Bayer Aktiengesellschaft

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Bayer Akteingesellschaft

Friedrich Fahnler

Rolf-Volker Meyer

Rolf Dhein

Dietrich Michael

Rudolf Binsack

Christian Lindner

Ulrich R Grigo

Dieter Neuray

Hans-Detlef Heinz

Peter Tacke

Martin Wandel

Werner Nielinger

Frieder Heydenreich

Helmut Korber

John R Sanderson

Karl-Heinz Ott

Hans Rudolph

Hanns-Peter Muller

Walter Schafer

Leo Morbitzer

Josef Merten

Bert Brassat

Gert Humme

Ludwig Trabert

Harald Selbeck

Kurt Weirauch

Peter-Rolf Muller

Kurt Schneider

Klaus-Dieter Schultz

The invention relates to lactam mixtures which give lactam melts having increased viscosity, to their production and to their use, preferably in the activated anionic polymerization of lactams (to cast polyamides). According to the invention, certain unsaturated aromatic vinyl compound/diene block copolymers (B) which dissolve in the lactam melt are added to the lactam (melt)s (A) in quantities of 1 to 15% by weight, a component (C) which is compatible with the diene block copolymers (B) and which dissolves completely or partly in the lactam melt optionally being added as an additional component. The block copolymers (B) used contain 10 to 85% by weight aromatic vinyl units and 15 to 90% by weight diene units. The block copolymers (B) may even be partly hydrogenated, epoxidized or grafted. The preferred lactam is .epsilon.-caprolactam. Lactam melts of increased viscosity are particularly suitable for taking up reinforcing materials and fillers (D) and for the production of filled cast polyamides. The invention also relates to the use of lactam melts thus thickened, more particularly lactam melts containing fillers/reinforcing materials, in a process for the production of polyamides and also to corresponding polyamide moldings, more particularly by the anionically activated casting process.

Lactam melts having increased viscosity and their use

Polyamide moulding materials which have been impact-modified with diene and/or acrylic rubbers and can be processed by thermoplastic means and contain special diphenols.

Free flowing moulding materials based on polyamides containing bisphenols

This invention relates to the process of applying heat curable reaction resin mixtures of polyisocyanates (a), polyepoxides (b), reaction inhibitors (c), heat activated reaction catalysts (d) and optionally auxiliary agents and additives (e) for the production of multilayered moulded products based on polyamides with a cured duromer layer by applying the mixture and heat curing of the reaction resin mixtures are preferably applied to the polyamide moulded products produced by the anionic lactam polymerization process by rotation, extrusion or centrifugal casting while the said polyamide products are still hot from the heat of polymerization, e.g. to form internal coatings on rotation cast polyamide pipes. The invention further relates to duromer coated multilayered moulded products produced by the above process.

Multilayered moulded products based on polyamides

This invention relates to thermoplastically deformable branched aliphatic polyamides prepared by the hydrolytic polycondensation of lactams in the presence of small quantities of .alpha.-amino-.epsilon.-caprolactam (ACL) and approximately equivalent quantities of polycarboxylic acids (preferably dicarboxylic acids) and to a process for their preparation which is distinguished by considerably reduced polycondensation times without giving rise to cross-linked products. The process optionally in addition employs a solid phase after-condensation in which rapid further condensation takes place to the products with increased melt viscosity which are branched but are still soluble in m-cresol.

Alpha-amino-epsilon-caprolactam-modified polyamide preparation

Thermoplastic, easily flowing hydrophobic polyamides obtained by incorporation of from 2 to 15% by weight, based on polyamide, of at least one monoepoxide compound corresponding to the following general formula ##STR1## in which R is a hydrocarbon radical containing at least 4 carbon atoms.

Hydrophobicized, easily-flowing thermoplastic polyamide containing

Biuret-group-containing polyisocyanates based on non-aromatic diisocyanates, possibly mixed with liquid N-alkyl-lactams, as activators for activated anionic polymerization of lactams.

Activated anionic polymerization of lactams

Improved activators for anionic polymerization of lactams are biuret-containing polyisocyanates based on non-aromatic diisocyanates.

Thermoplastic polyamides containing phenolic compounds in quantities of from 0.5 to 15%, by weight, based on polyamide are less sensitive to water.

Polyamides containing phenolic compounds

Polyamide block copolymers obtained by activated anionic polymerization of lactams having at least 5 ring members in the presence of basic catalysts, polyisocyanates as activators and amino-terminated polyethers, which are characterized in that the amino-terminated polyethers have a functionality of at least 3.0 preferably at least 3.2, and a molecular weight of at least 3500, and the polyisocyanates are aliphatic or cycloaliphatic polyisocyanates.

Branched thermoplastically processible impact-resistant polyamides

This invention relates to thermoplastic molding compositions having improved impact strength at low temperatures comprising polyamides and grafted, at least partially crosslinked diene rubbers and/or acrylate rubbers having a bimodal rubber particle size distribution.

High impact thermoplastic polyamide molding compositions

Impact-resistant polyamide moulding compositions consisting of from 35 to 99% by weight of polyamides and from 1 to 65% by weight of partly cross-linked polymer mixtures, comprising from 5 to 80% by weight of copolymers of ethylene/(meth)acrylic acid (esters) or corresponding graft polymers and from 95 to 20% by weight of polybutadiene rubbers, and optionally conventional additives.

Impact resistant polyamide moulding compositions

Optionally reinforced moulding compositions with high impact strength comprising polyamides and graft products of (co)polymers of butadiene and grafted units of methyl(meth)acrylate.

High-impact polyamide moulding compositions

Polymer blends consisting of from 60-99 % by weight of polyamide and of from 1-40 % by weight of a graft product of polyethylene or copolymers of ethylene with grafted units of (meth)acrylic acid and/or (meth)acrylic acid derivatives and/or maleic acid which graft products have been prepared by a special grafting process.

Polyamide moulding compounds having high impact strength

Moulding compositions comprising polyamides and (meth) acrylate grafted optionally substituted polybutadienes.

Elastomeric thermoplastic moulding compositions

High impact resistant optionally reinforced moulding compositions consisting of polyamide and a graft product of polybutadiene and grafted units of t-butyl acrylate and an acrylic acid ester with 1-4 C-atoms in the alcoholic moiety.

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Krefeld, Germany

Friedrich Fahnler