Rhone-poulenc Industries

Rhone-poulenc Chimie

Rhone-poulenc Specialties Chimiques

Rhone-poulenc Specialites Chimiques

Rhone-progil

Jean-Claude Daniel

Robert Roullet

Jacques Grossoleil

Jean-Luc Schuppiser

Bernard Chauvel

Christian Pusineri

Dominique Charmot

Marc Tricot

Roger Hogenmuller

Marc Tricot, Deceased

Nadine Jorio

Polymer particles which carry, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, and dispersions thereof, which may be prepared by contacting a latex of particles of a polymer having a glass transition temperature Tg greater than about 40.degree. C., with an amphophilic compound having an HLB greater than or equal to 10 and a molecular weight greater than or equal to 400. The contacting is carried out at a temperature within the glass transition zone of the polymer, until enmeshing of the polymer chains and of the hydrophobic blocks of the amphiphilic compound has been achieved. The hydrophilic block of the amphiphilic compound carries at least one ion-forming or reactive group. The particles and their dispersions are useful in biological applications.

Polymer particles which carry, implanted on their surface, amphiphilic

Polymer particles which carry, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, and dispersions thereof, which may be prepared by contacting a latex of particles of a polymer having a glass transition temperature Tg greater than about 40.degree. C., with an amphiphilic compound having an HLB greater than or equal to 10 and a molecular weight greater than or equal to 400. The contacting is carried out at a temperature within the glass transition zone of the polymer, until enmeshing of the polymer chains and of the hydrophobic blocks of the amphiphilic compound has been achieved. The hydrophilic block of the amphiphilic compound carries at least one ion-forming or reactive group. The particles and their dispersions are useful in biological applications.

Polymer particles possessing, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, and dispersions thereof, prepared by diffusing, into a previously prepared aqueous seeding dispersion of polymer particles, an organosoluble polymerization initiator, swelling the particles of the dispersion thus obtained by introducing a monomer composition comprising at least one monomer and at least one amphiphilic compound, and polymerizing the monomer composition.

Process for the preparation of polymer particles possessing, implanted

Dry material which can be hydrated into an aqueous gel comprising (1) a matrix comprising a macromolecular substance A, capable of forming a porous aqueous gel when it is in the presence of water, (2) a water-soluble linear polymer B, (3) a plasticizer for the macromolecular substance A and, (4) dispersed in the matrix, particles of a polymer C obtained from at least one water-immiscible monomer. The material can be obtained by mixing an aqueous solution of A with the polymer B, the plasticizer and a latex of polymer C, followed by cooling, shaping and drying of the aqueous gel obtained. The dry material can be used in biological applications after rehydration.

Dry material which can be hydrated into an aqueous gel, containing

Latices of vinyl acetate polymers comprising particles having an average diameter between 0.05 and 1 .mu.m and being present in the latex at a concentration of between 10 and 70% by weight. The polymers have a glass transition temperature between -20.degree. and 50.degree. C. The latices also contain a protective colloid comprising a water-soluble polymer (a) containing at least one monomer selected from the group consisting of N-methylolacrylamide and N-methylolmethacrylamide and a water-soluble polymer (b) of ethylene glycol, the polymer (b) having a molecular weight between 1,000 and 50,000. The latices are prepared by polymerization in aqueous emulsion, in the presence of both an initiator and the above-reference protective colloid. The latices may be applied as binders in the manufacture of paints, glues, paper, textiles, floor coverings and mortar additives.

Latices of vinyl acetate polymers

Latices of particles of vinyl acetate/olefin copolymers. The particles have an average diameter between 0.05 and 1 .mu.M. The copolymers have a glass transition temperature between -30.degree. and 50.degree. C. The particles are present in the latices in a concentration between 10 and 70% by weight. The latices contain a protective colloid comprising a water-soluble polymer (a) containing at least one monomer selected from the group consisting of N-methylolacrylamide and N-methylolmethacrylamide and a water-soluble polymer (b) of ethylene glycol, wherein polymer (b) has a molecular weight of between 1,000 and 50,000. The latices are prepared by polymerization in aqueous emulsion, in the presence of an initiator and the above-described protective colloid. The latices may be applied as binders in the manufacture of paints, glues, paper, textiles, floor coverings and mortar additives.

Latices of vinyl acetate/olefin copolymers

Process for the preparation of latices of vinyl acetate polymers. Vinyl acetate is polymerized by itself or mixed with at least one copolymerizable monomer, in aqueous emulsion, in the presence of an initiator, an emulsifier and a protective colloid comprising a water-soluble polymer (a) containing at least one monomer of acrylamide, methacrylamide, or substituted or unsubstituted N-alkyl derivatives of acrylamide or methacrylamide and a water-soluble polymer (b) of ethylene glycol, the polymer (b) having a molecular weight between 1,000 and 50,000. The latices may be applied as binders in the manufacture of paints, glues, paper, textiles, floor coverings and mortar additives.

Process for the preparation of lattices of vinyl acetate polymers

Process for the preparation of latices of vinyl acetate/olefin copolymers. Vinyl acetate is copolymerized with at least one olefin and, if desired, at least one other copolymerizable monomer, in aqueous emulsion, in the presence of an initiator, an emulsifier and a protective colloid comprising a water-soluble polymer (a) containing at least one monomer of acrylamide, methacrylamide or substituted or unsubstituted N-alkyl derivatives of acrylamide or methacrylamide and a water-soluble polymer (b) of ethylene glycol having a molecular weight between 1,000 and 50,000. The latices may be applied as binders in the manufacture of paints, glues, paper, textiles, floor coverings and mortar additives.

Process for the preparation of lattices of vinylacetate/olefin copolymers

Aqueous latex base binder of a synthetic polymer for manufacturing tufted floor covering having improved wear-resistance. The content of hydrosoluble compounds dissolved in the aqueous phase in the latex is less than 0.5% by weight in relation to the polymer.

Binder for manufacturing tufted floor coverings

Aqueous latex base binder of a synthetic polymer for manufacturing nonwoven fabrics, and specifically webs for sanitary use having improved breaking strength. The content in the latex of hydrosoluble compounds dissolved in the aqueous phase is less than 0.5% by weight in relation to the polymer.

Binder for manufacturing nonwovens

Magnetic-polymer latex having a concentration of less than 65% by weight of hydrophobic vinyl aromatic polymer particles. The polymer particles have diameters from 0.03 to 5 microns and also have dispersed therein a magnetically-charged material in an amount of from 0.5 to 50% by weight with respect to the polymer portion of the polymer particles. A process for preparing magnetic-polymer latices. Magnetically charged particles are dispersed in an organic phase comprising an organically soluble initiator and an organic monomeric component selected from the group consisting of a single vinyl aromatic monomer and a combination of a single vinyl aromatic monomer and a copolymerizing monomer. The dispersion so obtained is mixed with an aqueous solution containing an emulsifying agent and the mixture is homogenized. Polymerization is then effected to form a magnetic-polymer latex containing hydrophobic vinyl aromatic polymer particle. More organic monomer component may be added immediately prior to or during polymerization. Alternatively, the magnetically-charged material may be dispersed into an organic phase comprising an organically soluble initiator and a water-soluble organic compound. An organic monomeric component is added to the aqueous-organic phase mixture after homogenization and prior to or during polymerization, which is effected to form a magnetic-polymer latex containing hydrophobic polymer particles. The magnetic-polymer latices obtained are useful in paints, magnetic tapes, recordings, and biological applications.

Magnetic polymer latex and preparation process

Process for the preparation of magnetic beads of vinylaromatic polymers, which comprises dispersing a magnetic filler in a solution of a homo- or co-polymer in a vinylaromatic compound alone or in mixture with a co-polymerizable monomer, putting the resulting dispersion into suspension in water and polymerizing the monomer or monomers, and use of said magnetic beads in the paints, inks, reprography and in biology.

Process for the preparation of magnetic beads of vinylaromatic polymers

Method of applying a binder having less than 0.5% water soluble

Aqueous latex base binder of a synthetic polymer for preparing aqueous compositions for coating paper and board for printing, having improved wet and dry tear strength. The content in the latex of hydrosoluble compounds dissolved in the aqueous phase is less than 0.5% by weight in relation to the polymer.

Growing community of inventors

Fontenay-sous-Bois, France

Jean-Claude Daniel