123 results about "Polymer adhesive" patented technology

The invention belongs to the technical field of soil curing materials, and relates to a salinized soil curing agent and a preparation method thereof. The composite material comprises the following components in parts by mass: 20-40 parts of a bio-based polymer cementing material; 10 to 20 parts of modified bentonite; 15 to 30 parts of superfine slag powder; 1 to 5 parts of nano silicon dioxide; 5 to 15 parts of magnesium phosphate cement; 3-8 parts of a plant fiber reinforced material; 0.5 to 2 parts of a dispersant; and 2-6 parts of a composite slow-release salt-resistant additive. The problems that a traditional curing agent is weak in salt corrosion resistance and poor in durability in salinized soil are solved, the mechanical property and long-term stability of cured soil are remarkably improved, and the environment-friendly, efficient and high-adaptability salinized soil reinforcing effect is achieved.

A polymer capsule jacketed projectile includes a preformed core enclosed by a nose capsule and a base capsule. The preformed core has an ogive region tapering into a core nose that is connected to a core base by the bearing surface. The nose capsule engages the base capsule around the bearing surface at a jacket joint to form the polymer capsule jacket. The outer surface of the polymer capsule jacket may be seamless, having no visible edges or protrusions, or a cannelure may be formed in the outer surface at the location of the jacket joint. The nose capsule and the base capsule are dip molded and the preformed core is pressed into engagement with both capsule pieces to form the polymer capsule jacketed projectile.

The invention discloses a preparation method of a polymer adhesive capable of broad-spectrum adhesion based on a hydrogen bond-containing amphiphilic deep eutectic solvent of an acrylic acid derivative, and belongs to the technical field of polymer adhesives. The preparation method of the adhesive comprises the following steps: S1, mixing a hydrogen bond donor and a hydrogen bond acceptor, heating and stirring until the mixture is clarified to obtain a eutectic solvent; s2, adding an acrylate monomer and an acrylamide monomer into the eutectic solvent, and uniformly mixing to obtain a mixture; and S3, sequentially adding a chemical cross-linking agent and a photoinitiator into the mixture, and carrying out photo-initiation to obtain the adhesive. The adhesive prepared by the invention has the characteristics of high adhesive power, debonding as required, excellent waterproofness, efficient VOCs adsorption, adaptability to hydrophilic and hydrophobic materials and the like.

The invention belongs to the technical field of solar photovoltaics, and provides novel efficient light conversion photovoltaic glass and a preparation method thereof.The preparation method comprises the steps that glass colored glaze ink corresponding to the novel efficient light conversion photovoltaic glass is prepared, and glass powder, a light conversion material, pearl powder, light diffusion particles and an organic carrier are mixed; the content of the light conversion material is more than 5% and less than 30%; the particle size of the pearl powder is larger than 5 microns and smaller than 20 microns, and the content is larger than 1% and smaller than 10%; the content of the light diffusion particles is greater than 0.1% and less than 5%; printing the prepared glass colored glaze ink on the surface of the front plate glass layer; carrying out toughening treatment on the front plate glass layer printed with the glass colored glaze printing ink, and sintering the glass colored glaze printing ink to form a glass colored glaze layer; the battery piece is bonded to the front plate glass layer with the glass colored glaze layer through the upper adhesive film layer, the back plate glass layer is bonded to the battery piece through the lower polymer adhesive film layer, and preparation of the novel efficient light conversion photovoltaic glass is completed.

The invention discloses sound insulation mortar, a preparation method, a sound insulation mortar system and a construction technology, and belongs to the field of building materials. The phosphogypsum-based low-carbon thermal insulation and sound insulation mortar is prepared from the following raw materials in parts by weight: 50 to 60 parts of phosphogypsum, 20 to 30 parts of filler, 10 to 15 parts of inorganic admixture, 10 to 15 parts of glass beads, 5 to 10 parts of aerogel, 0.1 to 0.5 part of water-retaining agent, 1 to 4 parts of polymer rubber powder, 0.02 to 0.05 part of retarder and 0.2 to 0.5 part of water reducing agent. The ardealite-based low-carbon thermal insulation and sound insulation mortar is compact in structure and good in crack resistance, and has an excellent sound insulation effect on the premise of ensuring that the mechanical property reaches the standard. The thermal-insulation and sound-insulation material is good in fire resistance and outstanding in aging resistance and durability in the long-term use process, has convenient construction performance and can fully meet the comprehensive use requirements of constructional engineering for thermal-insulation and sound-insulation materials.

Disclosed is a method for manufacturing a separator having a polymer adhesive layer. The method includes preparing an aqueous polymer slurry comprising a particulate binder polymer having a glass transition temperature Tg of 20° C. or more and a particle size D50 of 300 to 800 nm, a wetting agent, and a particulate acrylic binder polymer having a glass transition temperature Tg of −10° C. or less and a particle size D50 of 100 to 200 nm, and coating the aqueous polymer slurry on at least one surface of a polyolefin-containing porous membrane having pores and drying the aqueous polymer slurry.

The embodiment of the invention belongs to the technical field of electrochemical gas sensors, and relates to a preparation method of a counter electrode of an NO sensor, which comprises the following steps: adding a polymer adhesive into an organic solvent to prepare a polymer adhesive mother solution; mixing manganese dioxide powder with the polymer adhesive mother liquor, and stirring to form uniform slurry; coating a substrate with the slurry, and performing drying treatment to form a counter electrode plate; and putting the counter electrode plate into an environment with reducing gas or inert gas to carry out high-temperature reduction treatment so as to improve the oxygen vacancy concentration, thereby obtaining the counter electrode of the NO sensor. The invention further provides an NO sensor and an NO detection method. The counter electrode of the NO sensor and the NO sensor prepared by the embodiment of the invention have the advantages of low cost and high anti-interference capability while keeping high oxygen reduction catalytic activity, and are particularly suitable for high-selectivity and high-sensitivity detection of NO gas in the fields of environmental monitoring, medical diagnosis and the like.

This invention belongs to the field of polymer materials, specifically relating to a low-heat-shrinkage polymeric film for laser drilling and its preparation method. The film comprises modified polyphenylene ether resin, vinyl-containing benzoxazine resin, a specific cationic initiator, a toughening agent, and inorganic modified fillers: gadolinium lanthanum zirconate core-shell nanocrystals and lithium aluminum borosilicate nanowires. The preparation method includes: first, surface-treating the two inorganic fillers with a silane coupling agent and then dispersing them in a solvent to obtain a slurry; then, mixing this slurry with the modified polyphenylene ether resin, vinyl-containing benzoxazine resin, cationic initiator, and toughening agent to form a homogeneous adhesive; finally, coating the adhesive onto a carrier film and drying and curing it at three temperature stages from low to high to obtain the finished film. The film prepared by this method exhibits extremely low heat shrinkage during laser drilling, effectively controlling resin protrusion or indentation defects on the hole wall, and significantly improving the quality and reliability of micropore processing.

The invention discloses oxide solid electrolyte nanoparticles, a preparation method of the oxide solid electrolyte nanoparticles and application of the oxide solid electrolyte nanoparticles in a positive plate for an oxide solid electrolyte-based low-temperature battery. The oxide solid electrolyte nanoparticles are prepared by adding a novel amphiphilic molecule dispersing agent in a sanding process to realize perfect dispersion; the effect of stabilizing the nano particles is achieved; the amphiphilic molecular dispersing agent is alkane amidoxime; the positive plate comprises the following solid components; the solid component comprises a multifunctional polymer adhesive; the multifunctional polymer has at least two or more functional groups of a carboxylic acid group, a sulfonic acid group and an amidoxime amine group. According to the oxide solid electrolyte nanoparticle, the preparation method thereof and the positive plate for the oxide solid electrolyte-based low-temperature battery disclosed by the invention, the problem of agglomeration in the preparation process of the nanocrystallization solid electrolyte nanoparticle can be effectively solved, and a battery product with high stability and high low-temperature performance is obtained.

The present application belongs to the technical field of polymer adhesive material, and particularly relates to a resin composition for bonding polyolefin material and a preparation method thereof. The present application is prepared by formula screening optimization, and the ratio of the storage modulus E'30 at 30 DEG C to the storage modulus E'130 at 130 DEG C is greater than 100. The polyurethane resin is used in combination with butadiene-styrene copolymer with butadiene content greater than 60% and butadiene-styrene-vinylpyridine copolymer, so that the adhesive with good fusion and good adhesion to polyethylene base material is obtained. The allyl silicon modified pyridine monomer, allyl silicon modified carbazole monomer and lauryl acrylate are polymerized, and the prepared acrylate polymer is used in combination with the polyurethane resin. The pyridine group, tertiary butyl group, carbazole group and silicon atom in the acrylate polymer and the dodecyl group in the lauryl acrylate are used to improve the adhesion strength to the polyolefin base material.

The application discloses a medical packaging paper and a preparation method and application thereof, and belongs to the technical field of medical packaging materials. The method comprises the following steps: according to a target impregnation amount, utilizing an impregnation parameter correlation formula representing a quantitative relationship among the impregnation amount, impregnation liquid concentration, impregnation temperature and impregnation time, reversely solving and setting impregnation parameters; immersing selected medical packaging raw paper into prepared water-based polymer latex impregnation liquid, and performing impregnation treatment according to the set impregnation parameters, and then performing drying balance treatment to obtain the medical packaging paper. The method realizes accurate controllability of the impregnation amount and process stability, eliminates interference of environmental and operation errors, and ensures consistency of paper performance between batches. Under the core premise of guaranteeing high air permeability of the medical packaging paper, the mechanical strength and heat sealing performance of the paper are greatly improved, and the comprehensive performance balance of high strength, high air permeability and easy heat sealing is successfully achieved.

The present application relates to a kind of water-based sprayable self-drying type acrylate adhesive and its preparation method, belong to polymer adhesive technical field.First, the core layer emulsion formed by hard monomer and multi-functional crosslinking monomer is prepared;Then drop the shell monomer including soft monomer, hydrophilic functional monomer and the functional monomer containing beta-dicarbonyl structure on it, form core-shell structure emulsion;Finally, by pH adjustment, add rheological modifier, film-forming aid and the coordination crosslinking agent containing polyvalent metal ions are prepared.The present application combines core-shell structure with beta-dicarbonyl / metal ion room temperature coordination crosslinking system, wherein the core layer provides rigid support, shell layer promotes rapid film formation, functional monomer and metal ion form strong coordination bond network after moisture volatilization.At the same time, self-made bifunctional monomer containing phosphate and silane significantly improves the universal adhesion of adhesive to different substrates.The prepared adhesive has excellent spray atomization, self-drying, high bonding strength and stability.

The utility model belongs to the technical field of rubber strips, and particularly relates to a double-rib heat-insulating polymer rubber strip which comprises a rubber strip and a heat-insulating layer, a first rubber rib is fixedly connected in the rubber strip, a second rubber rib is fixedly connected in the first rubber rib, a mounting hole is formed in the second rubber rib, and the mounting hole is communicated with the heat-insulating layer. And a connecting frame is fixedly connected to the surface of the adhesive tape, a protective layer is connected to the interior of the heat insulation layer, and a connecting block is fixedly connected to the surface of the protective layer. The heat insulation layer, the sponge layer, the heat insulation groove and the heat storage groove are matched with one another, the temperature is stored and blocked, the use requirements of different environments can be met, and the application range of the rubber strip is widened; a wear-resisting layer is installed on the periphery of the rubber strip, and the wear-resisting capacity of the rubber strip is improved through the wear-resisting layer; and the second rubber rib is fixedly connected into the first rubber rib, and the stretching resistance of the rubber strip is improved through the two rubber ribs, so that the waste of raw materials is reduced.

Disclosed are adhesive medical films incorporating one or more cationic steroidal antimicrobial (CSA) compounds. The adhesive medical film is in the form of a tape, dressing, or sheet, configured for contact against dermal tissue to provide securement of medical devices, wound care, wound closure, and / or scar prevention. The adhesive medical film includes (i) a polymer adhesive (e.g., pressure-sensitive adhesive) in which one or more CSA compounds are distributed, and (ii) optionally, a backing substrate upon which the polymer adhesive is disposed. Examples of polymer adhesives include polyacrylate and silicone adhesives. The adhesive medical films, when used, reduce microbial colonization and / or growth, both on the films during storage and at a dermal site, as compared to the same adhesive medical film without incorporated CSA compounds.

The invention discloses a surface-treatment-free water-based acrylate adhesive for a PVC (polyvinyl chloride) floor and a preparation method of the surface-treatment-free water-based acrylate adhesive, and belongs to the technical field of polymer adhesives. The adhesive comprises the following raw material components: 0.5-15% of ester-soluble chlorinated polypropylene and 26-32% of chlorine; 0.5-15% of acrylic acid; 1-5% of ethyl acrylate; 65 to 95% of butyl acrylate; 0.5 to 3 percent of nano ZnO emulsion; 0.5 to 2% of an aziridine cross-linking agent; 1-5% of a nonionic surfactant; 0.1-1% of a water-soluble initiator; wherein the ester-soluble chlorinated polypropylene is introduced by being dissolved in a mixed monomer of ethyl acrylate and butyl acrylate in advance. The obtained adhesive is good in stability and high in initial adhesion, surface treatment-free adhesion is realized, and the initial adhesion and cohesion are balanced; meanwhile, the coating has excellent heat resistance and creep resistance, is a full-water-based system, is extremely low in VOC content, is green and environment-friendly, and has important industrial application value.

This invention discloses a devolatilization process for high melt flow index and high transparency lithium-based polymer solutions. The process employs falling film evaporation for initial evaporation, followed by deep devolatilization using a twin-screw extruder, with the volatile solvent being condensed and recovered. The devolatilized polymer melt is then extruded by a screw extruder, pelletized by an underwater pelletizer, and dehydrated by a centrifugal dewatering machine to obtain finished polymer granules. This method can be used for the devolatilization of high melt flow index, high transparency, and low water content lithium-based polymer solutions, and the resulting polymer volatile content is ≤0.5% (mass fraction). The granules or cobblestone-like particles are easy for downstream processing applications. This process is simple, low-cost, can be manufactured using existing mature equipment and processes, and is easy to control and industrialize.

The invention discloses a polymer wet coagulation method which comprises the following steps: coagulating a polymer glue solution in at least two coagulation kettles connected in series to obtain polymer aqueous colloidal particles; wherein the steam stripping gas discharged from the first condensation kettle is cooled and then subjected to oil-water separation, and a wet solvent and layered water are obtained; the stripping gas discharged by the first condensation kettle is entrained with rubber scraps, and the method further comprises the following steps: before the stripping gas discharged by the first condensation kettle is cooled, contacting layered water with the stripping gas to take away the rubber scraps in the stripping gas, and then returning the layered water entrained with the rubber scraps to the first condensation kettle. According to the invention, on the premise of not changing the original process conditions of the steam stripping kettle, a trace amount of fine adhesive tape is returned to the first condensation kettle by using the filtering effect when layered water is in contact with the steam stripping gas, so that the amount of adhesive crumbs entrained in the steam stripping gas of the first condensation kettle is reduced; and meanwhile, layered water circularly flows and is updated constantly, so that the blocking and hanging phenomena are avoided.

The invention relates to the technical field of precision printing, and discloses a composite screen printing plate based on a double-layer polyimide film, which comprises a precision printing layer, a printing layer, a printing layer and a printing layer, the supporting ink penetrating layer is composed of a second polyimide film and is compounded with the precise printing layer through a middle bonding layer; and the composite reinforced substrate layer is polymer screen cloth and is fixedly connected with the back surface of the supporting ink-permeable layer through a hot melt adhesive layer. According to the invention, the expensive stainless steel wire mesh or steel sheet is replaced by the cheap polyester mesh and the high-molecular adhesive; the material cost is reduced, the preparation process is simplified, and the manufacturing cost and the energy consumption are further reduced; the whole screen functional structure is composed of the polyimide film and the polymer glue layer, and the thermal expansion coefficients of all layers of materials are similar, so that the inherent thermal mismatch problem of a traditional metal-PI composite structure is solved; under the environment of temperature change, all the layers cooperatively deform, and pattern micro-deformation and alignment deviation caused by internal stress are effectively eliminated.

This invention discloses a lightweight thermal insulation spray material for fume hood inverted panels and its construction method, relating to the field of thermal insulation materials technology. It is made from the following raw materials in parts by weight: cementitious material: 10-30 parts; aggregate: 10-30 parts; lightweight aggregate: 10-30 parts; polymer powder: 1-5 parts; fiber: 0.1-0.5 parts; water-retaining thickener: 0.1-0.5 parts; redispersible latex powder: 0.5-3 parts; water: 20-35 parts. The spray material of this invention combines lightweight, low thermal conductivity, and high adhesion characteristics. It exhibits excellent high-temperature resistance, freeze-thaw resistance, and thermal shock resistance, with a low rebound rate during construction. The accompanying construction method is simple and efficient, forming a seamless integral thermal insulation layer, effectively solving the problems of hollowing, detachment, and low construction efficiency in traditional thermal insulation processes.

The invention discloses a multifunctional sunroof protective film. The sunroof protective film is composed of a base material layer, an ultraviolet absorption layer, a heat insulation layer and an anti-impact layer, the base material layer serves as a supporting structure and is located on the bottommost layer, the ultraviolet absorption layer and the heat insulation layer are sequentially stacked on the base material layer, and the anti-impact layer is arranged on the outermost layer. All the layers are firmly combined through a macromolecular adhesive to form an integral composite structure. The invention further discloses a preparation method of the multifunctional skylight protective film. The sunroof film solves the problems that an existing sunroof film is weak in ultraviolet-proof capacity and lacks an anti-impact protection function.

The invention provides an inorganic decorative whole-body aggregate material as well as a preparation method and application thereof, and belongs to the technical field of building coatings. The inorganic decorative whole-body aggregate material comprises the following components in parts by mass: 35-50 parts of a composite cementing material; 3-7 parts of a composite alkali activator; 45-60 parts of a functional composite filler; 2-6 parts of a crystallization active agent; 1.5 to 4.0 parts of polymer rubber powder; 0.5 to 1.5 parts of a hydrophobic water reducing agent; 0.1 to 0.5 part of a water-retaining agent; wherein the functional composite filler comprises a pigment and a heat-insulating filler; the crystallization active agent comprises a composite structure which takes metakaolin as a core and takes a crystallization type waterproof agent and a nano nucleating agent as a shell. Through a reasonable raw material formula and a unique preparation process, the impermeability, compressive strength and self-repairing performance of the material can be remarkably improved, and the heat conductivity coefficient of the material is reduced.

The invention discloses a high-temperature oil resistant acrylic adhesive and a preparation method thereof, and belongs to the technical field of polymer adhesives. The preparation method comprises the following steps: adding a hard monomer, a soft monomer, a functional monomer, a photoinitiator and a chain transfer agent into an organic solvent, introducing nitrogen, uniformly stirring, and reacting under UV illumination to obtain a UV copolymer, the conversion rate of the UV copolymer is 5-20%, and the molecular weight range is 6000-30w; the preparation method comprises the following steps: adding the UV copolymer, the soft monomer, the functional monomer and the chain transfer agent into the organic solvent, heating, reacting, preserving heat, adding the thermal initiator, preserving heat, cooling and discharging to obtain the adhesive. According to the invention, the UV polymer and the solution are polymerized and reacted together, so that the compatibility of the glue and a polymer with certain regularity is improved, the conversion rate of the glue is improved, the oil resistance of the glue is improved through UV polymerization and solution thermal polymerization reaction, and the flexibility and temperature resistance of a glue film are improved.

The invention discloses a method for repairing a damaged part of a building external wall thermal insulation layer, belongs to the technical field of building thermal insulation maintenance, and solves the problems of infirm bonding, poor sealing performance and easy cracking in the existing repairing method. According to the key points of the scheme, the method comprises the steps of measuring and recording the thickness of an original thermal insulation layer, vertically cutting to form a repair foundation trench, prefabricating a thermal insulation repair plate with a trapezoidal side groove, coating polymer adhesive mortar, embedding the thermal insulation repair plate into the foundation trench, and pressurizing and curing the thermal insulation repair plate with a mechanical clamp to enable the outer surface of the plate to be flush and the side edge to form a trapezoidal surrounding cavity; and injecting a two-component polyurethane foaming sealant into the bottom of the cavity until the sealant overflows, leveling excess materials, polishing the periphery, then fully coating a first layer of cement-based polymer mortar, pressing in alkali-resistant glass fiber gridding cloth, then covering a second layer of mortar to form a plastering layer, and finally carrying out spray moisturizing maintenance. The method is mainly used for achieving firm sealing and durable repairing of external wall heat preservation damaged parts and ensuring continuity and smooth appearance of a heat preservation system.

The application discloses an ionic polymer adhesive prepared based on PET degradation and a preparation method thereof, and comprises the following steps: an amine group or a hydroxyl group is arranged at one end of a small molecule with an organic cation precursor, and the other end of the small molecule is arranged with the organic cation precursor; an intermediate is obtained by carrying out an aminolysis or an ester exchange reaction on the small molecule and PET; an ionization reaction is carried out on the intermediate and a halogenated hydrocarbon to obtain an organic ionic compound; an anion exchange reaction is carried out by mixing a solution of the organic ionic compound with a salt solution containing a target anion to obtain an organic ionic monomer compound; and the organic ionic monomer compound is heated to carry out a polymerization reaction to obtain the ionic polymer adhesive prepared based on PET degradation. The PET is converted into a small molecule compound through the aminolysis / ester exchange reaction, the organic ionic monomer compound is prepared through the ionization reaction and the anion exchange reaction, the three-dimensional polymer network is formed by dehydration and polymerization and cross-linking, the ionic polymer adhesive has excellent adhesion, and meanwhile, the ionic polymer adhesive can be recycled and repeatedly bonded under specific conditions.

The application discloses a weather-resistant PET carrier tape glass special-purpose acrylic polyurethane dry glue with super-high storage stability, and a preparation and application method thereof, and relates to the technical field of polymer adhesives. The dry glue is prepared from a three-monomer grafted modified acrylic polyurethane prepolymer as a main body, a high hydrogenation degree tackifying resin, a precise semi-prehydrolysis bisilane coupling agent, a special-purpose compounded weather-resistant additive and a 75 DEG C deblocking curing agent through precise proportioning. The application realizes long-term storage stability of the PET carrier tape under constant temperature and humidity for 1-2 years, and the cold bonding glass does not need catalysis or heating, and the service life of the glue film reaches more than 10 years when used outdoors. The raw materials are all industrialized conventional products, the preparation and application process is suitable for the existing glass film micro-concave coating production line, and the application fills the technical gap of the long-term weather-resistant composite demand of the PET carrier tape storage stability and the cold bonding glass.

The present application relates to the technical field of thermal insulation homogeneous bricks, and particularly discloses a cement thermal insulation homogeneous brick, which comprises cement, shale mineral powder, modified vitrified microbeads, lime, polymer glue powder, perlite, reinforced fiber, EPS polystyrene particles, deionized water, calcium carbonate, calcium silicate, magnesium borate, straw powder, AR glass fiber, carboxymethyl cellulose, water reducing agent, foaming agent, foaming regulator, catalyst, crosslinking agent, foam stabilizer and glyoxal, and the components are respectively 300-400 parts of cement, 42-45 parts of shale mineral powder, 33-38 parts of modified vitrified microbeads, 15-25 parts of lime, 2-5 parts of polymer glue powder, 15-18 parts of perlite, 8-12 parts of reinforced fiber, 10-15 parts of EPS polystyrene particles, 200-300 parts of deionized water, 2-3 parts of calcium carbonate and 2-3 parts of calcium silicate in terms of weight ratio. The present application can effectively solve the problems of low structural strength, poor fire resistance and thermal insulation performance and failure to meet the use requirements of the existing cement thermal insulation homogeneous bricks.

The invention discloses a food contact grade water-based VAE adhesive for PE coated kraft paper as well as a preparation method and application of the food contact grade water-based VAE adhesive, and belongs to the technical field of polymer adhesives. The water-based VAE adhesive is prepared from the following components in percentage by mass: 1%-50% of a DiverSol540 VAE emulsion, 30%-90% of a DiverSol613M VAE emulsion, 1%-35% of emulsified water-based rosin and 1%-10% of water. The water-based VAE adhesive disclosed by the invention can form high-strength combination with kraft paper fibers, simultaneously realizes excellent initial wetting and firm adhesion to high-gram-weight PE coated kraft paper, has good cohesion and heat resistance, can effectively prevent thermal creep in a high-temperature coating process or in subsequent use, and solves the problem of high-end food packaging.

A process for making a multistage acrylic composition comprises providing a multistage acrylic polymer latex by emulsion polymerization, wherein the multistage acrylic polymer comprises a first stage acrylic polymer and a final stage acrylic polymer formed on or around the first stage acrylic polymer. At least one of the first stage acrylic polymer and the final stage acrylic polymer comprises structural units of at least one organo-phosphorus monomer. The multistage acrylic polymer is isolated by coagulation and dried to form a powder.