Methods for reducing amine odor in paper
AssigneeBayer Chemicals AG
InventorsRobert J. Proverb, Michael J. Scanlon
Life of this patent
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Abstract
A method of reducing the level of malodorous amines emitted by paper when exposed to an alkaline environment is provided, which comprises making the paper so that it does not contain ammonium groups that are bonded to any polymer contained in the paper by only one chemical bond. Laminates which emit reduced levels of amines and which are comprised of this paper are also provided. In a preferred embodiment, the paper is sized with a sizing emulsion comprised of alkenyl succinic anhydride and a cationic water-soluble polymer having ammonium groups that are attached to the polymer by at least two chemical bonds.
Claims8
A method for sizing paper, comprising intermixing a sizing emulsion comprised of (i) alkenyl succinic anhydride, alkyl ketene dimer, or mixtures thereof, and (ii) a water-soluble polymer comprised of ammonium groups that are attached to said polymer by at least two chemical bonds, with a paper stock, or applying said sizing emulsion to a paper web, and forming paper from said paper web or said paper stock, wherein said sizing emulsion is used in an amount effective to size said paper, and wherein said paper, when contacted with a liquid having a pH of about 8 or greater, emits a lower level of alkyl amines than when said sizing emulsion is comprised of, instead of said (ii), the same amount of a water-soluble polymer comprised of ammonium groups that are attached to said polymer by only one chemical bond.
Dependencies are inferred from the claim text.