batch latex ink-jet ink can comprise emulsifying a pigment and a monomer in a solvent, and polymerizing the monomer with a reaction condition sufficient to encapsulate the pigment and sufficient to form individual latex particulates thereby forming a single batch latex ink-jet ink. The ink can contain less than about 0.5 wt % of latex particulates having a diameter of 50 nm or less, can contain about 1 wt % to about 10 wt % of latex particulates having a diameter of about 100 nm to about 250 nm and can contain about 3 wt % to about 5 wt % of encapsulated pigment.

Abstract: A composition in the form of a positive latex includes: a) 50-80 wt. % of at least one cross-linked, branched, or linear organic polymer (P), b) 5-10 wt. % of a water-in-oil (W/O) emulsifying system (S1), c) 5-45 wt. % of at least one oil, and d) 0-5 wt. % of water. Between 0.01 mol. % and 10 mol. % of the monomeric patterns of the monomer P include at least one neutral monomer of formula (I): C(R1)(R3)?C(R2)—C(?O)—O—(CH2—CH2—O)n—R4 (I) wherein the radicals R1, R2 and R3, which are the same or different, independently represent a hydrogen atom or a linear or branched alkyl radical including between 1 and 4 carbon atoms, the radical R4 represents a linear or branched, saturated or unsaturated, aliphatic radical including between 6 and 30 carbon atoms, and n represents a number between 1 and 50. A production method and use are also described.

Abstract: An injection molding composition, having a small fluctuation characteristic and a better characteristic, is provided. The above composition is the injection molding composition comprising a ferrite powder which is a collection of ferrite particles, a first binder and a second binder. A weight and a specific surface area of the ferrite powders are represented by Wp and S, and a weight and a density of the first binder and the second binder is represented by Wb1, Wb2, and Db1, Db2. A hypothetical thickness Tb1 of the first binder is 2.0 to 15.0, and a hypothetical thickness Tb2 of the second binder is 16.5 to 32.0. In the composition, it is preferable that coated ferrite particles coating the outer circumference of the ferrite particles with the first binder and the second binder exist.

Abstract: A vinylidene chloride-based resin composition enables continuous extrusion molding over a long period of time and has excellent thermal stability. A vinylidene chloride-based resin composition includes particles (A) which are solid at room temperature; a plasticizer (B) which is liquid at room temperature; and a vinylidene chloride-based copolymer, wherein, in an area of 0.4 cm2 observed with a transmission optical microscope, a ratio of the particles (A) which have a projected area of 1000 ?m2 or more and 3000 ?m2 or less to the particles (A) which have a projected area of 10 ?m2 or more and 3000 ?m2 or less is 20% or less; and a ratio of the particles (A) which have a projected area of 10 ?m2 or more and less than 100 ?m2 to the particles (A) which have a projected area of 10 ?m2 or more and 3000 ?m2 or less is 40% or more.

Abstract: Proposed is a method for the production of at least one composite layer (7) in which nanoparticles are embedded in a polymer matrix, comprising the following steps: 1. in situ production and aerosol deposition of nano-particles onto a substrate (1) for the formation of a particle film (2) on the substrate (1); 2 immersing said particle film (2) with a polymer solution or a liquid polymer precursor material for the formation of the composite layer (7).

Abstract: The invention relates to colorant compositions, and aqueous latex paints or other water-borne coatings made from them, which have a mitigated environmental impact. Levels of solvents, additives and impurities comprising volatile non-aqueous constituents, alkylphenol ethoxylates (and derivatives thereof), crystalline silica, and/or formaldehyde are decreased relative to those typical of preceding generations of colorants and tinted aqueous latex paints and other water-borne coatings. On the other hand, paint-performance as indicated by any of Stormer viscosity stabilization, rheological profile flow/leveling and sag resistance, water sensitivity and color transfer resistance is comparable to a paint in which the aforementioned solvents, additives and impurities are still present.

Abstract: The present invention relates to a grafted pigment dispersing polymeric additive for opacifying pigments, prepared by polymerizing monomers in the presence of a polymeric pigment dispersant. The polymeric pigment dispersant has low molecular weight, high acid number and is dissolvable in alkali solution. When incorporated into paint compositions, hiding is improved with less opacifying pigments.

Abstract: A bioactive and osteoconductive bone cement is produced from polyacrylates or polymethylacrylates by addition of small amounts of polymerizable monomers containing anionic groups which cause the cement surface to mineralize after being incubated in simulated body fluid. The obtained mineralized layers contain calcium phosphate phases such that the formation of fibrous intermediate layers is prevented once the bone cement has been implanted in bones. Optionally, other additives, e.g. biocompatible calcium salts, biocompatible buffering substances, or x-ray contrast agents, antibiotics, antimicrobial agents, and/or anti-inflammatory agents can be added in order to improve the properties of the cement for individual purposes. The bone cement can be used for anchoring prosthesis components in the bone, stiffening bones, filling and reconstructing all types of bone defects, as dowels for bone screws, or as an implant material for anchoring screws and other implants used for osteosynthesis.

Abstract: Disclosed is a UV curable sealing composition for a dye-sensitized solar cell. The UV curable sealing composition includes a polymer bead as a spacer for maintaining an interval between electrodes of the dye-sensitized solar cell.

Abstract: A primer-less coating composition for facestock comprises: a binder being a water-dispersible polymer; an ethylenically unsaturated compound which is aqueous-dispersible and miscible with or bonded to said water-dispersible polymer, wherein said ethylenically unsaturated compound is able to form a covalent bond with an ink; and a crosslinker, wherein said crosslinker is suitable for binding the coating to the facestock. The coating composition may be applied to a substrate to form a printable film. A printed film in accordance with the invention may be used in a label, for example for use on a container such as a bottle.

Abstract: Articles such as optical displays and protective films, comprising a (e.g. light transmissive) substrate having a surface layer comprising the reaction product of a mixture comprising a hydrocarbon-based hardcoat composition and at least one perfluoropolyether urethane additive. The surface layer exhibits low lint attraction in combination with high contact angles. Hardcoat coating compositions comprising a perfluoropolyether urethane additive and a silicone (meth)acrylate additive are also described.

Abstract: Provided is a transparent pressure-sensitive adhesive agent convertible into an adhesive agent that allows adherends to be instantly fixed to each other, allows the adherends to be reattached to each other, is excellent in processability such as being able to be cut into a sheet shape, is not peeled from the adherends even when exposed to a high-temperature atmosphere such as one in a fire, and has such transparency as to hardly impair the designs of the adherends. The transparent pressure-sensitive adhesive agent convertible into an adhesive agent has pressure-sensitive adhesive property before being sintered, and has adhesive property after being sintered.

Abstract: The present invention relates to a fastening means, in particular a nail, a profiled nail, a nail-screw or a screw, the fastening means being coated at least partially with a coating composition containing a polymer bonding agent. Furthermore, the invention relates to a coating composition for finishing a fastening means and moreover to the use of the coating composition according to the invention.

Abstract: A photopolymerizable inkjet ink including: a photopolymerizable monomer having a Stimulation Index (SI value) of less than 3, where the Stimulation Index indicates the extent of sensitization as measured by a skin sensitization test based on Local Lymph Node Assay; and a phenol aromatic compound having two hydroxyl groups in the molecule thereof.

Abstract: Living radical polymerization processes, reaction products of such processes, and compositions containing such reaction products are provided. More particularly, a living radical polymerization of (meth)acrylic acid monomers employing having a defined order of introduction of the reactants and/or a specific set of reaction conditions, is provided.

Abstract: Provided is a method for manufacturing a peelable laminated film including a layer A including cellulose ester and a layer B including a resin capable of a solution film-formation different from the cellulose ester, the layer A and the layer B having an adhesion of 5 N/cm or less, the method including: simultaneously or sequentially casting and laminating a dope A for forming the layer A, which includes cellulose ester and a solvent, and a dope B for forming the layer B, which includes a resin capable of a solution film-formation different from the cellulose ester and a solvent, on a casting support, peeling off a laminate of the dope A and the dope B from the casting support, and drying the laminate.

Abstract: The present invention provides aqueous binder compositions comprising one or more polyol and a multistage copolymer, preferably, an all acrylic and allylic or all acrylic copolymer, having as the outermost stage a polymerized acid functional aqueous solution polymer and as the one or more remaining stage(s) a vinyl emulsion polymer, wherein the emulsion polymer stage(s) in the multistage copolymer comprises 5 wt. % or less of hydrophilic monomer, based on the total weight of monomers used to make the emulsion polymer stage(s). The multistage copolymer enables incorporation of a much higher amount of hydrophilic monomer into a polymeric binder without the attendant handling or viscosity problems. Also provided are methods of using the aqueous binder compositions comprising pultruding two or more non-woven fibers or a fiber roving with the aqueous binder composition, and drying, Articles comprising the bound fiber(s) are provided.

Abstract: There is disclosed a composition for producing an elastomeric film comprising: a synthetic polymer, sulphur, and a metal-oxide cross-linking agent. The concentration of the total solids in the composition is between 5-20% by weight of the composition. Also disclosed is a multiple-coating method of manufacturing an elastomeric film comprising the steps of: (i) providing a composition comprising a synthetic polymer, a cross linking agent, wherein the concentration of the total solids in the composition is between 5-20% by weight of the composition, (ii) contacting the composition with a mold to form a layer of composition on the mold, (iii) contacting the layer of composition on the mold with a further amount of the composition to form a further layer, (iv) drying the composition, and (v) curing the composition.

Abstract: A design, synthesis and use of templated chemical routes are disclosed for the synthesis of interlocked macromolecular structures and orderly entanglements that are dubbed “Knotty Polymers” using combined supramolecularly assembled macroinitiators and living polymerization.

Abstract: A water based polymeric dispersion for PSA adhesive preparation for transdermal system comprising: a) an aqueous dispersion of a polymer of an acrylate and/or a methacrylate ester, b) a plasticizer c) a shrinkage reducing agent able to reduce the shrinkage of the water PSA dispersion when spread onto a surface to width values lower than 20 mm after 3 minutes rest.

Abstract: This invention relates to coating compositions that include water; a latex polymer and a silane coupling agent. The latex polymer preferably comprises acetoacetoxy functionality, or is a multistage latex, or is an acetoacetoxy functional multistage latex. The silane coupling agent is preferably a functionalized silane coupling agent (more preferably an epoxy-functional silane coupling agent). The compositions may be used to coat a variety of substrates, including wood, cement and fiber cement. Articles having the coating applied thereto are also provided.

Abstract: Embodiments of the present invention include a branched aromatic ionomer, and a process of making it, by co-polymerizing a first monomer comprising an aromatic moiety and an unsaturated alkyl moiety and a second monomer represented by the general formula: [R-AZ]y-MX wherein R is a hydrocarbon chain having from 2 to 40 carbons and at least one polymerizable unsaturation; A is an anionic group; M is a cationic group; Z is ?1 or ?2; X is +1, +2, +3, +4, or +5; and y is an integer having a value of from 1 to 4. The branched aromatic ionomer has a melt flow index ranging from 1.0 g/10 min. to 13 g/10 min. Optionally the melt flow index ranges from 1.3 g/10 min. to 1.9 g/10 min.

Abstract: The present invention provides a terminally modified acrylic polymer having excellent thermal decomposition properties at low temperatures, an inorganic fine particle dispersed paste composition obtained by using the terminally modified acrylic polymer and a method of producing of the terminally modified acrylic polymer.

Abstract: A method of curing a coating composition and a method of forming a cured coating on an automobile component are provided. The coating composition comprises a radical polymerizable compound and an organoborane-amine complex having an organoborane initiator, an amine blocking agent, and water. The method of curing the coating composition comprises the steps of combining the organoborane-amine complex, the radical polymerizable compound, and water to form the coating composition. Carbon dioxide is introduced into the coating composition or into a composition including at least one of the organoborane-amine complex, the radical polymerizable compound, and water prior to forming the coating composition. Carbonic acid is formed in situ within the coating composition through reaction of the water and carbon dioxide. The organoborane-amine complex is decomplexed with the carbonic acid thereby separating the organoborane initiator and the amine blocking agent.

Abstract: Plastisol ink compositions are disclosed containing (meth)acrylate polymer, non-phthalate ester plasticizers, and optionally, pigment, filler, thixotropic agent, and other additives. The plasticizers are separated into lower and higher solvating plasticizers, and the composition for handling and storage is separated into two masterbatches with the (meth)acrylate polymer mixed with the lower solvating plasticizer. The plastisol can be used an ink of various colors for use in application to textiles. The plastisol ink compositions avoid polyvinyl chloride polymer resins and phthalate plasticizers conventionally employed in plastisol inks.

Abstract: Disclosed is a packaging material, wherein a barrier layer, an adhesive layer and a sealant layer are laminated in this order, and the adhesive layer includes an acid-modified polyolefin resin that contains a (meth)acrylic acid ester component. The packaging material is preferably produced by forming on the barrier layer the adhesive layer including the acid-modified polyolefin resin that contains a (meth)acrylic acid ester component, and by subsequently laminating a molten sealant resin on the adhesive layer by extrusion lamination.

Abstract: An application to a resin material and a polymerization method of a polymerization agent having a polymerizable surface structure and a mechanism of supplying the polymerization agent, the polymerization agent exhibiting a polymerizing function in contact with the surface of the resin material. The resin material is obtained by living radical polymerization of a radical polymerization initiator exhibiting living property and an unsaturated monomer capable of radical polymerization with the polymerization initiator. The polymerization agent is brought into in contact with the surface of the resin material to induce radical re-polymerization of the polymerization agent. As a result, a damaged portion of the resin material can be repaired or the resin materials can be bonded to each other by way of the polymerization agent, which can suppress formation of the hetero-interface or improve the service life of the resin material.

Abstract: Provided are a pressure-sensitive adhesive (PSA) sheet having excellent foam repulsion resistance and an aqueous PSA composition suitable for preparing this sheet. The composition primarily comprises an acrylic polymer obtained by polymerizing a starting monomer material containing an alkyl(meth)acrylate as a main monomer and both acrylic acid and methacrylic acid. The acrylic polymer preferably has a weight average molecular weight of 65×104 to 100×104. The starting monomer material is preferred to further contain a silanol-forming monomer and polymerized without the silanol-forming monomer to produce a polymer having a gel fraction of 7 to 17 mass %. The post-crosslink PSA preferably has a gel fraction of 20 to 55 mass %.