Substantially flat surfaced vinyl polymer emulsion particles hav

Details Substantially flat surfaced vinyl polymer emulsion particles hav Substantially flat surfaced vinyl polymer emulsion particles hav

1990-04-12

1992-07-21

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428402, B32B 300

Patent

active

051321599

ABSTRACT:
Substantially flat surfaced emulsion particles polymerized vinyl monomer, having a concavity in at least one of the flat surfaces, a diameter D of from 0.1 to 5.0 .mu.m, and a particle diameter thickness d ratio (d/D) of 1.2 to 5.0, prepared by the step of (1) aqueous emulsion polymerizing a first vinyl monomer or mixture of monomers (a) to form vinyl polymer seed particles; and (2) aqueous emulsion polymerizing a second vinyl monomer or mixture of monomers (b) in the presence of the vinyl polymer seed particles and a non-aqueous organic solvent having a surface tension to water at 20.degree. C. of 48 dyne/cm or more, in a weight ratio of monomer (a) to monomer (b) of 0.5/99.5 to 50/50; and are useful in high performance recording material, paint compositions and paper coating compositions.

REFERENCES:
patent: 4948772 (1990-08-01), Hoshino et al.

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