One-component toughened epoxy adhesives with improved adhesion to oily surfaces and high wash-off resistance
US11034869B2 · kind B2 · utility
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16References
12Claims
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Key dates
| Filing date | Jul 23, 2020 |
| Grant date | Jun 15, 2021 |
| Priority date | — |
| Expiry date | Jul 23, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B32/182
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Epoxy adhesives include a latent curing agent, a reactive toughener having capped isocyanate groups, and certain urea compounds. The toughener is made by chain extending and capping a mixture of isocyanate-terminated prepolymers. The prepolymers include an isocyanate-terminated polyether and an isocyanate-terminated diene polymer. The adhesives have excellent wash-off resistance and excellent ability to adhere to oily substrates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.