Bifunctional film and method for preparing the same
US11458715B2 · kind B2 · utility
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24Claims
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Key dates
| Filing date | Nov 6, 2019 |
| Grant date | Oct 4, 2022 |
| Priority date | — |
| Expiry date | Aug 20, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2535/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for preparing a bifunctional film, including: (a) drying a first polymer solution to form a film to form an anti-adhesion layer; and (b) drying a second polymer solution over the anti-adhesion layer to form a film to form an attachment layer. The first polymer solution includes a first hydrophobic solution and a first hydrophilic solution, and in the first polymer solution, the weight ratio of the solute of the first hydrophobic solution to the solute of the first hydrophilic solution is 1:0.01-1. Moreover, the second polymer solution consists of a second hydrophilic solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.