Film of good tear property on impact
US4045515A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1976 |
| Grant date | Aug 30, 1977 |
| Priority date | — |
| Expiry date | Jan 8, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A film of excellent cutting property in the transverse direction which comprises a mixture of polypropylene and at least one ethylene polymer and satisfying the following requirements: 1. Ny - Nx = 6 .times. 10.sup.-3 .about. 25 .times. 10.sup.-3 : Wherein Nx in the refractive index in the machine direction and Ny is the refractive index in the transverse direction; 2. (Nx + Ny) .times. 0.5 - Nz .ltoreq. 0.012: Wherein Nz is the refractive index in the vertical direction and Nx and Ny are each as defined above; 3. break elongation in the machine direction = 150 .about. 800%; and 4. no substantial necking is seen on the surface thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.