Patent GB-725296-A (GB)
Title: Improvements in or relating to tertiary amine oxides in foam rubber
IPC: C08L21/00
Filed: 1953-01-27
Abstract: Foam synthetic rubber having a fine continuous structure is produced by incorporating into a synthetic rubber latex, vulcanizing ingredients, a gelling agent and a relatively small amount of a tertiary amine oxide having the formula <FORM:0725296/IV (a)/1> wherein R1, R2 and R3 are saturated aliphatic radicals, substituted aliphatic radicals or one of R1, R2 and R3 is a saturated aliphatic radical and the remaining two are joined together as a chain of alkylene groups which may be interrupted by oxygen, frothing the latex, gelling and then vulcanizing.  The oxides may be cetyl dimethyl amine oxide, dioctadecyl methyl amine oxide, di-n-butyl-(2-hydroxyethyl) amine oxide, methyl piperidine oxide, dodecyl dimethyl amine oxide, hexadecyl dimethyl amine oxide, decyl dimethyl amine oxide, 6-(cyclohexyl)-hexyl diethyl amine oxide, tetradecyl dimethyl amine oxide, octadecyl diethyl amine oxide, octyl dimethyl amine oxide, methyl dodecyl cetyl amine oxide, methyl morpholine oxide, dodecyl piperidine oxide, or methyl n-butyl cetyl amine oxide. The rubber may be a polymer of 1.3-butadiene, piperylene, dimethylbutadiene, isoprene, 2 - chloro - 1.3 - butadiene either alone or copolymerized with acrylonitrile, methacrylonitrile, alphachloroacrylonitrile, vinyl naphthalene, vinyl toluene, divinyl benzene, styrene, alphamethylstyrene, methyl acrylate, methyl methacrylate, or acrylamide.  The gelling agent is preferably a delayed-action gelling agent such as an alkali metal silicofluoride, ammonium nitrate, or ammonium sulphate.  The foamed latex mixes also contain sulphur and an activator such as zinc oxide and an accelerator such as a zinc salt of mercaptobenzthiazole, benzothiazole disulphide, zinc diethyl dithiocarbamate, piperidinium pentamethylene dithiocarbamate, and tetramethylthiuram disulphide.ALSO:Foam rubber having a fine continuous structure is produced by incorporating into a rubber latex, vulcanizing ingredients, a gelling agent and a relatively small amount of tertiary amine oxide having the formula:  <FORM:0725296/V/1> wherein R1 R2 and R3 are saturated aliphatic radicals, substituted aliphatic radicals or one of said R1 R2 and R3 is a saturated aliphatic radical and the remaining two of said R1 R2 and R3 are joined together as a chain of alkylene groups which can be interrupted by oxygen, frothing the latex, gelling and then vulcanizing.  The oxides may be cetyl dimethyl amine oxide, dioctadecyl methyl amine oxide, di-n-butyl- (2- hydroxyethyl) -amine oxide, methyl piperidine oxide, dodecyl dimethyl amine oxide, hexadecyl dimethyl amine oxide, decyl dimethyl amine oxide, 6-(cyclohexyl)-hexyl diethyl amine oxide, tetradecyl dimethyl amine oxide, octadecyl diethyl amine oxide, octyl dimethyl amine oxide, methyl dodecyl cetyl amine oxide, methyl morpholine oxide, dodecyl piperidine oxide, or methyl n-butyl cetyl amine oxide.  The rubber may be a natural rubber or a polymer of 1.3-butadiene, piperylene, dimethyl butadiene, isoprene, or 2-chloro- 1.3 butadiene either alone or copolymerized with acrylonitrile, methacrylonitrile, alphachloroacrylonitrile, vinyl naphthalene, vinyl toluene, divinyl benzene, styrene, alphamethyl-styrene methyl acrylate, methyl methacrylate, or acrylamide.  The gelling agent is preferably a delayed action gelling agent such as an alkali metal silicofluoride, ammonium nitrate, or ammonium sulphate.  The foamed latex mixes also contain sulphur and an activator such as zinc oxide and an accelerator such as zinc salt of mercaptobenzthiazole, benzothiazole disulphide, zinc diethyl dithiocarbamate, piperidinium pentamethylene dithiocarbamate, and tetramethylthiuram disulphide.