JPS5440875A - Production of polyropylene film for electric appliance - Google Patents
Production of polyropylene film for electric applianceInfo
- Publication number
- JPS5440875A JPS5440875A JP10706777A JP10706777A JPS5440875A JP S5440875 A JPS5440875 A JP S5440875A JP 10706777 A JP10706777 A JP 10706777A JP 10706777 A JP10706777 A JP 10706777A JP S5440875 A JPS5440875 A JP S5440875A
- Authority
- JP
- Japan
- Prior art keywords
- traverse
- over
- polypropylene
- longitudinal
- resin composition
- 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
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Abstract
PURPOSE: Unoriented tubular form of polypropylene resin composition is subjected to simultaneous biaxial orientation and then heat treatment under relaxation, thereby producing titled polypropylene film with high oxidation resistance and anisotropy in thermal shrinkage.
CONSTITUTION: A polypropylene resin composition comprising 100 pats by wt of a high-crystallinity polypropyelen resin of 0.5W10 MI, 0.005W0.5 part of at least one anti-oxidant of hindered phenol and 0.005W0.1 part of at least one metal salt of stearic acid is melt extruded from a ring die and rapidly cooled to form an unoriented tubular form. The resulting form is biaxially oriented under such conditions that the both traverse and longitudinal orientation ratios are 6.5 or less and the longitudinal orientation ratio is always lower than the traverse one and then heat treated at a temperature of over 160°C but lower than the melting point of polypropylene under relaxation rates of over 8 and 10% in the longitudinal and traverse directions respectively wherein the ratio of these rates is kept over 1.2.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10706777A JPS5440875A (en) | 1977-09-06 | 1977-09-06 | Production of polyropylene film for electric appliance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10706777A JPS5440875A (en) | 1977-09-06 | 1977-09-06 | Production of polyropylene film for electric appliance |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5440875A true JPS5440875A (en) | 1979-03-31 |
Family
ID=14449639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10706777A Pending JPS5440875A (en) | 1977-09-06 | 1977-09-06 | Production of polyropylene film for electric appliance |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5440875A (en) |
-
1977
- 1977-09-06 JP JP10706777A patent/JPS5440875A/en active Pending
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