Catalysts for electroless metallization containing five-membered heterocyclic nitrogen compounds

Patent metadata

Field	Value
Publication number	US-9364822-B2
Application number	US-201313930736-A
Country	US
Kind code	B2
Filing date	Jun 28, 2013
Priority date	Jun 28, 2013
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

Catalysts include five-membered nitrogen containing heterocyclic compounds as ligands for metal ions which have catalytic activity. The catalysts are used to electrolessly plate metal on metal clad and un-clad substrates.

First claim

What is claimed is:

1. A method comprising:
a) providing a catalyst comprising complexes of metal ions and one or more compounds having formula:

wherein R 1 may be hydrogen, substituted or unsubstituted, linear or branched (C 1 -C 6 )alkyl, hydroxyl, ester or (C 1 -C 4 )alkoxy; R 2 and R 3 may be the same or different and may be hydrogen, substituted or unsubstituted, linear or branched (C 1 -C 4 )alkyl, hydroxyl, ester (C 1 -C 4 )alkoxy or ureido; and Z is either

 wherein R 4 and R 5 may be the same or different and may be hydrogen, linear or branched, substituted or unsubstituted (C 1 -C 4 )alkyl, hydroxyl or (C 1 -C 4 )alkoxy; and R 6 may be hydrogen, substituted or unsubstituted, linear or branched (C 1 -C 6 )alkyl, hydroxyl, ester or (C 1 -C 4 )alkoxy;

b) applying the catalyst to a substrate;
c) applying a reducing agent to the catalyst; and
d) immersing the substrate with the catalyst into a metal plating bath to electrolessly plate metal on the substrate.

2. The method of claim 1 , wherein the one or more compounds are chosen from hydantoin, 1-methylhydantoin, 1,3-dimethylhydantoin, 5,5-dimethylhydantoin, allantoin, 1,3-dihydroxymethyl-5,5-dimethylhydantoin and succinimide.

3. The method of claim 1 , wherein a molar ratio of the one or more compounds to the metal ions is 1:1 to 4:1.

4. The method of claim 1 , wherein the metal ions are chosen from palladium, silver, gold, platinum, copper, nickel and cobalt.

5. The method of claim 1 , wherein the metal of the metal plating bath is chosen from copper, copper alloy, nickel and nickel alloy.

6. The method of claim 1 , wherein the one or more compounds are in amounts of 25 ppm to 1000 ppm.

Assignees

• Rohm & Haas Elect Mat

Inventors

• Milum Kristen M
• Cleary Donald E
• Rzeznik Maria Anna

Classifications

• C23C18/30 Primary

  Activating {or accelerating or sensitising with palladium or other noble metal} · CPC title

• C23C18/1837

  Multistep pretreatment · CPC title

• C23C18/1844

  with use of organic or inorganic compounds other than metals, first · CPC title

• B01J2531/824

  Palladium · CPC title

• B01J2531/17

  Silver · CPC title