Patent GB-916352-A (GB)
Title: Barium azodicarboxylate as a blowing agent for plastomers
IPC: C08J9/10
Filed: 1960-06-29
Abstract: Cellular thermoplastic polymers are prepared using barium azodicarboxylate as the blowing agent.  Thermoplastic polymers specified are low and high density polyethylenes, polypropylene, polycaprolactam, neoprene, styrene-butadiene rubber, butyl rubber and polyvinyl chloride.  In the examples, resin and rubber compositions are prepared containing, in addition to the blowing agent, (3) styrene-butadiene rubber, styrene-butadiene resin, coumaroneindene resin, hydrated silica, clay, titanium dioxide, zinc oxide, antioxidant, processing oil, petrolatum, phthalic anhydride, stearic acid, diethylene glycol, dibenzothiazyl disulphide, diorthotolylguanidine, zinc salt of mercaptobenzothiazole and sulphur; (4) neoprene, stearic acid, paraffin wax, antioxidant, magnesium oxide, carbon black, aromatic processing oil, diethylene glycol, zinc oxide and 2-mercaptoimidazoline; (5) butyl rubber, stearic acid, zinc oxide, carbon black, paraffinic oil, petrolatum, paraffinic wax, diethylene glycol, tetramethyl thiuram disulphide, zinc salt of mercapto-beneothiazole and sulphur; (6) polyvinyl chloride, a mixed phthalate ester, a cadmium barium soap, a fluidized epoxy resin, diethylene glycol, stearic acid and polyethylene glycol 400 monolaurate and (7) polyvinyl chloride (which may be mixed with a butadiene-acrylonitrile copolymer), dioctyl phthalate, butyl benzyl phthalate, epoxidized soya bean oil, a barium cadmium fatty acid soap, an alkyl tin mercaptide, stearic acid, calcium stearate and titanium dioxide.ALSO:Barium azodicarboxylate, i.e. the compound of the formula <FORM:0916352/IV (b)/1> is prepared by the reaction between barium hydroxide and azodicarbonamide.  Examples I and II describe the preparation in detail.  The compound is used as a blowing agent for thermoplastic polymers (see Groups IV(a) and V).ALSO:Cellular thermoplastic polymers are prepared using barium azodicarboxylate as the blowing agent.  Thermoplastic polymers specified are low and high density polyethylenes, polypropylene, polycaprolactam, neoprene, styrene-butadiene rubber, butyl rubber and polyvinyl chloride.  In the examples, resin and rubber compositions are prepared containing, in addition to the blowing agent, (3) styrene-butadiene rubber, styrene-butadiene resin, coumaroneindene resin, hydrated silica, clay, titanium dioxide, zinc oxide, antioxidant, processing oil, petrolatum, phtaalic anhydride, stearic acid, diethylene glycol, di benzothiazyl disulphide, diorthyltolyl-guanidine, zinc salt of mercapto benzothiazole and sulphur (4) neoprene, stearic acid, paraffin wax, antioxidant, magnesium oxide, carbon black, aromatic processing oil, diethylene glycol, zinc oxide, 2-mercapto-imidazoline (5) butyl rubber, stearic acid, zinc oxide, carbon black, paraffinic oil, petrolatum, paraffinic wax, diethylene glycol, tetramethyl thiuram disulphide, zinc salt of mercapto benzothiazole and sulphur, (6) polyvinyl chloride, a mixed phthalate ester, a cadmium barium soap, a fluidized epoxy resin, diethylene glycol, stearic acid and polyethylene glycol 400 monolaurate and (7) polyvinyl chloride (which may be mixed with a butadiene-acrylonitrile copolymer), dioctyl phthalate, butyl benzyl phthalate, epoxidised soya bean oil, a barium cadmium fatty acid soap, an alkyl tin mercaptide, stearic acid, calcium stearate and titanium dioxide.