US4764545A
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US
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Process for preparing α-cyanoacrylate type compounds and adhesive composition comprising α-cyanoacrylate type compound obtained by the process as its main component
Assignee: Ohara Paragium Chemical Co Ltd
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Filing: 1987-01-08
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Granted: 1988-08-16
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Expires: 2007-01-08
Abstract
Abstract A process for preparing an α-cyanoacrylate compound characterized by the steps of thermally depolymerizing a condensation product obtained from a cyanoacetic acid ester, and formaldehyde or a polymer thereof using as a catalyst a polymerizable imine represented by the formula ##STR1## wherein R 1 and R 2 are the same or different and are each CH 3 or H to obtain a crude monomer, and rectifying the crude monomer and an adhesive composition comprising as its main component an α-cyanoacrylate compound prepared by the above process.
Inventors
- 👤 Ethuo Yosida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:29
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A process for preparing an α-cyanoacrylate compound characterized by the steps of thermally depolymerizing a condensation product obtained from a cyanoacetic acid ester and formaldehyde or a polymer thereof, using as a catalyst a polymerizable imine represented by the formula ##STR4## wherein R 1 and R 2 are the same or different and are each CH 3 or H to obtain a crude monomer, and rectifying the crude monomer.
Claim 2
Dependent Claim
69 words
A process for preparing an α-cyanoacrylate compound characterized by the steps of thermally depolymerizing a condensation product obtained from a cyanoacetic acid ester and formaldehyde or a polymer thereof, using as a catalyst a polymerizable imine represented by the formula ##STR4## wherein R 1 and R 2 are the same or different and are each CH 3 or H to obtain a crude monomer, and rectifying the crude monomer.
Claim 3
Dependent Claim
50 words
A process as defined in claim 1 wherein a distillation column packed with a plurality of containers each filled with a mixture of phosphorus pentoxide and hydroquinone is used in the thermal depolymerizing step and/or the rectifying step, said containers being adapted to permit the mixture to contact the monomer.
Claim 4
Dependent Claim
101 words
An adhesive composition comprising as its main component an α-cyanoacrylate compound prepared by thermally depolymerizing a condensation product obtained from a cyanoacetic acid ester and formaldehyde or a polymer thereof, using as a catalyst a polymerizable imine represented by the formula ##STR5## wherein R 1 and R are the same or different and are each CH 3 or H to obtain a crude monomer, and rectifying the crude monomer using a distillation column packed with a plurality of containers each filled with a mixture of phosphorus pentoxide and hydroquinone, said containers being adapted to permit the mixture to contact the monomer.
Claim 5
Dependent Claim
101 words
An adhesive composition comprising as its main component an α-cyanoacrylate compound prepared by thermally depolymerizing a condensation product obtained from a cyanoacetic acid ester and formaldehyde or a polymer thereof, using as a catalyst a polymerizable imine represented by the formula ##STR5## wherein R 1 and R are the same or different and are each CH 3 or H to obtain a crude monomer, and rectifying the crude monomer using a distillation column packed with a plurality of containers each filled with a mixture of phosphorus pentoxide and hydroquinone, said containers being adapted to permit the mixture to contact the monomer.
Claim 6
Dependent Claim
18 words
An adhesive composition as defined in claim 3 further comprising finely divided silica surface-treated with a siliceous compound.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |