EP0209403A2
Expired / Lapsed
EP
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Process for preparing ultrafine particles of organic compounds
Assignee: Japan Science and Technology Agency
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Filing: 1986-04-22
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Granted: —
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Expires: 2006-04-22
Abstract
Abstract A method for manufacturing ultrafine particles of hardly water-soluble or water-insoluble organic compounds is disclosed herein, and the method comprises heating and evaporating the organic compound in a vacuum vessel in which an inert gas is introduced in a desired pressure, then condensing and depositing the vaporized organic compound on a recovering means cooled, the resulting ultrafine particles exhibiting a high negative zeta potential sufficient to form a stable water dispersion thereof.
Inventors
- 👤 Hideki Toyotama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 23:27
CPC Classifications
A; A61; A61K; A61K9/00; A61K9/14; B; B01; B01D; B01D3/00; B01D3/34; B01D3/343; B01D7/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
A method for preparing ultrafine particles of an organic compound having a good affinity to a dispersion medium comprises the steps of: a) heating and evaporating the organic compound in a vacuum vessel while controlling the inert gas pressure in the vessel; b) condensing the resulting vapour and depositing on a recovering plate in the vessel.
Claim 2
Independent Claim
56 words
A method for preparing ultrafine particles of an organic compound having a good affinity to a dispersion medium comprises the steps of: a) heating and evaporating the organic compound in a vacuum vessel while controlling the inert gas pressure in the vessel; b) condensing the resulting vapour and depositing on a recovering plate in the vessel.
Claim 3
Dependent Claim
32 words
A method for preparing ultrafine particles of an organic compound according to claim 1 wherein the inert gas is argon or nitrogen and the pressure thereof is controlled at highest 10 Torr.
Claim 4
Dependent Claim
35 words
A method for preparing ultrafine particles of an organic compound according to claim 2 wherein the organic compound is a member selected from the group consisting of water-insoluble or hardly water-soluble medicines, vitamins and hormones.
Claim 5
Dependent Claim
63 words
A method for preparing ultrafine particles of an organic compound according to claim 3 wherein the organic compound is a member selected from the group consisting of -bromoisovaleroylurea, barbital, phenobarbital, phenobarbital sodium, phenytoin, carbamazepine, haloperidol, diazepam, chlormezanone, phenacetin, acetaminophene, aspirin, ethenzamide, phenylbutazone, indomethacin, mepirizole, probenecid, lidocaine, epinephrine, cyproheptadine hydrochloride, digitoxin, sulfamonomethoxine, tolubutamide, chloramphenicol, ethyl p-hydroxybenzoate, vitamin B 13 , cortisone acetate and predonisone.
Claim 6
Dependent Claim
35 words
A method for preparing ultrafine particles of an organic compound according to claim 1 wherein the organic compound is a member selected from the group consisting of anthracene, pyrene, metal phthalocyanine, merocyanine, ferrocene and carbazole.
Claim 7
Dependent Claim
38 words
A method for preparing ultrafine particles of an organic compound according to claim 1 wherein the organic compound is a member selected from the group consisting of polyvinyl chloride, polyvinylalcohol, polyethylene, polystyrene, polyvinylpyrrolidone, polyvinylcarbazole, polythyleneterephthalate, polyvinylidenechloride and polymethylmethacrylate.
Claim 8
Dependent Claim
25 words
A water dispersion comprises ultrafine particles of a water-insoluble or hardly water-soluble organic compound, the particle size of which is at largest 4jtm and water.
Claim 9
Dependent Claim
25 words
A water dispersion comprises ultrafine particles of a water-insoluble or hardly water-soluble organic compound, the particle size of which is at largest 4jtm and water.
Claim 10
Dependent Claim
24 words
A water dispersion as set forth in claim 7 wherein the organic compound is a water insoluble or hardly water-soluble medicine, vitamine or hormone.
Claim 11
Dependent Claim
59 words
A water dispersion as set forth in claim 8 wherein the organic compound is a member selected from the group consisting of α -bromoisovaleroylurea, barbital, phenobarbital, phenobarbital sodium, phenytoin, carbamazepine, haloperidol, diazepam, chlormezanone, phenacetin, acetaminophene, aspirin, ethenzamide, phenylbutazone, indomethacin, mepirizole, probenecide, lidocaine, epinephrine, cyproheptadine hydrochloride, digitoxin, sulfamonomethoxine, tolubutamide, chloramphenicol, ethyl p-hydroxybenzoate, vitamin B 13 , cortisone acetate and predonisone.
Claim 12
Dependent Claim
30 words
A water dispersion as set forth in claim 7 wherein the organic compound is a member selected from the group consisting of anthracene, pyrene, metal phthalocyanine, merocyanine, ferrocene and carbazole.
References Cited (Backward Citations)
No citation records indexed.
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