Patent US4373040A successfully refreshed from Google Patents.
US4373040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy molding compound
Assignee: General Electric Co
•
Filing: 1981-06-05
•
Granted: 1983-02-08
•
Expires: 2001-06-05
Abstract
Abstract An improved molding compound is described. The compound includes: (a) from about 5 to 90% by weight of curable epoxy resin; (b) from about 0.01 to 10% by weight of an aromatic onium salt of the formula: [R.sub.a X].sub.b.sup.+ [C].sup.-b wherein each R is a monovalent organic aromatic radical; X is selected from the group consisting of sulfur and iodine; C is a lewis acid polymerization catalyst precursor; a equals the absolute value of the valence number of (X minus 1); and b equals the absolute value of the valence number of C; (c) from about 0.01 to 10% by weight of peroxide compound effective to activate said catalyst; and (d) from about 10 to 95% by weight of filler, based on the total weight of the composition. These molding compounds exhibit both superior curing rates and storage stability.
Inventors
- 👤 Richard B. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:01
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08K; C08K13/00; C08K13/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
A molding compound comprising: (a) from about 5 to 90% by weight of curable epoxy resin; (b) from about 0.01 to 10% by weight of an aromatic onium salt of the formula: [R.sub.a X].sub.b.sup.+ [C].sup.-b wherein each R is a monovalent organic aromatic radical; X is selected from the group consisting of sulfur and iodine; C is a lewis acid polymerization catalyst precursor; a equals the absolute value of the valence number of (X minus 1); and b equals the absolute value of the valence number of C; (c) from about 0.01 to 10% by weight of peroxide compound effective to activate said catalyst; and (d) from about 10 to 95% by weight of filler, based on the total weight of the composition.
Claim 2
Dependent Claim
123 words
A molding compound comprising: (a) from about 5 to 90% by weight of curable epoxy resin; (b) from about 0.01 to 10% by weight of an aromatic onium salt of the formula: [R.sub.a X].sub.b.sup.+ [C].sup.-b wherein each R is a monovalent organic aromatic radical; X is selected from the group consisting of sulfur and iodine; C is a lewis acid polymerization catalyst precursor; a equals the absolute value of the valence number of (X minus 1); and b equals the absolute value of the valence number of C; (c) from about 0.01 to 10% by weight of peroxide compound effective to activate said catalyst; and (d) from about 10 to 95% by weight of filler, based on the total weight of the composition.
Claim 3
Dependent Claim
30 words
The molding compound of claim 1, wherein the peroxide compound is an organic compound present in an amount which is at least 10% by weight of the aromatic onium salt.
Claim 4
Dependent Claim
13 words
The molding compound of claim 1, wherein the filler comprises a fibrous material.
Claim 5
Dependent Claim
17 words
The molding compound of claim 1, wherein the filler comprises from about 50 to 95% by weight.
Claim 6
Dependent Claim
18 words
The molding compound of claim 1, wherein the epoxy resin comprises from about 5 to 50% by weight.
Claim 7
Dependent Claim
27 words
The molding compound of claim 1, wherein the onium salt and peroxide compound comprise a total of from 1 to 10% by weight based on epoxy resin.
Claim 8
Dependent Claim
98 words
A molding compound comprising: (a) from about 5 to about 90% by weight of a curable epoxy resin consisting essentially of bisphenol A diglycidyl ether epoxy resin; (b) from about 0.01 to 10% by weight of an aromatic onium salt consisting essentially of diphenyliodonium hexafluoroarsenate; (c) from about 0.01 to 10% by weight of a peroxide compound effective to activate said catalyst, said peroxide consisting essentially of dicumyl peroxide; and (d) from about 10 to 95% by weight of a filler consisting essentially of silica, all of the foregoing being based on the total weight of the composition.
Claim 9
Dependent Claim
98 words
A molding compound comprising: (a) from about 5 to about 90% by weight of a curable epoxy resin consisting essentially of bisphenol A diglycidyl ether epoxy resin; (b) from about 0.01 to 10% by weight of an aromatic onium salt consisting essentially of diphenyliodonium hexafluoroarsenate; (c) from about 0.01 to 10% by weight of a peroxide compound effective to activate said catalyst, said peroxide consisting essentially of dicumyl peroxide; and (d) from about 10 to 95% by weight of a filler consisting essentially of silica, all of the foregoing being based on the total weight of the composition.
References Cited (Backward Citations)
US3708296A
Cited
US4173551A
Cited
US4138255A
Cited
US4283312A
Cited
US4216288A
Cited
US4308118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |