Polymer compositions and uses thereof

C - Chemistry – Metallurgy – 08 – G

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C08G 63/21 (2006.01) C09D 11/10 (2006.01)

Patent

CA 2447628

A process comprising the steps of a) reacting in an esterification reaction (i) a plurality of different plyols with; (ii) a plurality of different polycarboxylic acids and/or precursors therefor; in a manner to retain a plurality of free hydroxy groups in the resultant polyester(s) and retain substantial amounts of un-crosslinked polyesters in the resultant product; followed by b) reacting substantially all of the free hydroxy groups present in the resultant mixture of polyesters with an acrylating agent; to form a mixture having a hydroxy (OH) number (measured using ASTM E222-73) of no more than about 100mg KOH/g. Use of the mixture as a composition for lithographic or flexographic inks.

Procédé comportant les étapes consistant à : a) faire réagir dans une réaction d'estérification (1) une pluralité de polyols différents avec (2) une pluralité d'acides polycarboxyliques différents et/ou de précurseurs de ceux-ci, de manière à retenir une pluralité de groupes hydroxy libres dans le(s) polyester(s) obtenus et à retenir des quantités substantielles de polyesters non réticulés dans le produit obtenu ; et b) faire réagir sensiblement tous les groupes hydroxy libres présents dans le mélange de polyesters obtenu avec un agent d'acrylation, afin de former un mélange présentant une valeur d'hydroxy (OH) (mesurée selon ASTM E222-73) ne dépassant pas environ 100 mg KOH/g. L'invention concerne également l'utilisation de ce mélange comme composition d'encres lithographiques ou flexographiques.

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