Bayer Aktiengesellschaft

Martin Matner

Hermann Perrey

Gustav Sinn

Ernst Schwinum

Ferdinand Heins

Hermann-Josef Bross

Hermann J Bross

Heinrich Alberts

Hans Rudolph

Thomas Scholl

Volker Damrath

Hellmut Striegler

Ludwig Mott

Heinrich Grave

Raoul Resz

Hans-Gunter Vogt

Heinz Hornig

Latices based on conjugated dienes are produced using emulsion polymerization by introducing the monomers to be polymerized into the initially introduced seed latex in the presence of a free-radical forming activator and an emulsifier in such a manner that the ratio of the monomer polymerization rate to the monomer feed rate is less than 0.7:1 and by performing polymerization up to a monomer conversion of .gtoreq.95% at temperatures of 10 to 85.degree. C., wherein the addition of the emulsifier is controlled in such a manner that the final particle size (TG.sub.L) of the latex to be produced is governed by the following equation:

Process for the production of latices based on conjugated dienes by

A binder for textile structures which are graft copolymer latices in which the following are incroporated in the graft copolymer:

Polysiloxane graft copolymer latex for strengthening textile structures

This invention relates to mixtures of at least one elastomer latex with at least one dispersion of an aromatic polycarbonate, aromatic polyester or aromatic polyester carbonate.

Mixtures of elastomer latices and dispersions of aromatic

Certain polyurea-modified polyether urethanes of polyisocyanates, polyethers and polyamines are suitable as heat sensitizing agents for latices.

Heat sensitizing agents, the production and use thereof

Articles having improved resistance to water can be obtained from fibre materials by using carboxylated rubber latices having particle diameters of less than 200 nm which have been produced by one-step polymerization at pH-values below 7 in the presence of mono-nuclear alkylaryl sulfonates and oil-soluble initiators.

Process for the treatment of fibre materials

Synthetic rubber dispersions containing carboxyl groups, free from specks and with little tendency to foaming, with advantages for their technical application contain a copolymer of 0.3 to 1.0 parts by weight of itaconic acid and 99.0 to 99.7 parts by weight of a mixture of 10 to 90 parts by weight of one or more acyclic conjugated dienes having 4 to 9 carbon atoms and 10 to 90 parts by weight of one or more aryl vinyl monomers having 8 to 12 carbon atoms and/or (meth)acrylonitrile, in which the quantity of (meth)acrylonitrile is at most 50 parts by weight and wherein up to 25 parts by weight of the non-dissociating monomers may optionally be replaced by one or more other non-dissociating copolymerizable monomers, which dispersions are stabilized with 0.05 to 0.5% by weight, based on the copolymer, of an anionic emulsifier.

Synthetic rubber dispersions containing carboxyl groups, a process for

Straight chain alkylsulphonic acid ethanol- and isopropanol amides are used as biodegradable non-ionogenic emulsifiers for producing an emulsion.

Process for producing emulsion

Mixtures of ammonia and alkoxylated polysiloxanes may be used as heat sensitizer for rubber latices. The latices thus obtained are stable so that no coagulation occurs even in the event of prolonged storage or under mechanical stressing.

Mixture of ammonia and alkoxylated poly-siloxanes and its use as a heat

A process for the production of an emulsifier-free self-crosslinkable rubber latex (meth)acrylic acid, N-alkoxymethyl (meth)acrylamide and acyclic conjugated dienes arylvinyl monomers and/or (meth)acrylonitrile, wherein an aqueous emulsion is prepared by adding at least part of the (meth)acrylic acid, part of the diene and further monomers to water, the polymerization reaction is initiated by the addition of an aqueous solution of a peroxodisulphate and is carried out in a first stage at a pH-value of from 3.5 to 7 until at least 50% of the monomers have been polymerized, the rest of the monomers and initiator are added in one or more further stages and the polymerization reaction is continued at a pH-value of from 3.5 to 7 until at least 50% of the monomers and, in the last stage, until from 85 to 100% of the monomers have been polymerized.

Process for the production of emulsifier-free, self-crosslinkable rubber

A base material for artificial leather having a water vapor absorption capacity of from 2 to 8% by weight, based on a fibre fleece impregnated with a rubber latex mixture containing a heat sensitizer, a quick-acting vulcanization accelerator and, as expanding agent, a silicone oil emulsion or an inert, emulsifiable substance which is insoluble both in the rubber and the other constituents of the latex. After the impregnation of the fibre fleece, the latex mixture is coagulated by heat, vulcanized and then dried.

Base material for artificial leather

Method for coagulating polymer dispersions with heat sensitizing agents which contain specific urethane groups. These new heat sensitizing agents provide at room temperature stable latices which coagulate completely when heated.

Coagulating a polymer dispersion in the presence of a heat sensitizing

Heat sensitizing mixture comprising an amide and a heat sensitizing

A method for the production of dipped articles of rubber latices, wherein rubber latices are used which have an average rubber-particle diameter of no more than 200 nm and contain a rubber having a Defo value of less than 2000, the rubber latices having been prepared by the polymerization of a monomer mixture of 85 to 50 parts by weight of butadiene and/or isoprene, 10 to 40 parts by weight of acrylonitrile or methacrylonitrile, 0 to 40 parts by weight of styrene, 0 to 10 parts by weight of acrylamide, methacrylamide and/or their methylol derivatives and 0.1 to 10 parts by weight of an .alpha.-.beta.-unsaturated carboxylic acid, in aqueous emulsion in the presence of 0.5 to 6.0% by weight, based on monomer, of an alkylaryl sulphonate and 0 to 5% by weight, based on monomer, of one or more other surface-active substances as emulsifier, at a pH-value below 7, and wherein the pH of the latex is adjusted to a value above 8 with an alkali hydroxide on completion of polymerization and the dipped article of rubber produced by said method.

Dipped articles of rubber

Process for pre-strengthening a non-woven textile fibre fleece obtained by the wet process wherein a heat-sensitive latex mixture whose coagulation point does not substantially change on dilution is applied in a finely divided form to the surface of the wet fleece and the fleece is then heated to a temperature at which the latex mixture coagulates to form a gel-like film.

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Odenthal, Germany

Martin Matner