Suspension polymerization method and particles obtained therewit

Details Suspension polymerization method and particles obtained therewit Suspension polymerization method and particles obtained therewit

1994-01-21

1998-02-10

Weber, Thomas R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263292, C08F 218

Patent

active

057170410

ABSTRACT:
The present invention provides a suspension polymerization method for producing a polymerized particle having cavities in the particle. The method includes the steps of: placing a continuous phase component of an aqueous medium in a continuous phase vessel and a dispersed phase component composed of a monomer composition and a liquid noncompatible to the monomer composition, wherein the liquid noncompatible to the monomer composition is suspended in the monomer composition, in a dispersed phase vessel; subsequently supplying continuously and simultaneously each of the dispersed phase component and the continuous phase component to an apparatus for providing a shear force; subsequently exerting a shear force on the dispersed phase component and the continuous component to form a suspension material including polymerizable liquid-drops of a desired size; subsequently leading the suspension material to a polymerization vessel; subsequently subjecting the suspension material in the polymerization vessel to a polymerization reaction to form a polymerized material; and subsequently drying the polymerized material to obtain the polymerized particle having the cavities in the particle.

REFERENCES:
patent: Re21245 (1939-10-01), Denton
patent: 4248746 (1981-02-01), Greiner
patent: 4900706 (1990-02-01), Sasaki et al.
patent: 4940682 (1990-07-01), Sasaki et al.
patent: 5139915 (1992-08-01), Moffat et al.
EPO Search Report dated Jul. 20, 1993.

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