Ciba Specialty Chemicals Corporation

Ciba-geigy Corporation

Witco Vinyl Additives Gmbh

Ciba Specialty Chemicals Corportation

Kurt Hoffmann

Rudolf Pfaendner

Heinz Herbst

Franciszek Sitek

Alfred Steinmann

Thomas Kainmuller

Samuel Evans

Andreas Kramer

Friedrich Stockinger

Bruno Rotzinger

Dietmar Mäder

Hans-Jurgen Sander

Raymond R Seltzer

Hans-Werner Schmidt

Dirk Simon

Neil Dunski

Rolf Drewes

Matthew E Gande

Roland Andernach

Karin Regel

Franca Masina

Felix Meyer

Hans-J&uuml;rgen Sander

Peter Schwarz

This invention relates to a process for stabilising and at the same time phase compatibilising plastics or plastic compositions by incorporating polymeric compounds obtainable by reacting a compound selected from the group consisting of the sterically hindered phenols, sterically hindered amines, lactones, sulfides, phosphites, benzotriazoles, benzophenones and 2-(2-hydroxyphenyl)-1,3,5-triazines, which compounds contain at least one reactive group, with a compatibilisator.

Functionalized polymers

A composition containing (1) a crystalline polypropylene resin and (2) one or more &#x3b2;-nucleating agents of the formula (I), wherein R, Rand R, independently of one another, are C-Calkyl, C-Calkyl substituted by C-Calkylamino, di(C-Calkyl)amino, C-Calkyloxy or hydroxy; C-Calkenyl, C-Ccycloalkyl, C-CCycloalkyl substituted by 1, 2 or 3 C-Calkyl; cyclohexylmethyl; cyclohexylmethyl substituted by 1, 2 or 3 C-Calkyl; C-Ccycloalkenyl, C-Ccycloalkenyl substituted by 1, 2 or 3 C-Calkyl; phenyl substituted by 1, 2 or 3 radicals selected from the group consisting of C-C-oalkyl, C-Calkyloxy, hydroxy, halogen, trihalogenmethyl, trihalogenmethoxy, benzoyl, phenylamino, acylamino and phenylazo; C-Cphenylalkyl, C-Cphenylalkyl which is substituted on the phenyl by 1, 2 or 3 radicals selected from the group consisting of C-Calkyl, C-Calkoxy and hydroxy; naphthyl, naphthyl substituted by CCalkyl, adamantyl, or a 5 to 6 membered heterocyclic group; characterized in that the polypropylene resin has a content of &#x3b2;-form crystals of at least 10% calculated by means of the following equation &#x3b2;-form crystal content (%)=100&#xd7;P,/(P+P+P+P) where Pto Pare respective peak heights (maxima) of the a-form and Pis a peak height (maximum) of the &#x3b2;-form determined by wide angle X-ray scattering. 

&#x3b2; Crystalline polypropylenes

The invention describes novel mixtures comprising i) a processing stabilizer selected from the group consisting of hydroxylamine stabilizers, nitrone stabilizers, benzofuran-2-one stabilizers and/or a compound of the formula I wherein Ris C-Calkyl, Ris C-Calkyl, and ii) an antistatic agent selected from the group consisting of an ethoxylated amine and/or an ethoxylated amide, as stabilizers for protecting organic materials, in particular synthetic polymers, against oxidative, thermal or lightinduced degradation 

Stabilization of organic materials

Functionalised polymers

By heating at above the melting point and/or glass transition point of the polycondensate and adding an aromatic dicyanate; or adding a mixture comprising an aromatic dicyanate and a polyfunctional compound selected from the class of sterically hindered hydroxyphenyl-alkyl-phosphonic esters and monoesters, diphosphonites and secondary aromatic amines; or adding a mixture comprising (i) an aromatic dicyanate, (ii) at least one polyfunctional compound selected from the class of sterically hindered hydroxyphenyl-alkyl-phosphonic esters and monoesters, diphosphonites and secondary amines, and (iii) a difunctional epoxide, it is possible to bring about an increase in the molecular weight and/or viscosity of virgin polycondensate and polycondensate recyclates.

Process for increasing the molecular weight of polycondensates

The dispersion of additives selected from the group consisting of stabilizers, antistatic agents, nucleating agents, biocides and/or flame retardants in synthetic polymers is improved by the addition of at least one polymeric dispersing or solvating agent having amphiphilic properties. Synthetic polymers stabilized in this manner are distinguished by having excellent stability against oxidative, thermal or light-induced degradation.

Synthetic polymers comprising additive blends with enhanced effect

Recycled mixtures of plastics, predominantly thermoplastics, as predominantly produced in the household, in commerce and also in industry and useful material collections, can be stabilized against thermooxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and an inorganic compound from the series consisting of metal oxides, hydroxides and carbonates.

Process for the stabilization of a stabilizer mixtures for recycled plastic mixtures

This invention relates to a process for stabilizing and at the same time phase compatibilising plastics or plastic compositions by incorporating polymeric compounds obtainable by reacting a compound selected from the group consisting of the sterically hindered phenols, sterically hindered amines, lactones, sulfides, phosphites, benzotriazoles, benzophenones and 2-(2-hydroxyphenyl)-1,3,5-triazines, which compounds contain at least one reactive group, with a compatibilisator.

This invention relates to a process for increasing the molecular weight of polyesters, copolyesters or polyester blends by adding an organic phosphate to the processing apparatus and fusing the mixture to above the melting point, in which process the processing apparatus is a single-screw extruder, twin-screw extruder, planetary-gear extruder, ring extruder or co-kneader having at least one vent zone to which underpressure is applied.

Increasing the molecular weight of polyesters

Single-material recycled thermoplastics from commercial and industrial waste can be stabilized against thermal oxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and an inorganic compound from the series consisting of metal oxides, hydroxides and carbonates.

Process for the stabilization of and stabilizer mixtures for single-material recycled plastics

Decomposing polymers using NOR-HALS compounds

Damaged thermoplastics can be outstandingly stabilized by the use of a mixture comprising a) 0.05 to 20% by weight, based on the plastic to be stabilized, of at least one polyfunctional epoxide, b) 0.01 to 2% by weight, based on the plastic to be stabilized, of at least one sterically hindered phenol.

Stabilization of damaged thermoplastics

The invention relates to a process for increasing the molecular weight of polycondensates and at the same time stabilizing them, essentially without crosslinking, which comprises heating a polyamide, a polyester, a polycarbonate or a copolymer or blend of these polymers with addition of at least one diepoxide comprising terminal epoxide groups and as a further structural element a tetramethylpiperidine radical located centrally between the epoxide groups to a temperature which is above the melting point of the polymer in the case of crystalline polycondensates or above the glass point in the case of amorphous polycondensates. The invention additionally relates to mixtures comprising the corresponding diepoxides, to their use, and to polycondensates prepared from them.

Growing community of inventors

Lautertal, Germany

Kurt Hoffmann