Abstract: Process for thermally stabilizing a polymer containing residues of a Sn(II), Sb(III), Pb(II), Bi(III), Fe(II), Ti(II), Ti(III), Mn(II), Mn(III), or Ge(II)-containing catalyst by treating the polymer at a temperature above its melting temperature with a peroxide selected from the group consisting of ketone peroxides, hydroperoxides, peracids, hydrogen peroxide, and mixtures thereof, wherein said peroxide is used in an amount less than 0.2 wt % based on the weight of the polymer and wherein the molar ratio of peroxy functionalities from said peroxide (p) to metal (M) ranges from 1 to 100; said metal (M) being selected from the group consisting of Sn(II), Sb(III), Pb(II), Bi(III), Fe(II), Ti(II), Ti(III), Mn(II), Mn(III), and Ge(II). The invention further relates to a method for determining the metal residue content of a polymer.

Abstract: Process for the modification of a polymer or copolymer having the following general structure for one or more of the repeating units: (1) wherein n is an integer, m is an integer in the range 0 to 6, and R is selected from hydrogen, substituted or unsubstituted C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl, which groups may include linear or branched alkyl moieties; the optional one or more substituents being selected from the group consisting of hydroxy, alkoxy, linear or branched alk(en)yl, aryloxy, halogen, carboxylic acid, ester, carboxy, nitrile, and amido groups, which process involves contacting the polymer or copolymer with a cyclic organic peroxide under conditions whereby at least some of said peroxide is decomposed. This process results in a (co)polymer with a high degree of branching but free of gel formation.

Abstract: A process for the suspension polymerization of styrene monomer to produce polystyrene comprising the steps of (a) heating a polymerization suspension comprising the styrene monomer to a temperature of at least 60° C., (b) dosing an initiator to said heated polymerization suspension during the polymerization reaction over a period of more than 90 minutes to less than 5 hours, in a continuous manner or intermittently in at least 2 portions, said period starting at a monomer conversion of 65% of less and said initiator having a half-life at the temperature at which it is dosed of not more than 60 minutes, wherein a brominated flame retardant is present in the polymerization suspension during the polymerization reaction.

Abstract: Composition comprising at least one polyolefin, tris-dibromopropyl isocyanurate, and 0.05-2 phr of at least one free radical initiator, said initiator being selected from the group consisting of organic peroxides, C—C initiators, and N—N initiators. This composition makes it possible to obtain very good flame retardancy with much lower amounts of synergist than known compositions. What is more, a synergist is not even required to obtain sufficient flame retardancy.

Abstract: Composition comprising at least one polyolefin, a brominated flame retardant, a free radical initiator, and more than 0.1 phr to not more than 0.5 phr of a synergist selected from the group consisting of antimony compounds, tin compounds, molybdenum compounds, zirconium compounds, boron compounds, zinc compounds, and mixtures thereof. This composition has very good flame retardancy with only very low amounts of synergist.

Abstract: Process for thermally stabilizing a polymer containing residues of a Sn(II), Sb(III), Pb(II), Bi(III), Fe(II), Ti(II), Ti(III), Mn(II), Mn(III), or Ge(II)-containing catalyst by treating the polymer at a temperature above its melting temperature with a peroxide selected from the group consisting of ketone peroxides, hydroperoxides, peracids, hydrogen peroxide, and mixtures thereof, wherein said peroxide is used in an amount less than 0.2 wt % based on the weight of the polymer and wherein the molar ratio of peroxy functionalities from said peroxide (p) to metal (M) ranges from 1 to 100; said metal (M) being selected from the group consisting of Sn(II), Sb(III), Pb(II), Bi(III), Fe(II), Ti(II), Ti(III), Mn(II), Mn(III), and Ge(II). The invention further relates to a method for determining the metal residue content of a polymer.

Abstract: A process for preparing a styrene-based (co)polymer comprising the steps of: a) preparing a monomer composition comprising styrene monomer and optionally one or more co-monomers and b) polymerising the monomer composition in the presence of an initiator mixture containing (i) 55-95 wt % of at least one polyfunctional initiator having a 1-hour half-life temperature in the range of 70-110° C. and (ii) 5-45 wt % of at least one monofunctional initiator having a 1-hour half-life temperature in the range of 70-110° C., so as to form the styrene-based (co)polymer.

Abstract: Process for the modification of a polymer or copolymer having the following general structure for one or more of the repeating units: (1) wherein n is an integer, m is an integer in the range 0 to 6, and R is selected from hydrogen, substituted or unsubstituted C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl, which groups may include linear or branched alkyl moieties; the optional one or more substituents being selected from the group consisting of hydroxy, alkoxy, linear or branched alk(en)yl, aryloxy, halogen, carboxylic acid, ester, carboxy, nitrile, and amido groups, which process involves contacting the polymer or copolymer with a cyclic organic peroxide under conditions whereby at least some of said peroxide is decomposed. This process results in a (co)polymer with a high degree of branching but free of gel formation.

Abstract: The invention relates to peroxides derivable from The invention further relates to the process to make these peroxides as well as to their use in polymerization, curing, and modification reactions.

Abstract: The invention relates to peroxides derivable from 1

Abstract: The invention relates to a preparation process for making peroxy esters and peroxy carbonates, peroxy ester peroxy carbonates, mixed diperoxides, mixed diperoxy esters, and mixed diperoxy carbonates, and to specific monoperoxy esters, monoperoxy carbonates, mixed peroxides, mixed diperoxy esters, mixed diperoxy carbonates, peroxy ester peroxy carbonates, and mixtures thereof. The process involves the reaction of a type-3 ketone peroxide with a reactive carbonyl compound and optional subsequent reaction with an alkyl vinyl ether, acetal, halogen formate, or carboxylic acid anhydride.

Abstract: Process for providing acrylic (co)polymers suitable for high solids coating applications, comprising the step of:

Abstract: The invention relates to peroxides derivable from The invention further relates to the process to make these peroxides as well as to their use in polymerization, curing, and modification reactions.

Abstract: The invention relates to a preparation process for making peroxy esters and peroxy carbonates, peroxy ester peroxy carbonates, mixed diperoxides, mixed diperoxy esters, and mixed diperoxy carbonates, and to specific monoperoxy esters, monoperoxy carbonates, mixed peroxides, mixed diperoxy esters, mixed diperoxy carbonates, peroxy ester peroxy carbonates, and mixtures thereof. The process involves the reaction of a type-3 ketone peroxide with a reactive carbonyl compound and optional subsequent reaction with an alkyl vinyl ether, acetal, halogen formate, or carboxylic acid anhydride.

Abstract: The invention is drawn to compounds of formula (I) which is HOO—C(R1)(R2)—OO—(R1)(R2)—OO—(C═O)—(O)nR3 wherein n is 0 or 1, R1 and R2 are independently selected from the group consisting of H, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, C7-C20 alkaryl which may be optionally substituted or R1 and R2 can form a C3-C12 cycloalkyl group and R3 is selected from C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl which can be optionally substituted; a process for the preparation of the peroxy esters or peroxy carbonates of formula (I); and the method of using the compounds as polymer initiators or curing agents.

Abstract: The present invention relates to a new class of peroxides and to a process for the preparation of these peroxides having the general formula (I), wherein n=1 or 2, R1, R2, R4, R5, and R6 are independently selected from the group comprising hydrogen, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl, or R1 and R2 form a C3-C12 cycloalkyl group, which groups may include linear or branched alkyl moieties; and each of R1, R2, R4, R5, and R6 may optionally be substituted with one or more groups selected from hydroxy, alkoxy, linear or branched alkyl, aryloxy, halogen, ester, carboxy, nitrile, and amido, and R1 and R2 may form a ring, and R3 is independently selected from the group comprising C1-C20, alkyl; C3-C20 cycloalkyl, C6-C20 aryl, C7-C20, aralkyl, and C7-C20 alkaryl, which groups may include linear or branched alkyl moieties; and R3 may optionally be substituted with one or more groups selected from hydroxy, alkoxy, linear or branched alkyl, aryloxy,

Abstract: The invention relates to a process for enhancing the melt strength of polypropylene comprising the steps of: mixing the polypropylene with at least one peroxydicarbonate; reacting said polypropylene and peroxydicarbonate at a temperature between 150° C. and 300° C., with the proviso that the peroxydicarbonate is not in the form of an aqueous dispersion.

Abstract: The invention pertains to a process for enhancing the melt strength of a polypropylene (co)polymer with the aid of initiator dispersions. The use of initiator dispersions with a particulate initiator instead of the corresponding non-dispersed initiators or their dilutions or solutions results in a significant enhancement of the melt strength of the modified polymer, and a wide range of initiators turn out to be serviceable.

Abstract: A process for the modification of (co) polymers employing an organic peroxide comprising the step of contacting a (co) polymer with organic peroxide under conditions whereby at least some of the said organic peroxide is decomposed, is disclosed. The process is characterized in that at least 20% of the total active oxygen content of said organic peroxide is attributable to one or more cyclic ketone peroxides. In a second aspect, the invention relates to the use of an organic peroxide composition wherein at least 20% of the total active oxygen content is contributed by one or more cyclic ketone peroxide(s) modify (co) polymers. It has been found that these cyclic ketone peroxides are extremely efficient in (co) polymer modification processes.

Abstract: A transportable, storage stable cyclic ketone peroxide composition which comprises 1.0-90% by weight of one or more cyclic ketone peroxides and 10-99% by weight of one or more diluents selected from the group consisting of liquid phlegmatizers for the cyclic ketone peroxides, plasticizers, solid polymeric carriers, inorganic supports, organic peroxides and mixtures thereof, is disclosed. Also disclosed is the use of these cyclic ketone peroxide formulations in the modification of (co)polymers. These formulations provide a surprising degree of polymer modification when compared to their non-cyclic ketone peroxide counterparts.