US4237334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated insulating paper and oil-filled cable insulated thereby
Assignee: SWCC Corp
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Filing: 1978-07-31
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Granted: 1980-12-02
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Expires: 1998-07-31
Abstract
Abstract The present invention relates to a laminated insulating paper formed of cellulose paper or papers which is adhered to at least one side of cross-linked silicone grafted polyolefine film and to an oil-filled (OF) cable which insulated by the laminated insulating paper. The laminated insulating paper has outstanding peel strength as well as excellent non-solubility and anti-swelling properties in insulating oils.
Inventors
- 👤 Takeshi Kojima
- 👤 Sakae Kinoshita
- 👤 Kenzo Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:32
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B27/32; H; H01; H01B; H01B7/00; H01B7/02; H01B7/0208; H01B7/0225; H01B9/00; H01B9/06; H01B9/0627; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; B32B2317/00; B32B2317/12; B32B2323/00; B32B2323/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/296; Y10T428/2962; Y10T428/31504; Y10T428/31536; Y10T428/31652; Y10T428/31663; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
123 words
A laminated electrical insulating wrapping material comprising a plastic film of a cross-linked silicone grafted polyolefin and a cellulose paper or papers laminated to at least one side of said film, said laminated insulating material produced by the process comprising: (a) melt-extruding an un-cross-linked silicone grafted polyolefin to form a softened film; (b) superimposing said paper or papers onto one side of said softened film; (c) applying pressure to said superimposed paper and softened film to form a laminate; and (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of a silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl groups of said cellulose paper.
Claim 2
Dependent Claim
123 words
A laminated electrical insulating wrapping material comprising a plastic film of a cross-linked silicone grafted polyolefin and a cellulose paper or papers laminated to at least one side of said film, said laminated insulating material produced by the process comprising: (a) melt-extruding an un-cross-linked silicone grafted polyolefin to form a softened film; (b) superimposing said paper or papers onto one side of said softened film; (c) applying pressure to said superimposed paper and softened film to form a laminate; and (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of a silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl groups of said cellulose paper.
Claim 3
Dependent Claim
17 words
The laminated insulating paper according to claim 1, wherein the silicone grafted polyolefin is silicone grafted polyethylene.
Claim 4
Dependent Claim
30 words
The laminated insulating paper according to claim 1, wherein the plastic film has a thickness of approximately 40-120μ and the cellulose paper or papers has a thickness of approximately 10-70μ.
Claim 5
Dependent Claim
94 words
A process for producing a laminated electrical insulating material comprising: (a) melt-extruding an un-cross-linked silicone grafted polyolefin to form a softened film; (b) superimposing a cellulose paper or papers onto one side of said softened film; (c) applying pressure to said superimposed paper and softened film to form a laminate; and (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of a silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl groups of said cellulose paper.
Claim 6
Dependent Claim
94 words
A process for producing a laminated electrical insulating material comprising: (a) melt-extruding an un-cross-linked silicone grafted polyolefin to form a softened film; (b) superimposing a cellulose paper or papers onto one side of said softened film; (c) applying pressure to said superimposed paper and softened film to form a laminate; and (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of a silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl groups of said cellulose paper.
Claim 7
Dependent Claim
137 words
A process for producing a laminated insulating paper which includes cellulose paper or papers laminated to at least one side of a plastic film, the process comprising the steps of: (a) extruding a mixture of un-cross-linked silicone grafted polyolefin pellets with master batch pellets of a silanol condensation catalyst to form a silicone grafted polyolefin film; (b) superimposing cellulose paper or papers on at least one side of said film; (c) applying pressure to laminate cellulose paper or papers and said superimposed extruded film while said film is still in a softened state; and (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of said silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl groups of said cellulose paper.
Claim 8
Dependent Claim
137 words
A process for producing a laminated insulating paper which includes cellulose paper or papers laminated to at least one side of a plastic film, the process comprising the steps of: (a) extruding a mixture of un-cross-linked silicone grafted polyolefin pellets with master batch pellets of a silanol condensation catalyst to form a silicone grafted polyolefin film; (b) superimposing cellulose paper or papers on at least one side of said film; (c) applying pressure to laminate cellulose paper or papers and said superimposed extruded film while said film is still in a softened state; and (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of said silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl groups of said cellulose paper.
Claim 9
Dependent Claim
149 words
A process for producing a laminated insulating paper which includes cellulose paper or papers laminated to at least one side of a plastic film, the process comprising the steps of: (a) extruding un-cross-linked silicone grafted polyolefin from an extruder to form a silicone grafted polyolefin film; (b) superimposing cellulose paper or papers on at least one side of said film; (c) applying pressure to laminate said superimposed cellulose paper or papers and extruded film while said film is still in a softened state; (d) cross-linking said silicone grafted polyolefin film of the laminate by reaction with water in the presence of a silanol condenation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl group of said cellulose paper; and (e) heat-treating the laminated film at a temperature of 40°-150° C. for a period of 30 minutes to 50 hours.
Claim 10
Dependent Claim
149 words
A process for producing a laminated insulating paper which includes cellulose paper or papers laminated to at least one side of a plastic film, the process comprising the steps of: (a) extruding un-cross-linked silicone grafted polyolefin from an extruder to form a silicone grafted polyolefin film; (b) superimposing cellulose paper or papers on at least one side of said film; (c) applying pressure to laminate said superimposed cellulose paper or papers and extruded film while said film is still in a softened state; (d) cross-linking said silicone grafted polyolefin film of the laminate by reaction with water in the presence of a silanol condenation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl group of said cellulose paper; and (e) heat-treating the laminated film at a temperature of 40°-150° C. for a period of 30 minutes to 50 hours.
Claim 11
Dependent Claim
24 words
A process for producing a laminated insulating paper according to claim 6, wherein the heat-treatment is carried out at a temperature of 80°-110° C.
Claim 12
Dependent Claim
159 words
In an oil-filled electrical cable comprising an electric conductor, an insulating layer of wound laminated insulating paper applied over the electric conductor, an insulating oil impregnated in the insulating layer, and a metal sheath applied over the insulating layer, the improvement wherein: the laminated insulating paper comprises a plastic film formed of a cross-linked silicone grafted polyolefin film and cellulosic paper or papers laminated to at least one side thereof and produced by the process comprising, (a) melt-extruding an un-cross-linked silicone grafted polyolefin to form a softened film; (b) superimposing said paper or papers onto one side of said softened film; (c) applying pressure to said superimposed paper and softened film to form a laminate; and (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of a silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl groups of said cellulose paper.
Claim 13
Dependent Claim
159 words
In an oil-filled electrical cable comprising an electric conductor, an insulating layer of wound laminated insulating paper applied over the electric conductor, an insulating oil impregnated in the insulating layer, and a metal sheath applied over the insulating layer, the improvement wherein: the laminated insulating paper comprises a plastic film formed of a cross-linked silicone grafted polyolefin film and cellulosic paper or papers laminated to at least one side thereof and produced by the process comprising, (a) melt-extruding an un-cross-linked silicone grafted polyolefin to form a softened film; (b) superimposing said paper or papers onto one side of said softened film; (c) applying pressure to said superimposed paper and softened film to form a laminate; and (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of a silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl groups of said cellulose paper.
Claim 14
Dependent Claim
16 words
The oil-filled cable according to claim 8, wherein the silicone grafted polyolefin is silicone grafted polyethylene.
Claim 15
Dependent Claim
29 words
The oil-filled cable according to claim 8, wherein the plastic film has a thickness of approximately 40-120μ and the cellulose paper or papers has a thickness of approximately 10-70μ.
Claim 16
Dependent Claim
15 words
The oil-filled cable according to claim 8, wherein said insulating oil is a diaryl alkane.
Claim 17
Dependent Claim
143 words
A laminated electrical insulating wrapping material comprising a plastic film of a cross-linked silicone grafted polyolefin and a cellulose paper or papers laminated to at least one side of said film, said laminated insulating material produced by the process comprising: (a) melt-extruding an un-cross-linked silicone grafted polyolefin to form a softened film; (b) superimposing said paper or papers onto one side of said softened film; (c) applying pressure to said superimposed paper and softened film to form a laminate; (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of a silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl group of said cellulose paper; and (e) heat-treating the laminated film at a temperature of 40°-150° C. for a period of 30 minutes to 50 hours.
Claim 18
Dependent Claim
143 words
A laminated electrical insulating wrapping material comprising a plastic film of a cross-linked silicone grafted polyolefin and a cellulose paper or papers laminated to at least one side of said film, said laminated insulating material produced by the process comprising: (a) melt-extruding an un-cross-linked silicone grafted polyolefin to form a softened film; (b) superimposing said paper or papers onto one side of said softened film; (c) applying pressure to said superimposed paper and softened film to form a laminate; (d) cross-linking said laminated silicone grafted polyolefin film by reaction with water in the presence of a silanol condensation catalyst and forming a chemical bond between the silyl groups of said silicone grafted polyolefin film and the hydroxyl group of said cellulose paper; and (e) heat-treating the laminated film at a temperature of 40°-150° C. for a period of 30 minutes to 50 hours.
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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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |