Making particles with radial variation

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United States of America Patent

PATENT NO 11667739
APP PUB NO 20200277410A1
SERIAL NO

16648055

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Abstract

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Provided is a process of making polymeric beads comprising

    (a) providing a suspension of monomer droplets in an aqueous medium at pH of 7 or less, wherein the monomer droplets comprise one or more monofunctional vinyl monomers, one or more multifunctional vinyl monomers, and one or more initiators,wherein the aqueous medium comprises one or more derivatives of a nitrite salt in an amount, by weight based on the weight of the aqueous medium, of 0.005% to 0.5%, (b) initiating polymerization of the monomer,wherein no pH-raising substance is added after beginning step (b) until 60% or more by weight of all monofunctional monomer has been converted to polymer.

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Patent Owner(s)

Patent OwnerAddress
DDP SPECIALTY ELECTRONIC MATERIALS US 8 LLC974 CENTRE RD WILMINGTON DE 19805

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Finch, John David North Wales, US 14 12
Jones, Thomas Jenkintown, US 65 775
Savo, Andrew M Cherry Hill, US 15 16

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