US4284753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat curable polyepoxide-unsaturated aromatic monomer resin compositions
Assignee: Shell USA Inc
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Filing: 1980-04-14
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Granted: 1981-08-18
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Expires: 2000-04-14
Abstract
Abstract Heat curable epoxy-styrene compositions exhibiting improved processability, low viscosity and long pot life, which when cured with a special acid anhydride/onium salt epoxy curing blend in combination with a free-radical catalyst, yield cured products exhibiting improved physical properties, such as increased heat deflection temperature, increased flexural strength and increased flexibility.
Inventors
- 👤 Ralph W. Hewitt, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:26
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08F; C08F283/00; C08F283/10; C08G59/68
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
A heat-curable composition comprising: (1) from about 50 to about 99 parts by weight of a polyepoxide possessing more than one vic-epoxy group, (2) from about 1 to about 50 parts by weight of an unsaturated aromatic monomer, (3) from about 0.25 to about 2.0 stoichiometric equivalents based on the polyepoxide of a carboxyl-containing compound, (4) an epoxy curing accelerator composition comprising from about 0.001 to about 10 parts by weight per 100 parts by weight of the polyepoxide of an onium compound, and (5) a curing amount of a free-radical curing agent.
Claim 2
Dependent Claim
93 words
A heat-curable composition comprising: (1) from about 50 to about 99 parts by weight of a polyepoxide possessing more than one vic-epoxy group, (2) from about 1 to about 50 parts by weight of an unsaturated aromatic monomer, (3) from about 0.25 to about 2.0 stoichiometric equivalents based on the polyepoxide of a carboxyl-containing compound, (4) an epoxy curing accelerator composition comprising from about 0.001 to about 10 parts by weight per 100 parts by weight of the polyepoxide of an onium compound, and (5) a curing amount of a free-radical curing agent.
Claim 3
Dependent Claim
36 words
The composition of claim 1 wherein the polyepoxide is a glycidyl polyether of 2,2-bis(4-hydroxyphenyl)propane having an average molecular weight of about 300 to about 3000 and an epoxide equivalent weight between about 140 and about 2000.
Claim 4
Dependent Claim
15 words
The composition of claim 1 wherein the polyepoxide is a glycidyl polyether of hydrogenated 2,2-bis(4-hydroxyphenyl)propane.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein the unsaturated aromatic monomer is styrene.
Claim 6
Dependent Claim
25 words
The composition of claim 1 wherein the carboxyl-containing compound is an acid anhydride having a melting point between about 150° C. and about 250° C.
Claim 7
Dependent Claim
12 words
The composition of claim 5 wherein the acid anhydride is trimellitic anhydride.
Claim 8
Dependent Claim
13 words
The composition of claim 5 wherein the acid anhydride is 3,3',4,4'-benzophenone tetracarboxylic dianhydride.
Claim 9
Dependent Claim
12 words
The composition of claim 5 wherein the acid anhydride is chlorendic anhydride.
Claim 10
Dependent Claim
13 words
The composition of claim 1 wherein the onium-salt is a quarternary ammonium halide.
Claim 11
Dependent Claim
14 words
The composition of claim 9 wherein the quarternary ammonium halide is tetramethyl ammonium chloride.
Claim 12
Dependent Claim
13 words
The composition of claim 1 wherein the onium salt is a phosphonium halide.
Claim 13
Dependent Claim
14 words
The composition of claim 11 wherein the phosphonium halide is ethyl triphenyl phosphonium iodide.
Claim 14
Dependent Claim
13 words
The composition of claim 1 containing at least one additional epoxy curing co-accelerator.
Claim 15
Dependent Claim
22 words
The composition of claim 13 wherein the co-accelerator is a stannous salt of a monocarboxylic acid having at least two carbon atoms.
Claim 16
Dependent Claim
12 words
The composition of claim 14 wherein the stannous salt is stannous octoate.
Claim 17
Dependent Claim
13 words
The composition of claim 1 wherein the free-radical curing agent is a peroxide.
Claim 18
Dependent Claim
10 words
The composition of claim 16 wherein the peroxide is 2,5-dimethyl-2,5-bis(tertiary-butylperoxy)hexane.
Claim 19
Dependent Claim
31 words
The composition of claim 1 containing from about 75 to about 95 parts by weight of polyepoxide and from about 5 to about 25 parts by weight of unsaturated aromatic monomer.
References Cited (Backward Citations)
US2691007A
Cited
US2633458A
Cited
US2939859A
Cited
US3009898A
Cited
US3099638A
Cited
US3419348A
Cited
US3336241A
Cited
US3356624A
Cited
US3446762A
Cited
US3547885A
Cited
US3574157A
Cited
US3634542A
Cited
US3637618A
Cited
US3784583A
Cited
US4026862A
Cited
US4072804A
Cited
US4013987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |