US4485218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encapsulating composition for inductive devices containing elastomeric polybutadiene having predominate trans-1,4 configuration
Assignee: General Electric Co
•
Filing: 1982-02-18
•
Granted: 1984-11-27
•
Expires: 2002-02-18
Abstract
Abstract Encapsulating compositions for inductive devices have a polybutadiene base, predominate in trans-1,4 polybutadiene, and include cis-1,4 polybutadiene and vinyl-1,2 polybutadiene, together with an initiator, an inhibitor and a co-agent for improving the curing of the composition. The compositions are usable at higher temperatures, based on a conditioning of the composition during cure at or near the projected use temperature. When combined with high temperature conductor insulation coatings, such as polyimides, a high temperature soft cure encapsulation is achieved from which an inductive device may be liberated without damage to the device.
Inventors
- 👤 Gordon M. Bell
- 👤 James R. Ridlen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:39
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; C; C08; C08L; C08L9/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31696
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A composition for use in the insulation of electrical equipment consisting essentially of: ______________________________________
Ingredient Parts
______________________________________
elastomeric polybutadiene consisting
100
of about 54 to about 66 weight
percent trans-1,4 polybutadiene,
about 16 to about 24 weight percent
cis-1,4 polybutadiene, and about
16 to about 24 weight percent
vinyl-1,2 polybutadiene
vinyl toluene 0 to 40
trimethylol propane trimethacrylate
0 to 10
peroxide crosslinking agent
2.5 to 5
inhibitor 0.1 to 0.9.
______________________________________
Claim 2
Dependent Claim
72 words
A composition for use in the insulation of electrical equipment consisting essentially of: ______________________________________
Ingredient Parts
______________________________________
elastomeric polybutadiene consisting
100
of about 54 to about 66 weight
percent trans-1,4 polybutadiene,
about 16 to about 24 weight percent
cis-1,4 polybutadiene, and about
16 to about 24 weight percent
vinyl-1,2 polybutadiene
vinyl toluene 0 to 40
trimethylol propane trimethacrylate
0 to 10
peroxide crosslinking agent
2.5 to 5
inhibitor 0.1 to 0.9.
______________________________________
Claim 3
Dependent Claim
35 words
The composition of claim 1 in which the range of vinyl toluene and trimethylol propane trimethacrylate is as follows: ______________________________________
Ingredients Parts
______________________________________
vinyl toluene 17 to 25
trimethylol propane
4 to 8
trimethylacrylate
______________________________________
Claim 4
Dependent Claim
17 words
The composition of claim 1 cured at a temperature proximately equal to the temperature of intended use.
Claim 5
Dependent Claim
17 words
The composition of claim 2 cured at a temperature proximately equal to the temperature of intended use.
Claim 6
Dependent Claim
12 words
The composition of claim 1 cured at a temperature proximate 220° C.
Claim 7
Dependent Claim
87 words
A composition for use in the insulation of electrical equipment consisting essentially of: ______________________________________
Ingredient Parts
______________________________________
elastomeric polybutadiene consisting
100
of about 54 to about 66 weight
percent trans-1,4 polybutadiene,
about 16 to about 24 weight percent
cis-1,4 polybutadiene, and about
16 to about 24 weight percent
vinyl-1,2 polybutadiene
vinyl toluene 0 to 40
trimethylol propane trimethacrylate
0 to 10
peroxide crosslinking agent
2.5 to 5
inhibitor 0.1 to 0.9
______________________________________ said composition being cured at a temperature of about 210° C. to about 220° C.
Claim 8
Dependent Claim
87 words
A composition for use in the insulation of electrical equipment consisting essentially of: ______________________________________
Ingredient Parts
______________________________________
elastomeric polybutadiene consisting
100
of about 54 to about 66 weight
percent trans-1,4 polybutadiene,
about 16 to about 24 weight percent
cis-1,4 polybutadiene, and about
16 to about 24 weight percent
vinyl-1,2 polybutadiene
vinyl toluene 0 to 40
trimethylol propane trimethacrylate
0 to 10
peroxide crosslinking agent
2.5 to 5
inhibitor 0.1 to 0.9
______________________________________ said composition being cured at a temperature of about 210° C. to about 220° C.
Claim 9
Dependent Claim
35 words
The composition of claim 6 in which the range of vinyl toluene and trimethylol propane trimethacrylate is as follows: ______________________________________
Ingredient Parts
______________________________________
vinyl toluene 17 to 25
trimethylol propane
4 to 8
trimethacrylate
______________________________________
Claim 10
Independent Claim
79 words
The method of forming a relatively soft composition for encapsulating inductive devices intended for use at a predetermined use temperature, comprising admixing an elastomeric polybutadiene consisting of about 54 to about 66 weight percent trans-1,4-polybutadiene, about 16 to about 24 weight percent cis-1,4 polybutadiene, and about 16 to about 24 weight percent vinyl-1,2 polybutadiene with a peroxide crosslinking agent, and heating the composition at a temperature proximate to the temperature of intended use to effect a soft cure thereof.
Claim 11
Independent Claim
79 words
The method of forming a relatively soft composition for encapsulating inductive devices intended for use at a predetermined use temperature, comprising admixing an elastomeric polybutadiene consisting of about 54 to about 66 weight percent trans-1,4-polybutadiene, about 16 to about 24 weight percent cis-1,4 polybutadiene, and about 16 to about 24 weight percent vinyl-1,2 polybutadiene with a peroxide crosslinking agent, and heating the composition at a temperature proximate to the temperature of intended use to effect a soft cure thereof.
Claim 12
Dependent Claim
39 words
The method of claim 8 wherein the admixed ingredients comprise: ______________________________________
Ingredients Parts
______________________________________
elastomeric polybutadiene
100
vinyl toluene 0 to 40
trimethylol propane
0 to 10
trimethylacrylate
peroxide crosslinking agent
2.5 to 5
inhibitor 0.1 to 0.9
______________________________________
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |