US3755241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Potting compound and method of potting
Assignee: Honeywell International Inc
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Filing: 1971-06-30
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Granted: 1973-08-28
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Expires: 1991-06-30
Abstract
Abstract A potting compound is used to embed delicate or coordinated instruments within a casing to protect them from shock or vibration which would destroy them or derange them. The essential ingredients of the potting compound are dihydroxypolybutadiene, an extender oil, a microfine polypropylene powder, and an organic diisocyanate. The resulting compound is presumed to have an oilmodified polyurethane structure as a matrix enclosing the polypropylene powder as an integrated, dispersed phase. The compound has high adhesion to practically everything used in potting, requires no interlayer, is flexible at -65* F. and is heat resistant for short periods at 260* F.
Inventors
- 👤 T Brady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:12
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C08L; C08L75/00; C08L75/04; C08L75/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
35 words
A composition according to claim 1 in which n is from 44 to 60, the viscosity is not substantially over 100 poises at 30* C., and the diisocyanate is from the class of tolylene diisocyanates.
Claim 2
Dependent Claim
41 words
A composition according to claim 1 in which n is from 65 to 75, the viscosity is substantially above 100 poises and not substantially more than 200 poises at 30* C., and the diisocyanate is from the class of tolylene diisocyanates.
Claim 3
Dependent Claim
36 words
A composition according to claim 1 in which the diisocyanate is from the class of tolylene diisocyanates, the extender oil is from the class of mineral oils lighter than kerosene fractions, naphthenic oils, and paraffin oils.
Claim 4
Dependent Claim
20 words
A composition according to claim 4 including an antioxidant, a silicone base antifoam, and dibutyl tin dilaurate as the accelerator.
Claim 5
Dependent Claim
48 words
A potting composition according to claim 1 in which there are 100 parts by weight of the homopolymeric butadiene, 50 to 70 parts by weight of the extender oil, and about 7 parts by weight of the diisocyanate and 30 to 75 parts by weight of polypropylene powder.
Claim 6
Dependent Claim
45 words
A potting composition according to claim 1 in which there are 100 parts by weight of dihydroxypolybutadiene, 50 parts by weight of an extender oil lighter than kerosene, about 7 parts by weight of tolylene diisocyanate and 30 parts by weight of the polypropylene powder.
Claim 7
Dependent Claim
71 words
A potting composition according to claim 1 in which a solution of 100 parts by weight of homopolymeric butadiene and 10 parts by weight of extender oil having 25 parts by weight of polypropylene powder dispersed therein, is blended with a solution of 7 parts by weight of tolylene diisocyanate in 60 parts of extender oil having 50 parts by weight of polypropylene powder dispersed therein to form the potting composition.
Claim 8
Dependent Claim
12 words
A pourablE potting composition comprising a hydroxyl-terminated homopolymeric butadiene having the formula
Claim 9
Dependent Claim
17 words
A composition according to claim 9 in which n of the polybutadiene is between 65 and 75.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |