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Browse Prior Art Database

Viscosity Modifier and Stabilizer for Teflon Silica Mixtures

IP.com Disclosure Number: IPCOM000103684D
Original Publication Date: 1993-Jan-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 45K

Publishing Venue

IBM

Related People

Diener, C: AUTHOR [+5]

Abstract

Disclosed is a method for stabilizing and adjusting the viscosity of TEFLON*/silica mixtures by the addition of a polyoxypropylene-polyoxyethylene block copolymer surfactant.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 82% of the total text.

Viscosity Modifier and Stabilizer for Teflon Silica Mixtures

       Disclosed is a method for stabilizing and adjusting the
viscosity of TEFLON*/silica mixtures by the addition of a
polyoxypropylene-polyoxyethylene block copolymer surfactant.

      Organic dielectric layers may be prepared by coating a mixture
of finely divided silica and TEFLON polytetrafluoroethylene
dispersion on a suitable substrate [1].  Superfluous coating
constituents, such as surfactants and viscosity modifiers, are
volatilized during a thermal exposure for that purpose.  These
materials must be completely removed to prevent outgassing during the
densification step, in which coatings are subjected to temperatures
greater than 350oC [2] and high pressure.  Blisters result if
outgassing occurs during densification.

      Appropriate quantities of the polyoxypropylene-polyoxyethylene
block copolymer surfactant are added to the TEFLON/silica mixtures to
adjust the solution viscosity.  By optimizing the viscosity, layers
of desired thickness may be coated more conveniently.  This
surfactant also stabilizes the TEFLON/silica dispersion by preventing
agglomeration and settling of the silica particles and eventual loss
of coating solution viscosity.  By the addition of the
polyoxypropylene-polyoxyethylene block copolymer, the stability and
useful life of TEFLON/silica dispersions is lengthened significantly.

      Experimentation shows that only negligible quantities of this
materi...