Build-up suppressor agents, compositions containing them and...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 14/04 (2006.01) B01J 3/00 (2006.01) C08F 2/00 (2006.01) C08F 14/06 (2006.01) C08F 18/08 (2006.01) C08F 114/06 (2006.01) C08F 118/08 (2006.01) C08F 214/06 (2006.01) C08F 218/08 (2006.01) C08L 61/06 (2006.01)

Patent

CA 2274466

The invention relates to build-up agents which comprise a condensation product among an aldehyde, a phenol compound and an aromatic carboxylic acid, hydroxy- substituted on the aromatic nucleus. The products are particularly effective in reducing or suppressing the build-up formation in the polymerization of vinyl chloride or vinyl acetate, other copolymerizable substances being optionally present. Further objects of the invention are compositions containing the above agents, their use as build-up agents, methods for their preparation and the products obtained therefrom, the polymerization processes carried out in reactors whose inner walls are coated with these agents and the polymers obtained from these processes.

L'invention concerne des agents d'accumulation qui comprennent un condensat sélectionné parmi un aldéhyde, un composé phénolé et un acide carboxylique aromatique, hydroxy-substitué sur le noyau aromatique. Ces produits sont particulièrement efficaces pour réduire ou supprimer la formation d'accumulation lors de la polymérisation du chlorure de vinyle ou de l'acétate de vinyle, d'autres substances copolymérisables pouvant être éventuellement présentes. L'invention traite aussi de compositions à base des agents susmentionnés, de leur utilisation comme agents d'accumulation, de procédés pour leurs préparations et des produits obtenus à partir de ces derniers. L'invention a aussi pour objet les procédés de polymérisation effectués dans les réacteurs dont les parois intérieures sont recouvertes de ces agents et les polymères obtenus à partir de ces procédés.

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