Patent · US Active

Poly(aryletherimides) for negative birefringent films for LCDs

US7820253B2 · kind B2 · utility

1Cited by

9References

16Claims

0Family size

Assignee

Akron Polymer Systems, Inc. · US

Inventors

Frank W. Harris · Akron, US
Limin Sun · Copley, US
Dong Zhang · Uniontown, US
Stephen Z. D. Cheng · Akron, US

Key dates

Filing date	Oct 4, 2007
Grant date	Oct 26, 2010
Priority date	—
Expiry date	Sep 28, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31721
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A negative birefringence film prepared from a poly(aryletherimide) which is the reaction product of a dianhydride and a diamine, where the dianhydride is 4,4′-[4,4′-(p-phenyleneoxy)isopropylidene]bis(phthalic anhydride) (BisADA), bis(3,4-dicarboxyphenyl)ether dianhydride (ODPA), 4,4′-bis(3,4-dicarboxyphenoxy)biphenyl dianhydride (BPEDA), 1,4-bis(3,4-dicarboxyphenyloxy)phenyl dianhydride (BPQDA), 3,3′,4,4′-tetracarboxylicbiphenyl dianhydride (BPDA), or 2,2-bis(3,4-dicarboxyphenyl)-1,1,1,3,3,3-hexafluoropropane dianhydride (6FDA), alone or a mixture with one or more of:

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