Uniaxially shrinkable, biaxially oriented polypropylene films
US8551587B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2012 |
| Grant date | Oct 8, 2013 |
| Priority date | — |
| Expiry date | Sep 27, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Provided is a polypropylene film, and a method of making the film, the film comprising at least one core layer sandwiched between at least two skin layers, the layers comprising a core layer comprising polypropylene and within the range of from 20 wt % to 50 wt %, by weight of the materials in the core layer, of a propylene-α-olefin elastomer having within the range of from 5 wt % to 25 wt % α-olefin derived units, by weight of the copolymer; and skin layers comprising one or more polymers having a melting point within the range of from 125° C. to 160° C., a Shore D Hardness within the range of from 55 to 70, and a Flexural Modulus of at least 600 MPa; wherein the film has a Haze value of less than 10%, the film being biaxially oriented but shrinkable substantially only in the MD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.