Abstract: Large acrylic star polymers, are made by group transfer polymerization techniques by arm-first, core-first, or arm-core-arm approaches.

Abstract: N,N-disubstituted acrylamides are polymerized at temperatures from about -80.degree. to 100.degree. centigrade by anionically initiated polymerization to provide homogeneous polymerization by employing a solvent containing from about 25 to 100 weight percent of a pyridine type compound. Homopolymers or block polymers may be obtained.

Abstract: Large acrylic star polymers, having a low polydispersity of polymer molecular weight and of arm molecular weight and containing multifunctional monomers in the core.

Abstract: Large acrylic star polymers, having a low polydispersity of polymer molecular weight and of arm molecular weight and containing single- and multi-functional monomers in the core.

Abstract: ABA block copolymers containing N,N-disubstituted acrylamides in the A blocks and butadiene polymer in the B block provides thermoplastic elastomer adhesives or compatibilizing agents for polymer blends.

Abstract: There is disclosed a non-toxic physiologically-acceptable polymeric composition comprised of water insoluble, non-crosslinked polymeric compounds having a solubility parameter of between 9.2 and 15.5 (cal/cc).sup.1/2 dissolved in a polar, non-toxic water miscible solvent, which polymeric composition solidifies when placed in contact with living tissue by absorbtion of water and by gradual release of solvent into the surrounding tissue.

Abstract: Water soluble block copolymers having two or more water soluble polymer blocks useful for controlling the viscosity of aqueous media used in enhanced oil recovery techniques are described.

Abstract: A novel terminally functional (i.e., telechelic) polymers having a polyisobutylene are described. The end groups are styryl and can be reacted with conventional monomers to form copolymers having unique physical properties. Copolymerizations with N-vinyl-2-pyrrolidone produce amphiphilic polymers which are useful in the areas of medicine and agricultural chemicals.

Abstract: Lubricating oil additives having both dispersant and viscosity index-improving properties comprise a poly(polyalkenyl aromatic)nucleus, at least three hydrogenated conjugated diene homopolymer or copolymer arms linked to the nucleus, and at least one polymerized nitrogen containing polar compound arm linked to the nucleus.

Abstract: There is disclosed a process for producing a novel polymer composition comprised of a polyacrylonitrile polymer and a block copolymer with acrylonitrile and non-crystalline polymer sequences wherein the polymer composition is formed by the removal of a solvent from a solution of a polyacrylonitrile polymer and a block copolymer with acrylonitrile and non-crystalline polymer sequences.

Abstract: Lubricating oil additives having both dispersant and viscosity index-improving properties are prepared by contacting a star-shaped polymer having a poly(polyalkenyl aromatic) nucleus, at least three conjugated diene homopolymer or copolymer arms linked to the nucleus, and at least one polymerized nitrogen containing polar compound arm linked to the nucleus, with a rectant selected from p-toluenesulfonylhydrazide and hydrazine under conditions wherein the reactants release H.sub.2 N.sub.2, which adds across the residual double bonds in the polymer therein hydrogenating the aliphatic unsaturation and releasing N.sub.2 gas.

Abstract: There is disclosed a process for producing a novel polymer composition comprised of a polyacrylonitrile polymer and a block copolymer with acrylonitrile and non-crystalline polymer sequences wherein the polymer composition is formed by the removal of a solvent from a solution of a polyacrylonitrile polymer and a block copolymer with acrylonitrile and non-crystalline polymer sequences.

Abstract: There is disclosed novel block copolymers formed of acrylonitrile sequences and sequences containing at least about 50 mole percent of acrylamide units and at most about 50 mole percent organo-substituted amide units and formed by reacting a block copolymer having acrylonitrile sequences and sequences of glutarimide units with a low molecular weight compound having a functional group selected from the group consisting of primary amino and secondary amino group. The reaction is effected at a pH of about 7.5 and higher, preferably in the presence of a solvent and/or swelling agent.

Abstract: There is disclosed block copolymers having acrylonitrile sequences and sequences of glutarimide units of a molecular weight of from about 10,000 to about 2,000,000 where the acrylonitrile sequences and sequences including glutarimide units are of a molecular weight of at least about 400 with the number of sequences being at least about 2 and preferably 5 and higher.

Abstract: Polymeric material comprising at least four polymeric constituents which comprise mer units of the following types:I acrylamide or derivatives thereofII acrylonitrile or derivatives thereofIII acrylic acid and esters, or derivatives thereofIV alkylol, sulphonyl or phosphonyl derivatives of I.The polymeric materials are useful as components of water bearing systems which are in the form of gels or suspensions.

Abstract: There is disclosed novel block copolymers formed of acrylonitrile sequences and sequences containing at least about 50 mole percent of acrylamide units and at most about 50 of units selected from the group consisting of carboxyl, ester, amide, hydrazide and hydroxylamide units and formed by reacting a block copolymer having acrylonitrile sequences and sequences of glutarimide units with a low molecular weight compound having a functional group selected from the group consisting of hydroxyl, primary amino, secondary amino, hydrazo and hydroxylamino group. The reaction is effected at a pH of about 7.5 and higher, preferably in the presence of a solvent and/or swelling agent.

Abstract: There is disclosed block copolymers having acrylonitrile sequences and sequences of glutarimide units of a molecular weight of form about 10,000 to about 2,000,000 where the acrylonitrile sequences and sequences including glutarimide units are of a molecular weight of at least about 400 with the number of sequences being at least about 2 and preferably 5 and higher.

Abstract: Compatibilized polymer blends are described comprising a blend of olefin polymer, nitrile rubber, and a compatibilizing amount of block copolymer comprising nitrile rubber compatibilizing segments and olefin polymer compatibilizing segments.