GB1102337A - Polyamide esters and polyimides - Google Patents

Abstract

The invention comprises polyamide-esters of inherent viscosity at least 0.04 and formula <FORM:1102337/C3/1> where R is a hydrocarbon radical having 1 or 2 aromatic rings and R1 is a C6- 10 hydrocarbon radical having 1 or 2 aromatic rings. They may be prepared by heating the diaryl ester of the corresponding amino-dicarboxylic acid at 100-200 DEG C., where the alkyl group may contain up to 5 carbon atoms. Esters specified are diphenyl 3-aminophthalate, diphenyl 4-aminophthalate, the diphenyl ester of 3-aminonaphthalene - 1,8 - dicarboxylic acid, 2-aminonaphthalene - 1,8 - dicarboxylic acid, 4-aminonaphthalene -1,8 - dicarboxylic acid and 5 - aminonaphthalene - 2,3 - dicarboxylic acid, di - p - tolyl 3 - aminophthalate, phenyl naphthyl 4 - aminophthalate, and the phenyl p-tolyl ester of 4-aminonaphthalene-1,2-dicarboxylic acid. The product which may contain some phenol as plasticizer and may have an inherent viscosity up to 5.0 may be shaped in to fibre, films, rods and tubes or used as a self-curing coating on one of many specified substrates. Fillers, e.g. pigments, electrical conducting carbon black, abrasives, metals, di-electrics, and lubricating or other polymers may be added before or after shaping and the material may be foamed by adding blowing agents or by bubbling air, CO2 or N2 through the molten polymer before shaping. The polyamide-ester may be converted to a polyimide by heating at above 175 DEG C., preferably under reduced pressure.ALSO:Substrates may be coated with polyamideesters of formula: <FORM:1102337/B1-B2/1> where R is composed of 1 or 2 aromatic rings, R\sv is composed of 1 or 2 aromatic rings and n is such that the inherent viscosity is at least 0.04. The coating may be applied by doctoring, rolling, dipping, brushing or spraying. Substrates specified are copper, brass, aluminium, steel, as sheets, fibres, wires and screening, asbestos, glass, Cellophane (R.T.M.), wood, paper, polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyamides, polyimides, polytetrafluoroethylene and copolymers of tetrafluoroethylene and hexafluoro-propylene and polyurethanes as sheets, fibres, foams, woven and non-woven fabrics and screening, and leather sheets. The substrates can be metallized before coating or treated with an adhesive. The polyamide-ester may be cured to the corresponding polyimide.