Patent US3968084A successfully refreshed from Google Patents.
US3968084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable composition of epoxy resin and cured product thereof
Assignee: Bridgestone Corp
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Filing: 1974-11-25
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Granted: 1976-07-06
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Expires: 1994-11-25
Abstract
Abstract A curable epoxy resin composition containing an epoxy resin and, as a curing agent, 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane, as well as the cured resins produced from such composition, the curable resin being useful for paints, adhesives, and molded articles.
Inventors
- 👤 Toshio Yukuta
- 👤 Takashi Ohashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:11
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4035
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
36 words
A curable epoxy resin composition which comprises an epoxy resin having one or more epoxy groups per molecule and 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane in an amount sufficient to act as a curing agent and produce a cured epoxy resin.
Claim 2
Dependent Claim
36 words
A curable epoxy resin composition which comprises an epoxy resin having one or more epoxy groups per molecule and 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane in an amount sufficient to act as a curing agent and produce a cured epoxy resin.
Claim 3
Dependent Claim
35 words
A curable composition acording to claim 1, the amount of 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane to epoxy resin being within the range of from 0.80 to 1.20 equivalent ratio of curing agent to epoxy groups in the epoxy material.
Claim 4
Dependent Claim
37 words
A curable composition according to claim 1, in which the amount of 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane to epoxy resin is within the range of from 0.95 to 1.05 equivalent ratio of curing agent to epoxy groups in the epoxy material.
Claim 5
Dependent Claim
42 words
A curable composition according to claim 1, said epoxy resin being selected from the class consisting of bis phenol-A epoxy resin, phthalic acid glycidyl ester epoxy resin, the condensate of poly hydroxy alcohol with epichlorohydrin, tris-2,3-epoxy propyl isocyanurate and novolak epoxy resin.
Claim 6
Dependent Claim
50 words
A curable composition of epoxy resin which comprises a bis phenol-A epoxy resin or a condensate of polyhydric alcohol with epichlorohydrin and 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a curing agent, the equivalent amount of said curing agent to epoxy groups in said epoxy resin being within the range of from 0.95 to 1.05.
Claim 7
Dependent Claim
50 words
A curable composition of epoxy resin which comprises a bis phenol-A epoxy resin or a condensate of polyhydric alcohol with epichlorohydrin and 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a curing agent, the equivalent amount of said curing agent to epoxy groups in said epoxy resin being within the range of from 0.95 to 1.05.
Claim 8
Dependent Claim
49 words
An epoxy resin which is obtained by curing an epoxy resin having one or more epoxy groups per molecule in the presence of 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a curing agent at a temperature of from 100° to 180°C, the amount of the curing agent being sufficient to produce a cured resin.
Claim 9
Dependent Claim
49 words
An epoxy resin which is obtained by curing an epoxy resin having one or more epoxy groups per molecule in the presence of 3,9-bis(2-hydrazidoethyl)-2,4,8,10-tetraoxaspiro-[5,5]-undecane as a curing agent at a temperature of from 100° to 180°C, the amount of the curing agent being sufficient to produce a cured resin.
References Cited (Backward Citations)
US3467707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |