Stable catalysts for electroless metallization

Patent metadata

Field	Value
Publication number	US-2016332153-A1
Application number	US-201615221705-A
Country	US
Kind code	A1
Filing date	Jul 28, 2016
Priority date	Mar 15, 2013
Publication date	Nov 17, 2016
Grant date	—

Abstract

Aqueous catalysts of nanoparticles of precious metals and stabilizers of flavonoid derivatives are used to electrolessly plate metal on non-conductive substrates. Such substrates include printed circuit boards.

First claim

1 . An aqueous catalyst solution comprising one or more reducing agents and nanoparticles comprising one or more precious metals and one or more flavonoid glycosides and hydrates thereof.

2 . The aqueous catalyst solution of claim 1 , wherein the one or more flavonoid glycosides have a general formula:

wherein R 1 , R 2 , R 3 and R 4 are independently hydrogen, hydroxyl, linear or branched (C 1 -C 6 )alkoxy, linear or branched (C 1 -C 6 )acetate or —O-carbohydrate; Z 1 is >C═O or a structure having formula:

wherein R 5 and R 6 are independently hydrogen, or ring C, when Z 1 forms a double bond with the carbon at position 3 of ring B, only one of R 5 and R 6 is present and joined to the carbon at position 2; Z 2 is a structure having formula:

wherein R 7 and R 8 are independently hydrogen, hydroxyl, ring C or —O-carbohydrate, when Z 2 forms a double bond with the carbon at position 2 or 4 of ring B, only one of R 7 and R 8 is present and joined with the carbon of position 3; Z 3 is >C═O or a structure having formula:

wherein R 9 and R 10 are hydrogen, when Z 3 forms a double bond with the carbon at position 3 of ring C, only one of R 9 and R 10 is present and joined to the carbon at position 4; and

R 1′ , R 2′ , R 3′ , R 4′ and R 5′ of ring C are independently hydrogen, hydroxyl, linear or branched (C 1 -C 6 )alkoxy, linear or branched (C 1 -C 6 )acetate or —O-carbohydrate, wherein at least one of ring A, B or C includes —O-carbohydrate.

3 . The aqueous catalyst solution of claim 1 , wherein the nanoparticles are 1 nm to 1000 nm.

4 . The method of claim 1 , wherein a molar ratio of the one or more precious metals to the one or more flavonoid glycosides and hydrates ranges from 1:0.1 to 1:5.

5 - 7 . (canceled)

Assignees

• Rohm & Haas Elect Mat

Inventors

• Liu Feng
• Rzeznik Maria Anna

Classifications

• B01J35/45

  Nanoparticles · CPC title

• C23C18/38

  Coating with copper · CPC title

• C23C18/34

  using reducing agents · CPC title

• B01J35/0013

  Operations & Transport · mapped topic

• B01J23/44

  Palladium · CPC title