Di- or poly-functional electron deficient olefins coated metal powders for solder paste

Patent metadata

Field	Value
Publication number	US-9427829-B2
Application number	US-201414199179-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Sep 6, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

The present invention relates to cured products of di- or poly-functional electron deficient olefins coated onto at least a portion of a surface of metal powders, such as metal powders used as appropriate in the formation of solder alloys, spheres and pastes.

First claim

What is claimed is:

1. A metal particle having di- or poly-functional electron deficient olefin coated on at least a portion of a surface thereof, wherein the di- or poly-functional electron deficient olefin is embraced by the following structure

wherein R 1 is C 1 -C 40 alkyl, C 2 -C 40 alkenyl, or C 3 -C 40 cycloalkyl group, with hydroxyl or alkoxy functionality and/or ether linkages being optional, and n is 2-4.

2. A metal particle according to claim 1 wherein the di- or poly-functional electron deficient olefin has a ceiling temperature below or equal to a melting point of the metal particle.

3. A metal particle according to claim 1 wherein the di- or poly-functional electron deficient olefin further comprises cyanoacrylate monomers embraced by the following structure:

wherein R 1 is C 1 -C 40 alkyl, C 2 -C 40 alkenyl, or C 3 -C 40 cycloalkyl group, with hydroxyl or alkoxy functionality and/or ether linkages being optional, and n is 1.

4. A metal particle according to claim 1 wherein the cyanoacrylate is selected from the group consisting of 1,5-pentanediol bis-cyanoacrylate, 1,6-hexanediol bis-cyanoacrylate, 1,8-octanediol bis-cyanoacrylate, 1,9-nonanediol bis-cyanoacrylate, 1,10-decanediol bis-cyanoacrylate and 1,12-dodecanediol bis-cyanoacrylate.

5. A metal particle according to claim 1 wherein the metal particle is solder.

6. A metal particle according to claim 1 wherein the metal particle is made from elemental metals.

7. A metal particle according to claim 1 wherein the metal particle is made from an alloy.

8. A metal particle according to claim 1 wherein the metal particle is made from an elemental metal selected from the group consisting of tin, silver, copper, lead, zinc, indium, bismuth, and rare earth metals.

9. A metal particle according to claim 1 wherein the metal particle is made from an alloy selected from the group consisting of tin/silver/copper, tin/bismuth, tin/lead, tin/zinc and tin/indium/bismuth alloys.

10. A metal particle according to claim 1 wherein the polymer coating on the metal particle is less than about 5 μm in thickness.

11. A metal particle according to claim 1 wherein the polymer coating on the metal particle is in the range from about 0.0001 to about 3.0 μm in thickness.

12. A metal particle according to claim 1 wherein the polymer coating on the metal particle is in the range from about from 0.001 to about 1 μm in thickness.

13. A solder paste composition comprising the coated metal particle according to claim 1 .

14. A solder paste composition claim 13 wherein the coated metal particles are present in amount of from about 5 to about 98% by weight with respect to the total component.

15. A method of forming a polymer coated metal particle according to claim 1 which includes the steps of:
a) providing a plurality of metal particles;
b) applying a di- or poly-functional electron deficient olefin to substantially coat at least a portion of the surface of the metal particles; and
c) permitting di- or poly-functional electron deficient olefin to cure as a polymer coating on the metal particles.

16. A method of forming a solder paste composition according to claim 13 which includes the steps of:
a) providing solder powder comprising the coated metal particle;
b) providing solder paste components; and
c) blending the polymer coated solder powder with the solder paste components to form a solder paste.

Assignees

• Henkel IP & Holding GmbH

Inventors

• Liu Puwei
• Burns Barry N
• Holloway Matthew J
• Olsen Blake
• Ho Edward
• Killoran John

Classifications

• B22F1/102

  Metallic powder coated with organic material · CPC title

• C08L33/20

  Homopolymers or copolymers of acrylonitrile (C08L55/02 takes precedence) · CPC title

• C07C255/23

  containing cyano groups and carboxyl groups, other than cyano groups, bound to the same unsaturated acyclic carbon skeleton · CPC title

• B23K35/262

  Sn as the principal constituent · CPC title

• B23K35/025

  Pastes, creams or slurries · CPC title