Abstract: The present invention provides a process for producing a resin powder containing a radical polymer having a volume-average primary-particle diameter of 1 nm to 300 nm and containing no impurities such as surfactants by a simple procedure without via multistage reactions. The process for producing a resin powder (J) comprising a radical polymer obtained by polymerizing a bifunctional radical-polymerizable monomer (A) with a ter- or higher functional radical-polymerizable monomer (B) in the presence of 15 mol % to 170 mol % polymerization initiator (C), based on the sum of monomers (A) and (B).

Abstract: The present invention provides a process for producing a resin powder containing a radical polymer having a volume-average primary-particle diameter of 1 nm to 300 nm and containing no impurities such as surfactants by a simple procedure without via multistage reactions. The process for producing a resin powder (J) comprising a radical polymer obtained by polymerizing a bifunctional radical-polymerizable monomer (A) with a ter- or higher functional radical-polymerizable monomer (B) in the presence of 15 mol % to 170 mol % polymerization initiator (C), based on the sum of monomers (A) and (B).

Abstract: Disclosed is a process for producing a polymer of an unsaturated carboxylic acid or a derivative thereof, the process comprising polymerizing an unsaturated carboxylic acid or a derivative thereof in a water-soluble organic solvent-water mixture in the presence of at least one polymerization catalyst selected from the group consisting of a metal compound of the formulaL.sub.p.M.X.sub.q ( 1)wherein M is Ti, Zr, Hf or V, L is cyclopentazienyl, indenyl, fluorenyl or a derivative of these, X is halo, H, lower alkyl, lower alkoxyl, aryloxy, phenyl or benzyl, p and q each represents an integer including 0 and p+q is equal to the valence of M, and a metal compound of the formulaR.M.Y.sub.r ( 2)wherein M is defined above, R is a group formed by bonding, via a lower alkylene or di(lower alkyl)silylene group, two groups being cyclopentadienyl, indenyl, fluorenyl or a derivative of these, Y is halo, H, lower alkyl, lower alkoxyl, aryloxy, phenyl or benzyl, r is equal to the valence number of M minus 2.

Abstract: An organic polymer ferromagnetic material characterized in that the material comprises a polymer obtained by subjecting to plasma polymerization or oxidation polymerization a methane derivative having two substituents and represented by the formula ##STR1## wherein A is an electron accepting group, and B is an electron donating group, or by copolymerizing the methane derivative with a diarylmethane derivative represented by the formula ##STR2## wherein R.sup.1 is a substituted or unsubstituted phenyl group by plasma polymerization or oxidation polymerization.