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AssigneeBASF SE
InventorsMichael J. Anchor, Sridhar Gopalkrishnan
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An improved emulsion polymerization process utilizing at least one substantially water-insoluble ethylenically unsaturated monomer is provided for forming discrete solid polymeric particles suitable for use in coating and/or adhesive applications. During at least the initial portion of the polymerization a dissolved water-soluble polymerizable surfactant (as defined) formed by the reaction of a diallylamine, ethylene oxide, and propylene oxide and/or butylene oxide additionally is provided in the reaction zone in the continuous aqueous phase. The water-soluble polymerizable surfactant undergoes copolymerization and is substantially completely consumed during the course of the emulsion polymerization. The emulsion polymerization is carried out on a stable basis, there is no need to attempt to remove a surfactant at the conclusion of the emulsion polymerization, and the resulting polymeric particles are particularly well suited for coating and/or adhesive end uses where they form stable films and exhibit improved adhesion characteristics.
In an emulsion polymerization process for forming discrete solid polymeric particles suitable for use in coating and/or adhesive applications wherein at least one substantially water-insoluble ethylenically unsaturated monomer present in a reaction zone undergoes free-radical polymerization at an elevated temperature while suspended in a continuous aqueous phase, the improvement of providing in said reaction zone in said continuous aqueous phase during at least an initial portion of the polymerization a dissolved water-soluble polymerizable ethylenically unsaturated surfactant formed by the reaction of a diallylamine with approximately 50 to 90 weight percent of ethylene oxide and approximately 10 to 50 weight percent of propylene oxide and/or butylene oxide, wherein said water-soluble polymerizable surfactant has a number average molecular weight of approximately 1,000 to 15,000 and is provided in a concentration of approximately 1 to 10 percent by weight based upon the total weight of ethylenically unsaturated monomer present in said reaction zone, and said water-soluble polymerizable ethylenically unsaturated surfactant undergoes copolymerization with other ethylenically unsaturated monomer present in said reaction zone and is substantially completely consumed during the course of said emulsion polymerization.
In an emulsion polymerization process for forming discrete solid polymeric particles suitable for use in coating and/or adhesive applications wherein at least one substantially water-insoluble ethylenically unsaturated monomer present in a reaction zone undergoes free-radical polymerization at an elevated temperature while suspended in a continuous aqueous phase, the improvement of providing in said reaction zone in said continuous aqueous phase during at least an initial portion of the polymerization a dissolved water-soluble polymerizable ethylenically unsaturated surfactant formed by the reaction of a diallylamine with approximately 60 to 80 weight percent of ethylene oxide and approximately 20 to 40 weight percent of propylene oxide and/or butylene oxide, wherein said water-soluble polymerizable surfactant has a number average molecular weight of approximately 2,000 to 9,000 and is provided in a concentration of approximately 2 to 4 percent by weight based upon the total weight of ethylenically unsaturated monomer present in said reaction zone, and said water-soluble polymerizable surfactant undergoes copolymerization with other ethylenically unsaturated monomer present in said reaction zone and is substantially completely consumed during the course of said emulsion polymerization.
Dependencies are inferred from the claim text.