Method of preparing a latent hardener with improved storage stability through a dry surface treatment
US11286334B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Feb 12, 2020 |
| Grant date | Mar 29, 2022 |
| Priority date | — |
| Expiry date | Feb 22, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J163/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for preparing a latent hardener includes, in the order recited, introducing a hardener into a dry mixer that is a high-energy-type mixer; injecting carbon dioxide gas or an inert gas into the dry mixer; and mechanochemically deactivating only a surface of the hardener using the dry mixer. The hardener may be an amine-based adduct, an imidazole-based adduct, dicyandiamide, a dihydride-based compound, a dichlorophenyl dimethylurea compound and combinations thereof. The inert gas may be helium, nitrogen, argon, neon, krypton, and combinations thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.