US 6,183,545 B2 · Aqueous solutions for obtaining metals by reductive deposition

Aqueous solutions for obtaining metals by reductive deposition

AssigneeDaiwa Fine Chemicals Co., Ltd.

InventorsYoshiaki Okuhama, Takao Takeuchi, Masakazu Yoshimoto, Shigeru Takatani, Emiko Tanaka, Masayuki Nishino, Yuji Kato, Yasuhito Kohashi, Kyoko Kuba, Tetsuya Kondo, Keiji Shiomi, Keigo Obata, Mitsuo Komatsu, Hidemi Nawafune

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Abstract

An aqueous solution for the reductive deposition of metals comprising, besides water, (A) a phosphine of the general formula (1) in which R1, R2, and R3 denote lower alkyl groups, at least one of which being hydroxy-or amino-substituted lower alkyl group, and (B) a soluble compound of a metal or a compound of a metal solubilized through the formation of a soluble complex by said phosphine.

Drawings

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Drawings

Claims12

Dependent claims

An aqueous solution for the reductive deposition of metals comprising, besides water,

(A) a phosphine of the general formula (1)
in which R1, R2, and R3 denote lower alkyl groups, at least one of which being hydroxy- or amino-substituted lower alkyl group, and
(B) a soluble compound of a metal or a compound of a metal solubilized through the formation of a soluble complex by said phosphine.

Dependencies are inferred from the claim text.

Description3,978 words

Summary3,043 words

#1. Field of the Invention

#This invention relates to a technique for depositing metals from their aqueous solutions by reduction and, more particularly, to electroplating, electroless plating, manufacture of fine metal particles, and/or recovery of metals.

#2. Description of the Prior Art

Detailed description935 words

#The invention is illustrated by the following several examples, which are not in any way limitative; the conditions to be used may be changed appropriately to suit the intended use and purpose without departing from the scope of the claims.

#An aqueous solution of the following composition was prepared:

#Gold mercaptosuccinate 10 g/l (as gold) Tris (3-hydroxypropyl) phosphine 100 g/l

Facts

Application

09/340,894Filed 28 Jun 1999

Priority

JP 10-19876314 Jul 1998

Granted

6 Feb 2001

Term ended

28 Jun 2019

Estimated · how

20 years from earliest known nonprovisional domestic filing. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination. Patent term adjustment is unavailable; no adjustment was added.

Classification9 codes

C25D 3/02
Electroplating: Baths therefor: from solutions
C22B 3/381
Containing phosphorus: phosphines, e.g. compounds with the formula PRnH3-n, with n = 0-3
C22B 11/046
Recovery of noble metals from waste materials: from manufactured products, e.g. from printed circuit boards, from photographic films, paper or baths
C23C 18/42
Coating with metals: coating with noble metals