C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/57, 18/664
C08J 9/06 (2006.01) C08G 63/60 (2006.01) C08J 9/10 (2006.01) C08J 9/36 (2006.01) C09K 19/38 (2006.01)
Patent
CA 1194649
SUMMARY OF THE INVENTION ABSTRACT Accordingly, in accordance with the present invention, there is provided a foam which exhibits good thermal, flame and solvent stability and desirable mechanical properties which is comprised of a rigid foamed wholly aromatic polymer which is capable of forming an anisotropic melt phase and which comprises not less than about 10 mole percent of recurring units of the following moiety: Image and wherein at least some of the hydrogen atoms present upon the rings optionally may be replaced by substitution selected from the group consisting of an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, halogen, phenyl, substituted phenyl and mixtures thereof. Accordingly, in accordance with one aspect of the pre- sent invention, there is provided a method of producing a foam which exhibits good thermal, flame and solvent stability and desirable mechanical properties which is comprised of a rigid foamed wholly aromatic thermotropic liquid crystal polymer which comprises not less than about 10 mole percent of recurring units which include a naphthalene moiety which method includes subjec- ting said foam to a heat treatment sufficient to increase the melting temperature of the polymer at least 10 centigrade degrees. In accordance with another aspect of the present inven- tion, there is provided a foam which exhibits good thermal, flame and solvent stability and desirable mechanical properties which is comprised of a wholly aromatic thermotropic liquid crystal polymer comprised of not less than about 10 mole percent of recurring units which include a naphthalene moiety which foam has been subjected to a heat treatment for a period of time and at a temperature sufficient to increase the melting temperature of the polymer at least 10 centigrade degrees.
406327
Celanese Corporation
Smart & Biggar
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