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Casting Films

IP.com Disclosure Number: IPCOM000091697D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Merten, RA: AUTHOR

Abstract

Solutions of polymeric materials dissolved in solvents are spread upon a smooth, flat casting surface such as a fluorinated polyolefin sheet, dried to form a film, and the film is then removed for testing or other processing. On occasion, the relationship between the solution and the casting surface is such that the solution does not wet the surface. When this relationship exists, the surface tension of the solution causes it to form into useless, discontinuous globules. These difficulties are avoided by pretreating the casting surface with a release agent or dry film lubricant, for example, of the fluorocarbon type. This creates improved wetability between the casting surface and polymer solutions, and encourages the formation of continuous smooth films.

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Casting Films

Solutions of polymeric materials dissolved in solvents are spread upon a smooth, flat casting surface such as a fluorinated polyolefin sheet, dried to form a film, and the film is then removed for testing or other processing. On occasion, the relationship between the solution and the casting surface is such that the solution does not wet the surface. When this relationship exists, the surface tension of the solution causes it to form into useless, discontinuous globules. These difficulties are avoided by pretreating the casting surface with a release agent or dry film lubricant, for example, of the fluorocarbon type. This creates improved wetability between the casting surface and polymer solutions, and encourages the formation of continuous smooth films.

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