Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1989-03-09
1990-12-18
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
524599, 524600, 524606, 528125, 528128, 528185, 528188, 528191, 528220, 528229, 528320, 528321, 528353, C08G 7322
Patent
active
049787349
ABSTRACT:
The present invention provides polyamide-polyamide and polybenzoxazole-polyamide polymers derived therefrom with improved processing and film characteristics having incorporated into the polymeric backbone the polymeric condensation residuum of novel aromatic diamino compounds having the formula: ##STR1## wherein A is selected from the group consisting of SO.sub.2, O, S, CO, C.sub.1 to C.sub.6 alkylene, perfluoroalkylene or perfluoroalkylene having from 1 to 10 carbon atoms and a bond directly linking the two aromatic groups and R is selected from the group consisting of hydrogen, hydroxy and C.sub.1 to C.sub.4 alkoxy.
The polyamide-polyamide polymers of this invention are prepared by reacting compounds of the above formula, alone or admixed with othr aromatic diamines, with one or more aromatic or aliphatic dicarboxylic acid or amide-forming derivatives thereof. Polybenzoxazole-polyamide drivatives of such polyamide-polyamide polymers are prepared utilizing compounds of the above formula wherein R is hydroxy or C.sub.1 to C.sub.4 alkoxy, and by subjecting the resulting alkoxy or hydroxy-substituted polyamide-polyamide to a dehydrating and cyclizing reaction to form the oxazole linkage which gives rise to polybenzoxazole-polyamide polymer.
REFERENCES:
patent: 3984375 (1976-10-01), Frost
patent: 4111906 (1978-09-01), Jones et al.
Anderson Harold D.
Hoechst Celanese Corp.
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