Abstract
As a part of continuing studies on the change in solubility characteristics of water-borne flexo ink binders, the thermal behaviour of unneutralized and partially or completely neutralized acrylic copolymer and styrene-maleic anhydride copolymer has been examined relative to a water-based ink binder having no carboxylic acid or anhydride group. Films of ink binder and the inks prepared with these binders were aged at 105 °C before or after adding sodium hydroxide. Solubility behaviour as determined by a swelling study revealed that water solubility of acrylic binder decreased significantly after acid group neutralization and ageing. Styrene-maleic anhydride copolymer also showed similar behaviour but the effect on solubility was less significant. Thermogravimetric and FTIR analyses results suggested a crosslinking reaction by acyclic anhydride formation due to alkali catalysed heating of acrylic and maleic binders. By contrast, the presence of univalent metal ion in a sulfopolyester-based flexo ink binder did not show any crosslinking effect and the water solubility of this binder remained practically unchanged.
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