Opaque polymeric films cavitated with syndiotactic polystyrene
US6528155B1 · kind B1 · utility
3Cited by
14References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 9, 2000 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Feb 9, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31913
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing an opaque polymeric film comprises:(a) extruding a base layer comprising a polymeric matrix and at least one cavitating agent;(b) coextruding at least one additional layer on at least one side of the base layer;(c) cooling the coextruded multi-layer film; and then(d) orienting the film in at least the machine direction (MD);wherein at least said base layer contains a syndiotactic polystyrene polymer, and wherein said syndiotactic polystyrene polymer is in the form of solid, non-hollow particles during the orienting step (d).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.