Abstract: The invention relates to a cross-linked, water-absorbent polymer obtainable by the polymerization of a mixture consisting of a) 60-99%-wt. unsaturated, polymerizable monomers with acid groups which are neutralized to the extent of at least 30 mol-%, b) 0-37%-wt. monomers copolymerizable with a), c) 0.1-3.0%-wt. of a cross-linking agent and d) 0-10%-wt. of a water-soluble polymer, in which polymerization is conducted with a redox catalyst system containing formamidine sulfinic acid as reducing agent. The polymer is distinguished by a retention of greater than or equal to 28 g 0.9% aqueous NaCl-solution per 1 g of polymer, an absorption of greater than or equal to 26 g 0.9% aqueous NaCl-solution per 1 g of polymer at a load of 20 g/cm.sup.2 and a residual monomer content of less than 700 ppm, and preferably less than 500 ppm. The invention also relates to the use of this polymer in the production of hygiene articles.

Abstract: Disclosed is a free radical polymerization process for the preparation of a thermoplastic resin or resins comprising heating a mixture of a free radical initiator, a stable free radical agent, and at least one polymerizable monomer compound to form a thermoplastic resin or resins with a high monomer to polymer conversion; cooling said mixture; optionally isolating the thermoplastic resin or resins; and optionally washing and drying thermoplastic resin or resins.Related free radical processes are also disclosed for the preparation of mixtures and block copolymer thermoplastic resins. Resins prepared by the disclosed processes possesses a narrow polydispersity and a modality that is controlled by the selection of a free radical initiator and stable free radical agent addition step or steps.

Abstract: The present invention discloses an alkylidenenorbornene polymer comprising as the essential constituent at least one kind of the structural unit represented by the formula ##STR1## wherein R.sub.1 denotes an alkyl group of 1-4 carbon atoms and R.sub.2 denotes a hydrogen atom or an alkyl group of 1-5 carbon atoms, and a process for producing the same.According to the present invention, an alkylidenenorbornene polymer is obtained which is excellent in light resistance, transparency, heat resistance and moisture resistance and is useful as an optical polymeric material.

Abstract: Odorless functional (co)polymers are prepared by polymerizing, for example via aqueous emulsion, bulk or organic solution polymerization, at least one olefinically unsaturated monomer, e.g.

Abstract: A homogeneous, random interpolymer of ethylene and an alpha-olefinically unsaturated carboxylic acid or ester having a melt flow rate in the range of about 0.1 to about 300 g/10 minutes, as determined by ASTM D-1238 (190.degree. C./2160 g), is improved during its manufacture when made in a substantially constant environment in a stirred autoclave under substantially steady-state conditions of temperature, pressure, and flow rates, said temperature and pressure being sufficient to produce a single phase reaction, using a free-radical initiator, said improvement being obtained by the use of a minor amount of a telogenic modifier in the reaction mixture, the process being further characterized by the use of either, or both, of (a) a temperature which is lower than that which would be required without the presence of the telogen, or (b) a pressure which is higher than that which would be required without the presence of the modifier.

Abstract: An improved solution polymerization process is provided wherein vinyl monomers are polymerized in the presence of at least one reactive modifier which is a substituted alpha-olefin that incorporates at least three ether groups, is hydrophilic, and has a molecular weight of at least about 200. The modified vinyl polymers so produced are characterized by various improved physical properties including, in particular, electrical characteristics such as antistatic capacity.

Abstract: This invention relates to novel reactive amino or hydrazino peroxides (hereinafter generally referred to as "AHP's") and derivatives all having a Structure A: ##STR1## in which the definitions of P, R11, R22, X, Q and x, y and z are given in the Summary Of The Invention section, for example, 4,4-di-(t-butylperoxy)pentanohydrazide (I-1), and the use of these novel compounds in curing unsaturated polyester resins, in initiating polymerization of ethylenically unsaturated monomers, for modifying rheology, for crosslinking and curing olefin polymers and elastomers, for producing novel graft and block copolymers, and for producing novel polymers with covalently bound performance additive functions.

Abstract: Polychloroprene polymers having stable viscosities and good scorch resistance, as well as excellent mechanical and dynamic properties in vulcanized state, are prepared by polymerizing chloroprene in alkaline aqueous emulsion, in the presence of a free-radical initiator and a combination chain-transfer agent including (1) at least one xanthogen disulfide and (2) at least one bis(acylaminophenyl)polysulfide.

Abstract: Disclosed herein is a process for suspension polymerization of a vinyl polymer which comprises using as the suspending agent a polyvinyl ester polymer having an ionic group at an end thereof or a polyvinyl alcohol polymer having a degree of hydrolysis of 90 mol % or less which is obtained by hydrolysis of the above polyvinyl ester polymer.According to the above-mentioned process, vinyl polymer granules having a sharp granulometric dispersion, high bulk density, high plasticizer absorption and low vinyl monomer residue are obtained.

Abstract: A method is provided for the direct synthesis of novel polymeric materials functionalized with desirable nitrogen-containing functional groups such as terminal azido, cyano, carbonylamino or thiocarbonylamino groups. Polymerization and functionalization occur in a substantially simultaneous manner. All necessary reactants for the functionalization are present when polymerization is initiated. The nitrogen-containing functional group is provided as a part of a molecule having a release moiety which is preferably resonance stabilized or of tertiary alkyl type and which acts to aid the nitrogen-containing species in functioning as a leaving group.

Abstract: Disclosed is a free radical polymerization process for the preparation of a thermoplastic resin or resins comprising heating a mixture of a free radical initiator, a stable free radical agent, and at least one polymerizable monomer compound to form a thermoplastic resin or resins with a high monomer to polymer conversion; cooling said mixture; optionally isolating the thermoplastic resin or resins; and optionally washing and drying thermoplastic resin or resins.Related free radical processes are also disclosed for the preparation of mixtures and block copolymer thermoplastic resins. Resins prepared by the disclosed processes possesses a narrow polydispersity and a modality that is controlled by the selection of a free radical initiator and stable free radical agent addition step or steps.

Abstract: Polymers having amine sulfide terminal moieties are provided. The amine sulfide terminal moieties are imparted by using aminethiols as chain transfer agents in aqueous addition polymerizations.The polymers are useful as mineral dispersants, as water-treatment additives for boiler waters, cooling towers, reverse osmosis applications, sugar refining, paper production, geothermal processes and oil wells, and as detergent additives acting as builders, anti-filming agents, dispersants, sequestering agents and encrustation inhibitors.

Abstract: A plastic light conduit of cross-linked polymer material having good light transmitting characteristics, without voids or noticeable bubbles, is disclosed. Also disclosed is a method of manufacture and an apparatus, involving progressive heating of reactive monomer mixture in a tube which is submerged in a progressive reactor utilizing cold oil to maintain a cold, non-reacting zone, and hot water to create a hot zone that causes reaction, while simultaneously carrying away the excess exothermic heat of reaction.

Abstract: There is disclosed a process for producing an acrylamide polymer which comprises polymerizing acrylamide monomer alone or a monomer mixture composed of 50 mole % or more of acrylamide monomer and a monomer capable of copolymerizing with acrylamide monomer in the presence of an azo series polymerization initiator and 0.1% by weight or more of 2-mercaptobenzothiazole or a salt thereof based on the weight of the monomer in an aqueous medium having a pH of 6 or higher at a temperature range of 5 to 100.degree. C., and then drying the resulting material.

Abstract: A cyanoacrylate monomer adhesive formulation which has improved thermal properties resulting from the inclusion in the formulation of an effective amount for enhancing the thermal resistance of the cured polymer of a mono, poly or hetero aromatic compound characterized by at least three substitutions on an aromatic ring thereof, two or more of said substitutions being electron withdrawing groups selected from the group consisting of NO.sub.2, CN, CF.sub.3, NR.sup.1.sub.3.sup.+, SR.sup.1.sub.2.sup.+, C(.dbd.O)R.sup.1, C(.dbd.O)OR.sup.1, NO, CCl.sub.3, SO.sub.2, S(.dbd.O), SO.sub.3, SO.sub.2 R.sup.1, SO.sub.2 OR.sup.1 and F, one or more of said substitutions being leaving groups selected from the group consisting of F, Br, Cl, I, NO.sub.2, CN, SOR.sup.1, SO.sub.2 R.sup.1 and SO.sub.2 OR.sup.1, and R.sup.1 is an optionally substituted hydrocarbon group. Example such compounds have the formula: ##STR1## where L is the leaving group and the W groups are the electron withdrawing groups.

Abstract: Pure syndiotactic 1,2-polybutadiene is a thermoplastic resin which has double bonds attached in an alternating fashion to its polymeric backbone. Films, fibers and molded articles can be made utilizing syndiotactic 1,2-polybutadiene. It can also be blended into rubbers and cocured therewith. Syndiotactic 1,2-polybutadiene can be made by solution, emulsion or suspension polymerization. It typically has a melting point which is within the range of about 195.degree. C. to about 215.degree. C. However, it is often desirable for the syndiotactic 1,2-polybutadiene to have a melting point of less than about 195.degree. C. This invention discloses a process for preparing syndiotactic 1,2-polybutadiene having a melting point of less than about 195.degree. C.

Abstract: The process of producing a stable polymer dispersion by aqueous emulsion polymerization of an ethylenically unsaturated monomer in the presence of a stabilizer selected from a polyester or polyamide containing a sulfate or sulfonate group.

Abstract: A polymerization method carried out in the presence of unsaturated hydroperoxides useful as molecular weight regulators, is disclosed. Also disclosed are polymers and oligomers made by this process and articles of manufacture comprising one or more polymers or oligomers made by this process. These molecular weight regulating hydroperoxides provide the ability to introduce an epoxy functionality to the oligomer or polymer as well as an additional functionality and a primary hydroxy group. Further, omega substituted or alpha, omega disubstituted polymers may be synthesized using the unsaturated hydroperoxides of the present invention.

Abstract: Substantially alternating 1:1 copolymers of olefinically unsaturated sulfonate salts such as sodium methallylsulfonate and .alpha., .beta.-unsaturated aliphatic dicarboxylic acid anhydrides such as maleic anhydide are produced by free radical polymerization using a polar non-reactive organic solvent such as acetic acid. The copolymers and their derivatives are useful as water-soluble dispersants.

Abstract: Excellent resolution and sensitivity in the patterning of resists utilized in device and mask manufacture is obtained with a specific composition. In particular this composition involves polymers having recurring pendant acid labile .alpha.-alkoxyalkyl carboxylic acid ester moieties in the presence of an acid generator activated by actinic radiation such as UV-visible, deep ultraviolet, e-beam and x-ray radiation.

Abstract: A copolymer of the present invention is produced by copolymerization of an electron-donating monomer having an electron-accepting group and an electron-accepting monomer having an electron-accepting group. The copolymer thus exhibits a high dielectric constant, a low level of hygroscopicity and good adhesion.

Abstract: Odorless, aqueous copolymer dispersions are produced by emulsion copolymerizing a comonomer recipe which comprises at least 60% by weight of styrene and/or butadiene and/or an acrylic ester and/or a vinyl nitrile, and, optionally, up to 40% by weight of at least one other copolymerizable comonomer, in an aqueous medium of copolymerization, in the presence of an alkoxy, aryloxy, acyloxy or acylamino substituted diphenyl disulfide chain transfer agent.

Abstract: A process of preparing a copolymer of vinyl monomer such as vinyl acetate, vinyl propionate and vinyl trifluoroacetate, and of fluorinated monomers such as tetrafluoroethylene and trifluoroethylene, said copolymer having an alternating or substantially alternating distribution of vinyl recurring monomeric units and fluorinated recurring monomeric units in the copolymer backbone which comprises copolymerizing said monomers in an aqueous reaction medium comprising water and a water miscible organic co-solvent in an amount less than the amount sufficient to form a distinct organic co-solvent phase.

Abstract: A process for producing a macromolecular monomer, which comprises anionic polymerization of a (meth)acrylic acid ester monomer by using, as a polymerization initiator, a compound represented by the following general formula [I]: ##STR1## wherein M.sup.+ is a quaternary ammonium ion; .phi.is a phenylene group; R.sub.1 and R.sub.2 are each an electron withdrawing group stabilizing the carbanion C.sup.-, or one of them is said electron withdrawing group and the other is an alkyl group of 1-6 carbon atoms or a phenyl group; and n is an integer of 0-6.

Abstract: This invention relates to a process for the radical homo-or copolymerization of acrylonitrile with one or more copolymerizable monomers under reaction conditions such that the monomers are present predominantly in a gaseous form of an adsorbed form and polymerization of the monomers, which are presumably adsorbed, takes place in the solid phase (solvent-free polymerization) and results in pulverulent PAN-(co)polymers. The process is preferably carried out in the presence of small quantities of a mediator substance such as dimethylformamide which does not alter the pulverulent consistency of the PAN-polymers but leads considerably more rapidly and with much improved yields to freshly formed polyacrylonitrile polymers.

Abstract: Organic dispersion polymers based on ethylenically unsaturated, polymerizable or copolymerizable monomers which are prepared in the presence of protective colloids or of protective colloids and emulsifiers by emulsion, suspension or bead polymerization or copolymerization, initiated by free radicals, in an aqueous medium and are present in aqueous dispersion form or in finely dispersed dry powder form and which contain, as protective colloids, preferably 0.

Abstract: The solution pertains to hydrolytically degradable hydrophilic gels consisting of the individual chains of hydrophilic polymer interconnected with crosslinks containing the structure ##STR1## The method for preparation of the hydrolytically degradable gels consists in subjecting hydrophilic monomers or their mixture to the radical polymerization or copolymerization, or to copolymerization with hydrophobic monomers, in the presence of a new compound--N,O-dimethacryloylhydroxylamine--as a crosslinking agent, and, if desired, in the presence of a solvent, whereas the amount of hydrophilic monomers is 50 to 99.8 molar percent related to all monomers present.

Abstract: An acrylonitrile polymer film is disclosed which film comprising a polymer containing higher than 80% by weight of acrylonitrile units, having higher than 300,000 of weight average molecular weight, and having molar fraction Ne for the segment of polymerization initiator bonded to the terminal of the polymer satisfying the following equation:Mw.times.Ne.ltoreq.

Abstract: Dispersion polymers of ethylenically unsaturated monomers which are prepared in the presence of protective colloids and if appropriate emulsifiers by polymerization in an aqueous medium and are present in aqueous dispersion form or in finely dispersed dry powder form. They contain, as protective colloids, water-soluble graft polymers containing vinyl alcohol units on a polyurethane grafting base, the polyurethane grafting bases containing at least 2 urethane groups in the molecule prepared by reacting diisocyanates and diols, and polymer radicals of units of carboxylic acid vinyl esters having 3 to 20 carbon atoms and/or hydrolysis products thereof and if appropriate units of other ethylenically unsaturated monomers and/or hydrolysis products thereof being grafted onto the polyurethane grafting bases.

Abstract: Heterocyclic thiol sulfenimide compounds are useful as an accelerator in the curing of natural and/or synthetic rubbers. The compound can be represented by the formula ##STR1## wherein each of A.sup.1 and R.sup.2, independently, is at least one heterocyclic ring containing one or more nitrogen atoms therein, or at least one heterocyclic ring containing one or more nitrogen atoms therein and (1) one or more hydrocarbyl substituents, or (2) one or more electron withdrawing groups, or (3) one or more electron releasing groups, wherein A.sup.

Abstract: A method for producing ethylene copolymer using ethylene and at least a comonomer of unsaturated glycidyl monomer in the presence of a polymerization initiator, wherein the undesirable thermal polymerization of the unsaturated glycidyl monomer in the preparation system can be avoided and the operation can be continued for a long period of time in a stable condition. The method is characterized in that at least two kinds of polymerization inhibitors are used and the inhibition factor of one polymerization inhibitor added to the unsaturated glycidyl monomer is smaller than that of another polymerization inhibitor added to the lubricating oil for compressors and the unsaturated glycidyl monomer containing 100 to 2000 ppm of a polymerization inhibitor is introduced from the inlet side of a high pressure compressor into the reaction system and the lubricating oil containing 0.1 to 10% by weight of a polymerization inhibitor is used for the high pressure compressor.

Abstract: Compositions containing sulfuric acid and one or more of certain chalcogen-containing compounds in which the chalcogen compound/H.sub.2 SO.sub.4 molar ratio is below 2 contain the mono-adduct of sulfuric acid which is catalytically active for promoting organic chemical reactions. Suitable chalcogen-containing compounds have the empirical formula ##STR1## wherein X is a chalcogen, each of R.sub.1 and R.sub.2 is independently selected from hydrogen, NR.sub.3 R.sub.4, and NR.sub.5, at least one of R.sub.1 and R.sub.2 is other than hydrogen, each of R.sub.3 and R.sub.4 is hydrogen or a monovalent organic radical, and R.sub.5 is a divalent organic radical. Such compositions are useful for catalyzing organic reactions such as oxidation, oxidative addition, reduction, reductive addition, esterification, transesterification, hydrogenation, isomerication (including racemization of optical isomers), alkylation, polymerization, demetallization of organometallics, nitration, Friedel-Crafts reactions, and hydrolysis.

Abstract: A polychloroprene of sol type, the latices and solutions of which are gel free, exhibit improved rheological and other properties and are useful in the formulation of adhesive compositions, is readily prepared by polymerizing chloroprene in aqueous emulsion in the presence of X and Y chain transfer agents, said X chain transfer agent being present upon initiation of the polymerization and having a relative reaction velocity greater than that of chloroprene, and said Y chain transfer agent being incrementally or continuously added to the polymerization reaction medium over the course of the polymerization reaction and having a relative reaction velocity essentially the same as that of chloroprene.

Abstract: (Meth)acrylic ester formulations employing peroxy initiators have accelerated cure rates when the substrates to which they are applied, or the compositions themselves, include xanthate, dithiocarbamate or dithiophosphate salts of transition metals together with a sulfimide or similar co-accelerator compound.

Abstract: A method of preventing polymer scale formation in a polymerization vessel during the polymerization of a monomer having an ethylenically double bond, wherein said polymerization is carried out in a polymerization vessel in which its inner wall surface has been previously coated with a coating solution containing (A) at least one member selected from the group consisting of particular anionic dyes, and alkali metal salts and ammonium salts of a sulfonated product obtained by sulfonation of a condensate of a particular aromatic amine compound with a particular aromatic nitro compound, and (B) a particular cationic dye and having a pH of more than 7, and then dried to form a coating. This method can effectively prevent scale formation in the polymerization of extensive monomers having an ethylenically double bond, so that 100 or more polymerization runs can be repeated without formation of polymer scale.

Abstract: A method is provided for the direct synthesis of novel polymeric materials functionalized with desirable nitrogen-containing functional groups such as terminal azido, cyano, carbonylamino or thiocarbonylamino groups. Polymerization and functionalization occur in a substantially simultaneous manner. All necessary reactants for the functionalization are present when polymerization is initiated. The nitrogen-containing functional group is provided as a part of a molecule having a release moiety which is preferably resonance stabilized or a tertiary alkyl type and which acts to aid the nitrogen-containing species in functioning as a leaving group.

Abstract: A finely divided gelled polymer obtained by emulsion polymerizing(a) a polymerizable monomer containing at least two radially polymerizable unsaturated groups in the molecule, and(b) a radically polymerizable unsaturated monomer other than the one mentioned in (a), abovein the presence of a reactive emulsifier containing an allyl group in the molecule.A process for producing a finely divided gelled polymer which comprises emulsion polymerizing(a) a polymerizable monomer containing at least two radically polymerizable unsaturated groups in the molecule, and(b) a radically polymerizable unsaturated monomer other than the one mentioned in (a), above in the presence of a reactive emulsifier containing an allyl group in the molecule, characterized by using a water-soluble azoamide compound as a polymerization initiator.

Abstract: The present invention relates to amides of formula I ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are each independently hydrogen or methyl, m is 1 to 5 and n is 1 to 5 and R.sup.4 is --NH.sub.2 or is derived from a mono- to pentavalent amine.Intermediates of formula VIII ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and m are as defined above and X is a carboxylic acid or acid ester group, --COCl, --COBr, --CHO or --CN, are also described.The compounds of formula I can be polymerized thermally. They are suitable for the preparation of adhesives, matrix resins or electrical insulating materials.

Abstract: A homogeneous, random interpolymer of ethylene and an alpha-olefinically unsaturated carboxylic acid or ester having a melt flow rate in the range of about 0.1 to about 300 g/10 minutes, as determined by ASTM D-1238 (190.degree. C./2160 g), is improved during its manufacture when made in a substantially constant environment in a stirred autoclave under substantially steady-state conditions of temperature, pressure, and flow rates, said temperature and pressure being sufficient to produce a single phase reaction, using a free-radical initiator, said improvement being obtained by the use of a minor amount of a telogenic modifier in the reaction mixture, the process being further characterized by the use of either, or both, of (a) a temperature which is lower than that which would be required without the presence of the telogen, or (b) a pressure which is higher than that which would be required without the presence of the modifier.

Abstract: A radiation curable pressure sensitive adhesive composition comprising:(A) 100 parts by weight of a hydrogenated polybutadiene liquid oligomer which has one or more ethylenically unsaturated terminal radicals in its molecule and in which 70% or more of intramolecular carbon-carbon double bonds has been hydrogenated;(B) from 0.2 to 20 parts by weight of a chain transfer agent; and(C) from 0.001 to 1.0 parts by weight of a thermal polymerization inhibitor selected from metal complexes of N-nitrosophenylhydroxylamine;has an excellent storage stability and curing property and can provide pressure sensitive adhesive tapes which have excellent heat resistance and weatherability and are suitably used as surface protecting films.

Abstract: The invention relates to telechelic polymers based on radically polymerized, ethylenically unsaturated monomers which are obtained by polymerization by means of thiuram disulfides and dithiocarbamates, which have one or several additional functional reactive groups in addition to the carbamate group. The invention furthermore relates to the manufacture of the said type of telechelic polymers and to the use thereof, for example, as reactive precursors in higher-polymer linear or cross-linked products, especially as components of aqueous solutions, emulsions, dispersions, and suspensions for the preparation of coatings.

Abstract: The combination of unmodified resinic acids and direct peptization in the production of sulfur-modified polychloroprene leads to a favorable ratio of elasticity to viscosity.

Abstract: Water-soluble copolymers having a K value of from 8 to 100 (determined on the Na salt of the copolymers according to H. Fikentscher in aqueous solution at 25.degree. C., at a pH of 7 and at a concentration of the Na salt of the polymer of 1% by weight) are prepared by copolymerization of monomer mixtures of(a) from 98.5 to 18.5 mol % of one or more monoethylenically unsaturated C.sub.3 -C.sub.6 -monocarboxylic acids,(b) from 1.5 to 20 mol % of one or more comonomers which contain two or more ethylenically unsaturated, nonconjugated double bonds which are separated from one another by one or more ester bonds,(c) from 0 to 80 mol % of one or more monoethylenically unsaturated C.sub.4 -C.sub.

Abstract: Toluene-soluble, sulphur-modified polychloroprene is obtained by emulsion copolymerization of chloroprene, sulphur and optionally further monomers which are copolymerizable with chloroprene and sulphur using a peroxy activator and subsequent working-up by stabilizing, stopping, degassing and isolating without separate peptization, in that polymerization is carried out in the presence of dithiocarbamates and/or xanthogenates and the activator is metered in continuously or batch-wise during the course of polymerization.

Abstract: Isobutylene polymers having functional terminal end groups are prepared by polymerizing a cationic polymerizable monomer containing isobutylene by using:(A) as an initiator and chain transfer agent, an organic compound represented by the general formula (I): ##STR1## where X represents a halogen atom or RCOO-- group (in which R represents a hydrogen atom or a monovalent organic group), R.sup.3 represents a (n+1)-valent hydrocarbon group, R.sup.1, R.sup.2 represent respectively hydrogen atom or monovalent hydrocarbon group, R.sup.1 and R.sup.2 may be identifical or different with each other, R.sup.1 and R.sup.2 are not hydrogen atom in a case while R.sup.3 is an aliphatic hydrogen group, n is a positive integer;(B) as a catalyst, a Lewis acid; and(C) as a solvent, a hydrocarbon or halogenated hydrocarbon containing an organonitro compound.

Abstract: Storage-stable polychloroprene is obtained, using a polymerization initiator comprising a mixture of(1) a redox system comprising(a) a reducing agent selected from the group consisting of(i) sodium dithionite,(ii) formamidine sulphinic acid, and(iii) a mixture from (i) and (ii),(b) potassium peroxodisulphate as an oxidizing agent and, optionally,(2) sodium anthraquinone-.beta.-sulphonate as a co-activatorin the presence of oxygen, wherein from 10 to 90 by weight of the initiator are present at the commencement of polymerization and the remainder is added during the polymerization, and after a certain degree of conversion the reducing agent is the only component of redox system (1) which remains to be added.

Abstract: The invention relates to modified polymers based on polyvinylene carbonate and/or polyhydroxymethylene, the modification being effected by particular alkoxylated compounds incorporated into the polymer. These polymers, for the preparation of which, according to the invention, particular dispersion stabilizers are used, are suitable, inter alia, as carriers for biologically active substances or for affinity chromatography.

Abstract: An improved process for the preparation of polychloroprene by the emulsion (co)polymerization of chloroprene and optionally other monomers capable of copolymerization with chloroprene, using a peroxo activator, and subsequent working up of the product by stopping the reaction, stabilizing, degassing and isolating the product, characterized in that polymerization is carried out in the presence of dithiocarbamates and/or xanthates and 0 to 0.5% by weight of sodium .beta.-anthraquinone sulphonate.

Abstract: (1) Pyrrolidonyl acrylate block polymers having the formula ##STR1## wherein n has a value of 1 to 3; X and X' are dissimilar and each is hydrogen or methyl; y and z each have a value of from 1 to 40, except that at least one of y and z is greater than 1 and R is hydrogen or methyl;(2) preparation of said polymers and(3) uses of said polymers.

Abstract: Sulfur-modified polychloroprene in alkaline aqueous emulsion is prepared by incorporating one or more organic polysulfides which act as peptizing agents during the polymerization of the chloroprene. The sulfur-modified polychloroprenes obtained have stable viscosities.