Patent GB-636019-A (GB)
Title: Improvements in creaming of synthetic rubber latices
IPC: C08C1/08
Filed: 1948-01-30
Abstract: Aqueous emulsion polymerizates of polymerizable materials selected from the group consisting of butadienes-1,3 and mixtures of butadienes-1,3, with other polymerizable compounds capable of forming copolymers with butadienes-1,3 are creamed by adding a hydrophilic colloidal creaming agent to a mixture of a plurality of such emulsion polymerizates having different average particle sizes.  The polymerizable material may be butadiene-1,3, methyl-2-butadiene-1,3, chloro-2-butadiene-1,3, piperylene or 2,3-dimethyl butadiene-1,3; or mixtures of these materials with styrene, vinyl naphthalene, alpha methylene carboxylic acids and their esters, nitriles and amides such as acrylic acid, methyl acrylate, methyl methacrylate, acrylonitrile, methacrylonitrile, and methacrylamide; isobutylene, methyl vinyl ether, methyl vinyl ketone or vinylidene chloride.  The creaming agents may be alginates, locust seed or carob bean gum, pectates, karaya gum or Irish moss.  In examples, butadiene-styrene latices are agglomerated with varying proportions of ammonium bicarbonate, sodium lauryl sulphate, dimethylamine laurate, and potassium soaps of coconut oil acids and the resulting latices mixed and creamed with ammonium alginate.  The synthetic latex may be obtained by copolymerizing butadiene with styrene in the presence of potassium or sodium abietate, potassium or ammonium persulphate and dodecyl mercaptan with the optional addition of the ammonium soaps of coconut oil fatty acids and the condensation product of sodium naphthalene sulphonate with formaldehyde.  Specification 608,598 is referred to.ALSO:Aqueous emulsion polymerizates of polymerizable materials selected from the group consisting of butadienes-1, 3 and mixtures of butadienes-1, 3, with other polymerizable compounds capable of forming copolymers with butadienes-1, 3 are creamed by adding a hydrophilic colloidal creaming agent to a mixture of a plurality of such emulsion polymerizates having different average particle sizes. The polymerizable material may be butadiene-1, 3, methyl-2-butadiene, 1, 3, chloro-2-butadiene-1, 3, piperylene or 2, 3, dimethyl butadiene-1, 3; or mixtures of these materials with styrene, vinyl naphthalene, alpha methylene carboxylic acids and their esters, nitriles and amides such as acrylic acid, methyl acrylate, methyl methacrylate, acrylonitrile, methacrylonitrile, and methacrylamide; isobutylene, methyl vinyl ether, methyl vinyl ketone or vinylidene chloride.  The creaming agents may be alginates, locust seed or carob bean gum, pectates, karaya gum or Irish moss.  In examples, butadiene-styrene latices are agglomerated with varying proportions of ammonium bicarbonate, sodium lauryl sulphate, dimethylamine laurate, and potassium soaps of cocoanut oil acids and the resulting latices mixed and creamed with ammonium alginate.  The synthetic latex may be obtained by copolymerizing butadiene with styrene in the presence of potassium or sodium abietate, potassium or ammonium persulphate and dodecyl mercaptan with the optional addition of the ammonium soaps of cocoanut oil fatty acids and the condensation product of sodium naphthalene sulphonate with formaldehyde. Specification 608,598 is referred to.