Composition and method for priming substrate materials

• US 6,174,561 B1
• Filed: 01/30/1998
• Issued: 01/16/2001
• Est. Priority Date: 01/30/1998
• Status: Expired due to Term

• Current Assignee: James M Taylor
• Original Assignee: James M Taylor
• Inventors: Taylor, James M.
• Primary Examiner(s): Talbot, Brian K.
• Application Number:
  US09/016,048
• Time in Patent Office: 1,082 Days
• Field of Search: 427/96, 427/302, 427/372.2, 427/388.1, 427/421, 252/79.3, 148/282
• US Class Current: 427/97.1
• CPC Class Codes: H05K 3/22 Secondary treatment of printed circuits H05K3/1283 takes precedence; embedding circuits in grooves by pressure H05K3/107
• CPC Class Codes: H05K 3/241 characterised by the electroplating method; means therefor, e.g. baths or apparatus
• CPC Class Codes: H05K 3/282 for inhibiting the corrosion of the circuit, e.g. for preserving the solderability
• CPC Class Codes: Y10T 428/24917 including metal layer
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

The formulation primes materials used in the processing of substrates. The formulation comprises one or more filming amines which are mixed with and neutralized by an appropriate acid or combination of acids. Water is used as the solvent and a surfactant is optionally added to aid in the cleaning, anti-foaming and wetting of the substrates. Printed circuit boards, chemically milled alloys and chemically plated alloys can be coated with the formulation as a one-step priming method prior to lamination of a resist layer.

Claims

1. A method of preparing a primed substrate, comprising:

obtaining a solution comprising from about 0.003% to about 3.0% of a film forming amine and sufficient acid to produce a pH of less than about 6.5;

coating at least a portion of the substrate with the solution, thereby forming a hydrophobic film comprising an amine on the outer surface of the substrate; and

forming a second coating on the hydrophobic film.

2. The method of claim 1, wherein the coating step comprises immersing the substrate in the solution.

3. The method of claim 1, wherein the coating step comprises spraying said at least a portion of the substrate with the solution.

4. The method of claim 1, additionally comprising rinsing the substrate after the coating step.

5. The method of claim 1, wherein said solution comprises a plurality of film forming amines.

6. The method of claim 1, wherein said solution comprises a plurality of acids.

7. The method of claim 1, wherein the acid is selected from the group consisting of hydrochloric, sulfuric, sulfamic, methane sulfonic, gallic, maleic and fumaric acids.

8. The method of claim 1, further comprising drying the substrate after the coating step.

9. The method of claim 5 wherein said plurality of film forming amines inhibits oxidation of said substrate.

10. The method of claim 6 wherein said plurality of acids reduces the pH of said solution to below 4.

11. The method of claim 1 wherein said film forming amine is selected from the group consisting of fatty acid amines, long chain alkylamines and amino methacrylates.

12. The method of claim 5 wherein said plurality of film forming amines is selected from the group consisting of fatty acid amines, long chain alkylamines and amino methacrylates.

13. The method of claim 1 wherein said film forming amine is selected from the group consisting of primary amines, secondary amines, tertiary amines;

alkylamines;

C-8 through C-22 amines;

basic mono cyclic tertiary amines, stabilized abietylamines, diaminopropanes, dehydroabietylamines, and ethoxylates, salts and adducts thereof.

14. The method of claim 5 wherein said plurality of film forming amines is selected from the group consisting of primary amines, secondary amines, tertiary amines;

alkylamines;

C-8 through C-22 amines;

basic mono cyclic tertiary amines, stabilized abietylamines, diaminopropanes, dehydroabietylamines, and ethoxylates, salts and adducts thereof.