Multilayer polyurethane protective films
US12377641B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2022 |
| Grant date | Aug 5, 2025 |
| Priority date | — |
| Expiry date | Feb 24, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09J2483/00
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to multilayer films used to protect a surface, in particular, to such films used to protect surfaces of articles e.g., mobile electronics display protections, smartphones, tablets), industrial touch screens (e.g. machine interfaces), UV stable surfaces and glass protections for machine housings and cockpits (e.g. caterpillars, dumpers), etc.), and, more particularly, to such a multilayer protective film backed by a silicone-based pressure sensitive adhesive (PSA) and having either an aliphatic polyurethane layer or an aliphatic thermoplastic polyurethane layer on top of an aliphatic thermoplastic polyurethane layer, where the two aliphatic polyurethane layers have different physical and/or chemical properties. The present invention also relates to an article that is protected by the multilayer film as well as a method for making the multilayer protective film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.