Process for making high viscosity ink resins
AssigneeArizona Chemical Company
InventorsTheodore J. Williams, Robert R. Klein
Life of this patent
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Abstract
The specification discloses a process for making high viscosity gelled ink resins which exhibit improved properties. In a preferred embodiment, a precursor resin is conducted through an extruder with a cross-linking agent, preferably a heat reactive phenolic resin, to induce formation of covalent cross-link bonds in the resin producing a high viscosity resin which resists viscosity breakdown under high shear conditions. The resulting gelled ink resins may be used directly in making ink, obviating the need for further gelation and avoiding the use of conventional organo-metallic gelling agents.
Claims58
A process for making a high viscosity ink resin which comprises:
- introducing a precursor resin selected from the group consisting of rosin- and hydrocarbon-based resins into the entrance opening of an elongate reaction chamber;
- advancing the precursor resin through the reaction chamber from the entrance opening toward an exit opening thereof;
- continuously mixing the precursor resin as it is advanced through the reaction chamber with a non-metal containing cross-linking agent selected to induce formation of covalent cross-link bonds in the resin upon the application of sufficient energy to the mixture;
- heating the mixture as it is mixed and advanced through the reaction chamber at a temperature and for a period of time sufficient to cause the formation of covalent cross-link bonds in the mixture and to provide a substantially stable high viscosity ink resin;
- and
- conducting the ink resin from the exit opening of the reaction chamber.
A process for making a gelled ink resin which comprises:
- introducing a modified rosin-based resin into the entrance opening of an elongate reaction chamber having at least one mixing zone and at least one heating zone;
- advancing the resin through the mixing and heating zones of the reaction chamber from the entrance opening toward an exit opening thereof;
- continuously mixing the resin with a non-metal containing cross-linking agent in the mixing zone of the reaction chamber wherein the cross-linking agent is selected to induce formation of covalent cross-link bonds in the resin upon the application of sufficient energy to the resin/cross-linking agent mixture as the mixture is advanced through the reaction chamber;
- heating the mixture in the heating zone of the reaction chamber as the mixture is mixed and advanced through the reaction chamber at a temperature and for a period of time sufficient to cause the formation of covalent cross-link bonds in the mixture and to provide an at least partially gelled ink resin in the reaction chamber of substantially increased viscosity in relation to the resin initially introduced into the reaction chamber;
- and
- conducting the gelled resin from the exit opening of the reaction chamber, wherein the amount of cross-linking agent ranges from about 0.5 to about 15 wt. % based on the total reaction mass weight and wherein the resulting ink resin has a Gardner bubble viscosity of from about 180 to about 650 bubble seconds in about a 33.3 wt. % solution of resin in linseed oil at about 38.degree. C.
A method for making a gelled ink varnish resin which comprises reacting a precursor resin selected from the group consisting of rosin- and hydrocarbon-based resins with a non-metallic cross-linking agent to provide an at least partially gelled resin whereby the partially gelled resin has a Gardner bubble viscosity of at least about 130 bubble seconds at about 38.degree. C.
A process for making a high viscosity ink resin which comprises:
- introducing a hydrocarbon-based resin into the entrance opening of an elongate reaction chamber;
- advancing the resin through the reaction chamber from the entrance opening toward an exit opening thereof;
- continuously mixing the resin as it is advanced through the reaction chamber with a non-metal containing cross-linking agent selected to induce formation of covalent cross-link bonds in the resin upon the application of sufficient energy to the mixture;
- heating the mixture as it is mixed and advanced through the reaction chamber at a temperature and for a period of time sufficient to cause the formation of covalent cross-link bonds in the mixture and to provide a substantially stable high viscosity ink resin;
- and
- conducting the ink resin from the exit opening of the reaction chamber.
A process for making a high viscosity ink resin comprising:
- introducing a reactive precursor resin selected from the group consisting of reactive rosin- and hydrocarbon-based resins into the entrance opening of an elongate reaction chamber;
- advancing the reactive precursor resin through the reaction chamber from the entrance opening toward an exit opening thereof;
- heating the reactive precursor resin as it is advanced through the reaction chamber at a temperature and for a period of time sufficient to cause the formation of covalent cross-link bonds in the resin and to provide a substantially stable high viscosity ink resin;
- and
- conducting the ink resin from the exit opening of the reaction chamber.
Dependencies are inferred from the claim text.