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AssigneeBayer Aktiengesellschaft
InventorsTorsten Groth, Winfried Joentgen, Frank Dobert, Klaus-Peter Heise, Thomas Menzel, Ursula Pentling, Hans-Georg Pirkl, Paul Wagner, Joergen Weinschenck
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Polymers having recurring succinyl units are obtained by an improved process by reaction of A, an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof, with B, a nitrogen-donating compound, in a first reaction step to give a reaction mixture comprising at least one low molecular weight reaction product, and subsequent continuous feeding of the reaction mixture into a continuously operated reactor to give the polymer in a second reaction step. In a further embodiment the invention refers to polymers having recurring succinyl units prepared by reaction of an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof with a nitrogen-donating compound in a first reaction step and subsequent feeding of the reaction mixture, without intermediate isolation, into an optionally continuously operated reactor, with removal of water, and treatment of the reaction mixture at a temperature of 140 to 350.degree. C.
A process for the preparation of a polymer having recurring succinyl units comprising reaction of A, an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof, with B, a nitrogen-donating compound, in a first reaction step which is carried out discontinuously to give a reaction mixture comprising at least one low molecular weight reaction product of A and B and/or a prepolymer of A and B, and subsequent continuous feeding of the reaction mixture into a continuously operating reactor and treatment of the reaction mixture at a temperature of 140 to 350.degree. C. to give the polymer having recurring succinyl units and a molecular weight Mw>1300 in a second reaction step.
A process for the preparation of a polymer having recurring succinyl units comprising reaction of compound A, an unsaturated C.sub.4 -dicarboxylic acid or a derivative thereof, with compound B, a nitrogen-donating compound, in water in a first reaction step at a temperature of from 50 to 250.degree. C. to give a reaction mixture wherein the molar ratio of compound A to compound B is 1:1.5-25, and the water content of the reaction mixture is 35 to 95% by weight, based on the total reaction mixture, and further wherein at least 50% of compound A is reacted with compound B in said first reaction step, and subsequent to said first reaction step optionally continuously feeding the reaction mixture, without intermediate isolation, into an optionally continuously operated reactor, water being removed, and treatment of the reaction mixture at a temperature of 140 to 350.degree. C. in the reactor for a residence time of 0.5 minute to 48 hours to give the polymer having recurring succinyl units.
A polymer having recurring succinyl units and a molecular weight M.sub.w of from 1300 to 10,000, wherein said recurring succinyl units are selected from the group consisting of ##STR11## where R=ONH.sub.4, NH.sub.2 or one of the structures 1, 2, 3, 4, 5 or 6.
Dependencies are inferred from the claim text.