Patent US4533422A successfully refreshed from Google Patents.
US4533422A
Expired / Lapsed
US
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Thixotropic cyanoacrylate compositions
Assignee: Henkel Loctite Corp
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Filing: 1984-08-13
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Granted: 1985-08-06
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Expires: 2004-08-13
Abstract
Abstract Cyanoacrylate compositions which employ fumed silicas treated with polydimethylsiloxane or trialkoxyalkyl silane are stable and exhibit an unexpectedly high thixotropic ratio. Such compositions are useful in adhesive applications or, when stabilized so as to prevent polymerization 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 17:33
CPC Classifications
C; C09; C09J; C09J4/00; C09J4/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
In a composition comprising an α-cyanoacrylate ester monomer and a thixotropic agent, the improvement comprising that said thixotropic agent is a fumed silica having a surface treated with a polydimethylsiloxane and is present in an amount of between about 0.5 and 12%.
Claim 2
Dependent Claim
42 words
In a composition comprising an α-cyanoacrylate ester monomer and a thixotropic agent, the improvement comprising that said thixotropic agent is a fumed silica having a surface treated with a polydimethylsiloxane and is present in an amount of between about 0.5 and 12%.
Claim 3
Dependent Claim
14 words
A composition as in claim 1 comprising an organic polymer dissolved in said monomer.
Claim 4
Dependent Claim
19 words
A composition as in claim 2 wherein said polymer is selected from polyvinyl acetate polymers, polyacrylates, polymethacrylates and polycyanoacrylates.
Claim 5
Dependent Claim
29 words
A composition as in claim 1 having the consistency of a nonflowable gel, which will not move when extruded onto a vertical glass plate as a 1/8" diameter bead.
Claim 6
Dependent Claim
20 words
A composition as in claim 2 wherein said polymer is present at levels of between 1 and 15% by weight.
Claim 7
Dependent Claim
19 words
A composition as in claim 5 wherein said polymer is present at levels between 3 and 10% by weight.
Claim 8
Dependent Claim
11 words
A composition as in claim 6 wherein said polymer is polymethylmethacrylate.
Claim 9
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 10
Dependent Claim
19 words
A composition as in claim 8 wherein said silica is present in an amount of about 6% by weight.
Claim 11
Dependent Claim
45 words
A composition as in claim 1 wherein the α-cyanoacrylate monomer is a compound of the formula: ##STR2## where R 1 is C 1-12 alkyl, C 1-12 alkyl substituted with a halogen atom or an alkoxy group, C 2-12 alkenyl, C 2-12 alkynyl, aralkyl or aryl.
Claim 12
Dependent Claim
35 words
A composition as in claim 10 wherein R 1 is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, pentyl, hexyl, allyl, methallyl, crotyl, propargyl, cyclohexyl, benzyl, phenyl, cresyl, 2-chloroethyl, 3-chloropropyl, 2-chlorobutyl, trifluoroethyl, 2-methoxyethyl and 2-ethoxyethyl.
Claim 13
Dependent Claim
14 words
A composition as in claim 11 wherein R 1 is methyl, ethyl or 2-methoxyethyl.
Claim 14
Dependent Claim
34 words
A method of bonding porous substrates comprising applying a composition as in claim 4 to at least one of said substrates and joining the substrates for sufficient time to permit the composition to cure.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |