Methods for reducing amine odor in paper
AssigneeBayer Aktiengesellschaft
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.
Claims10
A method comprising reducing the level of alkyl amines emitted by sized paper by
- (a) providing a paper that has been sized with a sizing emulsion comprising
- (1) a hydrophobic sizing agent, and
- (2) a water-soluble polymer that (A) contains ammonium groups in which substantially all of the ammonium groups are attached by at least two chemical bonds to the polymer and (B) has a weight average molecular weight of at least about 1,000,000, wherein
- (i) substantially all of the ammonium groups of the sized paper are attached by at least two chemical bonds to the polymer having a weight average molecular weight of at least about 1,000,000, and
- (ii) the sizing emulsion and the sized paper are substantially free of ammonium groups attached to non-polymeric substances, and
- (b) exposing said paper to a liquid at a pH of at least about 8.
Dependencies are inferred from the claim text.