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US 4,481,251 AGranted
Polyarylate polymer coatings
AssigneeAT&T Bell Laboratories
InventorFrederick Vratny
Life of this patent
Estimating the term…
Abstract
A polyarylate polymer is deposited on a substrate in accordance with a fabrication procedure that ensures an adherent low-stress conformal coating. Such a coating is advantageous for use in a number of industrial applications of practical importance.
Claims12
An article comprising
- a substrate,
- and a final adherent conformal coating over at least a portion of said substrate, in which said coating is prepared by a procedure that includes applying a solution comprising a solvent and solute that includes material which may be regarded as a polymer polymerized from monomer at least 90 percent by weight of which is a mixture of at least one diphenol and at least one dicarboxylic acid,
- said article further comprising an adherent conformal layer intermediate said coating and the surface of said substrate, wherein said intermediate layer comprises a porous matrix.
A method of fabricating an article that includes a surface over at least a portion of which a final conformal coating is to be adhered, said method comprising
- applying over said surface to be coated a solution comprising a solvent and solute that includes material which may be regarded as a polymer polymerized from monomer at least 90 percent by weight of which is a mixture of at least one diphenol and at least one dicarboxylic acid.
A method of fabricating an article that includes a substrate surface over at least a portion of which a final conformal coating is to be adhered, said method comprising the steps of
- applying over said surface to be coated successive layers of a solution including at least 90 percent by weight polyarylate polymer dissolved in a solvent comprising N methyl pyrrolidinone,
- and removing solvent from each successive layer by baking to convert said layers to a substantially solvent-free glass-like coating.
Dependencies are inferred from the claim text.