Film having good tear property on impact comprising polypropylene and an ethylene polymer
US3952073A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1973 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Jun 11, 1993 |
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: EQU 1. Ny - Nx = 6 .times. 10.sup.-.sup.3 .about. 25 .times. 10.sup.-.sup.3 Wherein Nx is the refractive index in the machine direction and Ny is the refractive index in the transverse direction; EQU 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; PA1 3. break elongation in the machine direction = 150 .about. 800 %; and PA1 4. no substantial necking is seen on the surface thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.