Patent USRE32889E successfully refreshed from Google Patents.
USRE32889E
Expired / Lapsed
US
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Thixotropic cyanoacrylate compositions
Assignee: Henkel Loctite Corp
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Filing: 1986-10-14
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Granted: 1989-03-14
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Expires: 2006-10-14
Abstract
Abstract Cyanoacrylate compositions which employ fumed silicas treated with polydimethylsiloxane or trialkoxyalkylsilane are stable and exhibit an unexpectedly high thixotropic ratio. Such compositions are useful in adhesive applications or, when stabilized so as to prevent polymerizaton in contact with moisture, in latent fingerprint developing applications.
Inventors
- 👤 Alan E. Litke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:47
CPC Classifications
C; C09; C09J; C09J4/00; C09J4/06; C08; C08F; C08F291/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
62 words
In a composition comprising an α-cyanoacrylate ester monomer and a thixotropic agent, the improvement comprising that said composition is a non-flowable gel, said thixotropic agent is present in an amount of 12% or less and is a fumed silica having a surface treated with a trialkoxyalkylsilane and the said composition has a 2.5 RPM Brookfield viscosity of about 1×10 5 or greater.
Claim 2
Dependent Claim
62 words
In a composition comprising an α-cyanoacrylate ester monomer and a thixotropic agent, the improvement comprising that said composition is a non-flowable gel, said thixotropic agent is present in an amount of 12% or less and is a fumed silica having a surface treated with a trialkoxyalkylsilane and the said composition has a 2.5 RPM Brookfield viscosity of about 1×10 5 or greater.
Claim 3
Dependent Claim
14 words
A composition as in claim 1 wherein the silica surface is treated with trimethoxyoctysilane.
Claim 4
Dependent Claim
14 words
A composition as in claim 1 comprising an organic polymer dissolved in said monomer.
Claim 5
Dependent Claim
21 words
A composition as in claim 3 wherein said polymer is selected from polyvinyl acetate polymers and copolymers, polyacrylates, polymethacrylates and polycyanoacrylates.
Claim 6
Dependent Claim
16 words
A composition as in claim 1 stabilized so as to be nonpolymerizable on contact with moisture.
Claim 7
Dependent Claim
20 words
A composition as in claim 3 wherein said polymer is present at levels of between 1 and 15% by weight.
Claim 8
Dependent Claim
20 words
A composition as in claim 6 wherein said polymer is present at levels of between 3 and 10% by weight.
Claim 9
Dependent Claim
11 words
A composition as in claim 7 wherein said polymer is polymethylmethacrylate.
Claim 10
Dependent Claim
21 words
A composition as in claim 1 wherein said silica is present in an amount between about 4 and 8% by weight.
Claim 11
Dependent Claim
20 words
A composition as in claim 9 wherein said silica is present in an amount of about 6% by weight. .Iadd.
Claim 12
Dependent Claim
186 words
A composition as in claim 1 wherein the composition viscosity is about 1×10 5 . .Iaddend. .Iadd.12. A composition comprising: an α-cyanoacrylate ester monomer; between 1 and 15% of a polymeric thickener; and an amount less than 12% by weight of the composition of a trimethoxyoctylsilane treated fumed silica effective to form a thixotropic gel. .Iaddend. .Iadd.13. A composition comprising: an α-cyanoacrylate ester monomer; between 1 and 15% of a polymeric thickener; and an amount in the range of about 4%-8% by weight of the composition of a trimethoxyoctylsilane treated silica, said amount of silica effective to form a thixotropic gel. .Iaddend. .Iadd.14. A composition comprising: an α-cyanoacrylate ester monomer; between 1 and 15% of a polymeric thickener; and a trimethoxyoctylsilane treated silica having a surface area of about 150 m 2 /gm in an amount, less than 12% by weight of the composition, effective to form a thixotropic gel. .Iaddend. .Iadd.15. A composition as in claim 12 wherein the polymeric thickener is polymethylmethacrylate. .Iaddend. .Iadd.16. A composition as in claim 13 wherein said polymeric thickener is polymethylmethacrylate and is present in the range of about
Claim 13
Dependent Claim
67 words
3%-10%. .Iaddend. .Iadd.17. A composition as in claim 16 wherein the monomer is methyl or ethyl cyanoacrylate. .Iaddend. .Iadd.18. A composition consisting essentially of: methyl or ethyl cyanoacrylate; between 1 and 15% by weight of the composition of polymethylmethacrylate; and about 4-8% by weight of the composition of a trimethoxyoctylsilane treated silica. .Iaddend. .Iadd.19. A composition as in claim 18 which also includes a polymerization stabilizer. .Iaddend.
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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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |