Propylene-based blown films with improved performance, stability and elastic properties compared to polyethylene films
US8067501B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2009 |
| Grant date | Nov 29, 2011 |
| Priority date | — |
| Expiry date | Feb 17, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A thermoplastic composition for cast and blown films and the resulting films thereof are provided. The film can include about 10 wt % to 80 wt % propylene-based copolymer having at least 50 wt % propylene-derived units and 5 wt % to 30 wt % alpha-olefin comonomer, based on the total weight of the polymer that exhibits a melting point of about 100° C. to 170° C., and a MFR of about 200 dg/min or less. The film can include about 20 wt % to 90 wt % polypropylene homopolymer having a melting point of about 140° C. to 190° C. The film can have a thickness of about 10 μm to 100 μm, a haze of 13% or less, a 1% MD Secant tensile modulus of 55,000 to 150,000 psi, a machine direction Elmendorf tear of at least 5 g/mil and a transverse direction Elemdorf tear of at least 300 g/mil, and a 45 degree gloss of at least 70.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.