Patent US4222918A successfully refreshed from Google Patents.
US4222918A
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Aqueous emulsions, methods of making the same and impregnated rovings made from the emulsions
Assignee: BASF Structural Materials Inc
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Filing: 1979-03-19
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Granted: 1980-09-16
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Expires: 1999-03-19
Abstract
Abstract Aqueous impregnating emulsions for the impregnation of fibrous rovings are provided in which water has emulsified therein particles of epoxy resin in compatible admixture with thermoplastic resin, and a curing agent for the epoxy resin is dispersed in the emulsion, the curing agent being nonreactive under ambient conditions, such as dicyandiamide. Polysulfone resins are preferably used by dissolving them in methylene chloride and then evaporating this solvent after the epoxy resin has been dissolved in. Polycarboxylic acid emulsifying agents provide superior properties in the cured product.
Inventors
- 👤 Mark R. Zentner
- 👤 Edward P. Zahora
- 👤 Angelo F. Leo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:50
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4021; C08J5/00; C08J5/24; C08J5/248; C08L; C08L63/00; C08J2363/00; Y; Y10; Y10S; Y10S525/00; Y10S525/906; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/31504; Y10T428/31511; Y10T428/31525
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
55 words
An aqueous emulsion comprising water having emulsified therein particles of epoxy resin which is a polyepoxide containing more than one 1,2-oxirane group in compatible admixture with thermoplastic resin, and a curing agent for said epoxy resin dispersed in said emulsion, said curing agent being nonreactive with said epoxy resin in said emulsion under ambient conditions.
Claim 2
Dependent Claim
55 words
An aqueous emulsion comprising water having emulsified therein particles of epoxy resin which is a polyepoxide containing more than one 1,2-oxirane group in compatible admixture with thermoplastic resin, and a curing agent for said epoxy resin dispersed in said emulsion, said curing agent being nonreactive with said epoxy resin in said emulsion under ambient conditions.
Claim 3
Dependent Claim
18 words
An aqueous emulsion as recited in claim 1 in which said curing agent is dissolved in the water.
Claim 4
Dependent Claim
15 words
An aqueous emulsion as recited in claim 1 in which said curing agent is dicyandiamide.
Claim 5
Dependent Claim
33 words
An aqueous emulsion as recited in claim 1 in which said particles of epoxy resin in compatible admixture with thermoplastic resin are in solution in an organic solvent of limited miscibility in water.
Claim 6
Dependent Claim
17 words
An aqueous emulsion as recited in claim 4 in which said organic solvent is 2-ethoxy ethanol acetate.
Claim 7
Dependent Claim
18 words
An aqueous emulsion as recited in claim 1 in which said epoxy resin is liquid at room temperature.
Claim 8
Dependent Claim
33 words
An aqueous emulsion as recited in claim 1 in which said particles of epoxy resin in compatible admixture with said thermoplastic resin are emulsified by means of a polycarboxylic acid anionic emulsifying agent.
Claim 9
Dependent Claim
36 words
An aqueous emulsion as recited in either one of claims 1-7 in which said thermoplastic resin is a polysulfone resin present in an amount of from 10% to 60% of the weight of the epoxy resin.
Claim 10
Dependent Claim
47 words
An aqueous emulsion as recited in claim 8 in which said polysulfone resin has the formula: ##STR4## wherein N ranges from about 30 to about 300, and said polysulfone resin is present in an amount of from 20% to 45% of the weight of the epoxy resin.
Claim 11
Independent Claim
71 words
A method of producing an aqueous emulsion of epoxy resin which is a polyepoxide containing more than one 1,2-oxirane group in compatible admixture with thermoplastic resin comprising dissolving said thermoplastic resin in a volatile solvent for both resins to produce a solution, dissolving said epoxy resin in said solution, evaporating said volatile solvent to produce a compatible hot melt mixture, and then emulsifying said mixture into water containing an emulsifying agent.
Claim 12
Independent Claim
71 words
A method of producing an aqueous emulsion of epoxy resin which is a polyepoxide containing more than one 1,2-oxirane group in compatible admixture with thermoplastic resin comprising dissolving said thermoplastic resin in a volatile solvent for both resins to produce a solution, dissolving said epoxy resin in said solution, evaporating said volatile solvent to produce a compatible hot melt mixture, and then emulsifying said mixture into water containing an emulsifying agent.
Claim 13
Dependent Claim
23 words
A method as recited in claim 10 in which said compatible mixture is emulsified in the form of an essentially solvent-free hot melt.
Claim 14
Dependent Claim
29 words
A method as recited in claim 10 in which said compatible mixture is emulsified in the form of a solution of an organic solvent of limited miscibility in water.
Claim 15
Dependent Claim
23 words
A method as recited in claim 10 in which said thermoplastic resin is a polysulfone resin and said volatile solvent is methylene chloride.
Claim 16
Dependent Claim
21 words
A method as recited in claim 13 in which said organic solvent of limited miscibility in water is 2-ethoxy ethanol acetate.
Claim 17
Independent Claim
22 words
A method as recited in either one of claims 10-14 in which said emulsifying agent is a polycarboxylic acid anionic emulsifying agent.
Claim 18
Dependent Claim
58 words
A method as recited in claim 15 in which said emulsifying agent has the formula: ##STR5## where R is an alkyl group containing 4-20 carbon atoms, R 1 is methylene or nothing, and Z is an alkali metal, and a and b have a ratio of 9:1 to 1:1 and together provide a molecular weight of about 500-5000.
Claim 19
Dependent Claim
20 words
A method as recited in claim 10 in which a water solution of dicyandiamide is incorporated in said aqueous emulsion.
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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |