Encapsulant for leads in an aqueous environment

• US 6,203,871 B1
• Filed: 10/14/1998
• Issued: 03/20/2001
• Est. Priority Date: 10/14/1998
• Status: Expired due to Term

• Current Assignee: Funai Electric Co., Ltd.
• Original Assignee: Lexmark International Incorporated (Ninestar Corporation)
• Inventors: Patil, Girish Shivaji
• Primary Examiner(s): Dye, Rena L.
• Assistant Examiner(s): HON, SOW FUN
• Application Number:
  US09/172,057
• Time in Patent Office: 888 Days
• Field of Search: 428/68, 428/344, 428/345, 428/555.EP, 428/413, 428/416, 428/418, 428/457, 428/35.8, 525/522, 525/523, 522/103-109, 338/275, 430/280.1
• US Class Current: 428/35.8
• CPC Class Codes: H01B 3/40 epoxy resins
• CPC Class Codes: Y10T 428/1355 Elemental metal containing [e.g., substrate, foil, film, coating, etc.]

Abstract

An article, specifically an inkjet printhead, having electrical leads in an aqueous environment in which the leads are encapsulated in a thoroughly cured mixture of 88 parts bis-phenol A epoxy oligomer, 11 parts epoxy novolac oligomer, and 1 part triarylsulfonium hexafluoroantimonate salts. No special atmosphere is required during manufacture and the uncured mixture has a long pot life. The cured mixture has excellent resistance to an aqueous environment.

Claims

1. An article of manufacture having an electrical lead in a liquid aqueous environment, said lead being encapsulated in a thoroughly cured mixture substantially as follows by weight:

88% bis-phenol A epoxy oligomer;

11% epoxy novolac oligomer; and

1% ultra violet cure initiator.

2. The articles as in claim 1 in which said initiator is hexafluoroantimonate salts.

3. The article as in claim 2 in which said epoxy oligomer is

and said novolac oligomer is

4. The article as in claim 3 in which said hexafluoroantimonate salts is a mixture triarylsulfonium hexafluoroantimonate salts.

5. The article in claim 3 in which n_a is about 0.15 and n_b is about 0.2.

6. The article in claim 4 in which n_a is about 0.15 and n_b is about 0.2.