US4292268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid epoxy molding system
Assignee: Union Carbide Corp
•
Filing: 1980-02-19
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Granted: 1981-09-29
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Expires: 2000-02-19
Abstract
Abstract Injection molding of liquid epoxy resins is facilitated by adding an organic acid plus a siliceous filler to the curable epoxy resin system which thickens and thereby precludes leaking of resin from the mold.
Inventors
- 👤 George A. Salensky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:54
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; B; B29; B29C; B29C45/00; B29C45/0001; C08G; C08G59/00; C08G59/14; C08G59/1433; C08G59/1438; C08G59/145; C08K3/00; C08K3/34; C08K3/36; C08K5/092
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
182 words
Method of injection molding of liquid epoxy resin compositions which comprises: (A) Blending a mixture of: (1) normally liquid epoxy resin having an epoxy equivalent of about 140 to about 225 grams per gram mole of oxirane oxygen; (2) about 3 to about 15 parts by weight of an organic carboxylic acid containing at least 6 carbon atoms and at least one free carboxyl group; (3) about 2 to about 250 parts by weight of a siliceous filler having a minimum surface area of 0.5 m 2 /g.; and (4) about 0 to about 30 parts by weight of a reactive diluent containing at least one 1,2-epoxy group; with an approximately stoichiometric amount of a polyfunctional, primary or secondary amine used as a curing agent for liquid epoxy resins; (B) injecting the resultant mixture at a temperature of about 25° C. to about 150° C. and a pressure of up to about 500 psig into a pressure mold; and (C) retaining the mixture in said mold until hardened sufficiently so that the molded mixture can be ejected from the mold without distortion.
Claim 2
Dependent Claim
182 words
Method of injection molding of liquid epoxy resin compositions which comprises: (A) Blending a mixture of: (1) normally liquid epoxy resin having an epoxy equivalent of about 140 to about 225 grams per gram mole of oxirane oxygen; (2) about 3 to about 15 parts by weight of an organic carboxylic acid containing at least 6 carbon atoms and at least one free carboxyl group; (3) about 2 to about 250 parts by weight of a siliceous filler having a minimum surface area of 0.5 m 2 /g.; and (4) about 0 to about 30 parts by weight of a reactive diluent containing at least one 1,2-epoxy group; with an approximately stoichiometric amount of a polyfunctional, primary or secondary amine used as a curing agent for liquid epoxy resins; (B) injecting the resultant mixture at a temperature of about 25° C. to about 150° C. and a pressure of up to about 500 psig into a pressure mold; and (C) retaining the mixture in said mold until hardened sufficiently so that the molded mixture can be ejected from the mold without distortion.
Claim 3
Dependent Claim
15 words
Method claimed in claim 1 wherein the hardened mixture ejected from the mold is post-cured.
Claim 4
Dependent Claim
19 words
Method claimed in claim 1 wherein the temperature in the mold is about 80° C. to about 110° C.
Claim 5
Dependent Claim
15 words
Method claimed in claim 1 wherein the pressure is about 15 to about 50 psig.
Claim 6
Dependent Claim
19 words
Method claimed in claim 1 wherein the curing agent has an amine value of about 300 to about 3000.
Claim 7
Dependent Claim
12 words
Method claimed in claim 1 wherein the siliceous filler is amorphous silica.
Claim 8
Dependent Claim
12 words
Method claimed in claim 1 wherein the siliceous filler is ground quartz.
Claim 9
Dependent Claim
12 words
Method claimed in claim 1 wherein the siliceous filler is microcrystalline silica.
Claim 10
Dependent Claim
12 words
Method claimed in claim 1 wherein the siliceous filler is macrocrystalline silica.
Claim 11
Dependent Claim
12 words
Method claimed in claim 1 wherein the siliceous filler is calcium metasilicate.
Claim 12
Dependent Claim
17 words
Method claimed in claim 1 wherein the siliceous filler is hydrous aluminum silicate passivated with a silane.
Claim 13
Dependent Claim
13 words
Method claimed in claim 1 wherein the organic carboxylic acid is pamoic acid.
Claim 14
Dependent Claim
25 words
Method claimed in claim 1 wherein the organic carboxylic acid is a dimer acid derived from 9,12-linoleic acid and 9,11-linoleic acid by a Diels-Adler reaction.
Claim 15
Dependent Claim
13 words
Method claimed in claim 1 wherein the organic carboxylic acid is polyacrylic acid.
Claim 16
Dependent Claim
15 words
Method claimed in claim 1 wherein the organic carboxylic acid is a styrene-maleic acid copolymer.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |