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Resistive Ribbon with Improved Properties

IP.com Disclosure Number: IPCOM000107359D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 1 page(s) / 43K

Publishing Venue

IBM

Related People

Afzali-Ardakani, A: AUTHOR [+2]

Abstract

Disclosed is the use of organotitanate coupling agents in the fabrication of resistive ribbon with improved properties.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 77% of the total text.

Resistive Ribbon with Improved Properties

       Disclosed is the use of organotitanate coupling agents in
the fabrication of resistive ribbon with improved properties.

      Resistive Ribbon Thermal Transfer Printing is a high quality
thermal transfer printing process, R2T2 (*), in which a matrix print
head produces localized joule heating on a conductive ribbon.  The
heat generated in the resistive ribbon melts the thermoplastic ink
which is transferred to the substrate.

      In fabricating the resistive ribbon, conductive carbon
particles are dispersed in a methylene chloride solution of
polycarbonate resin and coated on a substrate.  After solvent
evaporation, the dried film of 15-25 microns is then delaminated and
cut into narrow ribbons used in the printer. In addition to weight
percent of the conductive carbon (25-30%) in the composite, the
effective dispersion of these particles in polycarbonate is the major
factor determining the conductivity (and uniformity) of the ribbon.

      Disclosed here is a minor modification of the formulation used
to fabricate the resistive ribbon.  An organotitanate coupling agent,
e.g., KRTTS* (0.1-0.5% based on the weight of conductive carbon), is
added to mixture of carbon in polycarbonate solution.  After milling
by known methods, the dispersed mixture is coated on a substrate and
the solvent is evaporated.  The resulting polycarbonate-carbon
composite has very uniform surface resistivity which is an import...