Method for the synthesis of copolymers for producing...

C - Chemistry – Metallurgy – 08 – F

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C08F 220/52 (2006.01) C08F 2/16 (2006.01) C08F 220/18 (2006.01)

Patent

CA 2529610

The invention relates to a method for producing polymethacrylimides in two steps: 1) radical copolymerization of (meth)acrylamides (A, (Me,H)HC=CHCONHR2) and alkyl(meth)acrylic esters (B) and optionally further ethylenically unsaturated monomers in the presence of an aqueous solvent. The monomers (A) include, in addition to acrylamide and methacrylamide, (meth)acrylamides that are substituted on their nitrogen group (R2 <> H). The monomers (B) are the (meth)acrylic esters of secondary or tertiary alcohols, preferably tert. butylmethacrylate. 2) Thermal or catalytic reaction of the copolymers produced in 1) to polymethacrylimide or for R2 <> H to N-substituted polymethacrylimides while alkenes are separated.

L'invention concerne un procédé de production de polyméthacrylimides en deux étapes. La première étape consiste en une copolymérisation radicalaire de (méth)acrylamides (A, (Me,H)HC=CHCONHR2) et d'esters alkyl(méth)acryliques (B) et éventuellement d'autres monomères éthyléniquement insaturés en présence d'un diluant contenant de l'eau. Les monomères (A) comprennent, en plus de l'acrylamide et du méthacrylamide, des (méth)acrylamides qui sont substitués au niveau de l'azote (R2 <> H). Les monomères (B) sont des esters (méth)acryliques d'alcools secondaires ou tertiaires, de préférence du tert-butylméthacrylate. La seconde étape consiste en une conversion thermique ou catalytique des copolymères obtenus à l'issue de la première étape en polyméthacrylimide ou en polyméthacrylimides N-substitués pour R2 <> H, avec élimination des alcènes.

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