Patent ID: 6491790
Filing Date: 2002-12-10
Classification: B32B,D21H

Abstract:
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.