High efficiency wet strength resins from new cross-linkers
AssigneeGeorgia-Pacific Chemicals LLC
InventorsClay E. Ringold, Cornel Hagiopol, Dexter C. Johnson
Life of this patent
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Abstract
Compositions and methods related to new wet strength resins are provided. By using functionally-symmetrical cross-linkers and mono-functional modifiers, and separating the steps of reacting a prepolymer with the cross-linkers from the reaction of intermediate cross-linked prepolymer with epichlorohydrin, new wet strength resin products are provided having improved properties.
Claims20
A strengthening resin comprising a polyamine partially crosslinked with a bridging moiety and having azetidinium ions and a charge density of at least 2.4 mEq/g of solids.
A process for strengthening paper, comprising contacting a plurality of fibers with a strengthening resin comprising a polyamine partially crosslinked with a bridging moiety and having azetidinium ions and a charge density of at least 2.4 mEq/g of solids.
A strengthening resin, comprising a polyamidoamine partially crosslinked with a bridging moiety and having azetidinium ions, a charge density of about 2.5 mEq/g of solids to about 4 mEq/g of solids, an azetidinium equivalent weight of 2,000 to about 3,500, a weight average molecular weight of 900,000 to about 1,700,000, and contains less than 10,000 ppm of 1,3-dichloro-2-propanol, wherein the bridging moiety is derived from a functionally symmetric cross-linker comprising a di-acrylate compound, a bis(acrylamide) compound, a di-epoxide compound, a polyazetidinium compound, N,N′-methylene-bis-methacrylamide, a poly(alkylene glycol) diglycidyl ether, or any combination thereof, and wherein the azetidinium ions are formed by reacting epichlorohydrin and the polyamidoamine partially crosslinked with the bridging moiety.
Dependencies are inferred from the claim text.