Patent US4686247A successfully refreshed from Google Patents.
US4686247A
Expired / Lapsed
US
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Adhesive composition
Assignee: Ohara Paragium Chemical Co Ltd
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Filing: 1986-07-11
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Granted: 1987-08-11
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Expires: 2006-07-11
Abstract
Abstract An adhesive composition characterized in that the composition is prepared by subjecting finely divided hydrophobic silica surface-treated with hexamethyldisilazane to a heat treatment under a reduced pressure, subsequently treating the silica with an acid gas, and admixing the resulting silica with an alpha -cyanoacrylate.
Inventors
- 👤 Ethuo Yosida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:51
CPC Classifications
C; C09; C09J; C09J4/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
An adhesive composition characterized in that the composition is prepared by subjecting finely divided hydrophobic silica surface-treated with hexamethyldisilazane to a heat treatment under a reduced pressure, subsequently treating the silica with an acid gas, and admixing the resulting silica with an α-cyanoacrylate.
Claim 2
Dependent Claim
43 words
An adhesive composition characterized in that the composition is prepared by subjecting finely divided hydrophobic silica surface-treated with hexamethyldisilazane to a heat treatment under a reduced pressure, subsequently treating the silica with an acid gas, and admixing the resulting silica with an α-cyanoacrylate.
Claim 3
Dependent Claim
33 words
A composition as defined in claim 1 wherein the heat treatment is conducted under a reduced pressure of up to 10 mm Hg at 40° to 200° C. for 5 to 30 hours.
Claim 4
Dependent Claim
58 words
A composition as defined in claim 1 wherein the acid gas is in the form of a gas at a pressure of 760 mm Hg at a temperature of up to 25° C. and is a compound selected from the group consisting of fluorides of elements from the groups III, IV and V, hydrogen halides and acid oxides.
Claim 5
Dependent Claim
23 words
A composition as defined in claim 1 wherein the acid gas is at least one of SO 2 , BF 3 and HCl.
Claim 6
Dependent Claim
55 words
A composition as defined in claim 1 wherein the acid gas treatment is so conducted that when the resulting silica is dispersed in an aqueous solution composed of 50 vol. % of methanol and 50 vol. % of water to a concentration of 4 wt. %, the solution exhibits a pH of 2.6 to 6.2.
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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) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |