New conversions of substituted vinylcyclopropanes under the effect of complexes of rhodium and palladium
摘要:
Methods have been developed for the synthesis of the dimethyl ester of 1-carboxysorbic acid, 2-methyl-3-acetyl-5-vinyl- and 2-methyl-3-ethylcarboxy-5-vinyldihydrofurans by isomerization, respectively, of 1,1-dimethylcarboxy-2-vinyl-1, 1,1-diacetyl-2-vinyl-, and 1-acetyl-l-ethylcarboxy-2-vinylcyclo-propanes under the effect of Rh- and Pd-containing catalysts promoted with AcOH or CF3COOH.
Thermoplastic polymer compositions such as aromatic polycarbonates, aromatic copoly(ester carbonate)s , polyarylates, poly(arylene oxide)s, and polyarylether sulfones containing dicyclopentadienyl diradicals and method for manufacture. The modified polymer compositions have improved melt flow properties.
Radiation-sensitive composition containing a vinyl pyrrolidone polymer and use thereof in lithographic printing plates
申请人:EASTMAN KODAK COMPANY
公开号:EP0472228A1
公开(公告)日:1992-02-26
Radiation-sensitive compositions which are especially useful in the production of negative-working lithographic printing plates comprise a photocrosslinkable polymer containing the photosensitive group
as an integral part of the polymer backbone and, in an amount sufficient to improve the properties of the composition, a polymer of vinyl pyrrolidone. The polymer of vinyl pyrrolidone improves the properties of the radiation-sensitive composition in regard to such factors as shelf life, image contrast, and developability and thereby provides a superior lithographic printing plate. In a preferred embodiment of the invention, the radiation-sensitive composition also contains a copolyester of an unsaturated dicarboxylic acid and an oxyalkylene ether of an alkylidene diphenol. The aforesaid copolyester provides the further advantage of greatly enhanced ink receptivity.