Shrink film and method of making the same
US6255388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Feb 22, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/73
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A shrink film is provided which is superior in glossiness, mechanical strength, and rigidity, and which is also provided with a property of preventing natural shrinkage. The shrink film with excellent properties is produced by using a resin composition which is obtained by graft polymerization of copolymers of styrene and butadiene with styrene, methylmethacrylate, and butylacrylate. The thus obtained resin composition is extruded after melting and kneading, and drawn into a film in two directions, and exposed at a temperature within a temperature range for the thermal setting so as to obtain the orientation according to ASTM D1504 of the shrink film in range of 1.5 to 5.0 MPa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.