Bayer Aktiengesellschaft

Harald Oertel

Ernst Roos

Reinhard Lantzsch

Dieter Arlt

Paul Uhrhan

Norbert Weimann

Hans D Winkelmann

Hans-Josef Buysch

Karlheinz Wolf

Hans Schroer

Christian Lindner

Karl-Heinz Ott

Alfred Pischtschan

Hans J Rosenkranz

Aziz El-Sayed

Friedrich Kowitz

Burkhard Lachmann

Dieter Kuhlmann

Bernhard Arnold

ABS-moulding compositions of (a) 5 to 70% by weight of one or more graft products and (b) 95 to 30% by weight of one or more thermoplastic resins with a content of 0.05 to 2.0% by weight (based on total mixture) of a silico urethane derivative to improve notched impact strength.

ABS-moulding compositions having high notched impact strength

The invention relates to new methylol derivatives of 2,2,6,6-tetraalkylpiperidines, to their production and to their use as chemically attached stabilizers for polymers containing reactive OH- and NH-groups.

Methylol derivatives of 2,2,6,6-tetraalkylpiperidines and their

Isocyanate adduct diols

The invention is related to modified polyurethanes which have a permanent, wash-fast, acidresistant, dry cleaning-resistant and solvent-resistant stabilization based on 2,2,6,6-tetraalkyl-piperidine light protective agents. These stabilizers are an integral constituent of the polyurethanes, that is to say they take part in the polyurethane synthesis by the reaction of an H-active reactive group (for example NH.sub.2, NH-alkyl, CO--NH--NH.sub.2, NH--CO--NH--NH.sub.2, OH or some other H-active group) of the 2,2,6,6-tetraalkyl-piperidine derivatives with isocyanate groups of polyisocyanates or isocyanate prepolymers.

Permanently stabilized polyurethanes

This invention relates to permanently stabilized polymers containing substituted piperidine derivatives chemically attached to the polymer molecule through O- or N-atoms. Compounds based on 2,2,6,6-tetraalkyl piperidines have now been found which, on the one hand, have a very high stabilizing activity and, on the other hand, contain one or more reactive groups through which they are able to react with the polymers to be stabilized. Stabilized polymers, preferably polyurethane elastomer filaments, films and coatings with a permanent washing-resistant, boiling resistant, acid-resistant, dry-cleaning-resistant and solvent-resistant stabilization based on 2,2,6,6-tetraalkyl piperidine light stabilizers are thus obtained.

Permanently stabilized polymers produced by after-treatment with

Process for the production of solutions of segmented self-crosslinkable polyurethanes by incorporating in the polymer chain segments of the general formula

Self-crosslinkable polyurethanes

According to the invention there are obtained modified polyurethanes which have a durable, wash-fast, acid-resistant, cleaning-resistant and solvent-resistant stabilization on the basis of 2,2,6,6-tetraalkyl-piperidine light protective agents. The stabilizers are integral constituents of the polyurethanes, that is to say they are built into the polyurethane chain by a chain lengthening reaction in which two H-active reactive groups (preferably from the series of primary or secondary amino groups, carboxylic acid hydrazide, carbazic ester or semicarbazide groups) of a 2,2,6,6-tetraalkyl piperidine derivative react with isocyanate groups of polyisocyanates or isocyanate prepolymers, optionally in the presence of the usual chain lengthening agents.

Piperidine derivatives of formula ##STR1## can be prepared by reacting 4-amino-piperidine with for example enolic ethers. The compounds obtained may be used as stabilizers.

Piperidine derivatives as light stabilizers

The invention relates to a synthetic polymer composition stabilized against light, heat and atmospheric influences comprising a polymer and from 0.01 to 10% by weight based on the quantity of the synthetic polymer, of a mixture of .alpha.,.alpha.'-bis-(2-hydroxy-3,5-dialkylphenyl)-m-diisopropyl benzene and .alpha.,.alpha.'-bis-(2-hydroxy-3,5-dialkylphenyl)-p-diisopropyl benzene, the mixture containing at least 20% by weight of the m-compound. The stabilized synthetic polymer compositions are used in various forms, e.g. in the form of fibres, filaments, yarns, sheetings, films, foils, latex, foam or coatings.

Synthetic polymer compositions stabilized against discoloration and

Cyanamides which may be obtained by reacting cyanogen chloride with certain piperidines can be used as stabilizers for synthetic polymers against discoloration and degradation under the effects of visible and/or UV-light, heat and/or atmospheric influences.

Cyanamide stabilizers

Thiazolinylamino-piperidine derivatives can be obtained by reacting a .beta.-chloroisothiocyanate with a 4-amino-piperidine. The resulting products can be used as stabilizers for synthetic polymers against discoloration and degradation under the effect of visible and/or UV-light, heat and/or atmospheric influences.

Thiazolinylamino-piperidine derivatives

Stabilizers according to the invention are used for stabilizing synthetic polymers against discoloration and degradation under the effect of visible and/or UV light, heat and/or atmospheric influences.

Stabilization of synthetic polymers

The invention relates to mixtures of .alpha.,.alpha.'-bis-(2-hydroxy-3,5-dialkylphenyl)-m-diisopropylbenzene and .alpha.,.alpha.'-bis-(2-hydroxy-3,5-dialkylphenyl)-p-diisopropylbenzen e which contain at least 20% by weight and preferably from 40 to 70% by weight of the m-compound. Moreover, the invention relates to a process for the production of such mixtures. The mixtures are suitable for stabilizing polyurethanes and other synthetic polymers against discoloration and degradation when exposed to visible and/or UV light and/or atmospheric constituents such as oxygen oxides or nitrogen and waste gases from combustion. Particularly, they are suitable for stabilizing threads and foils of these products including coatings.

Mixtures of .alpha.,.alpha.'-bis-(2-hydroxy-3,5-dialkylphenyl)-p-and

The invention relates to monomethylol ether diols corresponding to the formula ##STR1## in which R represents a straight-chain or branched alkylene radical having up to 12 carbon atoms, and

Growing community of inventors

Odenthal, Germany

Harald Oertel