Method for the production of plane-parallel platelets by...

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/00 (2006.01) C09C 1/62 (2006.01) C09C 1/64 (2006.01) C23C 14/00 (2006.01) C23C 14/02 (2006.01)

Patent

CA 2446428

A new method is proposed for the production of plane-parallel platelets, comprising the steps a) vapour-deposition, at a pressure below atmospheric pressure, of a separating agent onto a carrier to produce a separating agent layer, b) vapour-deposition, at a pressure below atmospheric pressure, of at least one product layer onto the separating agent layer, c) dissolution of the separating agent layer in a solvent and production of a suspension in which the at least one product layer is present in the form of plane-parallel platelets, in which method the separating agent is selected from the group consisting of anthracene, anthraquinone, acetamidophenol, acetylsalicylic acid, camphoric anhydride, benzimidazole, benzene-1,2,4-tricarboxylic acid, biphenyl-2,2-dicarboxylic acid, bis(4-hydroxyphenyl)-sulfone, dihydroxyanthraquinone, hydantoin, 3- hydroxybenzoic acid, 8-hydroxyquinoline-5-sulfonic acid monohydrate, 4-hydroxycoumarin, 7- hydroxycoumarin, 3-hydroxynaphthalene-2-carboxylic acid, isophthalic acid, 4,4-methylene-bis-3- hydroxynaphthalene-2-carboxylic acid, naphthalene-1,8-dicarboxylic anhydride, phthalimide and its potassium salt, phenol-phthalein, phenothiazine, saccharin and its salts, tetraphenylmethane, triphenylene, triphenylmethanol, and also mixtures of at least two of those substances. Separating agents that have been found to be especially suitable are aromatic compounds having at least one benzene ring. The present invention relates also to the use of the plane- parallel platelets thereby produced and also to the products obtainable using such methods.

L'invention concerne un nouveau procédé permettant de produire des plaquettes à faces parallèles, comprenant les étapes suivantes: a) vaporisation d'un agent de séparation sur un support, pour produire une couche d'agent de séparation à une pression inférieure à la pression atmosphérique; b) vaporisation d'au moins une couche de produit sur la couche d'agent de séparation, à une pression inférieure à la pression atmosphérique; et c) dissolution de la couche d'agent de séparation dans un solvant et production d'une suspension dans laquelle la ou les couche(s) de produit se présentent sous la forme de plaquettes à faces parallèles. Ce procédé se caractérise en ce que l'agent de séparation est sélectionné dans le groupe constitué de: anthracène, anthraquinone, acétaminophénole, acide acétylsalicylique, anhydride d'acide camphrique, benzimidazole, acide benzol-1,2,4-tricarboxylique, acide biphényl-2,2-dicarboxylique, bis(4-hydroxyphényl)-sulfone, dihydroxyanthraquinone, acide 3-hydroxybenzoïque, monohydrate d'acide 8-hydroxyquinoline-5-sulphonique, 4-hydroxycumarin, 7-hydroxycumarin, acide3-hydroxynaphtaline-2-carboxylique, acide isophtalique, acide 4,4-méthylène-bis-3-hydroynaphtaline-2-carboxylique, anhydride d'acide naphtaline-1,8-dicarboxylique, phtalimide et son sel de potassium, phénolphtaline, phénothiazine, saccharine et ses sels, tetraphénylméthane, triphénylène, triphénylméthanole, ainsi que des mélanges d'au moins deux de ces substances. Des composés aromatiques présentant au moins un cycle benzénique constituent des agents de séparation particulièrement appropriés. La présente invention concerne également l'utilisation des plaquettes à faces parallèles ainsi produites, ainsi que les produits pouvant être obtenus selon un tel procédé.

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