Composite film comprising low-dielectric resin and paraoriented aromatic polyamide
First Claim
1. A composite film comprising a continuous phase of para-oriented aromatic polyamide and a phase of low-dielectric resin, said film having a dielectric constant at 1 MHz of not more than 3.2 and a linear thermal expansion coefficient at 200 to 300°
- C. of within ±
50×
10-6 /°
C.,wherein the continuous phase of para-oriented aromatic polyamide comprises fibrils having a diameter of not more than 1 μ
m, and the fibrils are planarly arranged and layered in the form of a network or a non-woven fabric.
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Accused Products
Abstract
Provided is a composite film comprising a continuous phase of para-oriented aromatic polyamide and a phase of low-dielectric resin, said film having a dielectric constant at 1 MHz of not more than 3.2 and a linear thermal expansion coefficient at 200 to 300° C. of within ±50×10-6 /°C. The composite film has characteristics such as a low dielectric constant, favorable mechanical strength, homogeneous structure, light weight, and a low linear thermal expansion coefficient, and the film is useful as a base substrate for a flexible printed circuit board.
20 Citations
16 Claims
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1. A composite film comprising a continuous phase of para-oriented aromatic polyamide and a phase of low-dielectric resin, said film having a dielectric constant at 1 MHz of not more than 3.2 and a linear thermal expansion coefficient at 200 to 300°
- C. of within ±
50×
10-6 /°
C.,wherein the continuous phase of para-oriented aromatic polyamide comprises fibrils having a diameter of not more than 1 μ
m, and the fibrils are planarly arranged and layered in the form of a network or a non-woven fabric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- C. of within ±
Specification