DE1218570B - Process for increasing the dielectric strength of stretched insulating films made of polycarbonate - Google Patents
Process for increasing the dielectric strength of stretched insulating films made of polycarbonateInfo
- Publication number
- DE1218570B DE1218570B DES70472A DES0070472A DE1218570B DE 1218570 B DE1218570 B DE 1218570B DE S70472 A DES70472 A DE S70472A DE S0070472 A DES0070472 A DE S0070472A DE 1218570 B DE1218570 B DE 1218570B
- Authority
- DE
- Germany
- Prior art keywords
- polycarbonate
- increasing
- dielectric strength
- stretched
- insulating films
- 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.)
- Pending
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
- H01B3/42—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 polyesters; polyethers; polyacetals
- H01B3/421—Polyesters
- H01B3/426—Polycarbonates
Description
Verfahren zur Erhöhung der Durchschlagsfestigkeit von gereckten Isolierstoffolien aus Polykarbonat Die Erfindung betrifft ein Verfahren zur Erhöhung der Durchschlagsfestigkeit von gereckten Isolierstoffbändern aus Polykarbonat, vorzugsweise zur Verwendung als Dielektrikum für elektrische Kondensatoren.Process for increasing the dielectric strength of stretched insulating films made of polycarbonate The invention relates to a method for increasing the dielectric strength of stretched insulating tape made of polycarbonate, preferably for use as a dielectric for electrical capacitors.
Die Entwicklung der elektrischen Bauelemente geht in zunehmenden Maße auf eine Verkleinerung der äußeren Abmessungen der Bauelemente hin. Um bei elektrischen Kondensatoren bei vorgegebenen Kapazitäts- und Betriebsspannungswerten zu möglichst kleinen Abmessungen zu gelangen, ist man bestrebt, als Dielektrikum möglichst dünne Folien zu verwenden, die aber trotzdem eine hohe Durchschlagsfestigkeit besitzen.The development of electrical components is increasing towards a reduction in the external dimensions of the components. To with electrical Capacitors at specified capacitance and operating voltage values as much as possible To achieve small dimensions, the aim is to make the dielectric as thin as possible To use foils, which nevertheless have a high dielectric strength.
Die bereits bekannten Polykarbonatfolien weisen zwar in anderer Hinsicht sehr günstige Eigenschaften auf, wie z. B. eine sehr hohe Wärmebeständigkeit, eine relativ hohe Dielektrizitätskonstante u. dgl. Ihre Durchschlagsfestigkeit liegt jedoch mit etwa 100 KV/mm unterhalb der Werte von anderen Kunststoffolien, wie z. B. Polyäthylenterephthalat.The already known polycarbonate films have very favorable properties in other respects, such as, for. B. a very high heat resistance, a relatively high dielectric constant u. The like. However, their dielectric strength is about 100 KV / mm below the values of other plastic films, such. B. polyethylene terephthalate.
Es ist auch bekannt, die mechanische Festigkeit von Polykarbonatfolien durch eine Streckung um bis zu 200% zu erhöhen. In ähnlicher Weise ist es bekannt, daß durch beidachsige Verstreckung von Polyäthylenterephthalatfolien auf das 2,5- bis 3,45fache ihrer Länge optimale mechanische Eigenschaften erzielt werden können.It is also known to increase the mechanical strength of polycarbonate films by stretching them by up to 200%. Similarly, it is known that by stretching polyethylene terephthalate films in two axes to 2.5 to 3.45 times their length, optimum mechanical properties can be achieved.
überraschenderweise wurde nun festgestellt, daß durch Verstreckung von Polykarbonatfolien in stärkerer Weise, als das bisher zur Verbesserung der mechanischen Eigenschaften bekannt war, die elektrische Spannungsfestigkeit erheblich erhöht werden kann.Surprisingly, it has now been found that by stretching of polycarbonate films in a stronger way than before to improve the mechanical Properties was known, the electrical strength significantly increased can be.
Es wird daher vorgeschlagen, die Durchschlagsfestigkeit der Polykarbonatfolien dadurch zu erhöhen, daß erfindungsgemäß die Polykarbonatbänder in Längsrichtung mindestens auf das Dreifache der ursprünglichen Länge gestreckt werden.It is therefore suggested that the dielectric strength of the polycarbonate films to increase by the fact that according to the invention the polycarbonate strips in the longitudinal direction stretched to at least three times the original length.
Beispielsweise konnte die Spannungsfestigkeit einer Folie durch Recken derart gesteigert werden, daß diese von ihrem Ausgangspunkt in ungerecktem Zustand, bei dem sie etwa 140 KV/mm betrug, nach einer Reckung, bei der die ursprüngliche Stärke der Folie von 20 K auf 8 #t zurückging, 200 KV/mni betrug und nach einer Reckung auf eine Stärke von 5 li 280 KV/mm erreichte. Es ergibt sich aber bereits aus diesen Werten, daß erst dann eine merkbare Erhöhung der Durchschlagsfestigkeit zu beobachten ist, wenn relativ hohe Reckungsgrade angewendet werden. Als untere Grenze ist etwa eine Reckung von 300% angegeben, d. h. eine solche, bei der die Polykarbonatbänder auf das Dreifache der ursprünglichen Länge gestreckt werden.For example, the tensile strength of a film could be increased by stretching in such a way that it went from its starting point in the unstretched state, where it was about 140 KV / mm, after a stretching in which the original thickness of the film decreased from 20 K to 8 #t , 200 KV / mni and reached after stretching to a thickness of 5 li 280 KV / mm. However, it can already be seen from these values that a noticeable increase in the dielectric strength can only be observed when relatively high degrees of stretching are used. A stretching of approximately 300% is specified as the lower limit, ie one in which the polycarbonate tapes are stretched to three times the original length.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES70472A DE1218570B (en) | 1960-09-22 | 1960-09-22 | Process for increasing the dielectric strength of stretched insulating films made of polycarbonate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES70472A DE1218570B (en) | 1960-09-22 | 1960-09-22 | Process for increasing the dielectric strength of stretched insulating films made of polycarbonate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1218570B true DE1218570B (en) | 1966-06-08 |
Family
ID=7501753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES70472A Pending DE1218570B (en) | 1960-09-22 | 1960-09-22 | Process for increasing the dielectric strength of stretched insulating films made of polycarbonate |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1218570B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0245691A2 (en) * | 1986-05-10 | 1987-11-19 | Bayer Ag | Use of polycondensate films |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1004252B (en) * | 1952-05-12 | 1957-03-14 | Du Pont | Polyethylene terephthalate film insulation for electrical devices |
| DE962274C (en) * | 1954-07-02 | 1957-04-18 | Bayer Ag | Use of high molecular weight polycarbonates as electrical insulating materials |
-
1960
- 1960-09-22 DE DES70472A patent/DE1218570B/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1004252B (en) * | 1952-05-12 | 1957-03-14 | Du Pont | Polyethylene terephthalate film insulation for electrical devices |
| DE962274C (en) * | 1954-07-02 | 1957-04-18 | Bayer Ag | Use of high molecular weight polycarbonates as electrical insulating materials |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0245691A2 (en) * | 1986-05-10 | 1987-11-19 | Bayer Ag | Use of polycondensate films |
| EP0245691A3 (en) * | 1986-05-10 | 1990-08-16 | Bayer Ag | Use of polycondensate films |
| US5037220A (en) * | 1986-05-10 | 1991-08-06 | Bayer Aktiengesellschaft | Printing ribbon comprising polycondensates |
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