Patent US4975500A successfully refreshed from Google Patents.
US4975500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adducts of metabrominated phenols and polyfunctional epoxides
Assignee: Huntsman Advanced Materials Americas LLC
•
Filing: 1989-11-22
•
Granted: 1990-12-04
•
Expires: 2009-11-22
Abstract
Abstract Adducts of metabrominated monophenols such as 3,5-dibromo-2,4,6-trimethylphenol and multifunctional epoxides such as cresol-formaldehyde epoxy novolac resins are disclosed to be useful in formulations for encapsulating electronic components.
Inventors
- 👤 Chun S. Wang
- 👤 Abel Mendoza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:35
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; C; C07; C07D; C07D303/00; C07D303/02; C07D303/12; C07D303/18; C07D303/20; C07D303/24; C08; C08G; C08G59/00; C08G59/14; C08G59/1433; C08G59/1438; C08G59/1444; C08G59/145; C08G59/18; C08G59/20; C08G59/32; C08G59/36; H10; H10W; H10W74/00; H10W74/40; H10W74/47
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
An encapsulating formulation which comprises (I) an epoxy-containing composition selected from (A) a composition which comprises an adduct prepared by reacting (1) a metabrominated monophenol and (2) a multifunctional polyepoxide having an average of more than two vicinal epoxide groups per molecule; wherein components (1) and (2) are employed in quantities which provide a ratio of phenolic hydroxyl groups to epoxide groups of from about 0.05:1 to about 0.5:1; or (B) a mixture comprising (1) a glycidyl ether of a metabrominated monophenol and (2) a polyepoxide having an average of more than one vicinal epoxide group per molecule; wherein components (1) and (2) are employed in quantities which provide the resultant mixture with a bromine content of from about 2 to about 20 percent by weight; and (II) a curing amount of a curing agent for component (I).
Claim 2
Dependent Claim
138 words
An encapsulating formulation which comprises (I) an epoxy-containing composition selected from (A) a composition which comprises an adduct prepared by reacting (1) a metabrominated monophenol and (2) a multifunctional polyepoxide having an average of more than two vicinal epoxide groups per molecule; wherein components (1) and (2) are employed in quantities which provide a ratio of phenolic hydroxyl groups to epoxide groups of from about 0.05:1 to about 0.5:1; or (B) a mixture comprising (1) a glycidyl ether of a metabrominated monophenol and (2) a polyepoxide having an average of more than one vicinal epoxide group per molecule; wherein components (1) and (2) are employed in quantities which provide the resultant mixture with a bromine content of from about 2 to about 20 percent by weight; and (II) a curing amount of a curing agent for component (I).
Claim 3
Dependent Claim
60 words
A composition of claim 1 wherein components (I-A-1) and (I-A-2) are employed in quantities which provide a ratio of phenolic hydroxyl groups to epoxide groups of from about 0.07:1 to about 0.35:1; and components (I-B-1) and (I-B-2) are employed in quantities which provide the resultant mixture with a bromine content of from about 5 to about 15 percent by weight.
Claim 4
Dependent Claim
60 words
A composition of claim 2 wherein components (I-A-1) and (I-A-2) are employed in quantities which provide a ratio of phenolic hydroxyl groups to epoxide groups of from about 0.1:1 to about 0.2:1; and components (I-B-1) and (I-B-2) are employed in quantities which provide the resultant mixture with a bromine content of from about 5 to about 12 percent by weight.
Claim 5
Dependent Claim
82 words
A composition of claim 3 wherein component (I-A-1) is 3,5-dibromo-2,4,6-trimethylphenol, 3-bromo-2,4,6-trimethylphenol, 3,5-dibromophenol, 3-bromophenol, 3-bromo-2,4,5,6-tetramethylphenol, 3,5-dibromo-2,4,6-triethylphenol, 3-bromo-2,4,6-triethylphenol or a combination thereof; component (I-A-2) is an epoxy novolac resin, or a triglycidylether of trihydroxyphenyl methane; component (I-B-1) is a glycidyl ether of any of the following:3,5-dibromo-2,4,6-trimethylphenol, 3-bromo-2,4,6-trimethylphenol, 3,5-dibromophenol, 3-bromophenol, 3-bromo-2,4,5,6-tetramethylphenol, 3,5-dibromo-2,4,6-triethylphenol, 3-bromo-2,4,6-triethylphenol or a combination thereof; component (I-B-2) is an epoxy novolac resin, or a triglycidylether of tri(hydroxyphenyl)methane and component II is a material having an average of more than one phenolic hydroxyl groups.
Claim 6
Dependent Claim
41 words
A composition of claim 4 wherein component (I-A-1) is 3,5-dibromo-2,4,6-trimethylphenol; component (I-A-2) is a cresol-formaldehyde epoxy novolac resin; component (I-B-1) is glycidyl ether of 3,5-dibromo-2,4,6-trimethylphenol; component (I-B-2) is a cresol-formaldehyde epoxy novolac resin and component (II) is a phenol-formaldehyde novolac resin.
References Cited (Backward Citations)
US3367990A
Cited
GB999243A
Cited
US3723335A
Cited
US3775355A
Cited
US4358577A
Cited
US4567242A
Cited
US4501787A
Cited
US4604317A
Cited
US4559395A
Cited
US4914185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |