Thermosetting size press composition
US4797176A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Aug 10, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31964
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A thermosetting size applyable to paper in a size press and curable at a temperature not in excess of about 280.degree. F. for 10 seconds is disclosed. This size comprises an aqueous emulsion comprising water having suspended therein aqueous emulsion copolymer particles of monoethylenically unsaturated monomers comprising hydroxy-functional monomer having an hydroxy number of at least about 20, and the balance of the monomers provides a water insoluble polymer having a glass transition temperature of from about -20.degree. C. to about 50.degree. C. The emulsion has a pH greater than about 2.5, preferably from 4.0 to 7.0, and a stoichiometric deficiency of an aminoplast cross-linking agent is used for cure. An acid curing catalyst is uniformly distributed in the size to speed the cure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.