American Cyanamid Company

Tenneco Chemicals, Inc.

William Frederick Cordes, Iii

Robert E Diehl

Donald Goodman

Robert S Miller

The polymerization of a monomer component that comprises vinyl chloride in an aqueous medium in the presence of a free radical generating polymerization initiator is terminated by introducing into the polymerization reaction mixture when from 70% to 95% of the monomer component has been polymerized from 0.01% to 0.10% by weight, based on the weight of the monomer component, of a chain-terminating agent that is a dialkylhydroxyphenylalkanoic acid ester of a neopentyl polyhydric alcohol, such as pentaerythritol tetrakis-[3-(3,5-di-tert.butyl-4-hydroxyphenyl)propionate].

Production of vinyl halide polymers with dialkyl, hydroxy phenyl

Thermal stability of halogen-containing polymers is improved by incorporation therein of (a) a compound of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are independently selected from hydrogen, alkyl, aryl, alkyl- or alkoxy-substituted aryl, aralkyl, alkyl- or alkoxy-substituted aralkyl, or taken together form an alkylene radical of 3 to 9 carbon atoms; R.sub.3 and R.sub.4 are independently selected from alkyl of at least 4 carbon atoms, carbalkoxyalkyl, aryl, alkyl- or alkoxy-substituted aryl, aralkyl, alkyl- or alkoxy-substituted aralkyl or taken together form thiodimethylene, an ortho-arylene radical, an alkyl- or alkoxy-substituted ortho-arylene radical, or an alkylene radical of 2 to 4 carbon atoms; in combination with (b) a divalent metal salt of a carboxylic acid of 7 to 20 carbon atoms, or mixture of such metal salts.

Heat stabilized halogen-containing polymers

Polycarbonate is effectively stabilized against degradation by ultraviolet radiation by .alpha.-cyano-.beta.-(N-cyano-ethyl-p-methoxyanilino)acrylonitrile or .alpha.-cyano-.beta.-(N-methyl-p-ethoxyanilino)acrylonitrile.

Polycarbonate stabilizers

An ultraviolet radiation-curable composition is provided which comprises a polyethylenically unsaturated compound and effective photosensitizing amounts of (a) a phenacyl ester, and (b) a tertiary aliphatic amine.

Phenacyl ester photosensitizers for radiation-curable coatings

2-Alkoxy-1,3-diphenyl-1,3-propanedione compounds have been found useful as photosensitizers in radiation-curable coating compositions. The novel photosensitizers of this invention have the structural formula ##STR1## in which R is an alkyl radical of from one eight carbon atoms.

Photosensitizers for radiation-curable coatings

Polycarbonate is effectively stabilized against degradation by ultraviolet radiation by ethyl .alpha.-cyano-.beta.-(N-methyl-N-cyclohexylamino)acrylate.

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East Brunswick, NJ, United States of America

William Frederick Cordes, Iii