Institut Francais Du Pe'trole

Centre D'etude Des Materiaux Organiques Pour Technologies Avancees

Michel Senneron

Bernard Sillion

Guy Rabilloud

Choua Cohen

Jacques Denis

Paul Mariaggi

Gilbert Parrain

Annie Dussart-Lermusiaux

Expanded material obtained by heating a composition comprising at least one hermosetting nadimide resin, said heating being performed at a temperature and during a period which are sufficient to cause the expansion of said composition by release of cyclopentadiene. A nadimide resin of the polyimide type and having a number average molecular weight of 600 to 10,000 is preferably used. The composition further comprises preferably 1% to 50% by weight of a linear, preferably thermostable polymer.

Expanded materials with nadimide resin base

Oligomer compositions of polyaryloxypyridine with acetylenic end groups are btained by formation of an oligomer composition of polyaryloxypyridine with halogenated end groups from an alkaline diphenolate and a dihalogenopyridine, followed with an ethynylation reaction. The average polycondensation degree may range from 1 to 50. Theses compositions can be used to form cross-linked lattices by polyaddition of the ethynyl groups.

Oligomer compositions of polyaryloxypyridines with acetylenic end

Aromatic polyimide compositions, useful in particular for manufacturing adhesive materials, varnishes and films withstanding high temperatures, having a high solubility in organic solvents, particularly polar solvents and which are manufactured by reacting, in such a solvent, a tetraester or diacid-diester of benzhydrol 3,3', 4, 4' tetracarboxylic acid with an aromatic diamine for a sufficient time to obtain a polycondensation reaction product having an inherent viscosity at 30.degree. C., at a concentration of 5 g/liter in N-methyl pyrrolidone, ranging from 0.1 to 2 dl/g.

Aromatic polyimide compositions of high solubility and their uses

An additive composition having a dispersing effect in lubricating oils is obtained by reacting at least one substituted succinic anhydride with at least one alkylphenol and with hexamethylene tetramine, preferably in respective proportions of from 1 to 2 moles of substituted succinic anhydride per mole of the alkylphenol and from 1.2 to 2 amino equivalents of hexamethylene tetramine per mole of the substituted succinic anhydride.

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Meylan, France

Michel Senneron