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Method of making liquid crystal polymer films

A technology of liquid crystal polymers and manufacturing methods, applied in liquid crystal materials, printed circuit manufacturing, chemical instruments and methods, etc., capable of solving problems such as positional deviation

Active Publication Date: 2005-05-18
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When mounting objects such as semiconductor elements or impedance elements directly on the surface of the circuit board, if the thermal expansion coefficient of the circuit board and the thermal expansion coefficient of the mounting object are different, there is a problem that positional displacement is likely to occur

Method used

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  • Method of making liquid crystal polymer films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Use the thermoplastic liquid crystal polymer film that obtains in the reference example and the aluminum foil of thickness 50 μ m (thermal expansion coefficient (S) is 23 * 10 -6 cm / cm / °C) as a support. A heat-resistant rubber roll (hardness 90 degrees, JISA) and a heated metal roll are installed in a continuous hot roll extrusion device, and the thermoplastic liquid crystal polymer film is supplied between the rolls by contacting the heat-resistant rubber roll surface and the aluminum foil is in contact with the heated metal roll surface, 10kg / cm in 260℃ heating state 2 Pressure bonding was performed, and a laminate composed of a thermoplastic liquid crystal polymer film / aluminum foil was produced at a speed of 3 m / min. At this time, a tension of 3 kg / 40 cm width was applied to the thermoplastic liquid crystal polymer film. A part of the obtained laminate was sampled, the aluminum foil and the film were peeled off, and the result of measuring the coefficient of therm...

Embodiment 2

[0081] Using the thermoplastic liquid crystal polymer film obtained in the reference example and a titanium foil with a thickness of 30 μm (the coefficient of thermal expansion (S) is 9×10 -6 cm / cm / °C) as a support. A heat-resistant rubber roll (hardness 90 degrees, JISA) and a heated metal roll are installed in a continuous hot roll extrusion device, and the thermoplastic liquid crystal polymer film is brought into contact with the heat-resistant rubber roll surface and titanium foil is supplied between the rolls by contacting the heat-resistant metal roll surface , heated at 260°C at 10kg / cm 2 Pressure bonding was performed, and a laminate composed of a thermoplastic liquid crystal polymer film / titanium foil was produced at a speed of 3 m / min. At this time, a tension of 3 kg / 40 cm width was applied to the thermoplastic liquid crystal polymer film. A part of the obtained laminate was sampled, the titanium foil and the film were peeled off, and the result of measuring the th...

Embodiment 3

[0085] Using the thermoplastic liquid crystal polymer film obtained in the reference example and copper foil with a thickness of 18 μm (the coefficient of thermal expansion (S) is 18×10 -6 cm / cm / °C) as a support. A heat-resistant rubber roll (hardness 90 degrees, JISA) and a heated metal roll are installed in a continuous heat-roll extrusion device, and the thermoplastic liquid crystal polymer film contacts the surface of the heat-resistant rubber roll and the copper foil contacts the surface of the heated metal roll to supply between the rolls , heated at 260°C at 10kg / cm 2 Pressure bonding was performed, and a laminate composed of a thermoplastic liquid crystal polymer film / copper foil was produced at a speed of 3 m / min. At this time, a tension of 3 kg / 40 cm width was applied to the thermoplastic liquid crystal polymer film. A part of the obtained laminate was sampled, the copper foil and the film were peeled off, and the result of measuring the coefficient of thermal expa...

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Abstract

The present invention provides a method for advantageously industrially producing a thermoplastic liquid crystal polymer film with a controlled thermal expansion coefficient at a low temperature as an insulating material for a flexible circuit board or a multilayer circuit board. The method is to carry out continuous heat treatment on the thermoplastic liquid crystal polymer film (2) in the state of joining with the thin plate support (4), and then separate the thermoplastic liquid crystal polymer film (2) from the support body (4). A method for producing a polymer film, when heat-treating the thermoplastic liquid crystal polymer film (2) in the state bonded to the support (4), it is carried out at a temperature ranging from the melting point (Tm) of the thermoplastic liquid crystal polymer film (Tm) to 15°C to the melting point (Tm). 5-60 seconds, the thermal expansion coefficient of the thermoplastic liquid crystal polymer is greater than the thermal expansion coefficient before heat treatment.

Description

technical field [0001] The present invention relates to a continuous production method of a film (hereinafter referred to as thermoplastic liquid crystal polymer film) composed of a thermoplastic polymer capable of forming an optically anisotropic molten phase (hereinafter referred to as thermoplastic liquid crystal polymer). Background technique [0002] Thermoplastic liquid crystal polymers have excellent low moisture absorption, heat resistance, chemical resistance, and electrical properties, and their commercialization as electrical insulating materials for printed wiring boards and the like is rapidly advancing. In recent years, in the field of electrical and electronic equipment, SMT (Surface Mount Technology) has become popular and is used in many electrical and electronic equipment products. As a result, the mounting density of electronic circuit boards has been dramatically improved, achieving a reduction in weight, thickness, and miniaturization that was previously...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C71/02B29L7/00H05K1/00H05K3/00
CPCB29C71/02B29K2105/0079B29L2007/008H05K1/0393H05K3/0011H05K2201/0141H05K2201/068H05K2203/0152H05K2203/1105
Inventor 小野寺稔砂本辰也
Owner KURARAY CO LTD
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