Water-retaining and optical-brightener-activating polymer composition, paper coating colors and sheets of coated paper thus obtained
US6521701B2 · kind B2 · utility
1Cited by
10References
17Claims
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Key dates
| Filing date | Jul 9, 2001 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Jul 9, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31895
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A stable aqueous liquid polymer composition, which comprises:(i) at least one polyvinyl alcohol (PVA) which has an Ostwald viscosity less than 5 mPa·s corresponding to a degree of polymerization less than 600 and a molar percentage of hydrolysis ranging from 70 to 100 measured from the ester value (DIN 53401), corresponding to a molar percentage of vinyl acetate units from 30 to 0, and(ii) at least one water-soluble polymer at neutral or alkaline pH, the composition controlling the activation of optical brighteners, water retention and viscosities of paper coating colors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.