Stable aqueous dispersions for sizing paper
US6380299B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Jul 26, 2020 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/74
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for preparing a paper sizing agent which has improved retention on paper and which is an aqueous dispersion stabilized with a polymer, including the steps of (a) dispersing a resin which is one of a colophonium resin or a compound derived from a colophonium resin in water containing a synthetic emulsifier present in an amount which is a minimal amount effective to prepare a metastable dispersion of the resin so that impairment of sizing action by the synthetic emulsifier is minimized; (b) immediately cooling the metastable dispersion to a cooled temperature; and (c) reacting the metastable dispersion while at a cooled temperature with a polymer which is one of a polymer solution or a polymer dispersion to form a stable dispersion, wherein direct dispersion of the polymer with the resin is avoided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.