Preparation of vesiculated core/shell polymeric particles

Details Preparation of vesiculated core/shell polymeric particles Preparation of vesiculated core/shell polymeric particles

1991-03-21

1993-07-20

Thibodeau, Paul J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

428407, 428515, 428523, 521 57, 521 60, 521 62, 521 63, 525201, 525902, B32B 516

Patent

active

052292096

ABSTRACT:
A process for the manufacture of core/shell polymer particles comprises forming a core particle containing acid functionality, a first shell around said core of a copolymer of a nonionic monoethylenically unsaturated aromatic monomer and a copolymerisable polar monomer in an amount of at least 15% by weight of the copolymer and having a solubility in water at 20.degree. C. of at least 1% by weight and a second shell around said first shell of a polymer or copolymer of a nonionic monomer having a solubility in water at 20.degree. C. of less than 1% by weight and swelling the particle with a non-volatile alkali to generate one or more vesicles.
Preferably each shell contains a polymer or copolymer of styrene.

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