Use of polymer isoacetals in printing ink formulations
AssigneeKuraray Europe GmbH
InventorMichael Frank
Life of this patent
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Abstract
Printing ink formulations containing polyvinyl isoacetals as a binder component exhibit lower solution viscosity and higher binder Tg, allowing use of more binder and more pigment, thus increasing depth of color and printing speed, as well as lowering the risk of delamination and ruboff.
Claims9
In a printing ink composition containing a binder, the improvement comprising including at least one polyvinyl isoacetal as a binder, wherein the acetal group of the at least one polyvinyl isoacetal is derived from one or more aliphatic keto compounds containing 4 to 10 carbon atoms having at least one branch in a position alpha or beta to the keto group, and is prepared by simultaneous reaction of at least one polyvinyl alcohol with
- a) one or more aliphatic keto compounds containing 4 to 10 carbon atoms with at least one branch in the position alpha or beta to the keto group, and
- b) one or more further aliphatic keto compounds different from a) containing 2 to 10 carbon atoms.
In a printing ink composition containing a binder, the improvement comprising including a binder comprising a mixture of polyvinyl acetals comprising at least one polyvinyl isoacetal wherein the acetal group of the polyvinyl isoacetal is derived from one or more aliphatic keto compounds containing 4 to 10 carbon atoms with at least one branch in the position alpha or beta to the keto group, and at least one further polyvinyl acetal obtained by reacting polyvinyl alcohol with one or more further aliphatic keto compounds containing 2 to 10 carbon atoms and having no branch in a position alpha or beta to the keto group.
Dependencies are inferred from the claim text.