Title:
【発明の名称】ポリマー粒子
Document Type and Number:
Japanese Patent JPH02501047
Kind Code:
A
Abstract:
Controlled release microspheres of hydroxybutyrate polymer comprise active ingredient and hydroxybutyrate/hydroxyvalerate copolymer. The microspheres comprise a skin which is distinct from the general bulk of the microspheres, and this skin may have a porosity covering from 0-50% of the total surface area of the microsphere, this porosity being largely controlled by varying the hydroxyvalerate content of the polymer. The porosity of the interior of the microspheres can also be regulated. Control of the two porosities permits the attainment of a wide range of release rates for a wide range of active ingredients. The microspheres can be used in a wide variety of pharmaceutical, veterinary and agricultural applications.
Inventors:
Toulouse, matte
Turras, Roan W.
Turras, Roan W.
Application Number:
JP50426388A
Publication Date:
April 12, 1990
Filing Date:
May 24, 1988
Export Citation:
Assignee:
ICI Australia Operations Proprietary Limited
International Classes:
A01N25/28; A61K9/16; A61K9/50; A61K9/52; A61K9/58; A61K47/00; B01J13/02; (IPC1-7): A01N25/28; A61K9/58; B01J13/02
Attorney, Agent or Firm:
Aoki Akira (3 outside)