Cynthia L Mcgowan

US Patent:

51320410, Jul 21, 1992

Filed:

Jun 23, 1987

Appl. No.:

7/061072

Inventors:

William J. Cumming - Chelmsford MA
Russell A. Gaudiana - Merimack NH
Cynthia McGowan - Stoneham MA
Richard A. Minns - Arlington MA
Alaric Naiman - Cambridge MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

C09K 1912
C09K 1922
C09K 1920

US Classification:

25229965

Abstract:

Disclosed are smetic liquid crystal compounds exhibiting ferroelectric behavior and having the formula R. sup. 1 --OR. sup. 2). sub. a O--R. sup. 3). sub. b Z--R* wherein R. sup. 1 is alkyl or alkoxyalkyl, R. sup. 2 and R. sup. 3 are each alkylene, a is an integer of at least one, b is zero or one, R* is an optically active group containing an asymmetric center and --Z-- is an organic divalent core radical having parallel or coaxially extending bonds at the terminal ends thereof, the core radical having an axial ratio of at least two and being characterized by an essentially rigid and flat molecular structure. Presence of the ether-interrupted hydrocarbon tail moiety at the terminal end of the compounds provides a lowering in observed temperatures of phase transition.

US Patent:

45978913, Jul 1, 1986

Filed:

Jun 4, 1984

Appl. No.:

6/616975

Inventors:

Howard G. Rogers - Weston MA
Russell A. Gaudiana - Merrimack NH
Cynthia B. McGowan - Stoneham MA
Kenneth S. Norland - Lexington MA
Ronald J. Sahatjian - Lexington MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

C02F 113
C09K 334
C07C40300

US Classification:

2522991

Abstract:

There are described novel perylene dyes which have at least one, and preferably two, substituted twisted biphenylene radicals. The substituted biphenylene radicals include substituents which confer a non-coplanar molecular configuration about the long axis of the dye molecule. The dyes are soluble in various liquid crystal materials and exhibit a high order parameter in solutions of liquid crystal material. Also disclosed are liquid crystal compositions and liquid crystal devices.