Patent · US Active

Optical film comprising birefringent naphthalate copolyester having branched or cyclic C4-C10 alkyl units

US8263731B2 · kind B2 · utility

20Cited by
25References
15Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJul 14, 2011
Grant dateSep 11, 2012
Priority date
Expiry dateJul 14, 2031

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T428/31786
  • WIPO fieldSurface technology, coating
  • WIPO sectorChemistry

Abstract

The present invention relates to multilayer optical films and birefringent copolyester films. The birefringent copolyester optical layer or birefringent copolyester film comprises a major amount of naphthalate units, ethylene units, and a minor amount of branched or cyclic C4 to C10 alkyl units. Also described are certain copolyester polymeric materials further comprising subunits of a phthalate ionomer such as dimethyl sulfosodium isophthalate ionomer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.