Parylene stabilization

• US 4,163,828 A
• Filed: 01/20/1978
• Issued: 08/07/1979
• Est. Priority Date: 01/20/1978
• Status: Expired due to Term

• Current Assignee: Specialty Coating Systems Inc.
• Original Assignee: Union Carbide Corporation (Dow, Inc.)
• Inventors: Mahoney, Dennis M.
• Primary Examiner(s): Pianalto, Bernard D.
• Application Number:
  US05/871,145
• Time in Patent Office: 564 Days
• Field of Search: 427/248 H, 428/500, 428/411
• US Class Current: 428/523
• CPC Class Codes: C08G 2261/3424 non-conjugated, e.g. paracyclophanes or xylenes
• CPC Class Codes: C08G 61/025 Polyxylylenes
• CPC Class Codes: C09D 165/04 Polyxylylenes
• CPC Class Codes: Y10T 428/31938 Polymer of monoethylenically unsaturated hydrocarbon

Abstract

A process for making an article comprising (a) a solid substrate and (b) a coating on said substrate, said coating comprising parylene admixed with (i) a sterically hindered phenol vaporizable at a temperature in the range of about 20° C. to about 150° C. or (ii) pyrogallol,

Said process comprising the following steps:

(A) vaporizing a substituted or unsubstituted p-xylylene diradical and said phenol or pyrogallol; and

(B) introducing the vapors from step (A) into a deposition zone containing the substrate, said zone being under vacuum and at a temperature at which the vapors will condense,

Whereby the vapors condense on the substrate, the diradical polymerizing to parylene, coating the substrate and forming the article, and the defined article.

Claims

1. An article comprising:

(a) a solid substrate; and

(b) a coating on said substrate, said coating comprising parylene admixed with (i) a sterically hindered phenol vaporizable at a temperature in the range of about 20°

C. to about 150°

C. (ii) pyrogallol wherein the amount of phenol or pyrogallol admixed with the parylene is about 0.1 to about 15 percent by weight based on the weight of the parylene.

2. The article defined in claim 1 wherein the parylene is admixed with the hindered phenol.

3. The article defined in claim 2 wherein the phenol is 2, 6 dimethyl phenol;

2, 6-di-tert-butyl-4-methyl phenol;

or 2, 6-di-tert-butyl-4-n-butyl-phenol.

4. The article defined in claim 2 wherein the hindered phenol is derived from 1, 1, 3-tris (2-methyl-4-hydroxy-5-tert-butyl-phenyl) butane.

5. The article defined in claim 1 wherein the parylene is admixed with pyrogallol.