Ultraviolet curable ink composition

• US 5,093,038 A
• Filed: 01/30/1990
• Issued: 03/03/1992
• Est. Priority Date: 06/14/1989
• Status: Expired due to Fees

• Current Assignee: Poly-Flex Circuits Incorporated (PARLEX USA LLC)
• Original Assignee: Key-Tech, Inc.
• Inventors: Durand, David
• Primary Examiner(s): Barr, Josephine
• Application Number:
  US07/472,190
• Time in Patent Office: 763 Days
• Field of Search: 252/513, 252/514, 252/519, 252/512, 523/457-459, 522/71, 522/1, 106/20
• US Class Current: 252/514
• CPC Class Codes: C09D 11/101 Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
• CPC Class Codes: C09D 11/52 Electrically conductive inks
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• CPC Class Codes: H01F 41/16 the magnetic material being applied in the form of particles, e.g. by serigraphy , to form thick magnetic films or precursors therefor H01F41/18 -H01F41/24 take precedence
• CPC Class Codes: H05K 1/095 for polymer thick films, i.e. having a permanent organic polymeric binder
• CPC Class Codes: H05K 2201/083 Magnetic materials
• CPC Class Codes: H05K 2203/104 Using magnetic force, e.g. to align particles or for a temporary connection during processing
• CPC Class Codes: H05K 3/1283 After-treatment of the printed patterns, e.g. sintering or curing methods
• CPC Class Codes: H05K 3/245 Reinforcing conductive patterns made by printing techniques or by other techniques for applying conductive pastes, inks or powders; Reinforcing other conductive patterns by such techniques

Abstract

A method for producing a circuit board involves printing a U.V. curable ink onto a substrate in a desired circuit pattern and curing the ink by exposing it to a pulsed U.V. source or subjecting the circuit pattern prepared from a U.V. curable ink containing magnetite particles to a magnetic field to move the magnetite particles to the upper surface of the U.V. curable ink. Other embodiments include circuit boards made in accordance with these methods and the use of the U.V. curable ink as a shielding composition for enclosures housing electronic equipment.

Claims

1. A U.V. curable ink comprising a suspension of silver coated magnetite particles having a size distribution ranging from 1 to 30 microns in a cycloaliphatic epoxy resin binder and an onium salt cationic photoinitiator in an amount effective to cure said curable ink under the influence of U.V. radiation, said silver coated magnetite particles being present in said U.V. curable ink in an amount of 25 to 67 volume percent based on the total volume of said U.V. curable ink.

2. The U.V. curable ink of claim 1 wherein said onium cationic photoinitiator is a triarylsulfonium salt, a diaryliodonium salt, an aryldiazonium compound or a triarylsilenonium compound.

3. The U.V. curable ink of claim 1 which also contains a polyol plasticizer containing a polyether or polyester backbone, said polyol plasticizer being present in an amount such that on curing said U.V. curable ink the cured ink is flexible.

4. The U.V. curable ink of claim 3 wherein said polyol plasticizer in a polyether polyol.