Abstract:
The present invention relates to a process for precipitation polymerization of Alpha -methylstyrene in a hydrocarbon medium in which poly- Alpha -methylstyrene is insoluble or only little soluble. The polymerization is initiated by a finely divided alkali metal which is used together with certain phosphoric acid amides or ethers or mixtures thereof as polymerization accelerators.
Abstract:
LATICES OF INTERPOLYMERS OF VINYL CHLORIDE, VINYL ESTERS OF BRANCHED ALIPHATIC CARBOXYLIC ACIDS, AND ACRYLIC ACID ESTERS WHICH SHOW UNUSUAL COMPATIBILITY WITH DRY PIGMENTS ARE PREPARED BY POLYMERIZING THE MONOMER MIXTURE IN AN AQUEOUS SOLUTION CONTAINING HYDROXYETHYL CELLULOSE OF 37 TO 50% OXYETHYLENE CONTENT, AN OXYETHYLATED ALKYL PHENOL, AND A SECOND ANIONIC EMULSIFIER SUCH AS AN ALKYLSULFATE OR ALKYLSULFONATE SALT.
Abstract:
Compositions suitable for coating and for the manufacture of films comprise polytrifluorochlorethylene which may be dissolved in a solvent, and a hydroaromatic hydrocarbon of the cyclopentane, cyclohexane, menthane, camphane, pinane, or diterpene series which contains at least one carbon-carbon double bond and at least one alkyl, alkylene or alkylidene radical. Specified hydrocarbons are dipentene, dicyclopentadiene, beta-pinene, camphene, vinyl-cyclohexene, methyl-cyclohexene, phellandrene, terpinolene, and methyl-cyclohexadiene. Solvents mentioned are 1 : 2 : 3-trifluoro - pentachloropropane and o - chlorobenzotrifluoride. Films may be made by spraying solutions on to an aluminium foil and subsequently removing the foil by dissolving it with dilute hydrochloric acid.