Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Degussa Aktiengesellschaft

Degussa Akteingesellschaft

Gerhard Morlock

Heinz Haschke

Herbert Amann

Rolf Ackermann

Horst Kruger

Gerhard Stehlik

Gerhard Hebbel

Gerd Schreyer

Helmut Knorre

Manfred Diehl

Gerhard Pohl

Wolfgang Leonhardt

Maurizio Ragnetti

Heinz Kolb

Hans-Joachim Holle

Hans-Joachin Holle

F Werner Weigelt

Peter Kuzel

Hellmut Trautwein

Hans-Joachem Holle

Volker Bugdahl

Emil Kerschner

Werner Reidt

Horst Krueger

Helmut Anzt

Werner Aldinger

Hans-Peter Schaufler

Wilfried Felber

Egbert Schola

The detergent builder consists of a water-insoluble silicate capable of binding calcium ions as well as of a mixture of two acrylic acid polymerizates which exhibit different viscosity numbers.

Phosphate-free detergent builders

A radiation-hardenable agent for the scratch-resistant coating of organic glasses consists of a cocondensate of vinyl trimethoxysilane or vinyl triethoxysilane and tetramethoxysilane or tetraethoxysilane, a reactive diluent which comprises at least 2 vinyl, acrylic or methacrylic groups per molecule and, if necessary, of a known photoinitiator. The agent can be prepared by forming the cocondensate in the presence of an amount of water which is at least equivalent to the methoxy or ethoxy groups present or in the presence of a small amount of a carboxylic acid, removing all volatile portions of the reaction mixture and mixing the oily siloxane remaining as residue with the other components.

Radiation-hardenable agent for the scratch-resistant coating of organic

The suspension polymerization of acrylic acid esters, methacrylic acid esters and vinyl aromatics alone or in admixture with subordinate amounts of other monomers is carried out in the presence of an acrylic or methacrylic acid homo or polymerizate or its alkali metal or ammonium salts as dispersing agent with the addition of an acid ester of phosphoric acid with an alkanol having 1 to 8 carbon atoms. The size of polymerizate beads produced is influenced by this procedure.

Process for the production of suspension polymerizates

The formaldehyde emission in the thermoplastic processing of antioxidant containing oxymethylene copolymer molding compositions is reduced considerably if these molding compositions additionally contain on the surface or homogeneously mixed in a specifically defined formaldehyde binding material which contains in the molecule at least two 4,6-diamino-1,3,5-triazin-2-yl groups. In this way there are avoided deposits on the die and odor annoyance.

Oxymethylene copolymerizate molding compositions with reduced

Trioxane homo-or copolymerizate is produced by continuously feeding the liquid starting material to be polymerized into a mixer in which there is present a powdered to granular oxymethylene homopolymer or copolymer which is fluidized to form a fluidized bed, the speed of feeding, catalyst concentration and polymerization temperature are coordinated to each other in suitable manner and after a polymerization reaction of at least 70 percent polymerizate is continuously or cyclically discharged from the mixer serving as reactor.

Process for the continuous polymerization or copolymerization of trioxane

Acrylate and methacrylate resins containing hydroxyl groups and modified by .epsilon.-caprolactone are produced by producing an adduct of a hydroxyalkylacrylate or methacrylate and .epsilon.-caprolactone in a first step and then in a second step radically copolymerizing this product with further acrylic acid or methacrylic acid esters and optionally vinyl aromatics in a suitable varnish solvent. The thus obtained copolymerizate solutions after addition of a polyvalent isocyanate are used to produce coatings on substrates and give a baked on lacquer coating with outstanding adhesion to the base.

Process for the production of a hydroxyl group containing

There is provided a binder for coating compositions based on a mixture of an unsaturated .beta.-hydroxy ester with copolymerizable monomers. The binder consists essentially of, on a total weight basis, (A) 25 to 60 weight percent of an unsaturated .beta.-hydroxy ester which is produced by reacting an epoxy resin based on bisphenol A and epichlorohydrin with a molecular weight between 800 and 3000 and an epoxide equivalent weight between 400 and 2500 with a mixture of

Binder for coating compositions and its use

In a molding composition comprising a polyoxymethylene, a melamine formaldehyde polycondensate and an antioxidation agent, the improvement wherein said melamine formaldehyde polycondensate is a finely divided, cross-linked, substantially water insoluble polycondensate comprising the precipitation product obtained by reacting formaldehyde and melamine in a molar ratio between 1.2:1 and 10.0:1, and wherein said polycondensate is in an amount of about 0.001 to about 30 percent by weight, related to the total weight of said composition.

Polyoxymethylene molding composition containing melamine formaldehyde

Glycidyl methacrylate is produced by transesterifying methyl methacrylate with glycidol in the presence of a polymerization inhibitor and a transesterification catalyst in which the catalyst is a salt of formula MeX where Me is an alkali metal ion and X is a cyanide, cyanate or thiocyanate ion.

Process for the production of glycidyl methacrylate

Oxymethylene copolymers molding compositions with low portions of residual formaldehyde are produced by heating the polymerizate melts treated with chemical stabilizers in an apparatus in which there are continuously presented new polymerizate surfaces under reduced pressure. The heating of the polymerizate melt takes place in a thin layer evaporator for highly viscous media during an average residence time of 30 to 120 seconds at an average rate of shear between 500 and 2000 s.sup.-1 and at a pressure P.sub.abs of at most 150 mbar. The escaping gases and vapors are drawn off countercurrent to the polymerizate melt.

Process for the production of oxymethylene copolymer molding

There are prepared powder enamels or varnishes containing an acrylic resin in combination with an aliphatic dicarboxylic acid. The acrylic resin has glycidyl groups and is prepared by bulk polymerizing a mixture of:

Process for the production of a glycidyl group containing acrylic resin

An accelerator combination is provided for the cross-linking of powder paints containing an acrylic resin containing carboxyl groups and an epoxy resin at elevated temperatures, said accelerator containing, based on the weight of said acrylic resin:

Accelerator combination for the cross-linking of powder paints

In a molding composition comprising a polyoxymethylene, a melamine formaldehyde polycondensate and an antioxidation agent, the improvement wherein said melamine formaldehyde polycondensate is a finely divided, cross-linked, substantially water insoluble polycondensate comprising the precipitation product obtained by reacting formaldehyde and melamine in a molar ratio between 1.2 : 1 and 10.0 : 1; and wherein said polycondensate is in an amount of about 0.001 to about 30 percent by weight, related to the total weight of said composition.

An improved process for the trans-esterification of esters of acrylic or methacrylic acid in the presence of a trans-esterification catalyst and a polymerization inhibitor includes the use of about 0.05 to about 10% by weight of an alkali metal cyanide as the catalyst.

Process for the trans-esterification of acrylic and methacrylic esters

Solid thermoplastic terpolymer of trioxane is prepared by reacting trioxane in the presence of a prepolymer having recurring units consisting essentially of about 87-99 percent by weight of units derived from at least one cyclic formal and about 13-1 percent by weight of units derived from diglycerin diformal.

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Hanau, Germany

Gerhard Morlock