GB595721A - Polymerization of methylpentadienes - Google Patents

Abstract

2-Methyl and/or 4-methyl-1 : 3-pentadiene are polymerized without or with other unsaturated compounds by heating above 75 DEG C. in the presence of a diazo-amino aryl compound. Unsaturated compounds specified are other conjugated pentadienes, 1 : 3-butadiene, isoprene, styrene, alpha-methyl styrene, acrylonitrile, methacrylonitrile, vinyl chloride, vinyl acetate, ethyl acrylate, methacrylates, methyl vinyl ketone and isobutylene, and homologues, analogues and substituted derivatives thereof. Diazo compounds specified are diazoaminobenzene, ortho-, meta- and paradiazoamino toluenes, diazoamino xylenes, toluene azo benzylamine, 4 - methyl diazoamino benzene, para toluene azo 5-pseudo cumidine, benzene azo para cuminylamine, benzene azotetrahydro naphthylamine, benzene diazo amino naphthalene and alpha- and betadiazo amino naphthalenes. Solvent, mass or emulsion methods may be used. Soaps, glue, gelatine, methyl cellulose or polyvinyl alcohol may be used in emulsion. Plasticisers, antioxidants, inhibitors, lubricants, dyes, pigments, fillers, perborates, persulphates, peroxides and ozonides, carbon tetrachloride, tetrachlor- and hexachlorethanes, chlorinated aromatic hydrocarbons, amyl alcohol and other alcohols of 5-8 C atoms, aldehydes, mercaptans, amines, phosphates, carbonates and acetates may be present. Air may be excluded. The products may be mixed with dibutyl phthalate, tricresyl phosphate, triacetin, tetrahydro-naphthalene, coal tar and oils therefrom, cumarone resins, soft factice, wool grease, stearic and lauric acids, waxes, ketone-aldehyde resins, phenyl beta-naphthylamine, p-hydroxy diphenyl, hydroquinone, p-aminophenol, p,p1-diamino diphenylmethane, 2,4-n-toluylene diamine, diphenylamine, o-ditolylamine, p-ditolylamine, phenyl alpha-naphthylamine, phenyl beta-naphthyl nitrosamine, sym-di-beta-naphthyl p-phenylene diamine, diphenyl diamino ethane and 2,4-diaminodiphenylamine, and pigments such as carbon black, iron oxide, titanium dioxide, barytes, zinc oxide, hydrated alumina, lithopone and whiting. Vulcanization can be carried out with sulphur, sulphur dioxide, hydrogen sulphide and sulphur thiocyanate, ozone, organic and inorganic peroxides, selenium, halogens and nitrobenzene, tetramethyl thiuram disulphide, zinc dibutyl dithiocarbamate, tetramethyl thiuram monosulphide, hexamethylene tetramine, benzo thiazyl disulphide, dipentamethylene thiuram tetrasulphide, mercapto benzo thiazole, aldehyde ammonia, diphenylguanidine, diphenylthiourea, piperidinium pentamethylene dithiocarbamate, di-o-tolylguanidine, triphenylguanidine and lead dimethyldithiocarbamate. The compositions may be applied to fibrous material to give balloon coverings, table covers, electrical insulation and friction tape, and hose. Other articles specified are paints, self-sealing tanks, gaskets, belts, vibration dampers, soles, aprons, gloves, gas masks, tyre tubes and casings.