Patent 5066331 Issued on November 19, 1991. Estimated Expiration Date: December 21, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
524/272, Solid polymer derived from at least one ethylenic compound containing a carboxylic acid or derivative106/31.73, Rosin or derivative containing106/500, Rosin, natural resin or derivative, e.g., shellac, dammar, colophony, turpentine, etc.527/600, FROM NATURAL RESIN OR DERIVATIVE REACTANT EXCLUDING TALL OIL OR DERIVATIVE530/210, Rosin or derivative used as starting material in process, or product thereof (e.g., using gum rosin, wood rosin, solid tall oil rosin, etc.)530/211, Polymerization or product thereof (e.g., dimer rosin, etc.)530/221Nitrogen containing material used in the process, or product thereof
A water-soluble resin for packaging ink comprising the reaction product of fumarated or maleated rosin and a compound containing two secondary amine groups is disclosed. A resin with a higher softening point may be obtained by substituting a dicarboxylic acid, such as adipic acid or isophathalic acid, for part of the fumarated or maleated rosin. Water varnishes, pigment bases, and water based inks containing the resin are disclosed.