Patterned conductive article

Patent metadata

Field	Value
Publication number	US-12048092-B2
Application number	US-202017602886-A
Country	US
Kind code	B2
Filing date	May 5, 2020
Priority date	May 6, 2019
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A patterned conductive article 200 includes a substrate 210 including a unitary layer 210 - 1 and includes a micropattern of conductive traces 220 embedded at least partially in the unitary layer. Each conductive trace extends along a longitudinal direction (y-direction) of the conductive trace and includes a conductive seed layer 230 having a top major surface 232 and an opposite bottom major surface 234 in direct contact with the unitary layer; and a unitary conductive body 240 disposed on the top major surface of the conductive seed layer. The unitary conductive body and the conductive seed layer differ in at least one of composition or crystal morphology. The unitary conductive body has lateral sidewalls 242, 244 and at least a majority of a total area of the lateral sidewalls is in direct contact with the unitary layer.

First claim

The invention claimed is:

1. A patterned conductive article comprising:
a substrate comprising a unitary layer; and
a micropattern of conductive traces embedded at least partially in the unitary layer, each conductive trace extending along a longitudinal direction of the conductive trace and comprising:
a conductive seed layer having a top major surface and an opposite bottom major surface in direct contact with the unitary layer, the conductive seed layer comprising a monolithic metal layer; and
a unitary conductive body disposed on the top major surface of the conductive seed layer, the unitary conductive body and the monolithic metal layer differing in at least one of composition or crystal morphology, the unitary conductive body having lateral sidewalls, at least a majority of a total area of the lateral sidewalls being in direct contact with the unitary layer,
wherein the micropattern of conductive traces has an open area fraction in a range of 80% to 99.95%.

2. The patterned conductive article of claim 1 , wherein the micropattern of conductive traces has an open area fraction in a range of 90% to 99.9%.

3. The patterned conductive article of claim 1 , wherein each conductive trace in at least a majority of the conductive traces in the micropattern has a width W along a width direction orthogonal to the longitudinal direction and to a thickness direction of the unitary layer, and has a thickness T along the thickness direction, T/W being at least 0.8.

4. The patterned conductive article of claim 1 , wherein the micropattern of conductive traces is disposed at least partially in a micropattern of grooves, the micropattern of grooves comprising at least one groove substantially filled with a non-conductive material.

5. The patterned conductive article of claim 1 , wherein the conductive seed layer comprises a cured conductive ink or a cured conductive coating.

6. The patterned conductive article of claim 1 , wherein the conductive seed layer comprises a crosslinked polymer layer comprising the bottom major surface of the conductive seed layer, the monolithic metal layer disposed on the crosslinked polymer layer and comprising the top major surface of the conductive seed layer.

7. The patterned conductive article of claim 1 being at least one of an antenna, a heater, an electromagnetic interference shield, an electrostatic dissipation component, a sensor, or an electrode.

8. A patterned conductive article comprising:
a substrate comprising a first groove therein, the first groove extending along a longitudinal direction and having a bottom surface and side surfaces;
a conductive seed layer disposed in the first groove, the conductive seed layer comprising a monolithic metal layer covering at least a majority of the bottom surface of the first groove; and
a unitary conductive body disposed at least partially in the first groove,
wherein in at least one cross-section of the first groove perpendicular to the longitudinal direction, the conductive seed layer covers at least a majority of the bottom surface of the first groove, and the unitary conductive body covers the conductive seed layer and at least a majority of the side surfaces of the first groove, each of the side surfaces and the unitary conductive body defining a conductor-insulator interface therebetween, the unitary conductive body and the conductive seed layer defining a conductor-conductor interface therebetween, wherein the patterned conductive article has an open area fraction in a range of 80% to 99.95%.

9. The patterned conductive article of claim 8 , wherein the substrate comprises a micropattern of grooves therein, the micropattern of grooves comprising the first groove.

10. The patterned conductive article of claim 9 , wherein the micropattern of grooves comprises a second groove, wherein in a least one cross-section orthogonal to a length of the second groove, the second groove is substantially filled with a substantially transparent material.

11. A patterned conductive article comprising:
a substrate comprising a first groove therein, the first groove having a bottom surface and side surfaces,
a conductive seed layer disposed in the first groove; and
a unitary conductive body disposed at least partially in the first groove,
wherein the conductive seed layer covers at least a majority of the bottom surface of the first groove, and the unitary conductive body covers the conductive seed layer and at least a majority of the side surfaces of the first groove, and wherein in a plane through the unitary conductive body that is parallel to and separate from the conductive seed layer, the unitary conductive body has a lower first line edge roughness at a first interface with the side surfaces and the conductive seed layer has a higher second line edge roughness at an edge of the conductive seed layer, wherein the patterned conductive article has an open area fraction in a range of 80% to 99.95%.

12. A patterned conductive article comprising:
a substrate comprising a first groove therein, the first groove extending along a longitudinal direction and having a bottom surface and side surfaces; and
a monolithic metal layer disposed in the first groove,
wherein in at least one cross-section of the first groove perpendicular to the longitudinal direction, the monolithic metal layer covers at least a majority of the bottom surface of the first groove and covers less than 25% of a total area of the side surfaces of the first groove, and at least a majority of the side surfaces of the first groove does not contact material having a same composition as that of the monolithic metal layer, wherein the patterned conductive article has an open area fraction in a range of 80% to 99.95%.

13. The patterned conductive article of claim 12 , wherein a nonmetallic material is disposed at least partially in the first groove and in the at least one cross-section of the first groove, the nonmetallic material covers at least a majority of the side surfaces of the first groove.

14. A process of making a patterned conductive article, the patterned conductive article having an open area fraction in a range of 80% to 99.95%, the process comprising:
providing a tool having at least one ridge;
disposing a conductive layer on a top surface of a first portion of the at least one ridge such that at least a majority of a total area of side surfaces of the first portion of the at least one ridge is free of the conductive layer;
disposing a resin onto the tool after the disposing the conductive layer step;
solidifying the resin to form a polymeric layer comprising at least one groove corresponding to the at least one ridge; and
removing the polymeric layer and the conductive layer from the tool such that the conductive layer is disposed at a bottom surface of the at least one groove.

15. The process of claim 14 , further comprising depositing conductive material into the at least one groove such that the conductive material covers the conductive layer.

Assignees

• 3M Innovative Properties Company

Inventors

• Johnston Raymond P
• Gotrik Kevin W
• Sullivan John J
• Meyer Kenneth A P
• Carls Joseph C
• Zhang Haiyan
• Abraham Gregory L
• Stay Matthew S

Classifications

• H05K3/4644

  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) · CPC title

• H05K3/207

  using a prefabricated paste pattern, ink pattern or powder pattern · CPC title

• H05K1/0353

  consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement · CPC title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• H05K2203/0723

  Electroplating, e.g. finish plating · CPC title