Polyester-starch sized paper, sizing composition, and process therefor
US4251402A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1979 |
| Grant date | Feb 17, 1981 |
| Priority date | — |
| Expiry date | Jul 30, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/28
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
There is disclosed a cellulosic material such as paper or paperboard surface-sized with an aqueous dispersion of a combination of degraded starch or a starch derivative and a branched-chain, water-dispersible polyester condensation product. Said polyester is derived from the reaction of a dicarboxylic reactant, a diol or polyoxyalkylene glycol, and a phosphorus acid reactant wherein said polyester has a carboxylic acid number of about 5 to about 15 and an average molecular weight of about 4,000 to about 11,000. Mixtures of said starch and said polyester when used to surface-size cellulosic materials impart water resistance thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.