Optical brightening compositions
USRE46913E1 · kind E1 · reissue
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13References
18Claims
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Key dates
| Filing date | Apr 3, 2017 |
| Grant date | Jun 26, 2018 |
| Priority date | — |
| Expiry date | Apr 3, 2037 |
Classification
- Technology area (CPC —)General
Abstract
The instant invention relates to mixed salts of optical brighteners of formula (1), wherein M represents a mixture of Mg2+ with another cation, which provide for superior optical brightening effects when applied to the surface of paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.