Low-friction and low-adhesion materials and coatings
US10344244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2015 |
| Grant date | Jul 9, 2019 |
| Priority date | — |
| Expiry date | May 11, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2050/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed are materials that possess both low adhesion and the ability to absorb water. The material passively absorbs water from the atmosphere and then expels this water upon impact with debris, to create a self-cleaning layer. The lubrication reduces friction and surface adhesion of the debris (such as an insect), which may then slide off the surface. The invention provides a material comprising a continuous matrix including a polymer having a low surface energy (less than 50 mJ/m2) and a plurality of inclusions, dispersed within the matrix, each comprising a hygroscopic material. The continuous matrix and the inclusions form a lubricating surface layer in the presence of humidity. The material optionally contains porous nanostructures that inject water back onto the surface after an impact, absorbing water under pressure and then releasing water when the pressure is removed. The material may be a coating or a surface, for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.