Back to results
US 4,398,009 AGranted
Polyoxazole precursor and the preparation thereof
AssigneeSiemens Aktiengesellschaft
InventorsHellmut Ahne, Eberhard Kuhn, Roland Rubner
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSiemens Aktiengesellschaft
InventorsHellmut Ahne, Eberhard Kuhn, Roland Rubner
Estimating the term…
The invention relates to oligomeric and/or polymeric precursor stages of polyoxazoles, as well as to a method for the preparation of these precursor stages. New radiation-reactive polymer precursor stages are provided comprised of addition products of olefinically unsaturated monoepoxides on hydroxyl group-containing polycondensation products of aromatic and/or heterocyclic dihydroxy diamino compounds with dicarboxylic-acid chlorides or esters. The radiation-reactive precursor stages according to the invention are suitable, for example, for the preparation of highly heat-resistant relief structures and as coatings for the optical fibers of light waveguides.
A polyoxazole precursor selected from the group consisting of an oligomeric and a polymeric precursor comprising the addition product of (a) an olefinically unsaturated 1,2-monoepoxide and (b) an hydroxyl group-containing polycondensation product of (1) a member selected from the group consisting of an aromatic dihydroxydiamino compound and a heterocyclic dihydroxydiamino compound with (2) a member selected from the group consisting of a dicarboxylic acid chloride and an ester of a dicarboxylic acid.
A method for the preparation of a polyoxazole precursor comprising reacting (1) a member selected from the group consisting of an aromatic dihydroxydiamino compound and a heterocyclic dihydroxydiamino compound with (2) a member selected from a dicarboxylic acid chloride and an ester of a dicarboxylic acid to form a hydroxyl group-containing polycondensation product, and reacting said polycondensation product with an olefinically unsaturated 1,2-monoepoxide in an organic solvent at a temperature of up to about 100.degree. C.
Dependencies are inferred from the claim text.