FLEXIBLE METAL LAMINATE CONTAINING FLUOROPOLYMER
First Claim
1. A flexible metal laminate comprisinga first metal layer;
- a first polyimide layer;
a polyimide layer including fluoropolymer dispersed therein, formed on the first polyimide layer; and
a second polyimide layer formed on the polyimide layer including fluoropolymer dispersed therein;
wherein in the polyimide layer including dispersed fluoropolymer, the content of the fluoropolymer per unit volume is higher at 40 to 60% depth than at 5 to 10% depth of the total thickness from the surface of the polyimide layer.
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Accused Products
Abstract
The present invention relates to a flexible metal laminate with low dielectric constant, which may be applied for a substrate for a flexible printed circuit. A flexible metal laminate according to one aspect of the invention includes a first metal layer; a first polyimide layer; a polyimide layer including fluoropolymer dispersed therein, formed on the first polyimide layer; and a second polyimide layer formed on the polyimide layer including fluoropolymer dispersed therein; wherein in the polyimider layer including dispersed fluoropolymer, the content of the fluoropolymer per unit volume is higher at 40 to 60% depth than at 5 to 10% depth of the total thickness from the surface of the polyimide layer.
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Citations
26 Claims
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1. A flexible metal laminate comprising
a first metal layer; -
a first polyimide layer; a polyimide layer including fluoropolymer dispersed therein, formed on the first polyimide layer; and a second polyimide layer formed on the polyimide layer including fluoropolymer dispersed therein; wherein in the polyimide layer including dispersed fluoropolymer, the content of the fluoropolymer per unit volume is higher at 40 to 60% depth than at 5 to 10% depth of the total thickness from the surface of the polyimide layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for manufacturing a flexible metal laminate comprising:
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coating a first polyamic acid varnish on a first metal layer; coating polyamic acid varnish including fluoropolymer powder dispersed therein on the first polyamic acid varnish; and coating a second polyamic acid varnish on the polyamic acid varnish including fluoropolymer powder dispersed therein, drying and curing it. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification