GB669127A - Improvements in or relating to insulated electrical conductors - Google Patents
Improvements in or relating to insulated electrical conductorsInfo
- Publication number
- GB669127A GB669127A GB2103249A GB2103249A GB669127A GB 669127 A GB669127 A GB 669127A GB 2103249 A GB2103249 A GB 2103249A GB 2103249 A GB2103249 A GB 2103249A GB 669127 A GB669127 A GB 669127A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parts
- heat
- acid catalyst
- phenol
- formalin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/446—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylacetals
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
- Paints Or Removers (AREA)
Abstract
An insulating composition comprises in solution in a volatile solvent a polyvinyl acetal resin, preferably polyvinyl formal, and a non-heat-hardenable resin made by condensing phenol or a methyl derivative thereof with formaldehyde in the presence of an acid catalyst. The ratio of polyvinyl to phenolic resin is preferably from 4 : 1 to 2 : 1 and the volatile solvent may be a mixture of cresol, methyl naphthalene and heavy naphtha. In examples, non-heat-hardenable resins are made from (a) 188 parts phenol, 75 parts 40 per cent formalin and 4.7 parts phosphoric acid catalyst, or (b) from 436 parts cresol, 162 parts 40 per cent formalin and 10.8 parts phosphoric acid catalyst by heating under reflux for two hours at 90 DEG C. and then heating at 110 DEG C without the reflux condenser until the mixture becomes clear. The preparation of a heat-hardenable resin from 188 parts phenol, 300 parts 40 percent formalin and 6 parts 0.880 ammonia catalyst is also described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2103249A GB669127A (en) | 1949-08-12 | 1949-08-12 | Improvements in or relating to insulated electrical conductors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2103249A GB669127A (en) | 1949-08-12 | 1949-08-12 | Improvements in or relating to insulated electrical conductors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB669127A true GB669127A (en) | 1952-03-26 |
Family
ID=10156023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2103249A Expired GB669127A (en) | 1949-08-12 | 1949-08-12 | Improvements in or relating to insulated electrical conductors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB669127A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1026387B (en) * | 1953-08-26 | 1958-03-20 | Gen Electric | Insulated electrical conductor, the outer insulation of which consists of a heat-treated synthetic resin |
| DE1036962B (en) * | 1954-10-29 | 1958-08-21 | Gen Electric | Process for the production of an insulated electrical conductor resistant to difluorochloromethane |
-
1949
- 1949-08-12 GB GB2103249A patent/GB669127A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1026387B (en) * | 1953-08-26 | 1958-03-20 | Gen Electric | Insulated electrical conductor, the outer insulation of which consists of a heat-treated synthetic resin |
| DE1036962B (en) * | 1954-10-29 | 1958-08-21 | Gen Electric | Process for the production of an insulated electrical conductor resistant to difluorochloromethane |
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