2006

The synthesis of methacrylates having an acetylene moiety activated by an electron-withdrawing group and a radical polymerization of the methacrylates are described. The methacrylates were prepared from alkynoic acids via ω-hydroxyalkyl alkynoates in two steps. This was done by the radical polymerization of the synthesized methacrylates, polymthacrylates having the acetylene moieties activated by the electron-withdrawing group as the side-chain that were obtained in high yields.

Allyl methacrylate, AMA was polymerized in CCl4 solution by α,α′‐azoisobutyronitrile at 50°C. The thermal degradation mechanism of PAMA was characterized by MS, TGA‐FT‐IR and FT‐IR‐ATR methods. The mass spectrum and TGA thermogram showed two stage degradation. The first stage of degradation was mostly linkage type degradation for the fragmentation of pendant allyl groups at 225–350°C. In the second stage, at 395–515°C, the degradation is random scission and depolymerization types. This was also supported by direct thermal pyrolysis of polymer under vacuum.

This invention is related to the preparation of alkyl or alcoxyalkyl-&agr;-cyanoacrylates in monomeric form by depolymerisation of the corresponding poly(alkyl-&agr;-cyanoacrylates) or poly(alcoxyalkyl-&agr;-cyanoacrylates) (PCA). The PCA's are obtained preferably by base-catalyzed condensation of a cyanoacetate with formaldehyde (or a polymer of the latter).

This invention relates to cyanoacrylate-containing compositions that exhibit at least one of improved shock resistance and bond strength, while demonstrating relative surface insensitivity with respect to establishing and maintaining fixture times that are on the order of comparable cyanoacrylate compositions without the added carboxylic acids, The compositions include, in addition to the cyanoacrylate component, certain carboxylic acids.

The condensation of active methylene compounds 1 with acetaldehyde was efficiently promoted by a catalytic amount of lithium bromide in the presence of acetic anhydride to give ethylidene malonates 2 in 77-97% yield.

Three different types of ion-supported TEMPO catalysts are synthesized and their catalytic activity in the chemoselective oxidation of alcohols is investigated. These new catalysts show high catalytic activity in water and can be reused for the next run by extraction of products. Recycling experiments exhibit that ion-supported TEMPO can be reused up to five times without loss of catalytic activity. This system offers a very clean, convenient, environmentally benign method for the selective oxidation of alcohols.

This review describes the synthesis and reactions of cyanoacetic acid hydrazide as building block for the synthesis of polyfunctionalized heterocyclic compounds with pharmacological interest.

Gap-filling cyanoacrylate adhesives containing cyanoacrylate esters and organic halogenated polymers with a K-value of at least 46.

A cyanoacrylate adhesive composition having a toughening agent comprising poly(vinylidene-co-acrylonitrile) in combination with fumed silica. A useful amount of poly(vinylidene-co-acrylonitrile) is about 1.0% by weight to about 20.0% by weight fumed silica is usefully present in amounts of 1-10% by wt.

An activator composition for the accelerated hardening of cyanoacrylate adhesives, wherein the activator comprises a member selected from the group consisting of: aromatic heterocyclic compounds having at least one N hetero atom in the ring(s) such as pyridines, quinolines and pyrimidines and substituted on the ring(s) with at least one electron-withdrawing group which decreases the base strength of the substituted compound compared to the corresponding unsubstituted compound, mixtures of any of the foregoing with each other, and/or with N,N-dimethyl-p-toluidine, and mixtures of any of the