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US4764581A
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Liquid-crystalline diglycidyl compounds, the preparation of these, and the use of these in curable epoxide mixtures
Assignee: Bayer AG
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Filing: 1987-06-22
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Granted: 1988-08-16
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Expires: 2007-06-22
Abstract
Abstract The invention relates to new, liquid-crystalline diglycidyle compounds of optionally ring-substituted 4-hydroxyphenyl 4-hydroxybenzoates, a synthesis of p-epoxypropoxy-phenyl p-epoxy-propoxybenzoate, furthermore epoxy resin mixtures containing the new diglycidyle compounds, and the use of the new diglycidyl compounds and the epoxy resin mixtures thereof in curable mixtures.
Inventors
- 👤 Hanns P. Muller
- 👤 Roland Gipp
- 👤 Heinrich Heine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:15
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/18; C07D303/20; C07D303/24; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/226; C08G59/24; C08G59/245; C08G59/32; C08G59/38; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/20; C09K19/2007; C09K19/34; C09K19/3402; C09K19/3411
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
37 words
Liquid-crystalline diglycidyl compounds of the formula (1) ##STR5## in which R 1 , R 2 , R 3 and R 4 , independently of one another, denote hydrogen, halogen or alkyl having 1 to 6 C atoms.
Claim 2
Dependent Claim
37 words
Liquid-crystalline diglycidyl compounds of the formula (1) ##STR5## in which R 1 , R 2 , R 3 and R 4 , independently of one another, denote hydrogen, halogen or alkyl having 1 to 6 C atoms.
Claim 3
Dependent Claim
22 words
Diglycidyl compounds according to claim 1, characterized in that R 1 , R 2 , R 3 and R 4 is hydrogen.
Claim 4
Dependent Claim
38 words
Process for the preparation of diglycidyl compounds of the formula (I) corresponding to claim 1, characterized in that 4-hydroxyphenyl 4-hydroxybenzoates or ring substituted 4-hydroxyphenyl 4-hydroxybenzoates are reacted, with epichlorohydrin in the presence of catalysts and alkali metal compounds.
Claim 5
Dependent Claim
28 words
Curable mixtures, containing diglycidyl compounds of the formula (I) according to claim 1, optionally blended with di-, tri-, and tetraglycidyl compounds and a curing agent for epoxy resins.
Claim 6
Dependent Claim
13 words
The process of claim 3 wherein the alkali metal compound is sodium hydroxide.
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 |