Multilayer coextruded shrink labels of oriented polystyrene film containing small rubber particles and low rubber particle gel content and block copolymers
US8431198B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2008 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Nov 27, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/254
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A multilayer film comprises at least 3 layers including a first outer layer, a second outer layer and between the first and second outer layers at least one core layer. The first and second outer layers each comprise at least 75 weight percent of (a) at least one high impact polystyrene component. The core layer(s) comprises(s) (b) at least one styrene block copolymer that is present at a concentration of at least about 2 weight percent of the polymers in the film; and polymers (a), (b) and (c) at least one general purpose polystyrene having a Mw of more than 200,000 and 350,000 or less and that is present at a concentration of at least about 10 wt. % and up to at most about 50 wt. % of the polymers in the composition account for 100 percent by weight of the polymers in the polymer composition excluding polymeric additives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.