Patent US4481349A successfully refreshed from Google Patents.
US4481349A
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Hardener for epoxy resins and process for hardening epoxy resins
Assignee: Hoechst AG
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Filing: 1983-09-08
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Granted: 1984-11-06
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Expires: 2003-09-08
Abstract
Abstract Hardener for epoxy resins based on (a) araliphatic or cycloaliphatic diamines with 4 amino hydrogen atoms, which are liquid at ambient temperature, or derivatives thereof with at least 3 amino hydrogen atoms, (b) optionally conventional modifiers for the polyamines according to (a) and (c) optionally conventional additives, containing (d) 0.1 to 10% by weight of primary aliphatic monoamines the alkyl groups of which contain 5 to 18 carbon atoms, and a process for hardening epoxy resins with hardeners of this kind.
Inventors
- 👤 Manfred Marten
- 👤 Wilhelm Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:57
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
A hardener composition for epoxy resins comprising (a) an araliphatic or cycloaliphatic diamine having 4 amino hydrogen atoms or a derivative thereof having at least 3 amino hydrogen atoms, said diamine or derivative thereof being liquid at room temperature, together with (b) 0.1 to 10 percent by weight of a primary aliphatic monoamine having 5 to 18 carbon atoms, the percentage being referred to the total amount of diamine, its derivative and monoamine.
Claim 2
Dependent Claim
73 words
A hardener composition for epoxy resins comprising (a) an araliphatic or cycloaliphatic diamine having 4 amino hydrogen atoms or a derivative thereof having at least 3 amino hydrogen atoms, said diamine or derivative thereof being liquid at room temperature, together with (b) 0.1 to 10 percent by weight of a primary aliphatic monoamine having 5 to 18 carbon atoms, the percentage being referred to the total amount of diamine, its derivative and monoamine.
Claim 3
Dependent Claim
25 words
A hardener composition as claimed in claim 1, wherein the amount of aliphatic monoamine is in the range from 0.5 to 5 percent by weight.
Claim 4
Dependent Claim
20 words
A hardener composition as claimed in claim 1, wherein the primary aliphatic monoamine has from 6 to 10 carbon atoms.
Claim 5
Dependent Claim
18 words
A hardener composition as claimed in claim 1, wherein component (a) contains m-xylylene diamine or a derivative thereof.
Claim 6
Dependent Claim
17 words
A hardener composition as claimed in claim 1, wherein the derivative of the diamine is a Mannich-base.
Claim 7
Dependent Claim
14 words
A hardener composition as claimed in claim 1 which also contains a modifying agent.
Claim 8
Dependent Claim
29 words
A hardener composition as claimed in claim 6, wherein the modifying agent is a solvent which is capable of dissolving as well components (a) and (b) as epoxy resins.
Claim 9
Dependent Claim
24 words
A hardener composition as claimed in claim 1 which also contains a further additive selected from the group consisting of fillers and auxiliary agents.
Claim 10
Dependent Claim
91 words
A process for hardening an epoxy resin which is liquid by itself or dissolved in a solvent, with a hardener composition for epoxy resins comprising (a) an araliphatic or cycloaliphatic diamine having 4 amino hydrogen atoms or a derivative thereof having at least 3 amino hydrogen atoms, said diamine or derivative thereof being liquid at room temperature, together with (b) 0.1 to 10 percent by weight of a primary aliphatic monoamine having 5 to 18 carbon atoms, the percentage being referred to the total amount of diamine, its derivative and monoamine.
Claim 11
Dependent Claim
91 words
A process for hardening an epoxy resin which is liquid by itself or dissolved in a solvent, with a hardener composition for epoxy resins comprising (a) an araliphatic or cycloaliphatic diamine having 4 amino hydrogen atoms or a derivative thereof having at least 3 amino hydrogen atoms, said diamine or derivative thereof being liquid at room temperature, together with (b) 0.1 to 10 percent by weight of a primary aliphatic monoamine having 5 to 18 carbon atoms, the percentage being referred to the total amount of diamine, its derivative and monoamine.
Claim 12
Dependent Claim
16 words
A process as claimed in claim 9, wherein the epoxy resin is liquid at room temperature.
Claim 13
Dependent Claim
18 words
A process as claimed in claim 9, wherein the molecular weight of the epoxy resin is below 600.
Claim 14
Dependent Claim
20 words
A process as claimed in claim 9, wherein component (a) of the hardener composition is m-xylylene diamine or its Mannich-base.
Claim 15
Dependent Claim
16 words
A hardened article comprising an epoxide hardened by a hardener composition as claimed in claim 1.
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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |