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A precipitation polymerization process for the production of a macroporous cross-linked copolymer in which there is added to a reactor equipped with a stirrer, at least one monounsaturated monomer and at least one polyunsaturated monomer, dissolving an inorganic polymerization reaction initiator in

A precipitation polymerization process for the production of a macroporous cross-linked copolymer in which there is added to a reactor equipped with a stirrer, at least one monounsaturated monomer and at least one polyunsaturated monomer, dissolving an inorganic polymerization reaction initiator in a homogeneous minimum-boiling binary azeotrope including a solvent and water, and conducting the polymerization in the azeotrope.

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A precipitation polymerization process for producing a macroporous cross-linked polymer powder comprising dissolving an inorganic catalytic initiator in an aqueous medium, forming an azeotrope by contacting the aqueous medium containing the dissolved inorganic catalytic initiator with an organic liq

A precipitation polymerization process for producing a macroporous cross-linked polymer powder comprising dissolving an inorganic catalytic initiator in an aqueous medium, forming an azeotrope by contacting the aqueous medium containing the dissolved inorganic catalytic initiator with an organic liquid, adding the azeotrope to a reactor equipped with a stirrer, adding at least one polyunsaturated monomer to the reactor and dissolving the monomer in the azeotrope, the organic liquid being a solvent for the monomer but not for the polymer, initiating the polymerization, conducting the polymerization in the reactor by stirring the azeotrope and the polyunsaturated monomer at stirring rates in the reactor of from about seventy-five revolutions per minute to below about three hundred revolutions per minute, and precipitating a polymer in the azeotrope in the form of a powder including unit particles, agglomerates, and aggregates.