# US 9,521,759 B2 · Vertical conductive unit and manufacturing method thereof

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- Number: US 9,521,759 B2
- Document ID: US9521759B2
- Status: Granted
- Kind: B2
- Application number: 14/279,774
- Filed: 2014-05-16
- Published: 2014-11-20
- Granted: 2016-12-13
- Earliest claimed: 2013-05-17
- Assignees: Microcosm Technology Co., Ltd.
- Applicants: Microcosm Technology Co., Ltd.
- Inventors: Tang-Chieh Huang
- Web page: https://patentgrep.com/patent/US9521759B2

## CPC

- H05K 3/4644: {by building the multilayer layer by layer, i.e. build-up multilayer circuits (making via holes in the insulating layers H05K3/0011; special circuit boards as base or core whereon the multilayer is built H05K3/4602)}
- C08G 73/1042: {Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds}
- C08G 73/106: {containing silicon}
- C08G 73/1075: {Partially aromatic polyimides}
- C09D 179/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- H05K 3/4676: {Single layer compositions}
- H05K 2201/0154: Polyimide
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

The invention provides a vertical conductive unit. The vertical conductive unit comprises an insulating layer comprising a connecting via, a first conductor, a second conductor, and a third conductor. The insulating layer comprises photosensitive polyimide, and the glass transition temperature of the photosensitive polyimide is lower than about 200° C. The invention also provides a method for manufacturing the vertical conductive unit.

## Claims

### Claim 1

A vertical conductive unit, which comprises:
an insulating layer comprising an upper surface and a lower surface, and the insulating layer comprising a connecting via running through the insulating layer;
a first conductor contacting the lower surface of the insulating layer;
a second conductor contacting the upper surface of the insulating layer; and
a third conductor located in the connecting via and contacting the first conductor and the second conductor;
wherein the insulating layer comprises photosensitive polyimide, and a glass transition temperature of the photosensitive polyimide is lower than about 200° C. and
wherein the photosensitive polyimide is copolymerized by a unit represented by formula (1) and a unit represented by formula (2),
wherein:
R1 is selected from the group consisting of formulae (3) to (8);
R2 is selected from the group consisting of formulae (9) to (14);
R* represents
R3 represents and
x represents an integer from 1 to 20.

### Claim 2 (depends on 1)

The vertical conductive unit according to claim 1, which further comprises:
a second insulating layer comprising an upper surface and a lower surface, and the second insulating layer comprising a second connecting via running through the second insulating layer, and the lower surface of the second insulating layer contacting the second conductor;
a fourth conductor contacting the upper surface of the second insulating layer; and
a fifth conductor located in the second connecting via and contacting the second conductor and the fourth conductor.

### Claim 3 (depends on 1)

The vertical conductive unit according to claim 1, wherein the photosensitive polyimide further comprises a photoinitiator and a photocrosslinking agent.

### Claim 4 (depends on 1)

The vertical conductive unit according to claim 1, wherein the first conductor, second conductor or third conductor is selected from the group consisting of a conductive block, a conductive wire, a conductive sheet, an element having an electricity-conducting function, and a line module having an electricity-conducting function.

### Claim 5 (depends on 1)

The vertical conductive unit according to claim 1, wherein the insulating layer comprises a first insulating layer and a second insulating layer; wherein the first insulating layer comprises the photosensitive polyimide, and the second insulating layer comprises an alkali-soluble polyimide.

### Claim 6 (depends on 1)

The vertical conductive unit according to claim 1, wherein the insulating layer further comprises an empty via running through the insulating layer.

### Claim 7

A vertical conductive unit, which comprises:
an insulating layer comprising an upper surface and a lower surface, and the insulating layer comprising a connecting via running through the insulating layer;
a first conductor contacting the lower surface of the insulating layer;
a second conductor contacting the upper surface of the insulating layer; and
a third conductor located in the connecting via and contacting the first conductor and the second conductor;
wherein the insulating layer comprises photosensitive polyimide, and a glass transition temperature of the photosensitive polyimide is lower than about 200° C., and
wherein the photosensitive polyimide is copolymerized by a unit represented by formula (15),
wherein:
R4 represents
and
R5 is selected from the group consisting of formulae (16) to (22);

### Claim 8 (depends on 7)

The vertical conductive unit according to claim 7, which further comprises:
a second insulating layer comprising an upper surface and a lower surface, and the second insulating layer comprising a second connecting via running through the second insulating layer, and the lower surface of the second insulating layer contacting the second conductor;
a fourth conductor contacting the upper surface of the second insulating layer; and
a fifth conductor located in the second connecting via and contacting the second conductor and the fourth conductor.

### Claim 9 (depends on 7)

The vertical conductive unit according to claim 7, wherein the photosensitive polyimide further comprises a photoacid generator and a photocrosslinking agent.

### Claim 10 (depends on 7)

The vertical conductive unit according to claim 7, wherein the first conductor, second conductor or third conductor is selected from the group consisting of a conductive block, a conductive wire, a conductive sheet, an element having an electricity-conducting function, and a line module having an electricity-conducting function.

### Claim 11 (depends on 7)

The vertical conductive unit according to claim 7, wherein the insulating layer comprises a first insulating layer and a second insulating layer; wherein the first insulating layer comprises the photosensitive polyimide, and the second insulating layer comprises an alkali-soluble polyimide.

### Claim 12 (depends on 7)

The vertical conductive unit according to claim 7, wherein the insulating layer further comprises an empty via running through the insulating layer.