Stabilized compositions comprising leuco compounds
US11261403B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2019 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Sep 23, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D2111/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition comprising: (a) a leuco composition; and (b) a stabilizing amount of an antioxidant composition. The antioxidant composition comprises at least one sterically hindered phenol and at least one substituted diarylamine, and the mole ratio of the hindered phenol to the substituted diarylamine is greater than 1:1. In another embodiment, a composition comprises (a) a leuco composition and (b) an antioxidant composition; and optionally (c) a solvent composition. The combined mass of the leuco compounds and antioxidants present in the composition is 10% or more of the total mass of the composition, and (b) the molar ratio of antioxidants present in the composition to leuco compounds present in the composition is greater than 1:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.