Patent GB-903681-A (GB)
Title: A process for stabilising foams obtained from natural synthetic rubber dispersions
IPC: C08L75/04
Filed: 1960-07-28
Abstract: Foams obtained from natural or synthetic rubber dispersions are stabilized using a polysulphonium compound containing 2-100 sulphonium groups.  In the examples, foams are prepared (1) by adding 10% hydrogen peroxide, yeast and an aqueous solution of a polysulphonium compound to a latex mixture containing natural latex, zinc oxide, sulphur, zinc diethyl dithiocarbamate, dihydroxydiphenyl and a condensation product of the sodium salt of naphthalene sulphonic acid and formaldehyde and (2) by heating a mixture of natural latex, a diphenylamine derivative (age resister), sodium oleate, an alkyl sulphonate, zinc oxide, colloidal sulphur, zinc diethyl dithiocarbamate, mercaptobenzimidazole, sodium silicofluoride, the sodium salt of methylenebis-naphthalene sulphonic acid, water and a polysulphonium compound.  Suitable polysulphonium compounds are alkylated polyether-polythioethers obtained by reacting a polyether glycol of general formula <FORM:0903681/IV(a)/1> (in which R represents an alkylene, cycloalkylene or arylene radical which can carry hydroxyl groups, R1-4 each represent a hydrogen atom or an alkyl group with up to 4 carbon atoms and m and n are whole numbers) with a thioether glycol of general formula <FORM:0903681/IV(a)/2> (in which R1-4 each represent a hydrogen atom, or an alkyl, cycloalkyl or aryl group and p represents a whole number); the polyether glycols can be replaced in the condensation by di(hydroxyalkyl) sulphides, by hydroxyalkylation products of monohydric and polyhydric alcohols and by these alcohols themselves. Other suitable thioethers are polyethylene sulphide, the copolymers of ethylene sulphide and glycide or the reaction products of dichlorethane or b ,b -dichlorodiethyl ether with sodium sulphide. Exemplified polysulphonium compound preparations are from (1) thiodiglycol and polypropylene glycol alkylated with dimethyl sulphate, (2) thiodiglycol and a copolymer of ethylene oxide and propylene glycol (M.W. 500) made ternary with dimethyl sulphate, (3) b ,b -dimethyl thiodiglycol and hydroxyethylated butanediol made ternary with diethyl sulphate, (4) thiodiglycol and polypropylene glycol (M.W. 350) made ternary with triethyl phosphate, (5) hydroxyethylated dodecyl alcohol (M.W. 274) and thiodiglycol made ternary with dimethyl sulphate, (6) hydroxyethylated resorcinol (M.W. 800) and thiodiglycol made ternary with dimethyl sulphate and (7) a copolymer of ethylene oxide, propylene oxide, ethylene sulphide and hexane-1,6-diol alkylated with dimethyl sulphate. Specifications 737,924 and 896,999 are referred to.ALSO:Foams obtained from natural or synthetic rubber dispersions are stabilized using a polysulphonium compound containing 2-100 sulphonium groups.  Suitable polysulphonium compounds are alkylated polyether-polythioethers obtained by reacting a polyether glycol of general formula:-  HO(CHR1 CHR2O)m-R-O-(CHR3 CHR4O)nH (in which R represents an alkylene, cycloalkylene or arylene radical which can carry hydroxyl groups, R1 - 4 each represent a hydrogen atom or an alkyl group with up to 4 carbon atoms and m and n are whole numbers) with a thioether glycol of general formula:- HO(CHR1 CHR2-S-CHR3 CHR4O)pH (in which R1 - 4 each represent a hydrogen atom, or an alkyl, cycloalkyl or aryl group and p represents a whole number); the polyether glycols can be replaced in the condensation by di (hydroxyalkyl) sulphides, by hydroxyalkylation products of monohydric and polyhydric alcohols and by these alcohols themselves.  Other suitable thioethers are polyethylene sulphide, the copolymers of ethylene sulphide and glycide or the reaction products of dichlorethane or B1 B-dichlorodiethyl ether with sodium sulphide. In the examples, foams are prepared (1) by adding 10% hydrogen peroxide, yeast and an aqueous solution of a polysulphonium compound to a latex mixture containing natural latex, zinc oxide, sulphur, zinc diethyl dithiocarbonate, dihydroxydiphenyl and condensation product of the sodium salt of naphthalene sulphonic acid and formaldehyde and (2) by beating a mixture of natural latex, a diphenylamine derivative (age resister), sodium oleate, an alkyl sulphonate, zinc oxide, colloidal sulphur, zinc diethyl dithiocarbamate, mercapto benzimidazole, sodium silico fluoride, the sodium salt of methylene-bis-naphthalene sulphonic acid, water and a polysulphonium compound.  Specifications 737,924 and 896,999 are referred to.