Miles Inc.

Bayer Corporation

Bayer Aktiengesellschaft

Aaron D Meltzer

Harald Pielartzik

Rick L Archey

Robert J Kumpf

Alexander Karbach

Douglas A Wicks

Rudiger Schubart

Gerhard Fennhoff

Klaus Kircher

Richard Weider

Ralf Hufen

Charles E Lundy

Raymond A Yourd

Erik H Jonsson

Gary W Munko

A block copolymer resin containing structural units conforming to ##STR1## and a method for its preparation are disclosed. Accordingly, the block copolymer is prepared by reactive blending of an ester-containing polyether sulfone with a polyester. The block copolymer resin thus produced is characterized by its homogeneous morphology. The high level of its mechanical properties makes the resin suitable for a variety of applications.

Polyethersulfone/polyester block copolymers and a process for their

A thermoplastic molding composition stabilized against .gamma.-rays and its application for manufacture of medical equipment is disclosed. The composition contains an aromatic polycarbonate and (i) dialkyl and/or dicycloalkyl monosulfides or polysulfides in an amount of 0.001 to 5 weight %, and optionally (ii) aliphatic or cycloaliphatic monoalcohols or polyalcohols or their derivatives in an amount of 0.001 to 2 weight % said percent being relative to 100 weight % of aromatic polycarbonate.

Radiation-resistant polycarbonates

Esters and polyesters which contain disulfide linkages were found to be effective stabilizers of polycarbonate resin. Accordingly, a polycarbonate composition containing disulfide esters, alone or as a coadditive with a polyether is rendered more resistant to the deterioration resulting upon exposure to gamma radiation.

Gamma-radiation-resistant polycarbonate composition

A thermoplastic copolycarbonate resin having improved low temperature impact strength and a process for the preparation of the resin are disclosed. Accordingly the structure of the copolycarbonate contains

Copolycarbonate having improved low-temperature impact strength

A gamma radiation-resistant polycarbonate-disulfide resin is disclosed. The incorporation of disulfide linkages in the structure of polycarbonate was found to enhance the resistance of the resin to the discoloration caused by exposure to gamma radiation. Accordingly, processes for the incorporation of disulfide linkages in the molecular backbone, as end-groups or as side chains are disclosed. The polycarbonate-disulfide resin may be used as a molding resin in the context of thermoplastic molding compositions as well as a stabilizing additive in polycarbonate resin.

A composition suitable for making coatings, binders and films and the process for the preparation of the composition are disclosed. Accordingly, nylon-1 which contains structural units conforming to ##STR1## where R and R' are organic radicals, and which contains an amount of unpolymerized NCO groups, is reacted with a monofunctional blocking agent to produce a first product. The resulting first product is then reacted with an isocyanate-reactive product to produce a second product. The second product is suitable for the preparation of films, binders and coatings.

Process for the preparation of crosslinked poly(isocyanates)

A thermosetting composition is prepared by reacting a highly crosslinked nylon-1 which contains structural units corresponding to ##STR1## where R is an organic radical with a isocyanate-reactive compound. In carrying out the reaction the molar ratio of carbonyl groups to NCO-reactive groups is about 0.5:1 to 20:1. Desirable properties characterize the reaction product thus prepared.

Thermoset compositions based on nylon-1

A two step process for the preparation of an ester group-containing polyether sulfone is disclosed. In the first step a dihalogenodiphenyl sulfone is reacted with excess amount of an aromatic dihydroxy compound and in a second step the reaction product is reacted with a dicarboxylic acid derivative. The excess amount of the aromatic dihydroxy compound is that amount which is sufficient to react with said derivative to form the corresponding ester. The process of the invention is characterized by its economics and good yield and by the high purity of the product. The thus produced polyether sulfone is useful as a thermoplastic resin and as a reactant in the melt blending process for the preparation of block copolymers.

Process for making an ester containing polyether sulfone

An improvement in the process of preparing nylon-1 by the polymerization of isocyanates is disclosed. Accordingly, the improvement comprising using in the process a catalyst conforming to

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Pittsburgh, PA, United States of America

Aaron D Meltzer