Process for making polymer matrix capsules containing large hydr

Details Process for making polymer matrix capsules containing large hydr Process for making polymer matrix capsules containing large hydr

1995-09-06

1998-05-19

Mullis, Jeffrey

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

264 43, 264 433, B01J 1304

Patent

active

057531528

ABSTRACT:
The present invention relates to a process for preparing matrix capsules having hydrocarbon cores sufficiently large to contain large size particle actives which process comprises dispersing actives in hydrocarbon core material, and dispersing the active containing hydrocarbon in a polymer solution to form a polymer matrix emulsion of drops of said core material in said solution. The key to the invention is to obtain the dispersion by utilizing low shear rates previously uncontemplated using the standard shearing machinery of the art. This in turn is accomplished by maintaining the core within defined rheological parameters. By using lower shear rates, applicants were unexpectedly able to prepare capsules capable of stably incorporating large size actives in the core.

REFERENCES:
patent: 4090973 (1978-05-01), Maguire et al.
patent: 4801544 (1989-01-01), Munk
patent: 4906396 (1990-03-01), Falholt et al.
patent: 5035900 (1991-07-01), Langley et al.
patent: 5441660 (1995-08-01), Tsaur et al..
patent: 5460817 (1995-10-01), Langley et al.

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