US5149730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin composition
Assignee: Resolution Performance Products LLC
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Filing: 1990-06-13
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Granted: 1992-09-22
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Expires: 2010-06-13
Abstract
Abstract An electrical encapsulation formulation is provided comprising a diglycidyl ether of a 4,4'-dihydroxybiphenyl, a trisphenolic curing agent, a cure accelerator and an inorganic filler. The composition cures rapidly and exhibits excellent resistance to cracking under high-temperature operation.
Inventors
- 👤 Yasuyuki Murata
- 👤 Isako Konishi
- 👤 Ryohei Tanaka
- 👤 Yoshinori Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:17
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C08G59/245; C08L; C08L63/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
An electrical encapsulation composition comprising: (a) a diglycidyl ether which can be represented by the formula ##STR4## in which each X is independently selected from H, halide and C 1-5 alkyl, and n has an average valve within the range of 0 to about 3; (b) a curing amount of a trisphenolic curing agent which is the product of reacting, in the presence of an acid condensation reaction catalyst, a substituted or unsubstituted phenolic hydroxyl group-containing aromatic aldehyde or ketone and a substituted or unsubstituted phenol; (c) an accelerating amount of a cure accelerator; and (d) at least about 50 weight percent, based on the weight of the composition, of an inorganic filler.
Claim 2
Dependent Claim
113 words
An electrical encapsulation composition comprising: (a) a diglycidyl ether which can be represented by the formula ##STR4## in which each X is independently selected from H, halide and C 1-5 alkyl, and n has an average valve within the range of 0 to about 3; (b) a curing amount of a trisphenolic curing agent which is the product of reacting, in the presence of an acid condensation reaction catalyst, a substituted or unsubstituted phenolic hydroxyl group-containing aromatic aldehyde or ketone and a substituted or unsubstituted phenol; (c) an accelerating amount of a cure accelerator; and (d) at least about 50 weight percent, based on the weight of the composition, of an inorganic filler.
Claim 3
Dependent Claim
28 words
The composition of claim 1 in which the phenolic hydroxyl group-containing aromatic aldehyde or ketone is selected from the group consisting of hydroxybenzaldehyde, methylhydroxybenzaldehyde, methoxyhydroxybenzaldehyde, hydroxyacetophenone, and hydroxyphenylethylketone.
Claim 4
Dependent Claim
32 words
The composition of claim 2 in which the phenol is selected from the group consisting of phenol, cresol, xylenol, ethylphenol, butylphenol, phenylphenol, nonylphenol, butylcresol, bromophenol, chlorophenol, hydroquinone, resorcinol, bisphenol-A, bisphenol-F and biphenol.
Claim 5
Dependent Claim
19 words
The composition of claim 1 in which the diglycidyl ether is selected from diglycidyl ethers of 4,4'-dihydroxybiphenyl and 4,4'-dihydroxy-3,3',5,5'-tetramethylbiphenyl.
Claim 6
Dependent Claim
19 words
The composition of claim 4 in which the trisphenolic curing agent is the reaction product of hydroxybenzaldehyde and phenol.
Claim 7
Dependent Claim
19 words
The composition of claim 4 in which the trisphenolic curing agent is the reaction product of p-hydroxyacetophenone and phenol.
Claim 8
Dependent Claim
11 words
The composition of claim 4 in which the accelerator is triphenylphosphine.
Claim 9
Dependent Claim
11 words
The composition of claim 1 in which the filler comprises silica.
Claim 10
Dependent Claim
26 words
The composition of claim 1 which further comprises up to about 50 weight percent, based on the weight of epoxy components, of a second epoxy resin.
Claim 11
Dependent Claim
35 words
The composition of claim 1 in which the trisphenolic curing agent is present in an amount within the range of about 20 to about 200 weight percent, based on the weight of the diglycidyl ether.
Claim 12
Dependent Claim
57 words
A process for increasing the cure rate of a phenolic-cured electrical encapsulation composition comprising a diglycidyl ether of 4,4'-bishydroxybiphenyl, the process comprising incorporating in the composition a trisphenolic curing agent which is the product of the acid-catalyzed condensation reaction of a substituted or unsubstituted phenolic hydroxyl group-containing aromatic aldehyde or ketone and a substituted or unsubstituted phenol.
Claim 13
Dependent Claim
57 words
A process for increasing the cure rate of a phenolic-cured electrical encapsulation composition comprising a diglycidyl ether of 4,4'-bishydroxybiphenyl, the process comprising incorporating in the composition a trisphenolic curing agent which is the product of the acid-catalyzed condensation reaction of a substituted or unsubstituted phenolic hydroxyl group-containing aromatic aldehyde or ketone and a substituted or unsubstituted phenol.
Claim 14
Dependent Claim
15 words
An article of manufacture comprising an electrical component and the cured composition of claim 1.
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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) | 1995-09-22 | 1996-03-23 | 1996-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-22 | 2000-03-23 | 2000-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-22 | 2004-03-23 | 2004-09-22 | $7700.00 | Window Closed / Lapsed |