Dow Corning Corporation

University of Cambridge

Other

University of Florida Research Foundation Inc

Russell Keith King

Chi-long Lee

Kyuha Chung

Bianxiao Zhong

Shizhong Zhang

William Alden Crossland

Gary Michael Wieber

Terry Clapp

Jonathan Hannington

Anthony Bernard Davey

Huan Xu

Eric S Moyer

Kenneth Christopher Fey

Martin Grasmann

Terrence K Hilty

Eugene D Groenhof

Fumito Nishida

Tina Leaym

Leslie Earl Carpenter, Ii

Gregory Scott Becker

Omar Farooq

Glenn Frederick Viaplana Gordon

Tetsuyuki Michino

Randall Gene Schmidt

Michael A Lutz

Joo-Nyung Jang

Binh Thanh Nguyen

Gary T Burns

Kenneth Boone Wagener

Duane R Bujalski

Gerald Lawrence Witucki

Kai Su

Glenn Gordon

Lori Ann Stark-Kasley

Craig Rollin Yeakle

Harry J Coles

Katsuya Eguchi

Ronald Paul Boisvert

Mykhaylo Pivnenko

John Albaugh

Duan Li Ou

Pierre Maurice Chevalier

Steven Robson

Oliver Hadeler

Mikhael Pivnenko

John Benard Horstman

Krystyna Regina Brzezinska

The present, invention relates to liquid crystal compositions having a smectic A structure for use in an optical device in which the composition is sandwiched between a pair of electrodes (-). In essence the composition includes a siloxane oligomer (component (a)) which may be seen to construct a layered SmA system of particular spacing and 'strength'. Within this structure a low molar mass nematic mesogen (component (c)) is provided that may be considered to be that of a 'plasticiser' which moderates the layer &#x201c;strength&#x201d;, while simultaneously providing tuneability to the properties of the composition, e.g. its refractive index or dielectric anisotropy. The addition of a side chain liquid crystal polysiloxane (component (d)) allows such systems to be further moderated since they can be considered as binding together the la&#x3e;&#xbe;rs, both within a given layer and between layers. An ionic dopant (component (b)) is also included in the composition that migrates through the composition when low frequency electric fields are applied to the composition by the electrodes, thereby disrupting the order to the composition. Order in the composition can be restored by applying a higher frequency field that does not allow the dopant time to migrate significantly. Chromophores may also be included in the formulation.

Liquid crystal formulations and structures for smectic A optical devices

A liquid crystal formulation is described. The liquid crystal formulation comprises a first oligosiloxane-modified nano-phase segregating liquid crystalline material; and at least one additional material selected from a second oligosiloxane-modified nano-phase segregating liquid crystalline material, non-liquid crystalline oligosiloxane-modified materials, organic liquid crystalline materials, or organic non-liquid crystalline materials, wherein the liquid crystal formulation is nano-phase segregated in the SmC* phase, has an I&#x2192;SmC* phase transition, with a SmC* temperature range from about 15&#xb0; C. to about 35&#xb0; C., has a tilt angle of about 22.5&#xb0;&#xb1;6&#xb0; or about 45&#xb0;&#xb1;6&#xb0;, and has a spontaneous polarization of less than about 50 nC/cm2, and a rotational viscosity of less than about 600 cP. Devices containing liquid crystal formulations are also described. The device has a stable bookshelf geometry, bistable switching, and isothermal electric field alignment, a response time of less than 500 &#x3bc;s when switched between two stable states, and an electric drive field of less than about 30 V/&#x3bc;m.

Oligosiloxane modified liquid crystal formulations and devices using same

A liquid crystal electro-optic device. The liquid crystal electro-optic device comprises at least one liquid crystal cell comprising: a pair of substrates having a gap therebetween; a pair of electrodes, the pair of electrodes positioned on one of the substrates or one electrode positioned on each substrate; and a ferroelectric, oligosiloxane liquid crystal material disposed in the gap between the pair of substrates, the ferroelectric, oligosiloxane liquid crystal material exhibiting an I-&#x2666; SmC* phase sequence wherein the liquid crystal electro-optic device is bistable in operation. The invention also involves a method for making a liquid crystal electro-optic device.

Bistable ferroelectric liquid crystal devices

This invention relates to a coating composition comprising (A) 100 weight parts of a compound containing at least one acrylate group or a compound containing at least one isocyanate group; (B) at least one aminofanctional silicone resin; (C) up to 300 weight parts of at least one organic hardener; and (D) up to 5 weight parts of at least one cure rate modifier. The coating compositions of this invention are useful as a stand alone coating or as ingredients in flame retardant coating compositions, fabric or fiber coating compositions, UV resistant coating compositions, paint formulations, powder coatings, architectural coatings and adhesives. The coating compositions of this invention have enhanced thermal stability, particularly when used in coatings, paints, powder coatings, architectural coatings, and adhesives.

Coating compositions containing aminofunctional silicone resins

Traction fluids

Traction fluids suitable for operations under widely varying temperature environments, particularly having excellent low temperature properties are described. The tractions fluids comprise blends of organic oils and siloxane compositions. The siloxane compositions may include MTQ, MT, MQ, MDT, MDM, or D units in varying molar percents.

Tractions fluids having excellent low temperature properties

This invention pertains to a siloxane resin composition comprising R SiO siloxane units, R SiO siloxane units and (R O) SiO siloxane units wherein R is an alkyl group having 1 to 5 carbons, hydrogen, or mixtures thereof; R is a monovalent organic group having 6 to 30 carbons; R is a branched alkyl group having 3 to 30 carbons, b is from 1 to 3; and the siloxane resin contains from 2.5 to 85 mole percent R SiO units, 2.5 to 50 mole percent R SiO units and 5 to 95 mole percent (R O) SiO units. The siloxane resin is useful to make insoluble porous resin and insoluble porous coatings. Heating a substrate coated with the siloxane resin at a sufficient temperature effects removal of the R and R O groups to form an insoluble insoluble porous coating having a porosity of 1 to 60 volume percent and a dielectric constant in the range of 1.5 to 3.0.

Siloxane resins

Nanoporous silicone resins having low dielectric constants

A method for hydrolyzing chlorosilanes having at least three chlorine atoms bonded to each silicon atom to form silicone resins. The method comprises adding at least one of hydridotrichlorosilane, tetrachlorosilane, or organotrichlorosilane to a two-phase mixture comprising a non-polar organic solvent, an aqueous phase comprising 0 to about 43 weight percent hydrochloric acid, and a surface active compound selected from the group consisting of organosulfates described by formula R SO H and alkali metal salts thereof, where R is selected from the group consisting of alkyl groups comprising about 4 to 16 carbon atoms and alkylphenyl groups comprising 7 to about 22 carbon atoms.

Process for synthesis of silicone resin

Silicone resin compositions having good solution solubility and stability

Nanoporous silicone resins having low dielectric constants and method for preparation

A method for hydrolyzing chlorosilanes having at least three chlorine atoms bonded to each silicon atom to form silicone resins. The method comprises adding at least one of hydridotrichlorosilane, tetrachlorosilane, or organotrichlorosilane to a two-phase mixture comprising a non-polar organic solvent, an aqueous phase comprising 0 to about 43 weight percent hydrochloric acid, and a surface active compound selected from the group consisting of alkylsulphonic acid hydrate, alkali metal salt of alkylsulphonic acid, arysulphonic acid hydrate, and alkali metal salt of arylsulphonic acid.

Silicone resins and process for synthesis

Soluble silicone resin compositions having good solution stability

A method for preparing an .alpha.,.omega.-silyl terminated branched polyalkenylenes and polyolefins is provided. The method involves:

Synthesis of functional silyl terminated branched polyalkenylenes and

The invention pertains to an dual-cure silicone adhesive composition that is extrudable and flowable at room temperature in the absence of a solvent comprising (A) 40 to 95 parts of an alkenyl functional siloxane resin said resin containing 0.01 to 22 wt% alkenyl functionality; (B) 0.5 to 20 parts of a SiH containing polyorganosiloxane having an average of at least 1.7 silicon-bonded hydrogen atoms per molecule and having a viscosity of 0.8 to 2,000 mm.sup.2 /s; (C) a silane represented by monomers of the formula R.sup.1.sub.4-y Si(OR.sup.2).sub.y or oligomeric reaction products thereof; (D) a hydrosilylation catalyst in sufficient quantity to promote curing of said composition; (E) a moisture curing catalyst to promote the moisture initiated reaction of the alkoxy radicals; (F) optionally, 0.1 to 70 parts of a polydiorganosiloxane having at least two ethylenically or acetylenicaly unsaturated groups per molecule and having a viscosity of 100 to 80,000 mm.sup.2 /s; and (G) optionally, an inhibitor in sufficient quantity for the composition to be stable at room temperature; wherein at least one of said resin (A), SiH containing polyorganosiloxane (B) and/or optional polydiorganosiloxane (F) contain a curing radical of the formula --ZSiR.sup.1.sub.x (OR.sup.2).sub.3-x.

Dual-cure flowable adhesive

Growing community of inventors

Midland, MI, United States of America

Russell Keith King