Process for producing mouldings from (meth)acrylate...

B - Operations – Transporting – 29 – C

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Details

B29C 45/00 (2006.01) A61K 31/365 (2006.01) A61K 31/4422 (2006.01) B29C 47/76 (2006.01)

Patent

CA 2418316

The invention relates to a process for producing mouldings by injection moulding the steps in the process being a) melting and mixing of a (meth)acrylate copolymer composed of from 85 to 98% by weight of C1- C4-alkyl (meth)acrylates capable of free-radical polymerization and from 15 to 2% by weight of (meth)acrylate monomers having a quaternary ammonium group in the alkyl radical, with from 10 to 25% by weight of a plasticizer, and also from 10 to 50% by weight of a dryers [sic] and/or from 0.1 to 3% by weight of a release agent, and, where appropriate, with other conventional pharmaceutical additives or auxiliaries and/or with an active pharmaceutical ingredient, b) devolatilizing the mixture at temperatures of at least 120°C, thus reducing the content of the low-boiling constituents with a vapour pressure of at least 1.9 bar at 120°C to not more than 0.5% by weight, and c) injecting the devolatilized mixture at a temperature of from 80 to 160°C into the mould of an injection moulding system and removing the resultant moulding from the mould.

L'invention concerne un procédé servant à la production de corps moulés par moulage par injection et comprenant les étapes suivantes : a) fusion et mélange d'un copolymère de (méth)acrylate, composé de 85 à 98 % en poids d'esters d'alkyle C1 à C4 à polymérisation radicalaire de l'acide acrylique ou méthacrylique et de 15 à 2 % en poids de monomères de (méth)acrylate présentant un groupe ammonium quaternaire dans le reste alkyle, avec 10 à 25 % en poids d'un plastifiant, 10 à 50 % en poids d'un agent anti-adhérent ou 0,1 à 3 % en poids d'un agent de démoulage et, éventuellement, d'autres additifs ou agents auxiliaires pharmaceutiquement courants ou un principe actif pharmaceutique ; b) dégazage du mélange à des températures d'au moins 120 ·C, la proportion des constituants à point d'ébullition bas étant alors réduite à au plus 0,5 % en poids avec une pression de vapeur d'au moins 1,9 bar à 120 ·C ; c) injection du mélange dégazé à une température comprise entre 80 et 160 ·C dans le moule d'une unité de moulage par injection et démoulage du corps moulé obtenu.

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