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AssigneeBASF SE
InventorsJonathan P. Antonucci, Michael A. Taylor, Koichi Takamura, Robert Racz
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A polystyrene seed latex composition is provided having a total emulsion polymer content of from 0.2 to 2.0 weight percent and a particle diameter less than 150 Å. The seed latex is produced on a continuous basis by feeding to a continuous stirred reactor an emulsion stream and initiator stream. The feed streams are mixed in the stirred reactor at room temperature to produce the seed latex. Preferably, the initiator stream comprises a sodium formaldehyde sulfoxylate reducing agent. The amount of initiator charged into the continuous seed reactor is sufficient to complete both the seed and a subsequent continuous latex polymerization reaction.
A polystyrene seed latex composition having a total emulsion polymer content of from 0.2 to 2.0 weight percent and a particle diameter less than 150 Å.
A polystyrene seed latex composition having a total emulsion polymer content of from 0.2 to 2.0 weight percent, a particle diameter within the range of 70 to 120 Å, and from 1 to 8 percent of an emulsifier.
A process for producing polystyrene seed latex comprising feeding to a continuous stirred reactor an initiator stream comprising a reducing agent-iron-EDTA complex and an emulsion stream comprising emulsified styrene, providing the streams a residence time in the reactor to react and form a polystyrene seed latex composition having a total emulsion polymer content of from 0.2 to 2.0 weight percent and a particle diameter less than 150Å, and removing the polystyrene seed latex composition from the reactor.
A process for producing polystyrene seed latex comprising feeding to a continuous stirred reactor an initiator stream comprising a sodium formaldehyde sulfoxylate reducing agent-iron EDTA complex, also feeding to the reactor an emulsion stream comprising styrene emulsified in water by an emulsifying agent, and providing the streams a residence time in the reactor of 1 to 15 minutes to react and form a polystyrene seed latex composition having a total emulsion polymer content of from 0.2 to 2.0 weight percent and a particle diameter less than 150 Å.
Dependencies are inferred from the claim text.