Process for coating paper, paperboard, and molded fiber with a water-dispersible polyester polymer
AssigneeAdvanced Plastics Technologies Luxembourg S.A.
InventorsRobert A. Lee, Gerald A. Hutchinson, Charles P. Klass
Life of this patent
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Abstract
Disclosed are coated fiber-containing articles, including paper, paperboard, and molded fiber, and methods for preparing such articles. A preferred method comprises heating paperboard containing a polymeric binder to a temperature sufficient to remove at least some moisture from the paperboard; applying an aqueous dispersion or solution of at least one water-dispersible or water-soluble polymer to the paperboard product; heating the paperboard to at least partially cure the water-dispersible or water-soluble polymer; and cooling the paperboard to at least 160° F. to reduce the tackiness of the cured water-dispersible polymer.
Claims25
A continuous process for forming a hydroxy-phenoxyether polymer modified paperboard coated with a polyester polymer in an aqueous dispersion, comprising:
- impregnating or coating a paperboard with a solution, dispersion, or extruded coating of a hydroxy-phenoxyether polymer;
- heating the coated or impregnated paperboard for a sufficient time and temperature to reduce the moisture content;
- applying an aqueous dispersion of a water-dispersible polyester resin to at least one surface of the paperboard, and distributing the aqueous dispersion across the paperboard to remove excess dispersion and produce a generally uniform layer of the aqueous dispersion on said surface;
- heating said paperboard to at least partially cure said polyester;
- and
- cooling the paperboard to at least 160° F. to reduce the tackiness of said at least partially cured polyester.
A process for forming a hydroxy-phenoxyether polymer modified articles coated with a polyester polymer comprising;
- impregnating or coating an article with a solution, dispersion, or extruded coating of a hydroxy-phenoxyether polymer;
- heating the article for a sufficient time and temperature to reduce the moisture content to the desired level;
- applying an aqueous dispersion of a water-dispersible polyester resin to at least one surface of the article;
- and
- heating said article to a temperature and for a time sufficient to at least partially cure said polyester and dry said aqueous dispersion of the polyester;
- wherein the polyester on the article is at least partially cured to permit subsequent repulping of the article, and recycling of the article into recycled paper products that can be readily glued and printed.
A process for forming a coated article, comprising
- applying an aqueous dispersion with a water-dispersible polyester resin to at least one surface of an article, and wherein the article comprises fiber and hydroxy-phenoxyether polymer;
- heating said article to a temperature and for a time sufficient to at least partially cure said polyester and/or dry said aqueous dispersion of said polyester,
- wherein the polyester on the article is at least partially cured to permit subsequent repulping of the article, and recycling of the article into recycled paper products that can be readily glued and printed.
An article comprising:
- a substrate comprising fiber and hydroxy-phenoxyether polymer,
- a layer of at least a partially cured water-dispersible polyester resin on at least one surface of said substrate
- wherein the article is capable of being recycled and repulped.
Dependencies are inferred from the claim text.