Abstract: This invention relates to polymer particles comprising monomer units of at least one reactive mesogen, a process for their preparation, the use of these particles for the preparation of optical, electrooptical, electronic, electrochemical, electrophotographic, electrowetting and electrophoretic displays and/or devices and security, cosmetic, decorative, and diagnostic applications, and electrophoretic fluids and displays.

Abstract: The invention relates to solid polyester granules of the type used as matting agents in paints. In particular, the invention relates to a new redox initiating system for use in a suspension polymerization process that is used to manufacture the solid polyester granules, to a process for the preparation of the solid polyester granules, and to paint compositions containing the solid polyester granules.

Abstract: Composition which contains polymerizable binder and an initiator according to the following Formula I: R1—X—O—O—[Y—O—O—-]nR2??(Formula I) and having a large through-curing depth and a sufficiently long processing time and which cures without the development of high temperatures.

Abstract: Disclosed are a maleimide-a-alkylstyrene-based, heat-resistant bulk tetrapolymer and a preparation process thereof. More specifically, disclosed are a bulk tetrapolymer, comprising 5-60 wt % of an N-substituted maleimide monomer, 10-70 wt % of an a-alkylstyrene monomer, 5-50 wt % of an unsaturated nitrile monomer and 3-50 wt % of an aromatic vinyl monomer, as well as a continuous bulk polymerization process for preparing the same. The disclosed bulk tetrapolymer has a weight-average molecular weight (Mw) of 70,000-300,000 and a glass transition temperature of 150-200 DEG C., shows excellent high-temperature thermal stability and heat resistance and a remarkably low melt viscosity, and thus is excellent not only in processability, but also in productivity, processability, moldability and blendability, when it is blended with other resins. Also, the continuous bulk polymerization process is equipped with a devolatilizer and enables the bulk tetrapolymer to be produced at low cost and high efficiency.

Abstract: The invention provides intermediates of the formula: as well as a method of their preparation by reacting a thiol having at least two hydroxyl groups with a mono-unsaturated organic compound in the presence of a base catalyst. A polymerizable urethane acrylate oligomer or urethane methacrylate oligomer is formed by reacting a polyisocyanate with the intermediate. The polymerizable urethane acrylate oligomer or urethane methacrylate is blended with a polymerization initiator to form a composition which is useful in such applications as adhesives.

Abstract: The present invention provides a reactive hydrophilic copolymer consisting essentially of units formed by ethylenically unsaturated hydrophilic monomers and units of formula (I) or (II) formed by ethylenically unsaturated monomers having alkoxy silane functional groups in a random order: wherein the copolymer has a molecular weight of at least 50,000, and wherein R1, R2 and R3 can be the same or different and are independently selected from H or C1-3 alkyl; R is C1-3 alkyl; X, Y and Z can be the same or different and are independently selected from R? or OR?, provided that at least one of X, Y and Z is OR?; R? is H or C1-3 alkyl; and the equivalent ratio of the units formed by ethylenically unsaturated hydrophilic monomers to the units of formula (I) or (II) is within the range of 5/1 to 200/1. The present invention also provides silicone hydrogel compositions comprising the reactive hydrophilic copolymer of the present invention and ocular articles made therefrom.

Abstract: Described herein are partially fluorinated elastomers and methods of curing comprising (i) a fluoroelastomer comprising interpolymerized units derived from (a) at least one hydrogen containing monomer and (b) at least one nitrile containing monomer, and (ii) a curing agent, wherein the curing agent consists essentially of a peroxide and a coagent.

Abstract: Golf ball components, such as cores, intermediate layers, and covers, formed with compositions including precursors with acrylate functionality crosslinked with a curing agent.

Abstract: The invention relates generally to solid polyester granules of the type used as matting agents in paints. In particular, the invention relates to a new redox initiating system for use in a suspension polymerisation process used to manufacture the solid polyester granules, to a process for the preparation of the solid polyester granules, and to paint compositions comprising solid polyester granules.

Abstract: A film forming composition is provided that includes (A) a radical polymerization initiator, and (B-1) a compound represented by Formula (1) below and/or a polymer polymerized using at least a compound represented by Formula (1) below, and/or (B-2) a compound represented by Formula (2) below and/or a polymer polymerized using at least a compound represented by Formula (2) below (in Formula (1), the two R1s denote groups consisting only of carbon and hydrogen, which may be identical to or different from each other, and may be linked to each other to form a 6- or higher-membered ring structure, and the R2s denote hydrogen atoms or are represented by Formula (3) below and may be identical to or different from each other provided that at least one of the R2s is represented by Formula (3)) (in Formula (2), the two R4s and the two R5s denote groups consisting only of carbon and hydrogen, which may be identical to or different from each other, R4 and R4, and R5 and R5 may be linked to each other to form a 6-

Abstract: A method for preparing reversibly cross-linked isotactic polypropylene having a degree of crystallinity substantially identical to a degree of crystallinity of a starting polypropylene by mixing in the presence of heat, a polymer of isotactic polypropylene homopolymer; isotactic polypropylene copolymer; mixtures of isotactic polypropylene homopolymer and copolymer with an elastomer, an organic peroxide, and an accelerator, forming macro-radicals; the simultaneously coupling the macro-radicals with a sulfur obtaining an optimum cross-linking degree and a product made by the method.

Abstract: There is provided a process for producing a vinyl chloride-based polymer, in which a suspension polymerization of either vinyl chloride monomer, or a mixture of vinyl chloride monomer and another copolymerizable monomer, is conducted in a polymerization vessel fitted with a reflux condenser, the process including the steps of: (A) adding to the reaction mixture a high-activity, oil-soluble polymerization initiator, with a 10-hour half life temperature of no more than 40° C. at a concentration of 0.

Abstract: A polymer comprises polymer chains having a glass transition temperature of less than 25° C. and a weight average molecular weight of less than 20,000 wherein the polymer chains contain at least one non-functional aromatic end-group. The polymer is miscible in the uncured state of said thermoset resins and immiscible in the cured state of the thermoset resins.

Abstract: A process for preparing a liquid rubber composition comprises: (a) Forming a reaction mixture of (i) from 1.0 to 99.999 weight percent of the reaction mixture of at least one C1-C20 alkyl acrylate monomer; and (ii) from 0.001 to 20 weight percent of the reaction mixture of at least one aromatic-containing initiator; (b) charging the reaction mixture into a reactor maintained at a reaction temperature of up to 400° C.; and (c) polymerizing said monomer with said aromatic-containing initiator to form a liquid rubber with polymer chains having at least one non-functional aromatic end-group.

Abstract: A method of synthesizing a CO2-philic analog of a CO2-phobic compound, includes the step of: reacting the CO2-phobic compound with a CO2-philic compound selected from the group of a polyether substituted with at least one side group including preferably a Lewis base, a polycarbonate, a polycarbonate substituted with at least one side group including preferably a Lewis base, a vinyl polymer substituted with at least one side group including preferably a Lewis base a poly(ether-ester) or a poly(ether-ester) substituted with at least one side group including preferably a Lewis base, to create the CO2-philic analog. A method of synthesizing a CO2-phile includes the step of copolymerizing at least two monomers, wherein a polymer formed from homopolymerization of one of the monomers has a Tg of less than approximately 250 K and a steric factor less than approximately 1.

Abstract: It has been discovered that certain compounds serve as polymerization accelerators when employed together with peroxide initiators for the polymerization of vinylaromatic monomers. Suitable accelerators that increase the rate of decomposition of the peroxide initiator include, but are not necessarily limited to, hydroperoxides and/or metallic salts. Representative examples of suitable hydroperoxide accelerators include t-butyl hydroperoxide (TBH), cumyl hydroperoxide, and p-isopropyl cumyl hydroperoxide, whereas suitable metallic salt accelerators include cobalt naphthenate and cobalt acetoacetonate. Use of these accelerators when vinylaromatic monomers are polymerized in the presence of polybutadienes and peroxide initiators results in an increase in grafting as compared with similar copolymers made without the accelerator.

Abstract: The invention relates to a method of forming carbon monoxide-containing polymers from multi-component syngas feeds and at least one vinyl comonomer. Feeds useful in the practice of the invention comprise ethylene in an amount ranging from about 5 to about 40 mole %, carbon monoxide is an amount ranging from about 1 to about 40 mole %, hydrogen in an amount ranging from about 4 to about 55 mole %, carbon dioxide in an amount ranging from about 3 to about 10 mole %, and methane in an amount ranging from about 4 to about 85 mole %. The feed may also include acetylene in an amount ranging up to about 10 mole %. The feed may contain at least one free radical-polymerizable vinyl comonomer, or a cofeed containing such a comonomer can be used.

Abstract: A radical (co)polymerization of ethylene is carried out under high pressure in the presence of at least one initiating free radical (Z&Circlesolid;) and of at least one controlling stable free radical (SFR&Circlesolid;) which comprises the indoline nitroxide backbone represented by the formula (I). Mention may be made, by way of examples, of the radicals (SFR&Circlesolid;) of formula (II).

Abstract: There is disclosed a method of producing a copolymer by polymerizing at least two monomers having different reactivity as constitutional components, comprising carrying out a polymerization while adding a monomer component B having high reactivity, to a solution of a monomer component A having low reactivity dissolved in a non-aqueous solvent having a boiling point of 55° C. to 120° C., in the presence of a polymerization initiator. The method can give a copolymer high in solubility and suitable for the processing by the flush vacuum dry system, and the method is excellent from the standpoint of the production capacity and stable/safe production throughout the process.

Abstract: Elastomeric composition vulcanizable with sulfur useful for the preparation of tyre treads which comprises:

Abstract: The invention relates to a method of forming carbon monoxide-containing polymers from multi-component syngas feeds and at least one vinyl comonomer. Feeds useful in the practice of the invention comprise ethylene in an amount ranging from about 5 to about 40 mole %, carbon monoxide is an amount ranging from about 1 to about 40 mole %, hydrogen in an amount ranging from about 4 to about 55 mole %, carbon dioxide in an amount ranging from about 3 to about 10 mole %, and methane in an amount ranging from about 4 to about 85 mole %. The feed may also include acetylene in an amount ranging up to about 10 mole %. The feed may contain at least one free radical-polymerizable vinyl comonomer, or a cofeed containing such a comonomer can be used.

Abstract: The invention relates to a process comprising a stage of polymerization or copolymerization of at least one polymerizable or copolymerizable monomer by a radical mechanism in the presence of a stable free radical and of an initiator of formula: R1—O—O—R2 wherein R1 and R2, which can be identical or different, represent an alkyl, aryl, alkylaryl or aralkyl radical comprising, for example, from 1 to 20 carbon atoms. The process is fast, allows the initiator to act more efficiently and results in polymers or copolymers exhibiting a low yellowing index.

Abstract: Acrylic, high refractive index ophthalmic device materials comprising an aryl acrylic monomer, a first stage polymerization initiator and a second stage cross-linking agent are prepared in a two-stage method. The monomers used to form the ophthalmic device materials do not contain cross-linking agents having more than one unsaturated bond. In the first stage of the method, the materials are polymerized. In the second stage, the materials are cross-linked by exposure to heat.

Abstract: The present invention is a process for producing a high molecular weight monovinylidene aromatic polymer, comprising free radically polymerizing a vinyl aromatic monomer in the presence of less than 10 ppm of a vinyl acid having a pKa at 25.degree. C. of less than 2.0.

Abstract: A process for the production of lower molecular weight polymers by free radical polymerization, characterized in that there is added to the polymerization system a compound of the general formula I ##STR1## wherein R.sup.1 is hydrogen, chlorine, an alkyl group, or a group capable of activating the vinylic carbon towards free radical addition;R.sup.2 is hydrogen or an optionally substituted alkyl, alkenyl, aryl, cycloalkenyl or cycloalkyl group or the group --COZ, where Z is R.sup.3 or OR.sup.3, where R.sup.3 is hydrogen or an optionally substituted alkyl, alkenyl or aryl group.X is a hydrogen atom, an alkyl or aryl group, or a halogen, and the two X groups may be the same or different.The invention also includes polymers or oligomers made by the process and novel compounds of the generated formula I as defined above.

Abstract: Peroxidic compositions utilizable for curing elastomers and polyolefins having scorch retardant properties, which comprise:(A) a peroxide in powder or in the form of granules or master batch(B)+(C) inhibitor and promoter in powder, granules or master batch,wherein (B) is an inhibitor derived from hydroquinone and (C) is a curing promoter.

Abstract: The present invention is an improvement in a free radical bulk polymerization process for preparing a high molecular weight polymer from a vinyl aromatic monomer characterized in that the polymerization is conducted in the presence of an acid catalyst having a pKa at 25.degree. C. of less than 2, or salt thereof, wherein the improvement comprises dispersing the acid catalyst, or salt thereof, in a (meth)acrylic acid or ester thereof, prior to contact with the vinyl aromatic monomer. The (meth)acrylic acid or ester allows the acid catalyst to be dispersed within the vinyl aromatic monomer without causing cationic polymerization. The acid catalyst, or salt thereof, catalyzes the free radical polymerization reaction such that high molecular weight polymers are produced in reasonable reaction times.

Abstract: An improved process for making vinyl aromatic/allylic alcohol copolymers is disclosed. Gradual addition of a free-radical initiator during the course of the polymerization results in a substantial increase in the polymer yield obtained compared with the yield from conventional processes in which all of the free-radical initiator is charged initially. High yields are obtained when the monomer mole ratios are adjusted to produce styrene-allyl alcohol copolymers having a hydroxyl number in the 50-150 mg KOH/g range. Copolymers made by the process are valuable coating resins.

Abstract: A novel peroxide composition of Structure A, ##STR1## and use of the novel oxalic acid peroxide composition of Structure A as an initiator; a) for curing of unsaturated polyester resins, b) for polymerizing ethylenically unsaturated monomers, c) for crosslinking of polyolefins, d) for curing of elastomers, e) for modifying polyolefins, f) for grafting of vinyl monomers onto polymer backbones and g) for compatibilizing blends of two or more incompatible polymers are disclosed.

Abstract: A novel bis(mono- or diperoxyoxalate) composition of Structure A, ##STR1## and use of the novel bis(mono- or diperoxyoxalate) composition as an initiators for curing of unsaturated polyester resins and for polymerizing ethylenically unsaturated monomers are disclosed.

Abstract: Novel functionalized peroxides which may be used as crosslinking, grafting and curing agents, initiators for polymerization reactions and as monomers for condensation polymerizations to form peroxy-containing polymers, which in turn can be used to prepare block and graft copolymers, have the following Formula I: ##STR1## R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X, Y.sup.1, Y.sup.2, Y.sup.3, Z.sup.1, Z.sup.2, x, y and z are as defined in the Summary of the Invention. The compounds of Formula I may be prepared by reacting hydroxy-containing tertiary hydroperoxides with diacid halides, phosgene, dichloroformates, diisocyanates, anhydrides and lactones to form the functionalized peroxides. These reaction products may be further reacted, if desired, with dialcohols, diamines, aminoalcohols, epoxides, epoxy alcohols, epoxy amines, diacid halides, dichloroformates and diisocyanates to form additional functionalized peroxides.

Abstract: A process for the production of lower molecular weight polymers by free radical polymerization, characterized in that there is added to the polymerization system a compound of the general formula I ##STR1## wherein R.sup.1 is hydrogen, chlorine, an alkyl group, or a group capable of activating the vinylic carbon towards free radical addition;R.sup.2 is hydrogen or an optionally substituted alkyl, alkenyl, aryl, cycloalkenyl or cycloalkyl group or the group --COZ, where Z is R.sup.3 or OR.sup.3, where R.sup.3 is hydrogen or an optionally substituted alkyl, alkenyl or aryl group.X is a hydrogen atom, an alkyl or aryl group, or a halogen, and the two X groups may be the same or different.The invention also includes polymers or oligomers made by the process and novel compounds of the general formula I as defined above.

Abstract: The method for controlling a polymerization rate, in a continuous radical polymerization of mainly styrene monomer using a complete mixing type reactor, without substantially changing an average molecular weight of a polymer formed, comprising the steps of: (a) keeping a polymerization temperature substantially constant at t(.degree.C.), (b) setting a feeding rate of the styrene monomer to A times larger rate than that in a polymerization conducted in the absence of a radical polymerization initiator, and (c) controlling an amount of the radical polymerization initiator added in the range of from (0.1/n).times.10.sup.-3 to (2.0/n).times.10.sup.-3 mol per 1 liter of the monomer, n being a number of radical generating functional groups present in one molecule of the radical polymerization initiator, such that a polymer concentration x satisfy the mathematical expression: x.gtoreq.0.3t+6.multidot.

Abstract: A free radical polymerization process for producing a branched polymer from a vinyl aromatic monomer comprising polymerizing a vinyl aromatic monomer in the presence of a free radical initiator of the formula: ##STR1## wherein R is H, alkyl, or aralkyl, and R' is alkyl or aryl.

Abstract: A true solution of up to about 15 weight % of polyphenylene ether (PPO) in a styrenic polymer may be prepared by dissolving the PPO in one or more of the monomers polymerized to form the styrenic polymer and polymerizing the resulting solution in the presence of a free radical initiator. The resulting polymer has a higher Tg than crystal polystyrene and is suitable for use in hot drink containers.

Abstract: The present invention provides a process for producing a styrene or styrene derivative polymer of narrow molecular weight distribution, which comprises (co)polymerizing a styrene or styrene derivative monomer using, as the catalyst system, a mixture of a free radical compound, a radical polymerization initiator and a phosphorus compound. With the present process, the polymerization speed is very high and a monodisperse polymer of narrow molecular weight distribution can be obtained easily.

Abstract: A process for the preparation of an aqueous suspension of a solid free-radical forming initiator, a plant for the preparation, an initiator suspension and use of the suspension in polymerization of ethylenically unsaturated monomers. The process for the preparation of the suspension comprises the steps of:(a) heating the initiator to its melting point;(b) finely dividing the initiator in water while it is in a molten state;(c) rapid cooling so that the initiator is in a molten state for a period of time which is less than about 5 minutes.The initiator suspension has very small particles and a narrow particle size distribution whereby at least 50% by weight of the particles are smaller than 5 .mu.m and at least 90% by weight of the particles are smaller than 10 .mu.m.

Abstract: The present invention relates to a novel antioxidant-peroxide compound of Structure A,(Y--[--R--OO--X).sub.x --An].sub.y Ain which the definitions of X, Y, R, An, x, and y are given in the Summary of the Invention section, for example, t-butyl peroxy-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, processes for producing polymeric compositions of enhanced oxidative stability via initiation of polymerization of ethylenically unsaturated monomers, curing of elastomers and unsaturated polyester resins, modification of polypropylene and other polymers and copolymers, and crosslinking of olefin polymers and copolymers, and the resulting polymers having enhanced oxidative stability.

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: A process for producing a monovinylidene aromatic polymer having molecular weight (Mw) greater than 275,000 which comprises polymerizing a monomer mixture comprising a monovinylidene aromatic monomer in the presence of:A) from 10 to 2000 ppm by weight of at least one free radical generating, branching polymerization initiator; andB) from 10 to 2000 ppm of one or more organic gel reduction agent selected from the group consisting of:1) mercaptans, terpenes, halocarbons and halohydrocarbons, such agent having up to 20 carbons,2) distillate recovered from the reaction devolatilization process (recycle), and3) mixtures of 1) and 2).

Abstract: An improved process for making vinyl aromatic/allylic alcohol copolymers is disclosed. Gradual addition of a free-radical initiator during the course of the polymerization results in a substantial increase in the polymer yield obtained compared with the yield from conventional processes in which all of the free-radical initiator is charged initially. The process is particularly useful for making commercially important varieties of styrene-allyl alcohol copolymers.

Abstract: A process for sealing or adhering two surfaces having gaps of more than 100 micrometers between the surfaces which comprises:(A) applying to at least one of said surfaces an anaerobic composition comprising:(i) a room temperature polymerizable (meth)acrylic monomer,(ii) a peroxy free radical initiator, and(iii) an amount effective as an accelerator of a combination of saccharin and at least one onium salt (other than an iodide); and(B) placing said surfaces in an abutting relationship until the composition has cured through the gaps.Exemplified onium salts are phosphonium salts of the formula IV and quaternary ammonium salts of the formula II: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 which may be the same or different, are hydrocarbyl, hydrocarbylaryl, aryl or a substituted derivative thereof;X is Cl, Br or F, or a soft anion.

Abstract: The present invention provides an anaerobic curing composition comprising a monofunctional or multifunctional acrylate or methacrylate as a polymerizable monomer having at least one functional vinyl group, 0.1 to 10 percent by weight of an organic peroxide and 0.1 to 10 percent by weight of at least one aromatic amine having a pKa of 6.5 to 9.0, based on the total weight of the monomer, which may be stored as a liquid for a long time and cures rapidly at anaerobic conditions, to form a strong bond between adjacent surfaces of, especially, metals, so that it is useful as an adhesive and sealant for metals.

Abstract: A sheet-like article comprising a continuous oriented polymer phase having dispersed therein from about 5-50% by weight of cross-linked polymeric microparticles based on the weight of the oriented polymer, the microparticles being partially bordered by void space, the void space occupying about 2 to 60% by volume of the sheet-like article, the cross-linked polymeric microparticles having been prepared by the free radical polymerization of an ethylenically mono-unsaturated monomer and an ethylenically poly-unsaturated monomer in the presence of an effective amount of diacyl peroxide to catalyze the reaction.

Abstract: Novel unsaturated peroxyketals useful as molecular weight regulators in polymerization reactions are disclosed. Also disclosed are a polymerization process employing these novel unsaturated peroxyketals as molecular weight regulators, 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 peroxyketals provide the ability to introduce an epoxy functionality to the oligomer or polymer as well as an additional functionality, in a manner which gives a higher monomer conversion and less by-products than with comparable chain transfer regulators.

Abstract: An organic glass with improved impact strength and with a refractive index equal or similar to that of mineral glass (crown glass), is composed of the product of the radicalic polymerization of the polymerizable liquid composition obtained by the transesterification of:(A) diallyl carbonate with a mixture of polyols:(B) bis(2-hydroxyethylether) of bisphenol-A,(C) diethylene glycol, and(D) tris(hydroxyethyl) isocyanurate,where for every 100 parts b.w. of the sum of polyols (B), (C) and (D), polyol (B) is present in a quantity of from 20 to 60% b.w., polyol (C) is present in a quantity of from 20 to 60% b.w. and polyol (D) is present in a quantity of from 10 to 40% b.w.; and where the molar ratio between the diallyl carbonate and the sum of polyols (A)/(B)+(C)+(D) is equal to or higher than 3/1.

Abstract: An ester type polymeric peroxide; has a peroxide group of the formula (I): ##STR1## a group of the formula (I') ##STR2## a group of the formula (II) ##STR3## wherein X stands for one member selected from the group consisting of --CH.sub.2 --CH.sub.2 --, --C.tbd.C-- and ##STR4## continuously bound such that I and I' occur randomly in alternation with II, having a (I):(I') molar ratio in the range of from 9:1 to 1:9 and the [(I)+(I')]:(II) molar ratio in the range of from 6:4 to 4:6, and having an average molecular weight in the range of from 1,000 to 20,000, a polymerization initiator for vinyl type monomer comprising said ester type polymeric peroxide and method for the production of a block copolymer of vinyl type monomer by said polymerization initiator.

Abstract: A process for the copolymerization of styrene or .alpha.-methylstyrene with an unsaturated acid derivative is disclosed. The process is carried out in the presence of a tetrafunctional organic peroxide and produces copolymeric products having significantly improved properties.

Abstract: An acrylic elastomer capable of giving a vulcanization product having a distinguished tensile strength and a good stretching even by cross-linking with an organic peroxide can be obtained by using an organic peroxide having a non-conjugated double bond as a polymerization initiator in polymerization of at least one of (a) alkyl acrylates having an alkyl group of 1 to 8 carbon atoms and (b) alkoxyalkyl acrylates having an alkoxylalkyl group of 2 to 8 carbon atoms.

Abstract: A novel peroxy aryl carbonate which has the both properties of polymerization-initiating and regulating abilities, can be used as a radical polymerization initiator to regulate the polymerization rate, the polymerization degree and molecular weight distribution of the polymer and the like, and therefore produce superior styrene resin and methyl methacrylate syrup.