Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
  • C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F212/02—Monomers containing only one unsaturated aliphatic radical
  • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F212/06—Hydrocarbons
  • C08F212/08—Styrene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/42—Nitriles
  • C08F220/44—Acrylonitrile
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F4/00—Polymerisation catalysts
  • C08F4/28—Oxygen or compounds releasing free oxygen
  • C08F4/32—Organic compounds
  • C08F4/38—Mixtures of peroxy-compounds

Definitions

• the present invention relates to a mixture of initiators, a composition, their use, a process for preparing a polyol polymer and a polyol polymer obtained by the process.
• Polyol polymers are widely used in polyurethane foams, such as pillows, sofas and the like.
• an azo initiator such as azodiisobutyronitrile (AIBN) is widely used as an initiator for the preparation of polyol polymers.
• the decomposition of the azo initiator is toxic and the dose of the azo initiator used is high, a peroxide initiator such as t-amyl peroxide has been used to replace the azo initiator.
• a peroxide initiator such as t-amyl peroxide has been used to replace the azo initiator.
• the main problems of the peroxide initiator are that the amount of the residual monomer in the POP is high and that the viscosity of the final POP is high.
• a first object of the invention is to provide a mixture of initiators comprising a first peroxide of formula (I) and a second peroxide of formula (II):
• R 1 and R 2 independently represent an alkyl group or an alkanoyl group comprising 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms, and more preferably 4 to 20 carbon atoms,
• R 3 and R 5 independently represent an alkyl group comprising 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms and more preferably 5 to 10 carbon atoms
• R 4 represents a cycloalkylene group comprising 3 to 30 carbon atoms; carbon atoms, preferably 4 to 20 carbon atoms, and more preferably 5 to 10 carbon atoms.
• R 1 and / or R 2 represent an alkanoyl group.
• R 1 and / or R 2 represent a t-amyl group.
• at least one Ri represents an alkanoyl group and R 2 represents a t-amyl group.
• R 1 is selected from the group consisting of formacyl, acetyl, propionyl, butyryl, valeryl, pivaloyl, caproyl, enanthyl, capryloyl, 2-ethylcaproyl, nonanoyl, decanoyl, undecanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, hexadecanoyl, octadecanoyl and eicosanoyl.
• R 2 , R 3 and R 5 independently represent a tert-alkyl group comprising 4 to 30 carbon atoms, preferably 4 to 20 carbon atoms and more preferably 5 to 10 carbon atoms, and are in particular independently selected from the group consisting of t-butyl, t-amyl, t-hexyl, t-heptyl, t-octyl, t-nonyl and t-decyl.
• R 4 represents a 1,1-cycloalkylene group, and is preferably selected from the group consisting of cyclopropylene, cyclobutylene, cyclopentylene, cyclohexylene, cycloheptylene, cyclooctylene, cyclononylene and cyclodecylene.
• R 1, R 2 , R 3 , R 4 and R 5 are possible in combination for formulas (I) and (II).
• the first peroxide of formula (I) is t-amyl peroxy-2-ethylhexanoate, tert-amyl peroxypivalate, tert-butyl peroxy-2-ethylhexanoate or tert-amyl peroxyneodecanoate. .
• the second peroxide of formula (II) is 1,1-di (t-amylperoxy) -cyclohexane, 1,1-di (tert-butylperoxy) -3,3,5-trimethylcyclohexane or the 1,1-di (tert-butylperoxy) -cyclohexane.
• the initiator mixture comprises 50 to 90% by weight, preferably 70 to 90% by weight, of the first peroxide of formula (I) and 10 to 50% by weight, preferably 10 to 30% by weight. by weight, the second peroxide of formula (II), relative to the total weight of the mixture of initiators.
• the initiator mixture further comprises a third peroxide of formula (III):
• Re and R 7 independently represent an alkyl group having 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms, and more preferably 5 to 10 carbon atoms.
• Re represents a tert-alkyl group comprising 4 to 30 carbon atoms, preferably 4 to 20 carbon atoms and more preferably 5 to 10 carbon atoms, and is in particular chosen from the group consisting of t-butyl, t-amyl, t-hexyl, t-heptyl, t-octyl, t-nonyl and t-decyl.
• R 7 is selected from the group consisting of methyl, ethyl, propyl, butyl, amyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, cetyl, octadecyl and eicosyl.
• the third peroxide of formula (III) is OO-t-amyl-O- (2-ethylhexyl) -monoperoxycarbonate or POO-t-butyl-O- (2-ethylhexyl) -monoperoxycarbonate.
• the initiator mixture comprises 50 to 90% by weight, preferably 70 to 90% by weight, of the first peroxide of formula (I), 10 to 50% by weight, preferably 10 to 30% by weight. by weight of the second peroxide of formula (II), and an amount greater than 0 and less than or equal to 30% by weight, preferably from 10 to 20% by weight, of the third peroxide of formula (III), relative to the weight total of the initiator mixture.
• a second object of the invention is to provide a composition comprising the initiator mixture according to the present invention and a thiol-based chain transfer agent.
• the thiol-based chain transfer agent is a chain transfer agent of formula (IV):
• R 9 is an alkyl group having 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms, and more preferably 5 to 10 carbon atoms.
• Rs is selected from the group consisting of methylene, ethylene, propylene, butylene, pentylene, hexylene, heptylene, octylene, nonylene and decylene.
• R9 is selected from the group consisting of methyl, ethyl, propyl, butyl, amyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, cetyl, octadecyl and eicosyl.
• the chain transfer agent of formula (IV) is 2-ethylhexyl thioglycolate.
• the composition comprises 30 to 70% by weight, preferably 40 to 60% by weight, of the initiator mixture and 30 to 70% by weight, preferably 40 to 60% by weight, of the thiol-chain transfer agent, based on the total weight of the composition.
• a third object of the invention is to provide a method for preparing a polyol polymer, comprising: using the initiator mixture according to the present invention invention or the composition according to the invention as an initiator.
• the process comprises polymerizing a reaction mixture comprising a polyol, an ethylenically unsaturated monomer and a macromonomer in the presence of the initiator mixture or the composition.
• the amount of the initiator mixture or the composition is from 0.1 to 0.8% by weight, based on the weight of the reaction mixture.
• a fourth objective of the invention is to propose a use of the initiator mixture according to the present invention or of the composition according to the invention for the preparation of a polyol polymer.
• a fifth object of the invention is to provide a polyol polymer obtained by the process according to the present invention.
• the present invention overcomes one or more of the disadvantages of the prior art.
• the invention makes it possible to reduce the amount of residual monomer and / or the viscosity of the polyol polymer.
• the invention is based on the discovery that the combination of the first peroxide of formula (I) and the second peroxide of formula (II) makes it possible to obtain a synergistic effect in terms of reducing the amount of the residual monomer, in comparison with the first peroxide of formula (I) or the second peroxide of formula (II) alone.
• the additional addition of the thiol-based chain transfer agent, in particular the chain transfer agent of formula (IV), makes it possible to reduce the dose of the initiator. peroxidic and also to decrease the viscosity of the final polyol polymer.
• the invention relates to a mixture of initiators, a composition comprising the initiator mixture, their use, a process for preparing a polyol polymer and a polyol polymer obtained by the process.
• the initiator mixture of the present invention comprises a first peroxide of formula (I) and a second peroxide of formula (II):
• R 1 and R 2 independently represent an alkyl group or an alkanoyl group comprising 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms, and more preferably 4 to 20 carbon atoms,
• R3-OO-R4-OO-R5 in which R 3 and R 5 independently represent an alkyl group comprising 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms and more preferably 5 to 10 carbon atoms, and R 4 represents a cycloalkylene group comprising 3 to 30 atoms carbon, preferably 4 to 20 carbon atoms, and more preferably 5 to 10 carbon atoms.
• R 1, R 2 , R 3 and R 5 may each be linear or branched.
• R 1, R 2 , R 3 , R 4 and R 5 may each be substituted or unsubstituted, and the substituents may include halogen (eg, F, Cl, Br or I), alkyl (eg, C 1 to C 10), alkoxy (e.g., C1 to C10) and the like.
• R 1, R 2 , R 3 and R 5 may each be an unsubstituted linear or branched alkyl group, and R 4 may be an unsubstituted cycloalkylene group.
• R 1 and / or R 2 represent an alkanoyl group. Moreover, Ri and / or R 2 represent a t-amyl group.
• R1 can be selected from the group consisting of formacyl, acetyl, propionyl, butyryl, valeryl, pivaloyl, caproyl, enanthyl, capryloyl, 2-ethylcaproyl, nonanoyl, decanoyl, undecanoyl, dodecanoyl, tridecanoyl, tetradecanoyl, hexadecanoyl, octadecanoyl and eicosanoyl.
• R 2 , R 3 and R 5 may each independently represent a tert-alkyl group comprising 4 to 30 carbon atoms, preferably 4 to 20 carbon atoms and more preferably 5 to 10 carbon atoms, and are in particular independently selected in the group consisting of t-butyl, t-amyl, t-hexyl, t-heptyl, t-octyl, t-nonyl and t-decyl.
• R 4 may be 1,1-cycloalkylene, and is preferably selected from the group consisting of cyclopropylene, cyclobutylene, cyclopentylene, cyclohexylene, cycloheptylene, cyclooctylene, cyclononylene and cyclodecylene.
• Preferred examples of the first peroxide of formula (I) include peroxygen
• T-amyl 2-ethylhexanoate (for example marketed by Arkema under the name
• Luperox® 575 tert-amyl peroxypivalate, tert-butyl peroxy-2-ethylhexanoate or tert-amyl peroxyneodecanoate.
• Preferred examples of the second peroxide of formula (II) include 1,1-di (t-amylperoxy) -cyclohexane, 1,1-di (tert-butylperoxy) -3,3,5-trimethylcyclohexane or 1,1 -di (tert-butylperoxy) cyclohexane (e.g., sold by Arkema under the name Luperox 531M80 ®, ® Luperox 331, Luperox ® 231).
• the amount of the first peroxide of formula (I) is 50 to 90% by weight, for example 70 to 90% by weight or 60 to 80% by weight, and preferably 80% by weight
• the amount of second peroxide of formula (II) is 10 to 50% by weight, for example 10 to 30% by weight or 20 to 40% by weight, and preferably 20% by weight, relative to the total weight of the mixture initiators.
• the initiator mixture of the present invention may consist of the first peroxide of formula (I) and the second peroxide of formula (II).
• the initiator mixture of the present invention may further comprise a third peroxide of formula (III):
• Re and R 7 independently represent an alkyl group having 1 to 30 carbon atoms, preferably 3 to 20 carbon atoms, and more preferably 5 to 10 carbon atoms.
• Re and R 7 may each be linear or branched and may be substituted or unsubstituted. Substituents may include halogen (eg, F, Cl, Br or I), alkyl (eg, C1 to C10), alkoxy (eg, C1 to C10) and the like. According to one embodiment, Re and R 7 can each be an unsubstituted linear or branched alkyl group.
• R 9 can represent a tert-alkyl group comprising 4 to 30 carbon atoms, preferably 4 to 20 carbon atoms and more preferably 5 to 10 carbon atoms, and is in particular selected from the group consisting of t-butyl, t-amyl, t-hexyl, t-heptyl, t-octyl, t-nonyl and t-decyl.
• R 7 may be selected from the group consisting of methyl, ethyl, propyl, butyl, amyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, cetyl, octadecyl and eicosyl.
• Preferred examples of the third peroxide of formula (III) include OO-t-amyl-O- (2-ethylhexyl) -monoperoxycarbonate or POO-t-butyl-O- (2-ethylhexyl) monoperoxycarbonate (e.g. Arkema under the name Luperox ®
• the amount of the first peroxide of formula (I) is 50 to 90% by weight, for example
• the amount of the second peroxide of formula (II) is from 10 to 50% by weight, for example from 10 to 30% by weight or 20 to 40% by weight, and preferably 10% by weight
• the amount of the third peroxide of formula (III) is greater than 0 and less than or equal to 30% by weight, for example from 10 to 20% by weight, and preferably 10% by weight, relative to the total weight of the initiator mixture.
• the composition according to the present invention comprises the initiator mixture as described above and a thiol chain transfer agent.
• the thiol chain transfer agent is a chain transfer agent of formula (IV):
• Rs and R9 may each be linear or branched, and may be substituted or unsubstituted. Substituents may include halogen (eg, F, Cl, Br or I), alkyl (eg, C1 to C10), alkoxy (eg, C1 to C10) and the like. According to one embodiment, Rs may be an unsubstituted linear or branched alkylene group, and R9 may be an unsubstituted linear or branched alkyl group.
• halogen eg, F, Cl, Br or I
• alkyl eg, C1 to C10
• alkoxy eg, C1 to C10
• Rs may be selected from the group consisting of methylene, ethylene, propylene, butylene, pentylene, hexylene, heptylene, octylene, nonylene and decylene.
• R9 may be selected from the group consisting of methyl, ethyl, propyl, butyl, amyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, cetyl, octadecyl and eicosyl.
• Preferred examples of the chain transfer agent of formula (IV) include 2-ethylhexyl thioglycolate (for example marketed by Arkema as HEM A).
• the amount of the initiator mixture is 30 to 70% by weight, for example 40 to 60% by weight, and preferably 50% by weight, and the amount of the thiol chain transfer agent. is from 30 to 70% by weight, for example from 40 to 60% by weight, and preferably 50% by weight, relative to the total weight of the composition.
• the above thiol chain transfer agent is useful for decreasing the viscosity of the final polyol polymer.
• the additional use of the thiol-based chain transfer agent makes it possible to reduce the dose of the peroxide initiator and also to reduce the viscosity of the final product.
• the process for preparing the polyol polymer comprises using the initiator mixture or the composition described above as an initiator.
• the process comprises polymerizing a reaction mixture comprising a polyol, an ethylenically unsaturated monomer and a macro-monomer in the presence of the initiator mixture or composition.
• the polyol used in the present invention may be any polyol available in the art.
• the polyol includes polyether polyol, polyester polyol, and the like.
• the preferred polyol is polyalkylene polyether polyol oxide such as poly (oxypropylene) and / or poly (oxypropyleneoxyethylene) glycols, triols and polyols of higher functionality.
• the number average molecular weight of the polyol is not particularly limited, but may be about 400 or more, preferably about 1000 or more, for example from about 400 to about 12000, preferably from about 2000 to about 8000.
• the ethylenically unsaturated monomer used in the present invention may be any ethylenically unsaturated monomer available in the art.
• Suitable ethylenically unsaturated monomer comprises (i) aromatic vinyl monomers such as styrene and the like, (ii) acrylic monomers such as acrylates and methacrylates, and (iii) ethylenically unsaturated nitriles and amides such as acrylonitrile, methacrylonitrile and the like.
• the preferred ethylenically unsaturated monomer is styrene and / or acrylonitrile.
• the amount of styrene can be from about 10% to about 85%, preferably from about 40% to about 75%, and more preferably from about 50% to about 70%, based on the weight of acrylonitrile.
• the ratio of the polyol to the ethylenically unsaturated monomer in the present invention is not particularly limited, but may be from 40 to 90: 10 to 60 and preferably from 60 to 80:20 to 40.
• the macromonomer used in the present invention may be any macromonomer available in the art.
• the macromonomer can be synthesized by a polyol with maleic anhydride at an elevated temperature with a suitable catalyst.
• the amount of the mono-mother macro is not particularly limited, but may be from 2 to 5% by weight, based on the weight of the reaction mixture consisting of the polyol, the ethylenically unsaturated monomer and the macromonomer.
• the reaction mixture may also include various additives known in the art, for example inhibitors such as Irganox 1076.
• the amount of the initiator mixture or the composition used in the present invention is not particularly limited, but may be from 0.1 to 0.8% by weight, based on the weight of the reaction mixture consisting of the polyol, the ethylenically unsaturated monomer and the macromonomer.
• the polymerization of the reaction mixture can be carried out in a reactor, and the mixture of initiators or the composition can be added simultaneously to the reactor.
• the polymerization of the reaction mixture can be carried out in two reactors, and at least one of the components of the initiator mixture or the composition can be added to the first reactor, while the other components can be added to the second reactor.
• the first peroxide can be added to the first reactor, while the second peroxide and the third peroxide and the chain transfer agent can be added to the first reactor.
• thiol (if present) can be added to the second reactor.
• the polymerization can be carried out at a temperature of at least 90 ° C, preferably 100 ° C to 140 ° C, and more preferably 120 to 135 ° C.
• the polymerization can be carried out in a solvent.
• the solvent used in the present invention may be any solvent available in the art.
• the solvent may be chosen from benzene, toluene, xylene, ethylbenzene, hexane, isopropanol, n-butanol, 2-butanol, ethyl acetate and acetate. butyl and mixtures thereof.
• the present invention relates to a use of the initiator mixture according to the present invention or the composition according to the invention for the preparation of the polyol polymer.
• the polyol polymer obtained by the process can exhibit improved properties, such as reduced residual monomer level and / or reduced viscosity.
• Example 1 illustrates the invention without limiting it.
• PPG polyether polyol
• the polymer polyol is obtained as in Example 1 except that 1.733 g of a mixture of 80% by weight of Luperox 575, 10% by weight of Luperox 531M80 ® and 10% by weight of Luperox TAEC is used as an initiator.
• the polyol polymer is obtained as in Example 1, except that 2.77 g of AIBN are used as the initiator (0.4% relative to the total weight of the reaction mixture).
• the polymer polyol is obtained as in Example 1 except that 1.733 g of Luperox ® 575 is used as an initiator.
• the polymer polyol is obtained as in Example 1 except that 1.733 g of Luperox 531M80 ® is used as an initiator.
• Viscosities amounts of the residual monomer (styrene) and the solids contents of the polymer polyols obtained in Examples 1 to 2 and Comparative Examples 1 to 3 are measured. The viscosity is determined by a Brookfield viscometer at 25 ° C. The amount of the residual monomer (styrene) is analyzed by gas chromatography (GC) using Agilent 7890B with headspace.
• GC gas chromatography
• the solids content is analyzed by the following method.
• a sample of the final POP product is accurately prepared and weighed (the mass being M1 (0.1 mg)) and then dissolved in ethanol for a period of time.
• a high speed centrifuge is then used to separate the PPG and the copolymer (including styrene-acrylonitrile (SAN) and grafted SAN). The process is repeated three times and a vacuum oven is used to remove the remaining ethanol at 80 ° C.
• the polymer polyol is obtained as in Example 1 except that 1.274 g of a mixture of 72% by weight of Luperox ® 575, 18% by weight of Luperox 531M80 ® and 10% by weight of Luperox ® WAD is used as initiator (0.18% based on the total weight of the reaction mixture) and 1.274 g of 2-ethylhexyl thioglycolate is further mixed as a thiol chain transfer agent.
• the polymer polyol is obtained as in Example 1 except that 1.386 g of a mixture of 80% by weight of Luperox ® 575 and 20% by weight of Luperox 531M80 ® is used as an initiator (0.18% relative to the total weight of the reaction mixture) and 1.386 g of 2-ethylhexyl thioglycolate (EHTG) is further mixed as an agent. transfer of thiol-based chains.
• the polyol polymer is obtained as in Example 1, except that 4.16 g of AIBN are used as the initiator (0.6% based on the total weight of the reaction mixture).
• PPG polyether polyol
• Example 6 203 g of the PPG, 184.9 g of styrene, 79.7 g of acrylonitrile, 27.1 g of macromonomer (as defined in Example 1), 48 g of isopropanol and 1.348 g of a mixture of 80% by weight of Luperox ® 575 and 20% by weight of Luperox ® 531M80 as initiator (0.225% relative to the total weight of the reaction mixture) are mixed and added to the reactor in 1 hour by a metering pump. After completion of the addition, the temperature of the reactor is raised and maintained at 130 ° C for an additional 1 hour. Unreacted monomers and isopropanol are then removed under vacuum for 1 hour to obtain a polyol polymer as the final product.
• Example 6 Example 6
• the polymer polyol is obtained as in Example 5 except that 1.348 g of a mixture of 25% by weight of Luperox ® 575 and 75% by weight of Luperox 531M80 ® is used as an initiator.
• the polymer polyol is obtained as in Example 5 except that 1.348 g of a mixture of 50% by weight of Luperox ® 575 and 50% by weight of Luperox 531M80 ® is used as an initiator.
• Example 5 which uses 80% by weight of Luperox ® 575 + 20% by weight of Luperox ® 531M80 makes it possible to obtain a reduced viscosity and to limit the presence of large particles.

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