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US 4,940,608 AGranted
Local electroless plating process for plastics
AssigneeOkuno Chemical Industry Co., Ltd.
InventorsShigemitsu Kawagishi, Toshiyuki Kita
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Abstract
A local electroless plating process for plastics comprising the steps of: coating the nonplating surface portion of a shaped plastic product with a pasty masking composition comprising a polymer and at least one compound selected from the group consisting of a sulfur compound, nitrogen compound and silicon compound; roughening the surface portion of the plastics product to be plated and applying a catalyst to the rough-surfaced portion; electrolessly plating the plastics product; and removing the polymer coating from the nonplating surface portion of the plastics product.
Claims18
A local electroless plating process for plastics comprising the steps of:
- (1) coating the nonplating surface portion of a shaped plastics product with a pasty masking composition comprising a polymer and at least one compound selected from the group consisting of a sulfur compound, nitrogen compound and silicon compound;
- (2) roughening the surface portion of the plastics product to be plated and applying a catalyst to the rough-surfaced portion;
- (3) electrolessly plating the plastics product;
- and
- (4) thereafter removing the polymer coating from the nonplating surface portion of the plastics product by use of absolute ethanol, absolute methanol, or a mixture of 85 to 90% ethanol or methanol and 15 to 10% of 25% ammonia water;
- wherein the sulfur compound contained in the masking composition, is at least one compound selected from the group consisting of potassium xanthate, potassium dibutyldithiocarbamate, thiourea, thiourea derivatives, thioethanol, mercaptobenzothiazole, mercaptobenzodiol, thiosemicarbazide, thioglycollic acid and mercaptan;
- wherein the nitrogen compound contained in the masking composition, is at least one compound selected from the group consisting of triazole, benzotriazole and benzotriazole derivatives;
- and
- wherein the silicon compound contained in the masking composition, is at least one compound selected from the group consisting of mercaptopropyltrimethoxysilane, methyltriethoxysilane, aminosilane, trimethylchlorosilane and vinyltriethoxysilane.
6 more elements
A local electroless plating process for plastics comprising the steps of:
- (1) coating the nonplating surface portion of a shaped plastics product with a pasty masking composition comprising a polymer and at least one compound selected from the group consisting of a sulfur compound, nitrogen compound and silicon compound;
- (2) roughening the surface portion of the plastics product to be plated and applying a catalyst to the rough-surfaced portion;
- (3) removing the polymer coating from the nonplating surface portion of the plastics product by use of absolute ethanol, absolute methanol, or a mixture of 85 to 90% ethanol or methanol and 15 to 10% of 25% ammonia water;
- and
- (4) thereafter electrolessly plating the plastics product;
- wherein the sulfur compound contained in the masking composition, is at least one compound selected from the group consisting of potassium xanthate, potassium dibutyldithiocarbamate, thiourea, thiourea derivatives, thioethanol, mercaptobenzothiazole, mercaptobenzodiol, thiosemicarbazide, thioglycollic acid and mercaptan;
- wherein the nitrogen compound contained in the masking composition, is at least one compound selected from the group consisting of triazole, benzotriazole and benzotriazole derivatives;
- and
- wherein the silicon compound contained in the masking composition, is at least one compound selected from the group consisting of mercaptopropyltrimethoxysilane, methyltriethoxysilane, aminosilane, trimethylchlorosilane and vinyltriethoxysilane.
6 more elements
A local electroless plating process for plastics comprising the steps of:
- (1) coating the nonplating surface portion of a shaped plastics product with a pasty masking composition comprising a polymer and at least one compound selected from the group consisting of a sulfur compound, nitrogen compound and silicon compound;
- (2) roughening the surface portion of the plastics product to be plated and applying a catalyst to the rough-surfaced portion;
- (3) removing the polymer coating from the nonplating surface portion of the plastics product by use of a mixture of equal parts of ethanol and methanol;
- and
- (4) electrolessly copper plating the plastics product;
- wherein the sulfur compound contained in the masking composition, is at least one compound selected from the group consisting of potassium xanthate, potassium dibutyldithiocarbamate, thiourea, thiourea derivatives, thioethanol, mercaptobenzothiazole, mercaptobenzodiol, thiosemicarbazide, thioglycollic acid and mercaptan;
- wherein the nitrogen compound contained in the masking composition, is at least one compound selected from the group consisting of triazole, benzotriazole and benzotriazole derivatives;
- and
- wherein the silicon compound contained in the masking composition, is at least one compound selected from the group consisting of mercaptopropyltrimethoxysilane, methyltriethoxysilane, aminosilane, trimethylchlorosilane and vinyltriethoxysilane.
6 more elements
Dependencies are inferred from the claim text.