Browse Prior Art Database

Liquid Crystal Polymer Plate Fabrication and Lamination by New Irreversible Annealing Process

IP.com Disclosure Number: IPCOM000122301D
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 62K

Publishing Venue

IBM

Related People

Bross, A: AUTHOR [+4]

Abstract

A unique method is described for fabricating and welding to laminate plates of a liquid crystalline polymer using a newly-discovered, irreversible annealing phenomenon. The unannealed powdered and dried polymer, with melting temperature Tm1, is compressed at a temperature Tc1 / Tm1 with pressure Pc1 to obtain rigid plates. The plates to be welded are converted to a higher melting form by annealing at a temperature Tan1 < Tc1 for time tan1 . The annealed form has melting temperature Tm2 > Tm1 . A plate of the unannealed form is then placed between the annealed plates, and this stack is compressed at temperature Tc2, where Tm1 < Tc2 < Tm2, with pressure Pc2ZPc1 . The welded laminate is then annealed at temperature Tan2ZTan1 for time tan2Ztan1 .

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 63% of the total text.

Liquid Crystal Polymer Plate Fabrication and Lamination by New Irreversible
Annealing Process

      A unique method is described for fabricating and welding to
laminate plates of a liquid crystalline polymer using a
newly-discovered, irreversible annealing phenomenon.  The unannealed
powdered and dried polymer, with melting temperature Tm1, is
compressed at a temperature Tc1 / Tm1 with pressure Pc1 to obtain
rigid plates.  The plates to be welded are converted to a higher
melting form by annealing at a temperature Tan1 < Tc1 for time tan1 .
The annealed form has melting temperature Tm2 > Tm1 .  A plate of the
unannealed form is then placed between the annealed plates, and this
stack is compressed at  temperature Tc2, where Tm1 < Tc2 < Tm2, with
pressure Pc2ZPc1 .  The welded laminate is then annealed at
temperature Tan2ZTan1 for time tan2Ztan1 . The result is a rigid
high-melting laminate, welded with the same material as the plates,
with no noticeable interfaces.

      A recently developed Hoechst Celanese Vectra liquid crystal
polymer was studied which exhibits the properties required for a wide
range of multifunctional applications only if it is processed as
disclosed in the following.  The material was Vectra E-950 (neat
resin) or Vectra E-130 (30% glass fiber-filled resin) with the
composition p-hydroxybenzoic Acid/6-Hydroxy 2-Napthoic
Acid/4,4'-Biphenol/Terepthalic Acid in the mole ratio 60/4/18/18.
The same properties should occur for a range of compos...