Electroviscous fluid comprising a base neutralized carboxyaryl group-containing organopolysiloxane polyelectrolyte
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsAkihiko Koboyashi, Takashi Nakamura
Life of this patent
Estimating the term…
Abstract
This invention pertains to electroviscous fluids comprising a dispersion in an electrical insulating fluid of microparticles that are comprised of a polyelectrolyte or a mixture of a polyether and a polyelectrolyte wherein said polyelectrolyte consists of a carboxyaryl group-containing organopolysiloxane that has been neutralized by a base containing a monovalent or divalent metal. The electroviscous fluids of this invention provide a high electroviscous effect and good dispersion stability, and they are thermally stable and do not abrade surrounding equipment.
Claims11
An electroviscous fluid comprising a 0.1 to 50 weight percent dispersion in an electrical insulating fluid of microparticles that are comprised of a polyelectrolyte wherein said polyelectrolyte is comprised of a carboxyaryl group-containing organopolysiloxane that has been neutralized by a base containing a monovalent or a divalent metal wherein the carboxyaryl group-containing organopolysiloxanes are selected from the group consisting of organopolysiloxanes having the formulae:
- ##STR8## wherein R.sup.1 is an alkyl group, R.sup.2 is an alkylene group, O is selected from the group consisting of ##STR9## m is 0 or a positive integer and n is a positive integer.
An electroviscous fluid comprising a 0.1 to 50 weight percent dispersion in an electrical insulating fluid of microparticles that are comprised of a mixture of a polyether and a polyelectrolyte wherein said polyelectrolyte is comprised of a carboxyaryl group-containing organopolysiloxane that has been neutralized by a base containing a monovalent or a divalent metal wherein the carboxyaryl group-containing organopolysiloxanes are selected from the group consisting of organopolysiloxanes having the formulae:
- ##STR11## wherein R.sup.1 is an alkyl group, R.sup.2 is an alkylene group, Q is selected from the group consisting of ##STR12## m is 0 or a positive integer and n is a positive integer.
Dependencies are inferred from the claim text.