US3963796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin composition having excellent latent hardening characteristics
Assignee: Hitachi Ltd
•
Filing: 1971-01-06
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Granted: 1976-06-15
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Expires: 1991-01-06
Abstract
Abstract An epoxy resin composition having a remarkably improved storage stability and an excellent hardening characteristic when heated, which comprises an epoxy resin and an aromatic amino carboxylic acid or a derivative thereof as a hardener for the epoxy resin. This composition can be molded by injection molding, heretofore being deemed inapplicable to epoxy resin compositions, whereby the molded articled of epoxy resin can be produced with a high molding efficiency.
Inventors
- 👤 Hitoshi Yokono
- 👤 Akio Nishikawa
- 👤 Ritsuro Tada
- 👤 Yasuo Miyadera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:54
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/52; Y; Y10; Y10S; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
47 words
An epoxy resin composition comprising an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol A and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof and diaminodiphenylmethane dicarboxylic acid in an amount of substantially equivalent ratio with respect to said epoxy resin.
Claim 2
Dependent Claim
47 words
An epoxy resin composition comprising an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol A and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof and diaminodiphenylmethane dicarboxylic acid in an amount of substantially equivalent ratio with respect to said epoxy resin.
Claim 3
Dependent Claim
87 words
An epoxy resin composition comprising an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol A and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof, diaminodiphenylmethane dicarboxylic acid and an aromatic amino compound having a melting point lower than 200°C but higher than 43°C, said diaminodiphenylmethane dicarboxylic acid and aromatic amino compound being added in the powder form to said epoxy resin in such an amount that amino groups in said compounds are substantially equivalent ratio with respect to said epoxy resin.
Claim 4
Dependent Claim
87 words
An epoxy resin composition comprising an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol A and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof, diaminodiphenylmethane dicarboxylic acid and an aromatic amino compound having a melting point lower than 200°C but higher than 43°C, said diaminodiphenylmethane dicarboxylic acid and aromatic amino compound being added in the powder form to said epoxy resin in such an amount that amino groups in said compounds are substantially equivalent ratio with respect to said epoxy resin.
Claim 5
Dependent Claim
94 words
An epoxy resin composition for use in injection molding which is a powdery composition comprising an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol A and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof, diaminodiphenylmethane dicarboxylic acid and an aromatic amino compound having a melting point lower than 200°C but higher than 43°C, said diaminodiphenylmethane dicarboxylic acid and aromatic amino compound being admixed homogeneously with said epoxy resin in such an amount that amino groups in said compounds are substantially equivalent ratio with respect to said epoxy resin.
Claim 6
Dependent Claim
94 words
An epoxy resin composition for use in injection molding which is a powdery composition comprising an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol A and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof, diaminodiphenylmethane dicarboxylic acid and an aromatic amino compound having a melting point lower than 200°C but higher than 43°C, said diaminodiphenylmethane dicarboxylic acid and aromatic amino compound being admixed homogeneously with said epoxy resin in such an amount that amino groups in said compounds are substantially equivalent ratio with respect to said epoxy resin.
Claim 7
Dependent Claim
15 words
The epoxy resin composition according to claim 2, wherein said aromatic amino compound is diaminodiphenylmethane.
Claim 8
Dependent Claim
15 words
The epoxy resin composition according to claim 3, wherein said aromatic amino compound is diaminodiphenylmethane.
Claim 9
Dependent Claim
61 words
A hardened epoxy resin obtained by heating an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol a and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof and diaminodiphenylmethane dicarboxylic acid in an amount of substantially equivalent ratio with respect to said epoxy resin at a temperature, and for sufficient time to substantially harden said resin.
Claim 10
Dependent Claim
61 words
A hardened epoxy resin obtained by heating an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol a and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof and diaminodiphenylmethane dicarboxylic acid in an amount of substantially equivalent ratio with respect to said epoxy resin at a temperature, and for sufficient time to substantially harden said resin.
Claim 11
Dependent Claim
101 words
A hardened epoxy resin obtained by heating an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol A and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof, diaminodiphenylmethane dicarboxylic acid and an aromatic amino compound having a melting point lower than 200°C but higher than 43°C, said diaminodiphenylmethane dicarboxylic acid and aromatic amino compound being added in the powder form to said epoxy resin in such an amount that amino groups in said compounds are substantially equivalent ratio with respect to said epoxy resin at a temperature, and for sufficient time to substantially harden said resin.
Claim 12
Dependent Claim
101 words
A hardened epoxy resin obtained by heating an epoxy resin selected from the group consisting of polyglycidyl ethers of bis-phenol A and epichlorohydrin, polyglycidyl ethers of a novolac resin and combinations thereof, diaminodiphenylmethane dicarboxylic acid and an aromatic amino compound having a melting point lower than 200°C but higher than 43°C, said diaminodiphenylmethane dicarboxylic acid and aromatic amino compound being added in the powder form to said epoxy resin in such an amount that amino groups in said compounds are substantially equivalent ratio with respect to said epoxy resin at a temperature, and for sufficient time to substantially harden said resin.
Claim 13
Dependent Claim
14 words
The epoxy resin according to claim 7, wherein said aromatic amino compound is diaminodiphenylmethane.
References Cited (Backward Citations)
US2988535A
Cited
US3419525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |