Ultraviolet light absorbing polymer compositions comprising copolymers of 2-Hydroxy-5-acrylyloxyphenyl-2H-benzotriazoles with one or more other monomers copolymerizable therewith, particularly acrylic monomers are useful in the manufacture of occular devices, particularly intraoccular lenses and contact lenses. Polymers of the disclosed benzotriazoles may be added to other organic materials to impart ultraviolet absorbing properties thereo.

Ultraviolet absorbing polymers comprising 2-(2'-hydroxy-5'-acryloyloxyalkoxyphenyl)-2H-benzotriazole

The invention relates to a color-photographic recording material comprising, on a support, a blue-sensitive, a green-sensitive and/or a red-sensitive silver-halide emulsion layer, a protection layer above the sensitive layers, and, if desired, separation layers between the sensitive layers, where at least one of said layers includes a UV absorber of the formula ##STR1## The stabilizers of the formula (1) or (1a) have good inherent stability and high light absorption; the photographic recording material described has excellent stability of the magenta, cyan and yellow layers.

Color-photographic recording material

Novel group-transfer polymerization (GTP) of 4-methacryloyloxy-TEMPO for the preparation of poly(4-methacryloyloxy-TEMPO) (PTMA) has been developed. The new PTMA has been tested as an active electrode material in rechargeable organic radical battery (ORB). The advantage of the GTP method is that it affords PTMA containing the theoretical amount of nitroxide groups. Furthermore, cross-linked PTMA was prepared in the presence of small amounts of ethylene glycol dimethacrylate. Cyclic voltammetry of this PTMA showed a single, highly reversible redox couple at a potential of ca. 3.6 V (vs Li/Li+). This potential is similar to the potential of materials (e.g., LiCoO2) used for the positive electrode in lithium-ion batteries. In galvanostatic cycling experiments between 3.0 and 4.0 V in a half-cell setup vs metallic Li as counter and reference electrode a reversible specific charge of ca. 103 Ah kg-1 at current rates up to 1 C was obtained with the cross-linked PTMA. The useable charge capacity is very stable w...

Synthesis of Poly(4-methacryloyloxy-TEMPO) via Group-Transfer Polymerization and Its Evaluation in Organic Radical Battery

Nitroxide radical polymers – a versatile material class for high-tech applications

for Organic Synthesis Valentine G. Nenajdenko,*,†,§ Vasiliy M. Muzalevskiy,† and Aleksey V. Shastin†,‡ †Department of Chemistry, Moscow State University, Leninskie Gory, Moscow 119992, Russia ‡The Institute of Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Chernogolovka, Moscow Region 142432, Russia A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS), 119991, GSP-1, Moscow, V-334, Vavilova St. 28, Russia

Polyfluorinated ethanes as versatile fluorinated C2-building blocks for organic synthesis.

Polymers or oligometic compounds of the general formula ##STR1## in which X, X a and X b are an ester, amide or cyano group, Y, Y a and Y b are --O-- or --NR 10 --, R 1 , R 1a and R 1b are a group which contains a polyalkylpiperidine radical, and R 1a can also be alkyl, and R 3 , R 3a and R 3b are alkylene, alkenylene, arylene-dialkylene, cycloalkylene-dialkylene or monooxa-alkylene or polyoxa-alkylene, can be prepared by the polycondensation of malonic acid esters or amides or cyanoacetic acid esters or amides with difunctional compounds, preferably dihalogen compounds, in the presence of bases. The products obtained have a molecular weight of 800 to 20,000 and are outstanding light stabilizers for organic polymers.

Polymeric malonic acid derivatives

Malonic acid derivatives of the formula ##STR1## wherein Z contain sterically hindered piperidines as stabilizers against light-induced degradation for organic material.

Piperidine containing malonic acid derivatives

A number of tetra- and pentaalkylpiperidine derivatives of acrylic and methacrylic acid was synthesized, polymerized, and copolymerized with several comonomers as potential UV stabilizers. In addition, by oxidation of some of these polymers and of a copolymer with peroxy compounds, polymers were obtained containing pendant nitroxyl groups. The properties of these polymers with free radical groups are discussed in relation to their spectral data.

Polymere 2,2,6,6,‐Tetraalkylpiperidin‐Derivate, 1. Tetra‐ und Pentaalkylpiperidin‐Derivate von Polyacryl‐ und Polymethacrylestern, Polyacryl‐ und Polymethacrylamiden

Mixtures of a polymer which contains polyalkylpiperidines chemically bonded in any form and a metal compound MeLw, in which Me is a divalent or trivalent metal ion or a divalent oxo-metal ion or a divalent dialkyl-tin ion, L is the monovalent anion of a carboxylic acid, of a phosphinic acid or of a phosphonic acid monoester or of an enol and w is 2 or 3, are effective light stabilizers for plastics. The piperidine-containing polymers can be, for example, polyesters, polyamides, polyamines, polyaminotriazines or poly(meth)-acrylates. Examples of metal compounds MeLw are nickel oenanthate or nickel acetylacetonate. Plastics to be stabilized are in particular the polyolefins.

Friedrich Karrer

Papers

Polymeric malonic acid derivatives

Piperidine containing malonic acid derivatives

Polymere 2,2,6,6,‐Tetraalkylpiperidin‐Derivate, 1. Tetra‐ und Pentaalkylpiperidin‐Derivate von Polyacryl‐ und Polymethacrylestern, Polyacryl‐ und Polymethacrylamiden

Novel light stabilizers for plastics

Short synthesis of 4-chloro-4′-(chlorodifluoromethoxy)benzophenone