C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 73/16 (2006.01) C09D 179/08 (2006.01) H01B 3/30 (2006.01)
Patent
CA 2271138
The invention relates to a method for the production of polyester imide resins containing hydroxyl- and carboxyl groups, comprising as monomer components: (A) imide-forming compounds with at least two primary amino groups and/or at least two isocyanate groups or imide-forming compounds with at least one primary amino group and/or at least one isocyanate group and at least one further functional group selected from hydroxy-, carboxy- and/or carboxylic acid anhydride, (B) polycarboxylic acids and/or their anhydrides and/or their esters; and (C) polyols, characterized in that (I) the (A) component is reacted with part of the (B) component to form a polyimide; (II) the polyimide obtained in accordance with step (I) is reacted with the (C) component to form a polyester imide; and finally (III) the polyester imide obtained in accordance with step (II) is reacted with the remaining part of the (B) component giving the polyester imide containing hydroxyl- and carboxyl groups. Furthermore, the invention comprises the use of the polyester imides produced by this method as binding agents and wire enamels, containing polyester imides with hydroxyl- and carboxyl groups with an acid number 80 mg KOH/g, which can be produced by the method given in this invention.
L'invention concerne un procédé permettant de préparer des résines de polyester-imides contenant des groupes hydroxyle et carboxyle, qui comprennent comme constituants monomères: (A) des composés formateurs d'imides comportant au moins deux groupes amino primaires et/ou au moins deux groupes isocyanates ou bien des composés formateurs d'imides comportant au moins un groupe amino primaire et/ou au moins un groupe isocyanate et au moins un autre groupe fonctionnel, sélectionné parmi hydroxy, carboxy et/ou anhydride d'acide carboxylique; (B) des acides polycarboxyliques et/ou leurs anhydrides et/ou leurs esters: ainsi que (C) des polyols. Ce procédé se caractérise en ce que (I) le constituant (A) est mis à réagir avec une partie du constituant (B) pour former un polyimide; (II) le polyimide obtenu selon l'étape (I) est mis à réagir avec le constituant (C) pour former un polyester-imide et pour finir, (III) le polyester-imide obtenu selon l'étape (II) est mis à réagir avec la partie résiduelle du constituant (B) pour former un polyester-imide contenant des groupes hydroxyle et carboxyle. L'invention concerne en outre l'utilisation des polyester-imides préparés selon l'invention, comme liants et vernis pour fils de fer, contenant des polyesterimides qui comprennent des groupes hydroxyle et carboxyle avec un indice d'acide ?80 mg KOH/g, pouvant être obtenus selon ledit procédé.
Glasper Brian W.
Lienert Klaus-Wilhelm
Rix Geoffrey C.
Altana Electrical Insulation Gmbh
Dr. Beck & Co. Ag
Fetherstonhaugh & Co.
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