Patent US4374892A successfully refreshed from Google Patents.
US4374892A
Expired / Lapsed
US
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Moisture resistant insulating mica tape comprising a monoalkoxy titanate
Assignee: US SAMICA Inc
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Filing: 1981-06-03
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Granted: 1983-02-22
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Expires: 2001-06-03
Abstract
Abstract An electrical insulation tape is disclosed comprising a sheet of mica paper impregnated with a B-staged polybutadiene polymer, a woven glass scrim next to the mica paper, a block copolymer sealing layer next to the glass scrim and optionally a polymeric sealing layer next to the mica. It has been found that the inclusion of about 0.1% to about 0.35% by weight of an organo titanate containing long saturated chains or reactive functional groups impregnated into the mica not only improves the moisture resistance of the tape, and therefore its useful life, but improves the dissipation factor as well.
Inventors
- 👤 Jonathan W. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:59
CPC Classifications
B; B32; B32B; B32B19/00; B32B19/06; C; C04; C04B; C04B24/00; C04B24/40; C04B30/00; H; H01; H01B; H01B3/00; H01B3/02; H01B3/04; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/44; B32B2262/00; B32B2262/02; B32B2262/0276; B32B2262/0284; B32B2315/00; B32B2315/10; B32B2367/00; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/31504; Y10T428/31551; Y10T428/31645; Y10T428/31786; Y10T428/31855; Y10T428/31931; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/155
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
An electrical insulation tape comprising a sheet of mica paper impregnated with a B-staged polybutadiene polymer, a woven glass scrim next to the mica paper, a block copolymer sealing layer next to the glass scrim, and a polyethyleneterephthalate sealing layer next to the mica, wherein the improvement comprises: including about 0.1% to about 0.35% by weight based on the weight of mica present of a monoalkoxy titanate in the mica sheet to improve moisture resistance and dissipation factor.
Claim 2
Dependent Claim
78 words
An electrical insulation tape comprising a sheet of mica paper impregnated with a B-staged polybutadiene polymer, a woven glass scrim next to the mica paper, a block copolymer sealing layer next to the glass scrim, and a polyethyleneterephthalate sealing layer next to the mica, wherein the improvement comprises: including about 0.1% to about 0.35% by weight based on the weight of mica present of a monoalkoxy titanate in the mica sheet to improve moisture resistance and dissipation factor.
Claim 3
Dependent Claim
14 words
The electrical insulation tape of claim 1 including multiple plies of the recited layers.
Claim 4
Dependent Claim
80 words
An electrical insulation tape comprising a sheet of mica paper impregnated with a mixture of B-stage polybutadiene polymer and about 0.1% to about 0.35% by weight based on the weight of mica present of a monoalkoxy titanate, a woven glass scrim next to the mica paper, a block copolymer sealing layer next to the glass scrim, a non-woven polyester mat next to the mica, and a layer of mica dust on that side of the polyester opposite the mica paper.
Claim 5
Dependent Claim
80 words
An electrical insulation tape comprising a sheet of mica paper impregnated with a mixture of B-stage polybutadiene polymer and about 0.1% to about 0.35% by weight based on the weight of mica present of a monoalkoxy titanate, a woven glass scrim next to the mica paper, a block copolymer sealing layer next to the glass scrim, a non-woven polyester mat next to the mica, and a layer of mica dust on that side of the polyester opposite the mica paper.
Claim 6
Dependent Claim
77 words
An electrical insulation tape comprising a sheet of mica paper impregnated with a mixture of B-staged polybutadiene polymer and about 0.1% to about 0.35% by weight based on the weight of mica present of a monoalkoxy titanate, a woven glass scrim next to the mica paper, a block copolymer sealing layer next to the glass scrim, and a layer of release paper next to the mica paper on that side of the tape opposite the glass scrim.
Claim 7
Dependent Claim
77 words
An electrical insulation tape comprising a sheet of mica paper impregnated with a mixture of B-staged polybutadiene polymer and about 0.1% to about 0.35% by weight based on the weight of mica present of a monoalkoxy titanate, a woven glass scrim next to the mica paper, a block copolymer sealing layer next to the glass scrim, and a layer of release paper next to the mica paper on that side of the tape opposite the glass scrim.
Claim 8
Dependent Claim
21 words
The electrical insulation tape of claim 4 including a layer of mica dust between the release paper and the mica paper.
Claim 9
Dependent Claim
21 words
The electrical insulation tape of claims 1, 3 or 4 wherein the titanate is isopropyl-trimethacryl titanate, isopropyl-tri(dioctylpyrophosphato) titanate, or mixtures thereof.
Claim 10
Dependent Claim
28 words
The electrical insulation tape of claims 1, 3 or 4 wherein the titanate is a mixture of 50% by weight isopropyl-trimethacryl titanate, and 50% by weight isopropyl-tri(dioctylpyrophosphato) titanate.
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) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |