Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • 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
  • H01B3/422—Linear saturated polyesters derived from dicarboxylic acids and dihydroxy compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
  • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

• the present invention relates to a flame-retardant, biaxially oriented polyester film.
• Biaxially oriented films made of linear polyesters, in particular made of polyethylene, terephthalate, are widely used in industry. These include especially the areas of application in the electrical sector, e.g. for the production of transformers, wire insulation, as ribbon cable, cable and slot insulation or for the production of capacitors.
• polyester films In the course of increased security, e.g. in radio and television construction or in high-speed engines, it is desirable to bring such polyester films into higher heat classes and to increase their flame resistance.
• polyesters which contain chain links with structural units of the formula P are preferred have, the proportion being in particular 3 to 10 mole percent acid component of the polyester.
• Preferred from the range of polyesters are those made from polyethylene or polybutylene terephthalate.
• the Films according to the invention are preferably heat-set.
• the known slip agents can be used, Si0 2 being preferred.
• an SiO 2 that has been produced by hydrolysis of silicon halides has proven particularly useful.
• the films according to the invention are stretched 2.5 to 4.5 times in the longitudinal and transverse directions, with stretching in the range of 3.5 times being preferred. All common methods of flat and tube stretching for polyester can be used for stretching, including multiple stretching in at least one of the directions or simultaneous stretching.
• the preferred embodiment has a tensile strength of> 200 N / mm 2 .
• the elongation at break should be> 100% in the longitudinal and transverse directions.
• films are required that have low shrinkage at high temperatures.
• preference is given to films whose shrinkage is ⁇ 5% at 150 ° C. (measured in air, 15 minutes).
• preference is given to those foils whose dielectric constant (measured at 150 ° C; 1 kHz) is> 3 and whose specific volume resistance is ⁇ 10 18 x cm (measured at 20 ° C).
• the films according to the invention can in principle be used for all fields of application in which polyester films are used, which should be highly flame-retardant.
• the main area of application is the use as an insulation film, with the electrical and motor sectors occupying a special position.
• the film thicknesses e.g. for capacitor manufacture are usually in the range of -2 to 15pm, e.g. for the slot insulation of electric motors are usually in the range from 50 to 350 ⁇ m, although this range information is not intended to mean any restriction.
• Polyethylene terephthalate the acid component of which is made up of 4.3 mole percent P-containing chain links with the formula were replaced and its SV value was 905, was 0.1 Weight percent SiO 2 added as a slip agent.
• the product was extruded from a slot die at 275 ° C and cooled on a chill roll at a temperature of 28 ° C.
• the cooled pre-film was stretched 3.3 times lengthwise at 85 ° C and then stretched 3.5 times at 90 ° C.
• the biaxially stretched film was heat-set at 200 ° C., maintaining a divergence of 10%.
• the 75 ⁇ m thick film was used as flame-retardant groove insulation in electric motors.
• Example 2 The procedure was analogous to Example 1, except that. Difference that the final film was 6 ⁇ m thick.
• This film was used as a capacitor film after it had been vapor-coated with aluminum.
• This film was used for cable insulation.
• the following table shows the property values of the films with and without "phospholane" content.
• the foils containing "phcspholan are not at all or absolutely inflammable. They do not show any drainer and if they are to be set on fire at all, they extinguish after a short while.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Medicinal Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)
• Organic Insulating Materials (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
• Polyesters Or Polycarbonates (AREA)

Applications Claiming Priority (2)

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Citations (2)

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• 1977
  • 1977-06-10 DE DE19772726189 patent/DE2726189A1/de not_active Withdrawn
• 1978
  • 1978-06-02 JP JP6590178A patent/JPS54126278A/ja active Pending
  • 1978-06-05 EP EP78100087A patent/EP0000047A1/de not_active Ceased
  • 1978-06-07 US US05/913,339 patent/US4169935A/en not_active Expired - Lifetime

Patent Citations (2)

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