Patent US3941725A successfully refreshed from Google Patents.
US3941725A
Expired / Lapsed
US
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Process for the manufacture of epoxide resin foams
Assignee: Novartis Corp
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Filing: 1974-09-09
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Granted: 1976-03-02
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Expires: 1994-09-09
Abstract
Abstract Epoxide resin foams are manufactured by curing a mixture which contains an epoxide resin, a blowing agent, a surface-active agent and the tetraglycidyl ester of cyclohexanone- or methylcyclohexanone-2,2,6,6-tetrapropionic acid, with a Lewis acid or an addition compound or complex compound of a Lewis acid. The foams obtained show a homogeneous pore structure and no tendency to crack formation, and are heat-stable and largely light-fast. They can be employed in sandwich constructions, as insulating materials against heat and cold, sound and mechanical impact, and in the electrical industry.
Inventors
- 👤 Andre Schmitter
- 👤 Rolf Hugi
- 👤 Wolfgang Seiz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/32; C08G59/3218; C08G59/38; C08J2363/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
Process for the manufacture of epoxide resin foams using a resin mixture which contains an epoxide resin based on bisphenol A or a polyester containing epoxide groups and/or an aliphatic polyglycidyl ether and/or a cycloaliphatic epoxide resin and also a blowing agent and a surface-active agent for regulating the pore structure, characterised in that the resin mixture furthermore contains the tetraglycidyl ester of cyclohexanone- or methylcyclohexanone-tetrapropionic acid of the formula I ##SPC5## in which R denotes hydrogen or the methyl group, and that the curing is carried out with a Lewis acid or an addition compound or complex compound of a Lewis acid.
Claim 2
Dependent Claim
103 words
Process for the manufacture of epoxide resin foams using a resin mixture which contains an epoxide resin based on bisphenol A or a polyester containing epoxide groups and/or an aliphatic polyglycidyl ether and/or a cycloaliphatic epoxide resin and also a blowing agent and a surface-active agent for regulating the pore structure, characterised in that the resin mixture furthermore contains the tetraglycidyl ester of cyclohexanone- or methylcyclohexanone-tetrapropionic acid of the formula I ##SPC5## in which R denotes hydrogen or the methyl group, and that the curing is carried out with a Lewis acid or an addition compound or complex compound of a Lewis acid.
Claim 3
Dependent Claim
39 words
Process according to claim 1, characterised in that the ratio of epoxide resin to compound of the formula I in the resin mixture is 25 to 75 per cent by weight to 75 to 25 per cent by weight.
Claim 4
Dependent Claim
29 words
Process according to claim 1, characterised in that the curing agent is employed in an amount of 0.3 to 2 per cent by weight, based on the resin mixture.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |