Protective film and sheet
US12104043B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2020 |
| Grant date | Oct 1, 2024 |
| Priority date | — |
| Expiry date | Jun 14, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/005
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A protective film that includes at least one of a transparent polyolefin resin layer and a surface protection layer, and that has excellent weather resistance and a low level of white turbidity, which is a factor that impairs design properties; and a sheet using the protective film. The protective film comprises at least a transparent polyolefin resin layer, wherein the transparent polyolefin resin layer contains a first hydroxyphenyltriazine-based ultraviolet absorber (UVA-A) having a structure represented by the general formula below. In the general formula, R1-R3 each independently represent a hydrogen atom, a methyl group, a phenyl group, or an alkoxy group, and at least two of R1-R3 are an alkoxy group having 8-18 carbon atoms, R4 and R5 each independently represent a hydroxyl group, a methyl group, or a hydrogen atom, and R6-R8 each independently represent a methyl group or a hydrogen atom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.