White, conformable films for pressure-sensitive-labeling applications
US11801670B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2018 |
| Grant date | Oct 31, 2023 |
| Priority date | — |
| Expiry date | Aug 24, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/16
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A squeezable, white polypropylene film is disclosed having a novel balance of conformability, stiffness, modulus, opacity, and whiteness. The film includes an ABCBA structure having a core layer of polypropylene resin with an elastomeric copolymer and a cavitating agent. Two intermediate layers of polypropylene resin are present on either side, the intermediate layers optionally including an elastomeric copolymer and a pigmenting agent. Two polymer skin layers surround the two intermediate layers. The resins are co-extruded into a biaxially oriented film having a thickness between 40 to 70 pm for use in pressure-sensitive labeling applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.