High optical contrast resin composition and electronic package utilizing same

• US 6,337,375 B1
• Filed: 09/13/2000
• Issued: 01/08/2002
• Est. Priority Date: 02/18/1998
• Status: Expired due to Fees

• Current Assignee: GlobalFoundries, Inc.
• Original Assignee: International Business Machines Corporation
• Inventors: Johansson, Gary A., Papathomas, Konstantinos I.
• Primary Examiner(s): LAM, CATHY FONG FONG
• Application Number:
  US09/660,851
• Time in Patent Office: 482 Days
• Field of Search: 428/209, 525/523, 523/400, 528/7.A, 528/422, 528/332
• US Class Current: 525/523
• CPC Class Codes: H05K 1/0269 for visual or optical inspection
• CPC Class Codes: H05K 1/0373 containing additives, e.g. fillers H05K1/036 takes precedence
• CPC Class Codes: H05K 2203/161 Using chemical substances, e.g. colored or fluorescent, for facilitating optical or visual inspection
• CPC Class Codes: H05K 3/4644 by building the multilayer layer by layer, i.e. build-up multilayer circuits making via holes in the insulating layers H05K3/0011; special circuit boards as base or core whereon the multilayer is built H05K3/4602
• CPC Class Codes: Y10S 428/901 Printed circuit
• CPC Class Codes: Y10T 428/24917 including metal layer
• CPC Class Codes: Y10T 428/31522 Next to metal

Abstract

A composition for use in making high optical contrast and UV light fluorescing dielectric material usuable in printed circuit boards, which in turn may form part of an electronic package. The composition comprises a resin, a coloring agent, and a fluorescing agent. A dielectric material is also defined that comprises a reinforcing material combined with the composition, the dielectric material forming at least one layer in combination with at least one conductive layer for the electronic package.

Claims

1. A composition comprising:

a resin material, a coloring agent, and a fluorescing agent;

wherein said resin material is selected from the group consisting of epoxy, cyanate, and bismaleimide resins;

wherein said epoxy polymer resin comprises epoxides derived from mononucleur and polynucleur dihydric phenols;

wherein said cyanate resin material comprises a polyfunctional cyanate ester monomer or prepolymer, having the formula R—

(—

O—

C≡

N)_m, where m=2-5 and R is an aromatic organic group, the cyanate groups being bonded to an aromatic ring of said aromatic organic group; and

wherein said bismaleimide resin material comprises a polyfunctional maleimide resin, said polyfunctional maleimide resin is selected from the group consisting of 1,3- or 1,4-dimaleimide benzene, 1,3- or 1,4-bis(maleimide methylene)benzene, 1,3- or 1,4-dimaleimide cyclohexane, 1,3- or 1,4-bis(maleimide methylene)cyclohexane, 4,4′

-dimaleimide biphenyl, bis(4-maleimidephenyl) methane, bis(4-maleimidephenyl) ether, bis(4-maleimidephenyl) sulfone, bis(4-maleimide-3-methylphenyl) methane, bis(4-maleimide-3-chlorophenyl) methane, bis(4-maleimide-3,5-dimethylphenyl) methane, 2,2′

-bis(4-maleimide-3-methylphenyl)propane, 2,2′

-bis(4-maleimide-3,5-dibromophenyl) propane, bis(4-maleimidephenyl) phenylmethane, 3,4-dimaleimidephenyl-4′

-maleimidephenylmethane, 1,1′

-bis(4-maleimidephenyl)-1-phenylmethane, and maleimide.

2. The composition of claim 1, wherein said resin material comprises about 78 percent to about 98 percent by weight of said composition.

3. The composition of claim 1, wherein said coloring agent is selected from the group consisting of organic dyes, organic pigments, and inorganic pigments.

4. The composition of claim 3, wherein said coloring agent comprises from about 0.01 percent to about 10 percent by weight of said composition.

5. The composition of claim 1, wherein said fluorescing agent comprises a UV absorbing compound with enhanced fluorescent characteristics.

6. The composition of claim 5, wherein said UV absorbing compound is selected from the group consisting of tetrafunctional epoxy resins, benzoxazoles, pyrazolines, stilbenes, and aminocoumarins.

7. The composition of claim 6, wherein said UV absorbing compound comprises from about 0.01 percent to about 12 percent by weight of said composition.