US4994198A
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US
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Electrorheological fluids based on silicone ionomer particles
Assignee: Dow Silicones Corp
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Filing: 1990-01-29
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Granted: 1991-02-19
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Expires: 2010-01-29
Abstract
Abstract This invention relates to an electrorheological (ER) fluid composition comprising a suspension of a solid silicone ionomer in an electrically non-conducting liquid wherein the silicone ionomer is a reaction product of (I) an amine functional diorganopolysiloxane having a degree of polymerization of less than about 10,000 in which at least about 3 mole percent of the silicon atoms have attached thereto, through silicon-carbon bonds, an amine functional organic group bearing at least one --NHR" group, in which R" is selected from the group consisting of hydrogen and an alkyl radical having 1 to 6 carbon atoms; and (II) an acid.
Inventors
- 👤 Kyuha Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:56
CPC Classifications
C; C10; C10M; C10M171/00; C10M171/001; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08G77/26; C08G77/70
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
121 words
In an electrorheological fluid comprising a dispersion of a plurality of solid particles in an electrically non-conducting liquid, the improvement comprising using as said solid particles a silicone ionomer reaction product of (I) an amine functional diorganopolysiloxane having a degree of polymerization of less than about 10,000 wherein at least about 3 mole percent of the silicon atoms have attached thereto, through silicon-carbon bonds, an amine functional organic group bearing at least one -NHR" group, in which R" is selected from the group consisting of hydrogen and an alkyl radical having 1 to 6 carbon atoms; and (II) an acid the quantity of said acid being at least sufficient to impart a solid character to said silicone ionomer at 25° C.
Claim 2
Dependent Claim
121 words
In an electrorheological fluid comprising a dispersion of a plurality of solid particles in an electrically non-conducting liquid, the improvement comprising using as said solid particles a silicone ionomer reaction product of (I) an amine functional diorganopolysiloxane having a degree of polymerization of less than about 10,000 wherein at least about 3 mole percent of the silicon atoms have attached thereto, through silicon-carbon bonds, an amine functional organic group bearing at least one -NHR" group, in which R" is selected from the group consisting of hydrogen and an alkyl radical having 1 to 6 carbon atoms; and (II) an acid the quantity of said acid being at least sufficient to impart a solid character to said silicone ionomer at 25° C.
Claim 3
Dependent Claim
23 words
The composition according to claim 1, wherein said acid (II) is selected from the group consisting of phosphoric, hydrochloric, nitric and sulfuric acid.
Claim 4
Dependent Claim
27 words
The composition according to claim 2, wherein the organic groups of said amine functional diorganopolysiloxane (I) are all methyl radicals and said acid (II) is sulfuric acid.
Claim 5
Dependent Claim
110 words
A composition comprising a homogeneous dispersion of (A) a silicone ionomer reaction product of (I) an amine functional diorganopolysiloxane fluid having a degree of polymerization of less than about 10,000 wherein at least about 3 mole percent of the silicon atoms have attached thereto, through silicon-carbon bonds, an amine functional organic group bearing at least one -NHR" group, in which R" is selected from the group consisting of hydrogen and an alkyl radical having 1 to 6 carbon atoms; and (II) an acid, the quantity of said acid being at least sufficient to impart a solid character to said silicone ionomer at 25° C., in (B) an electrically non-conducting liquid.
Claim 6
Dependent Claim
110 words
A composition comprising a homogeneous dispersion of (A) a silicone ionomer reaction product of (I) an amine functional diorganopolysiloxane fluid having a degree of polymerization of less than about 10,000 wherein at least about 3 mole percent of the silicon atoms have attached thereto, through silicon-carbon bonds, an amine functional organic group bearing at least one -NHR" group, in which R" is selected from the group consisting of hydrogen and an alkyl radical having 1 to 6 carbon atoms; and (II) an acid, the quantity of said acid being at least sufficient to impart a solid character to said silicone ionomer at 25° C., in (B) an electrically non-conducting liquid.
Claim 7
Dependent Claim
136 words
The composition according to claim 4, wherein said amine functional diorganopolysiloxane fluid (I) has the average general formula ##STR18## wherein R is independently selected from the group consisting of alkyl, cycloalkyl, haloalkyl, aromatic and haloaromatic radicals and Q is independently selected from the group consisting of said R and an amine functional group having an average structure selected from the group consisting of --R'(NHCH 2 CH 2 ) g NR"H and --R'NR"H, in which R" has its previously defined meaning, R' is a divalent hydrocarbon group having from 3 to 6 carbon atoms and g is an integer between 1 and 4, inclusive and wherein y is selected so as to provide a total degree of polymerization of said diorganopolysiloxane fluid of less than about 10,000 and a molar content of Q of at least 3%.
Claim 8
Dependent Claim
27 words
The composition of claim 5, wherein R of said amine functional diorganopolysiloxane fluid (I) is independently selected from the group consisting of methyl, phenyl and 3,3,3-trifluoropropyl radicals.
Claim 9
Dependent Claim
19 words
The composition of claim 6, wherein said Q group is selected from the group consisting of the structures ##STR19##
Claim 10
Dependent Claim
23 words
The composition according to claim 7, wherein said acid (II) is selected from the group consisting of phosphoric, hydrochloric, nitric and sulfuric acid.
Claim 11
Dependent Claim
66 words
The composition according to claim 8, wherein said amine functional diorganopolysiloxane fluid (I) has the average structure ##STR20## wherein Me denotes a methyl radical and the values of x and y are selected such that the total degree of polymerization of said fluid (I) is less than about 400 and the molar content of Q' is 10% to 70%, in which Q' is the group ##STR21##
Claim 12
Dependent Claim
25 words
The composition according to claim 9, wherein the molar ratio of said Q' group to said acid (II) employed in said reaction is about 1:1.
Claim 13
Dependent Claim
24 words
The composition according to claim 10, wherein said silicone ionomer (A) comprise from about 5 to about 40 percent by weight of the composition.
Claim 14
Dependent Claim
23 words
The composition according to claim 6, wherein said acid (II) is sulfuric acid and said electrically non-conducting fluid (B) is a silicone oil.
Claim 15
Dependent Claim
23 words
The composition according to claim 7, wherein said acid (II) is sulfuric acid and said electrically non-conducting fluid (B) is a silicone oil.
Claim 16
Dependent Claim
23 words
The composition according to claim 8, wherein said acid (II) is sulfuric acid and said electrically non-conducting fluid (B) is a polydimethylsiloxane oil.
Claim 17
Dependent Claim
23 words
The composition according to claim 9, wherein said acid (II) is sulfuric acid and said electrically non-conducting fluid (B) is a polydimethylsiloxane oil.
Claim 18
Dependent Claim
23 words
The composition according to claim 10, wherein said acid (II) is sulfuric acid and said electrically non-conducting fluid (B) is a polydimethylsiloxane oil.
Claim 19
Dependent Claim
23 words
The composition according to claim 11, wherein said acid (II) is sulfuric acid and said electrically non-conducting fluid (B) is a polydimethylsiloxane oil.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |