Patent US4597801A successfully refreshed from Google Patents.
US4597801A
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Silane dispersing agent for magnetic media
Assignee: General Electric Co
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Filing: 1985-06-04
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Granted: 1986-07-01
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Expires: 2005-06-04
Abstract
Abstract Ferromagnetic particles are dispersed for use in magnetic coatings by a novel dispersing agent containing either silylated alkylene oxide copolyethers or isocyanatoalkyl silanes in combination with phosphate esters.
Inventors
- 👤 Julius J. Stratta
- 👤 Nicholas Stasiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:14
CPC Classifications
C; C09; C09K; C09K23/00; C09K23/54; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/7013; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C08G65/327; C08G65/329; C08G65/336; C08L; C08L71/00; C08L71/02; C09K23/017; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
411 words
A dispersing agent comprising (a) a silane selected from the group consisting essentially of a silylated copolyether of the general formula: ##STR11## where R 1 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy alkyl group having from 2 to 12 carbon atoms, or an acyl group having from 6 to 12 carbon atoms; R 2 is individually a hydrogen atom, an alkyl group having from 1 to 18 carbon atoms or an aryl group having from 6 to 18 carbon atoms; R 3 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an aryl group having from 6 to 18 carbon atoms or an aryl alkyl group having from 7 to 18 carbon atoms; R 4 is individually an alkyl group having 1 to 4 carbon atoms; the sum of x+y has a value of from 2 to 100; z has a value of 1, 2 or 3; w has a value 0 to 6; m has a value of 1, 2 or 3; and a has a value of 0 or 1; and an isocyanato silane of the general formula: ##STR12## where R 6 is individually an alkyl group having 1 to 4 carbon atoms; R 7 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy alkyl group having from 2 to 12 carbon atoms or an acyl group having from 6 to 12 carbon atoms; b is 0, 1, 2 or 3; and R 5 is an alkylene, arylene or aralkylene group having from 1 to 18 carbon atoms or a group of the formula: ##STR13## and (b) a phosphate ester of the general formula: ##STR14## where R 8 is a hydrogen atom or an alkyl group containing from 1 to 20 carbon atoms; R 9 is a hydrogen atom, an alkyl group containing from 1 to 4 carbon atoms, an aryl group containing from 6 to 18 carbon atoms; or an alkylaryl group containing from 7 to 17 carbon atoms; the sum of c+d has a value of from 0 to 100; e has a value of 1 or 2; and A is a hydrogen, sodium, potassium or lithium atom or an NH 4 group; where the ratio of silane to phosphate ester is 10:90 to 99:1 when the silane is a silylated copolyether and 35:65 to 99:1 when the silane is an isocyanato silane.
Claim 2
Dependent Claim
411 words
A dispersing agent comprising (a) a silane selected from the group consisting essentially of a silylated copolyether of the general formula: ##STR11## where R 1 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy alkyl group having from 2 to 12 carbon atoms, or an acyl group having from 6 to 12 carbon atoms; R 2 is individually a hydrogen atom, an alkyl group having from 1 to 18 carbon atoms or an aryl group having from 6 to 18 carbon atoms; R 3 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an aryl group having from 6 to 18 carbon atoms or an aryl alkyl group having from 7 to 18 carbon atoms; R 4 is individually an alkyl group having 1 to 4 carbon atoms; the sum of x+y has a value of from 2 to 100; z has a value of 1, 2 or 3; w has a value 0 to 6; m has a value of 1, 2 or 3; and a has a value of 0 or 1; and an isocyanato silane of the general formula: ##STR12## where R 6 is individually an alkyl group having 1 to 4 carbon atoms; R 7 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy alkyl group having from 2 to 12 carbon atoms or an acyl group having from 6 to 12 carbon atoms; b is 0, 1, 2 or 3; and R 5 is an alkylene, arylene or aralkylene group having from 1 to 18 carbon atoms or a group of the formula: ##STR13## and (b) a phosphate ester of the general formula: ##STR14## where R 8 is a hydrogen atom or an alkyl group containing from 1 to 20 carbon atoms; R 9 is a hydrogen atom, an alkyl group containing from 1 to 4 carbon atoms, an aryl group containing from 6 to 18 carbon atoms; or an alkylaryl group containing from 7 to 17 carbon atoms; the sum of c+d has a value of from 0 to 100; e has a value of 1 or 2; and A is a hydrogen, sodium, potassium or lithium atom or an NH 4 group; where the ratio of silane to phosphate ester is 10:90 to 99:1 when the silane is a silylated copolyether and 35:65 to 99:1 when the silane is an isocyanato silane.
Claim 3
Dependent Claim
34 words
The dispersing agent of claim 1 wherein the ratio of silane to phosphate ester is 25:75 to 75:25 when the silylated copolyether is employed and 50:50 to 90:10 when the isocyanato silane is employed.
Claim 4
Dependent Claim
36 words
The dispersing agent of claim 1 wherein the silane is a silylated copolyether where R 1 and R 3 are alkyl groups, R 2 is hydrogen, z is 1, w is 3 and a is 0.
Claim 5
Dependent Claim
30 words
The dispersing agent of claim 1 wherein the silane is an isocyanato silane where R 7 is an alkyl group, b is 0 and R 5 is an alkylene group.
Claim 6
Dependent Claim
20 words
The dispersing agent of claim 3 wherein the silane is: CH.sub.3 O(C.sub.3 H.sub.6 O).sub.27 (C.sub.2 H.sub.4 O).sub.24 C.sub.3 H.sub.6 Si(OCH.sub.3).sub.3.
Claim 7
Dependent Claim
16 words
The dispersing agent of claim 3 wherein the silane is: CH.sub.3 O(C.sub.2 H.sub.4 O).sub.12 (CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3.
Claim 8
Dependent Claim
17 words
The dispersing agent of claim 3 wherein the silane is: C.sub.4 H.sub.9 O(C.sub.3 H.sub.6 O).sub.5 (CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3.
Claim 9
Dependent Claim
17 words
The dispersing agent of claim 3 wherein the silane is: CH.sub.3 O(C.sub.2 H.sub.4 O).sub.75 --C.sub.3 H.sub.6 --Si(OCH.sub.3).sub.3.
Claim 10
Dependent Claim
11 words
The dispersing agent of claim 4 wherein the silane is isocyanatotriethoxysilane.
Claim 11
Dependent Claim
380 words
A process of dispersing ferromagnetic particles which comprises the use of a dispersing agent comprising (a) a silane selected from the group of silanes consisting essentially of silylated copolyethers of the formula: ##STR15## where R 1 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy alkyl group having from 2 to 12 carbon atoms, or an acyl group having from 6 to 12 carbon atoms; R 2 is individually a hydrogen atom, an alkyl group having from 1 to 18 carbon atoms or an aryl group having from 6 to 18 carbon atoms; R 3 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an aryl group having from 6 to 18 carbon atoms or an aryl alkyl group having from 7 to 18 carbon atoms; R 4 is individually an alkyl group having 1 to 4 carbon atoms; the sum of x+y has a value of 1, 2 or 3; w has a value 0 to 6; m has a value of 1, 2 or 3; and a has a value of 0 or 1; and isocyanato silanes of the formula: ##STR16## where R 6 is individually an alkyl group having 1 to 4 carbon atoms; R 7 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy alkyl group having from 2 to 12 carbon atoms or an acyl group having from 6 to 12 carbon atoms; b is 0, 1, 2 or 3; and R 5 is an alkylene, arylene or aralkylene group having from 1 to 18 carbon atoms or a group of the formula: ##STR17## and (b) a phosphate ester of the formula: ##STR18## where R 8 is a hydrogen atom or an alkyl group containing from 1 to 20 carbon atoms; R 9 is a hydrogen atom, an alkyl group containing from 1 to 4 carbon atoms, an aryl group containing from 6 to 18 carbon atoms; or an alkylaryl group containing from 7 to 17 carbon atoms; the sum of c+d has a value of from 0 to 100; e has a value of 1 or 2; and A is a hydrogen, sodium, potassium or lithium atom or an NH 4 group.
Claim 12
Dependent Claim
380 words
A process of dispersing ferromagnetic particles which comprises the use of a dispersing agent comprising (a) a silane selected from the group of silanes consisting essentially of silylated copolyethers of the formula: ##STR15## where R 1 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy alkyl group having from 2 to 12 carbon atoms, or an acyl group having from 6 to 12 carbon atoms; R 2 is individually a hydrogen atom, an alkyl group having from 1 to 18 carbon atoms or an aryl group having from 6 to 18 carbon atoms; R 3 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an aryl group having from 6 to 18 carbon atoms or an aryl alkyl group having from 7 to 18 carbon atoms; R 4 is individually an alkyl group having 1 to 4 carbon atoms; the sum of x+y has a value of 1, 2 or 3; w has a value 0 to 6; m has a value of 1, 2 or 3; and a has a value of 0 or 1; and isocyanato silanes of the formula: ##STR16## where R 6 is individually an alkyl group having 1 to 4 carbon atoms; R 7 is individually a hydrogen atom, an alkyl group having from 1 to 12 carbon atoms, an alkoxy alkyl group having from 2 to 12 carbon atoms or an acyl group having from 6 to 12 carbon atoms; b is 0, 1, 2 or 3; and R 5 is an alkylene, arylene or aralkylene group having from 1 to 18 carbon atoms or a group of the formula: ##STR17## and (b) a phosphate ester of the formula: ##STR18## where R 8 is a hydrogen atom or an alkyl group containing from 1 to 20 carbon atoms; R 9 is a hydrogen atom, an alkyl group containing from 1 to 4 carbon atoms, an aryl group containing from 6 to 18 carbon atoms; or an alkylaryl group containing from 7 to 17 carbon atoms; the sum of c+d has a value of from 0 to 100; e has a value of 1 or 2; and A is a hydrogen, sodium, potassium or lithium atom or an NH 4 group.
Claim 13
Dependent Claim
34 words
The dispersing agent of claim 10 wherein the ratio of silane to phosphate ester is 25:75 to 75:25 when the silylated copolyether is employed and 50:50 to 90:10 when the isocyanato silane is employed.
Claim 14
Dependent Claim
36 words
The dispersing agent of claim 10 wherein the silane is a silylated copolyether where R 1 and R 3 are alkyl groups, R 2 is hydrogen, z is 1, w is 3 and a is 0.
Claim 15
Dependent Claim
30 words
The dispersing agent of claim 10 wherein the silane is an isocyanato silane where R 7 is an alkyl group, b is 0 and R 5 is an alkylene group.
Claim 16
Dependent Claim
20 words
The dispersing agent of claim 12 wherein the silane is: CH.sub.3 O(C.sub.3 H.sub.6 O).sub.27 (C.sub.2 H.sub.4 O).sub.24 C.sub.3 H.sub.6 Si(OCH.sub.3).sub.3.
Claim 17
Dependent Claim
16 words
The dispersing agent of claim 12 wherein the silane is: CH.sub.3 O(C.sub.2 H.sub.4 O).sub.12 (CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3.
Claim 18
Dependent Claim
17 words
The dispersing agent of claim 12 wherein the silane is: C.sub.4 H.sub.9 O(C.sub.3 H.sub.6 O).sub.5 (CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3.
Claim 19
Dependent Claim
17 words
The dispersing agent of claim 12 wherein the silane is: CH.sub.3 O(C.sub.2 H.sub.4 O).sub.75 --C.sub.3 H.sub.6 --Si(OCH.sub.3).sub.3.
Claim 20
Dependent Claim
11 words
The dispersing agent of claim 13 wherein the silane is isocyanatotriethoxysilane.
Claim 21
Dependent Claim
31 words
The dispersing agent of claim 1 wherein the phosphate ester is ##STR19## wherein n is 1 in about 50 mole percent of the ester and n is 2 in the remainder.
Claim 22
Dependent Claim
31 words
The dispersing agent of claim 1 wherein the phosphate ester is ##STR20## wherein n is 1 in about 50 mole percent of the ester and n is 2 in the remainder.
Claim 23
Dependent Claim
31 words
The dispersing agent of claim 10 wherein the phosphate ester is ##STR21## wherein n is 1 in about 50 mole percent of the ester and n is 2 in the remainder.
Claim 24
Dependent Claim
31 words
The dispersing agent of claim 10 wherein the phosphate ester is ##STR22## wherein n is 1 in about 50 mole percent of the ester and n is 2 in the remainder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |