Protective coated composite material

• US 4,961,994 A
• Filed: 12/16/1987
• Issued: 10/09/1990
• Est. Priority Date: 12/16/1987
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: General Electric Company
• Inventors: Cariou, Frank E., Harris, Theodore A. Jr.
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): GRAY, JILL M
• Application Number:
  US07/133,774
• Time in Patent Office: 1,028 Days
• Field of Search: 428/461, 428/469, 428/500, 428/702, 428/912.2, 428/428
• US Class Current: 428/408
• CPC Class Codes: B64G 1/54 Protection against radiation
• CPC Class Codes: C08G 2261/3424 non-conjugated, e.g. paracyclophanes or xylenes
• CPC Class Codes: C08G 2261/592 against heat
• CPC Class Codes: C08G 2261/596 against oxidation
• CPC Class Codes: C08G 2261/598 Chemical stability
• CPC Class Codes: C08J 2363/00 Characterised by the use of epoxy resins; Derivatives of epoxy resins
• CPC Class Codes: C08J 2465/04 Polyxylylenes
• CPC Class Codes: C08J 7/0423 with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/046 Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: C09D 165/04 Polyxylylenes
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]
• CPC Class Codes: Y10T 428/31511 Of epoxy ether

Abstract

An improved composite material which overcomes the moisture problem associated with other composite materials includes a protective waterproof coating of material such as a poly-para-xylylene over the composite material.

Claims

1. A protective coated composite material consisting essentially of:

a graphite-epoxy composite material or a composite material containing graphite fibers,

a poly-para-xylylene waterproofing layer over said composite material,

a metal oxide layer over said waterproofing layer,

a third layer of a reflecting metal over said metal oxide layer, and

a second metal oxide layer over said third layer.

2. The combination of claim 1 wherein said poly-para-xylylene is deposited by thermal sublimation of the crystalline dimer, thermal cleavage of the dimer into highly reactive monomer-di-radicals, followed by spontaneous polymerization onto the surface of said composite material maintained in the temperature range of -50°

C. to +50°

C.