Abstract: A description is given of an extrusion process for the preparation of a low-dust stabiliser, using a subcooled melt as granulation liquid, as well as of novel amorphous modifications of different stabilisers, including 2,2′-methylenebis(4-[1,1,3,3-tetramethylbutyl]-6-benzotriazol-2-yl-phenol), and of the &bgr;-crystalline modification of 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole and of the preparation thereof. The novel process affords products which are easy to handle and which are flowable, and the novel modifications have advantages as regards their preparation, processing and their use as stabiliser.

Abstract: This invention relates to compositions comprising a polyamide, polyester or polyketone, a specific organic phosphite (Irgafos.RTM.12, Ciba-Geigy) and a sterically hindered phenol such as Irganox.RTM.1098, Irganox.RTM.1076, Irganox.RTM.1010, Irganox.RTM.245, Irganox.RTM.259, Irganox.RTM.1035, Irganox.RTM.3114 or Irganox.RTM.3125 (Ciba-Geigy), to the use thereof for stabilising polyamide, polyester or polyketone against oxidative, thermal and/or light-induced degradation, as well as to a process for stabilising these plastic materials.

Abstract: o-Hydroxyphenyl-s-triazines are described which contain at least two alkoxyphenyl substituents. They have the formula (1). The compounds according to the invention are suitable as stabilizers for textile fiber materials, in particular polyester fiber materials, and for organic polymers. Furthermore, they are suitable for use as sunscreens in cosmetic preparations.

Abstract: The invention relates to dimeric 2-(2'-hydroxyphenyl)benzotriazoles of the formula I ##STR1## in which p is 0 or 1; is C.sub.1 -C.sub.12 alkylene;R.sub.1 and R'.sub.1, independently of one another, are hydrogen, halogen, C.sub.1 -C.sub.18 aklyl, C.sub.1 -C.sub.18 alkoxy or --CN;R.sub.2 and R'.sub.2, independently of one another, are hydrogen or C.sub.1 -C.sub.18 alkyl or together are C.sub.2 -C.sub.12 alkylene or C.sub.2 -C.sub.12 hydroxyalkylene; andR.sub.3 and R'.sub.3, independently of one another, are hydrogen, halogen, C.sub.1 -C.sub.18 alkyl or C.sub.1 -C.sub.18 alkoxy.The compounds of formula I are highly suitable for the stabilization of organic material against the harmful effects of heat, oxygen and light, in particular UV radiation.

Abstract: Hydroxyphenyltriazines of formula I ##STR1## wherein R is hydrogen, C.sub.1 -C.sub.18 alkyl, C.sub.2 -C.sub.6 alkyl substituted by halogen or by C.sub.1 -C.sub.12 alkoxy, or is benzyl and R' is hydrogen or methyl, are especially suitable as stabilisers for thermoplastic polymers that comprise hetero atoms in the main chain.

Abstract: Linear alternating polymers of carbon monoxide and at least one ethylenically unsaturated hydrocarbon are stabilized against thermal degradation by the inclusion therein of certain phenolic compounds.

Abstract: Spherically polymerized polyolefins can be advantageously stabilized by being treated with at least one emulsion or dispersion containing a stabilizer or a mixture of stabilizers and an amine of formula I ##STR1## wherein R.sub.1 is C.sub.1 -C.sub.20 alkyl which may be substituted by --OH, or is C.sub.3 -C.sub.50 alkyl which is interrupted by one or more oxygen atoms, or is C.sub.1 -C.sub.8 alkoxy, and each of R.sub.2 and R.sub.3 independently of the other is hydrogen or has one of the meanings indicated for R.sub.1, or R.sub.2 and Rphd 3, together with the nitrogen atom to which they are attached, form a 5- to 7-membered heterocyclic ring.

Abstract: Storable, solid mixture of (a) a long-chain epoxide resin which is free from ester groups and has a high epoxide equivalent weight, (b) an epoxide resin which is free from ester groups, contains cyclic structure and two to three epoxide groups in the molecule and has a low epoxide equivalent weight, (c) a triphenol and (d) a curing accelerator and, if desired, a blowing agent. Laminates, foams, compression moulded articles and adhesive bonds which are stable to hydrolysis, resistant to heat distortion and flexible are obtained on heating.

Abstract: Mixtures of approximately equivalent amounts of (a) a glycidylated hydantoin and (b) a mononuclear phenol with 2 or 3 phenolic hydroxyl groups, at least one of the components (a) or (b) being trifunctional. They additionally contain a curing accelerator and on heating form mechanically good and flexible plastics which are stable to hydrolysis and can be used as building materials and foams, for the finishing and coating of textile material and for the preparation of water-permeable membranes.

Abstract: Aromatic sulfonic acid hydrazides and semicarbazides having a sterically hindered phenol group are usable as blowing agents in the manufacture of foamed plastics articles. On heating to about 200 to 300.degree. C. they are splitting off nitrogen and the residue remaining in the foam acts as stabilizer against thermo-oxidative degradation of the plastic material.

Abstract: Mixtures which can be cured to give moulded materials having technically valuable mechanical and dielectric properties, characterized that they contain(a) polyimides of maleic acid or citraconic acid,(b) derivatives of .beta.-amino-crotonic acid, and optionally(c) polyamines.

Abstract: Mixtures which can be cured to give moulded materials having technically valuable mechanical and dielectric properties, characterized that they contain(a) polyimides of maleic acid or citraconic acid,(b) derivatives of .beta.-amino-crotonic acid, and optionally(c) polyamines.

Abstract: According to the invention, polyaddition products containing imide groups are manufactured by reacting certain polyimides (preferably maleimides) with polycarboxylic acids in the presence of basic compounds. The preferred embodiment (C) relates to the use of catalysts as basic compounds. In particular, tertiary amines, secondary amines or mixed tertiary-secondary amines can be used. A further embodiment (D) relates to the use of primary polyamines as basic compounds. In the latter case, the polyamine participates in the polyaddition mechanism, that is to say the molecules are incorporated into the polyaddition products. In this latter case, catalysts can also be used additionally.The invention can be utilized particularly in the fields of surface protection, the electrical industry, laminating processes, and the manufacture of foamed plastics, and in the building industry.

Abstract: According to the invention, polyaddition products containing imide groups are manufactured by reacting certain polyimides (preferably maleimides) with polyhydric phenols in the presence of basic compounds. The preferred embodiment (A) relates to the use of catalysts as basic compounds. In particular, tertiary, secondary or mixed tertiary-secondary amines can be used. A further embodiment (B) relates to the use of primary polyamines as basic compounds. In the latter case, the polyamine participates in the polyaddition mechanism, that is to say the molecules are incorporated into the polyaddition products. In this latter case, catalysts can also be used additionally.The invention can be utilized particularly in the fields of surface protection, the electrical industry, laminating processes and the manufacture of foamed plastics, and in the building industry.

Abstract: The invention relates to a process for the manufacture of foams by warming the mixture to be foamed in the presence of an organic sulphohydrazide, an organic compound which contains amide groups and a salt of a metal of group IIa or IIb of the Periodic Table. Integral or non-integral foams having a uniform and fine pore structure are obtained.

Abstract: A mixture which can be converted to a heat-resistant foamed plastic and which contains a polyimide of an unsaturated dicarboxylic acid, an azomethine, a solid blowing agent, and optionally a polyamine. On warming, the mixture gives a foamed plastic of high heat resistance and good resistance to chemicals.

Abstract: A mixture which can be converted to a heat-resistant foamed plastic and which contains a solid blowing agent, a thermoplastic prepolymer of a polyimide of an unsaturated acid, an azomethine and a polyamine. On warming, the mixture gives a foamed plastic of high heat resistance and good resistance to chemicals.

Abstract: Epoxide resin foams are manufactured by curing a mixture which contains an epoxide resin, a blowing agent, a surface-active agent and the tetraglycidyl ester of cyclohexanone- or methylcyclohexanone-2,2,6,6-tetrapropionic acid, with a Lewis acid or an addition compound or complex compound of a Lewis acid. The foams obtained show a homogeneous pore structure and no tendency to crack formation, and are heat-stable and largely light-fast. They can be employed in sandwich constructions, as insulating materials against heat and cold, sound and mechanical impact, and in the electrical industry.