Protective sealable coating compositions

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 3/09 (2006.01) C09D 133/00 (2006.01) C09D 163/00 (2006.01) C09D 167/00 (2006.01) C09D 175/00 (2006.01)

Patent

CA 2686021

A dispersion of polymer microparticles in organic liquid, the polymer comprising the reaction product of i) from 2 to 40 parts by weight of a first polymer being polypropylene polymer having sufficient carboxylic acid and/or carboxylic acid anhydride groups equivalent to an acid value of from 2 to 50 mg KOH/g nv polymer and ii) from 60 to 98 parts by weight of a second polymer having a molar excess of functional groups capable of reacting with the carboxylic acid and/or carboxylic acid anhydride groups of the polypropylene polymer and wherein the organic liquid is chosen to be a good solvent for the second polymer and a poor solvent for the polypropylene polymer.

L'invention porte sur une dispersion de microparticules de polymère dans un liquide organique, ledit polymère est le produit de réaction de i) de 2 à 40 parties en poids d'un premier polymère de polypropylène comportant suffisamment de groupes d'acide carboxylique et/ou d'acide carboxylique anhydride équivalant à une valeur acide de 2 à 50 mg de KOH/g (non volumique) de polymère, et ii) de 60 à 98 parties en poids d'un deuxième polymère ayant un excès molaire de groupes fonctionnels pouvant réagir avec les groupes d'acide carboxylique et/ou d'acide carboxylique anhydride du polymère de polypropylène. Le liquide organique est sélectionné pour être un bon solvant du deuxième polymère et un mauvais solvant du polymère de polypropylène.

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