Abstract: The invention relates to aqueous polymer dispersions comprising polymerized units issued from the following monomers with related weight proportions based on 100 parts of weight of a)+b): a) 50 to 90% of a monoethylenically unsaturated non-ionic monomer, b) 10 to 50% of vinyl aromatic monomer or methyl methacrylate, c) 1 to 5% of a hydroxy-containing (meth)acrylate, d) 0.1 to 3% of acid monomer selected from d1) acid monomer selected from monocarboxylic or dicarboxylic acid monomers and d2) acid monomer selected from phosphorous-based or sulfur-based strong acid monomers or/and their salts, or from the mixtures of d1) and d2), e) 0.001 to 0.5% of chain transfer agent, and f) 0 to 1% one of internal crosslinker bearing at least two copolymerisable ethylenic unsaturations, the polymer having a Tg measured by DSC from ?30 to 0° C. and a gel content of 0 to 60%, formed during polymerization.

Abstract: The present invention relates to an aqueous dispersion of polymer particles and its preparation process, to an adhesive composition comprising the aqueous dispersion and to the use of the adhesive composition for adhering a label on a bottle.

Abstract: The invention relates to a pressure sensitive adhesive comprising an aqueous polymer dispersion which comprises at least one polymer with monomeric units from a monomeric composition comprising (by weight): a) 60 to 95% of 2-ethylhexyl acrylate; b) 0.1 to 15% of butyl (meth)acrylate; c) 0.5 to 5% of a vinyl aromatic monomer; d) 0.1 to 4% of at least one ethylenically unsaturated acid; e) 0 to 20% of a vinylic ester of C2-C8 carboxylic acid; f) optionally, a monomer different from a), b), c), d) and e); g) at least 0.005% with respect to the total weight of monomers a)+b)+c)+d)+e)+f) of at least one chain transfer agent; the sum of a)+b)+c)+d)+e)+f) being equal to 100%, wherein said monomeric composition does not comprise any C1-C2 alkyl (meth)acrylate.

Abstract: The invention relates to an aqueous coating composition, comprising: a) an aqueous polymer dispersion with said polymer containing monomeric units of at least one dicarboxylic acid monomer, bearing two carboxylic acid functional groups and said polymer remaining insoluble in water after neutralization and remaining in the form of dispersed polymeric particles having a mean particle size varying from 10 to 1000 nm, b) a crosslinker selected from aminoacids bearing at least two amino functional groups capable of reacting with said carboxylic functional groups. It also relates to its use in the treatment of flexible fibrous substrates, a method for and the coated or treated fibrous substrate.

Abstract: The invention relates to an aqueous polymer dispersion which comprises: a) an aqueous polymer dispersion comprising grafted rubber polymeric particles from rubber polymer being selected from natural or synthetic rubber, b) an aqueous polymer dispersion with polymeric particles of a second polymer comprising monomeric units derived from a monomeric composition b) comprising: b1) a (meth)acrylate of a linear or branched alcohol in C4 to C10 or a mixture of such (meth)acrylates, said (meth)acrylate having Tgb1 lower than ?30° C., b2) optionally, at least one comonomer having Tgb2 higher than ?30° C., with said grafted rubber polymeric particles being grafted in an aqueous dispersion by a part of said monomeric composition b) as defined above. The invention covers also a specific process of preparation of said dispersion, an adhesive composition comprising said dispersion, the use of said dispersion in pressure sensitive adhesives and the resulting adhesive.

Abstract: The invention relates to an aqueous polymer dispersion comprising: a) an aqueous polymer dispersion comprising grafted rubber polymeric particles from rubber polymer being selected from natural or synthetic rubber, b) an aqueous polymer dispersion with polymeric particles of a second polymer comprising monomeric units derived front a monomeric composition b) comprising: b1) a (meth)acrylate of a linear or branched alcohol in C4 to C10 or a mixture of such (meth)acrylates, said (meth)acrylate having Tgb1 lower than ?30° C., b2) optionally, at least one comonomer having Tgb2 higher than ?30° C., with said grafted rubber polymeric particles being grafted in an aqueous dispersion by a part of said monomeric composition b) as defined above. The invention covers a process of preparation of said dispersion, an adhesive composition comprising said dispersion, the use of said dispersion in pressure sensitive adhesives, and the resulting adhesive.

Abstract: The invention relates to aqueous polymer dispersions stable for at least 12 h, when dissolved in high amount of organic solvents and acidified at low pH (pH<2). The polymer comprises units and/or groups issued from: a) at least one (meth)acrylic monomer which is (meth)acrylic ester of a C1-C12 alcohol without any other functional group than (meth)acrylate, b) at least monomer b1) or initiator b2) or both as defined: b1) at least one vinylic, allylic or (meth)acrylic monomer, bearing an anionic group derived from strong acids with pKa<3, b2) at least one initiator, bearing the same anionic group as b1), c) at least one hydroxy-functional vinylic, allylic or (meth)acrylic monomer, and optional monomers, and which polymer bears: the anionic groups as defined in b) in an amount of at least 0.05 meq/g and hydroxy groups as defined in c) in an amount of at least 0.1 meq/g.

Abstract: The invention relates to aqueous polymer dispersions comprising polymerized units issued from the following monomers with related weight proportions based on 100 parts of weight of a)+b): a) 50 to 90% of a monoethylenically unsaturated non-ionic monomer, b) 10 to 50% of vinyl aromatic monomer or methyl methacrylate, c) 1 to 5% of a hydroxy-containing (meth)acrylate, d) 0.1 to 3% of acid monomer selected from d1) acid monomer selected from monocarboxylic or dicarboxylic acid monomers and d2) acid monomer selected from phosphorous-based or sulfur-based strong acid monomers or/and their salts, or from the mixtures of d1) and d2), e) 0.001 to 0.5% of chain transfer agent, and f) 0 to 1% one of internal crosslinker bearing at least two copolymerisable ethylenic unsaturations, the polymer having a Tg measured by DSC from ?30 to 0° C. and a gel content of 0 to 60%, formed during polymerization.

Abstract: The present invention relates to aqueous polymeric dispersions comprising emulsion polymerization polymeric particles having a monomeric composition comprising at least one monomer selected from acrylic, vinylic or allylic monomers and further comprising a mixture of surfactants comprising: a) phosphate surfactant selected from alkoxylated alkyl phosphate ester acids or salts, preferably alkoxylated alkyl phosphate monoester-diacids or salts or from alkoxylated alkyl diphosphate diester-monoacids or salts or a mixture of alkoxylated alkyl phosphate monoester-diacids or salts and alkoxylated alkyl diphosphate diester-monoacids or salts, and at least one of the following surfactants: b) surfactant selected from alkoxylated alcohol sulfate metal M salts, c) surfactant selected from dialkyl C4-C18 diester and/or C4-C18 monoesters of sulfosuccinate metal M salts, and the polymer of said polymeric particles having a glass transition temperature Tg, as determined by DSC at a second passage at a heat rate of 20° C.

Abstract: The invention relates to an aqueous polymer dispersion comprising: a) an aqueous polymer dispersion comprising grafted rubber polymeric particles from rubber polymer being selected from natural or synthetic rubber, b) an aqueous polymer dispersion with polymeric particles of a second polymer comprising monomeric units derived front a monomeric composition b) comprising: b1) a (meth)acrylate of a linear or branched alcohol in C4 to C10 or a mixture of such (meth)acrylates, said (meth)acrylate having Tgb1 lower than ?30° C., b2) optionally, at least one comonomer having Tgb2 higher than ?30° C., with said grafted rubber polymeric particles being grafted in an aqueous dispersion by a part of said monomeric composition b) as defined above. The invention covers a process of preparation of said dispersion, an adhesive composition comprising said dispersion, the use of said dispersion in pressure sensitive adhesives, and the resulting adhesive.

Abstract: The invention relates to an aqueous polymeric dispersion comprising polymeric particles bearing silane and carboxylic groups, the said carboxylic groups being possible to be either in the form of acid or of its salt with monovalent cation, the said polymer particles being crosslinked by the presence of at least one multivalent metal compound selected from: oxides, hydroxides or its salts or complexes, with the Tg of the said polymer being not higher than 0° C. The invention also relates to a preparation process, to a composition for leather treatment comprising the said dispersion, to its use in the treatment of leather, in particular for embossed and automotive leather, and to a leather treated with the said composition.

Abstract: The process comprises the following phases: formation of a pre-emulsion of monomers in water; transfer into the polymerisation reactor with stirring, of (1) reaction stock consisting of a water solution of a surfactant, in an amount by weight relative to the weight of final polymer dispersion of 1–15%; (2) a portion of the pre-emulsion prepared in the previous phase, in an amount of 1%–10% by weight of the initial pre-emulsion; phase C.1: initiation of the polymerisation ; phase C.2: polymerisation of the monomer mixture at 30–90° C., by gradually adding into the reactor, separately, the initiator solution and the remaining portion of the pre-emulsion with an added salt, which is soluble in water at 25° C. to at least 1% by weight, in an amount so as to have a salt concentration in the added pre-emulsion of 0.02–0.25% by weight; phase C.3: scrubbing of the residual monomers.

Abstract: The process comprises the following phases: formation of a pre-emulsion of monomers in water transfer into the polymerisation reactor with stirring, of (1) reaction stock consisting of a water solution of a surfactant, in an amount by weight relative to the weight of final polymer dispersion of 1-15%; (2) a portion of the pre-emulsion prepared in the previous phase, in an amount of 1%-10% by weight of the initial pre-emulsion; phase C.1: initiation of the polymerisation ; phase C.2: polymerisation of the monomer mixture at 30-90° C., by gradually adding into the reactor, separately, the initiator solution and the remaining portion of the pre-emulsion with an added salt, which is soluble in water at 25° C. to at least 1% by weight, in an amount so as to have a salt concentration in the added pre-emulsion of 0.02-0.25% by weight; phase C.3: scrubbing of the residual monomers.

Abstract: A process for obtaining an aqueous polymer dispersion comprising the following steps:—formation of a monomer preemulsion in water by using surfactants;—transfer into the reactor of the basic charge containing a surfactant solution and a part of the preemulsion;—step C.1 polymerization start;—step C.2 polymerization of the monomeric mixture;—step C.3 removal of the residual monomers; wherein: A) from the start and up to a time in the range from −40% to +20% with respect to the instant wherein the polydispersity index of the particle sizes increases, the preemulsion is fed and the surfactant concentration in the reactor is not higher than 0.7% by weight; B) subsequently and till the polymerisation end, the remaining part of preemulsion is fed and the surfactant concentration in the dispersion is higher than that in step A) but lower than 5% by weight with respect to the dispersion weight.

Abstract: Aqueous dispersions of acrylic polymers which do not release formaldehyde, comprising the following components: a) from 25% to 95% by weight of one or more polymerizable acrylic monomers whose corresponding homopolymer has a Tg of less than 0 ° C.; b) from 4% to 70% by weight of one or more polymerizable acrylic monomers whose corresponding homopolymer has a Tg of greater than 0 ° C.; c) from 0.05% to 4% by weight of one or more monomers containing at least two ethylenic unsaturations; d) from 0.2% to 5% by weight of a vinylsilane having the formula: CH2═CR—Si(OR′)nRme) from 0.2% to 10% by weight of an ethylenically unsaturated monomer containing one or more acid groups; the sum of the components a) +b) +c) +d) +e) being 100%.

Abstract: Aqueous polymer dispersions based on acrylic polymers in which the diameter of the individual particles is between 50 nm and 1 000 nm, and the particle distribution by weight relative to the total dry weight is as follows: a) from 50 nm to 180 nm: from 10% to 70%, preferably from 20% to 60%; b) from >180 nm to 1 000 nm: from 30% to 90%, preferably from 40% to 80%; the said dispersions having a minimum film-forming temperature of between about 1° C. and 80° C., which, after drying, produce films which, when subjected to heating under a nitrogen atmosphere, show a weight loss, for films about 1 mm in thickness, and for the following heating cycle, which simulates the process for preparing CRTs, from 25° C. to 375° C. from 40% to 70% by weight, from 375° C. to 440° C. for greater than 99% by weight, after the isothermal stage at 440° C., the remaining residual ash being less than about 0.1% by weight.

Abstract: Aqueous polymeric dispersions comprising the following constituents: (a) from 40 to 95% by weight of one or more monomers containing an ethylenic unsaturated, the corresponding homopolymer of which has a glass transition temperature (Tg) of less than 0 ° C., (b) from 4 to 58% by weight of one or more monomers comprising an ethylenic unsaturation, the corresponding homopolymer of which has a glass transition temperature (Tg) of higher than 0° C. (c) from 0.05 to 4% by weight of one or more monomers containing at least two ethylenic unsaturations (d) from 0.2 to 5% by weight of one or more monomers containing an unsaturation of ethylenic type and at least one functional group capable of interacting at low temperature, lower than 100° C., in the crosslinking process during the coalescence phase.

Abstract: Process for reducing the content of residual monomers, expressed as total VOC lower than 600 ppm and deriving from the monomers utilized to obtain the emulsion lower than 100 ppm; having an amount of wet coagula lower or equal to 500 ppm after wet filtering on 125 micron filter of the emulsion at the outlet after the various dropping phases, in polymrizations and copolymerizations in dispersion or emulsion in aqueous phase based on acrylic monomers, characterized in that it comprises as redox couple the utilization of a reducing agent selected from ascorbic acid or an aldehyde having a number of carbon atoms equal to or higher than 4 and containing at least a salifiable hydrogen, organic or inorganic, or its salts and the inorganic salifiable hydrogen being added to a carboxylic group; the aldehyde reducing agent or its salts being soluble in water for at least 5% by weight, preferably 10% by weight; and from an oxidizing agent consisting of an organic hydroperoxide in aqueous solution, excluding those solubl

Abstract: Process for reducing the content of residual monomers, expressed as total VOC lower than 600 ppm and deriving from the monomers utilized to obtain the emulsion lower than 100 ppm; having an amount of wet coagula lower or equal to 500 ppm after wet filtering on 125 micron filter of the emulsion at the outlet after the various dropping phases, in polymrizations and copolymerizations in dispersion or emulsion in aqueous phase based on acrylic monomers, characterized in that it comprises as redox couple the utilization of a reducing agent selected from ascorbic acid or an aldehyde having a number of carbon atoms equal to or higher than 4 and containing at least a salifiable hydrogen, organic or inorganic, or its salts and the inorganic salifiable hydrogen being added to a carboxylic group; the aldehyde reducing agent or its salts being soluble in water for at least 5% by weight, preferably 10% by weight; and from an oxidizing agent consisting of an organic hydroperoxide in aqueous solution, excluding those solubl

Abstract: Process for reducing the content of residual monomers, expressed as total VOC lower than 600 ppm and deriving from the monomers utilized to obtain the emulsion lower than 100 ppm; having an amount of wet coagula lower or equal to 500 ppm after wet filtering on 125 micron filter of the emulsion at the outlet after the various dropping phases, in polymerizations and copolymerizations in dispersion or emulsion in aqueous phase based on acrylic monomers, characterized in that it comprises as redox couple the utilization of a reducing agent selected from ascorbic acid or an aldehyde having a number of carbon atoms equal to or higher than 4 and containing at least a salifiable hydrogen, organic or inorganic, or its salts and the inorganic salifiable hydrogen being added to a carboxylic group; the aldehyde reducing agent or its salts being soluble in water for at least 5% by weight, preferably 10% by weight; and from an oxidizing agent consisting of an organic hydroperoxide in aqueous solution, excluding those solub