Bayer Aktiengesellschaft

Bayer Akteingesellschaft

Werner Kloker

Helmut-Martin Meier

Rolf Dhein

Jens Winkel

Gerhard Klein

Dieter Freitag

Bernhard Hess

Helmut Schmid

Josef Dullings

Hans-Josef Buysch

Ralf Dujardin

Walter Uerdingen

Hans-Detlef Heinz

Klaus Kraft

Aziz El-Sayed

Armin Sickert

Paul Vente

Hansjochen Schulz-Walz

Leonhard Goerden

Johannes Beckers

Holger Lusgen

Franz Bovender

Franz Gromping

Harald Niesel

Helmut Winchenbach

A polymeric molding compositon based on aliphatic polyamides contains as additives polyarylene sulfides and polyphenolic compounds free from tertiary alkyl group ortho to the phenolic-OH groups is useful in producing molded articles such as films, fibers and shaped objects.

Polyamide molding compounds

To extend the useful life of the elastic seal (6) which is arranged between a base plate (1) and a cover plate (2) of molds for the production of flat moldings of curable casting resins and through the passages (8) of which the mold cavity is charged with the casting resin melt and vented and to accelerate venting and filling, the passages (8) are in the form of fixed capillary tubes (9) which project partly into the seal (6) and which are each adjoined by a channel (10) opening into the mold cavity (3) and closure needles (13) insertable into the channels are provided.

Mold for the production of flat moldings of curable casting resins

Reaction compositions of selected make-up result after curing in non-meltable polymers of high mechanical stability and low water uptake. Owing to the low birefringence of the cured products, these compositions are highly suitable for preparing carrier materials for optically and magnetically readable and/or writable data carriers.

Curable reaction compositions for producing data carriers

A pacified mass is hardened under controlled conditions to produce low tension moulded parts (4) of duroplasts, the shringkage being compensated for by the movement of a lower mould part (2) and/or an upper mould part (3) to follow the mass.

Apparatus for the production of low tension moulded parts

The new 1,7,9,15-tetraoxa-4,12-diaza-8-silaspiro-[7.7]-pentadecanes, which are prepared by reaction of corresponding alkoxysilanes with corresponding alkanolamines, are used above all as hardening accelerators for unsaturated polyester resins and acrylic resins.

1,7,9,15-Tetraoxa-4,12-diaza-8-silaspiro-(7.7)-pentadecanes, a process

This invention relates to a process for the preparation of bisphenol-bisacrylates by the reaction of bisphenols with acrylic acid halides in the presence of bases.

Process for the preparation of bisphenol-bisacrylates

The invention relates to the use of novel N,N-disubstituted arylamines containing polymerizable groups as hardening accelerators for polymerizable compositions based on unsaturated polyester resins, in particular for trowelling and water compositions.

Polymerizable compositions and the use of arylamines as hardening

Compounds of the formula ##STR1## are suitable as curing accelerators which can be incorporated into ethylenically unsaturated, cold-curable resins.

Arylamine derivatives which can be incorporated as copolymerized units

Arylamine derivatives which can be incorporated as co-polymerized units

1,4-Dihydroxynaphthalene, iron compounds and optionally tertiary arylamines prove to be a highly active accelerator/stabilizer system for peroxide-catalyzed ethylenically unsaturated hardenable compounds.

Use of 1,4-dihydroxynaphthalene in the hardening of ethylenically

.alpha.,.beta.-Ethylenically unsaturated polyesters obtained from dicarboxylic acids and monohydric and dihydric alcohols having acid numbers of 1-50 and hydroxyl numbers of 10-80, 1,5-2,5 mols of dicarboxylic acids and 1,5-2,5 mols of monohydric alcohols having been employed, per mol of diols, in their preparation, are an excellent basis for dispersions containing powdery insoluble substances.

Dispersions of powders in unsaturated polyesters

Stable foams of reaction resins and/or condensation resins can be obtained by adding a blowing agent which is gaseous under normal conditions to the resin under pressure, the gas liquid interface being enlarged while dispensing with moving equipment, allowing the mixture to expand and to cure.

Growing community of inventors

Krefeld, Germany

Werner Kloker