Process for the preparation of halogenated (meth)acrylic...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 323/54 (2006.01) B01J 31/02 (2006.01) C07C 67/08 (2006.01) C07C 67/307 (2006.01) C07C 69/653 (2006.01) C07C 69/734 (2006.01) C07C 319/12 (2006.01) C07D 213/55 (2006.01) C07D 213/63 (2006.01) C07D 237/14 (2006.01) C07D 239/34 (2006.01) C07D 241/18 (2006.01) C07D 251/22 (2006.01) C07D 253/07 (2006.01) C07D 257/08 (2006.01) C08F 20/22 (2006.01) G02B 6/00 (2006.01) G02B 6/12 (2006.01) C07B 61/00 (2006.01)

Patent

CA 2212733

The present invention is directed to a process for the preparation of (meth)acrylates of halogenated alcohols by direct esterification of said alcohols with (meth)acrylic acid (chloride) wherein at least 2,6-substituted pyridine derivative is used as a polymerization inhibitor at room temperature or lower. Suitable at least 2,6-substituted pyridine derivatives are 2,6-lutidine, 2,4,6-collidine or 2,6-di-tert butyl-4-methyl pyridine. With the halogenated (meth)acrylate esters prepared with the process according to the invention, very pure homo- and copolymers can be prepared, resulting in polymers having a low optical loss of 0.1 dB/cm or lower at 1300 nm and lower than 0.4 dB/cm at 1550 nm.

L'invention concerne une méthode de préparation de (méth)acrylates d'alcools halogénés par estérification directe des alcools à l'aide de l'acide (méth)acrylique, où un dérivé de la pyridine avec au moins substitution en 2,6 sert comme inhibiteur de polymérisation à la température de la pièce ou moins. Parmi les dérivés de la pyridine avec au moins substitution en 2,6, qui conviennent, il y a la 2,6-lutidine, la 2,4,6-collidine et la 2,6-di-tert butyl-4-méthylpyridine. On peut, à partir des esters (méth)acrylates halogénés ainsi préparés, obtenir des homopolymères et des copolymères très purs, soit des polymères avec une faible perte optique, de 0,1 dB/cm ou moins à 1300 nm, et de 0,4 dB/cm ou moins à 1550 nm.

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