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US20100256299A1 - Process for obtaining low free monomer levels in a block copolymer emulsion prepared with (reverse) iodine transfer polymerisation - Google Patents

Process for obtaining low free monomer levels in a block copolymer emulsion prepared with (reverse) iodine transfer polymerisation Download PDF

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Publication number
US20100256299A1
US20100256299A1 US12/664,922 US66492208A US2010256299A1 US 20100256299 A1 US20100256299 A1 US 20100256299A1 US 66492208 A US66492208 A US 66492208A US 2010256299 A1 US2010256299 A1 US 2010256299A1
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Prior art keywords
block
process according
vinyl monomers
block copolymer
methacrylic acid
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US12/664,922
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English (en)
Inventor
Tijs Nabuurs
Gerardus Cornelis Overbeek
Michael Arnoldus Jacobus Schellekens
Danny Visser
Frank Vaes
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DSM IP Assets BV
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DSM IP Assets BV
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Assigned to DSM IP ASSETS B.V. reassignment DSM IP ASSETS B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VISSER, DANNY, NABUURS, TIJS, OVERBEEK, GERARDUS CORNELIS, SCHELLEKENS, MICHAEL ARNOLDUS JACOBUS, VAES, FRANK
Publication of US20100256299A1 publication Critical patent/US20100256299A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • 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
    • C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
    • 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
    • C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
    • C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D153/00—Coating compositions based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • 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
    • C08F2438/00—Living radical polymerisation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials

Definitions

  • the present invention concerns a process for obtaining low free monomer levels in an aqueous emulsion comprising a block copolymer where the block copolymer is prepared with (reverse) iodine transfer polymerisation, the aqueous emulsion comprising a block copolymer obtained by the process and the use of the aqueous emulsion for coating, adhesive and printing ink compositions.
  • Control over polymer chain architecture, resulting in for instance block copolymers, may be very beneficial in achieving improved properties when the polymer is used for instance in coating, adhesive and printing ink compositions.
  • Several polymerisation techniques also known as “living polymerisation techniques” have been found to be able to deliver such kind of control, such as for example Reversible Addition Fragmentation Chain Transfer (RAFT), Atom Transfer Radical Polymerisation (ATRP) and Nitroxide Mediated Controlled Radical Polymerisations (NRP).
  • RAFT Reversible Addition Fragmentation Chain Transfer
  • ATRP Atom Transfer Radical Polymerisation
  • NRP Nitroxide Mediated Controlled Radical Polymerisations
  • RITP is described in for example U.S. Pat. No. 7,078,473 which discloses a radical polymerisation process for the preparation of halogenated polymers and block copolymers using molecular iodine and a radical-generating agent.
  • US 2007/0066781 discloses a process for preparing iodinated substances having a molecular mass of less than 2000 using molecular iodine and a radical-generating agent.
  • WO 2004/009648 and US 2004/0054108 disclose a method for making a block or gradient copolymer comprising a step of radically polymerising a mixture of monomers to a iodine atom-containing polymeric compound, wherein the iodine atom-containing polymeric compound comprises at least 50 mol % of methacrylate monomers.
  • WO 2004/009644 discloses a method for making a methacrylate unit-containing polymer with a polydispersity of less than 1.7 in the presence of a radical precursor and iodine or sulphonyl iodide.
  • EP 0947527 discloses a controlled free-radical polymerisation process for forming waterborne block copolymers by an emulsion polymerisation process using for example degenerative iodine transfer polymerisation processes.
  • WO 03/097704 discloses radical polymerisation methods, including the use of molecular iodine, for making halogenated polymers, including block copolymers where at least one block is halogenated.
  • iodine functional polymer chains will then act as chain transfer agents for growing radical chains.
  • the former iodine functional chain becomes an active radical, while the former active radical becomes iodine end capped.
  • a growing radical chain has two options, it can propagate by adding monomer units or it can undergo chain transfer by reacting with a iodine functional compound. In this way the radical polymerisation becomes a controlled polymerisation.
  • RITP a disadvantage with RITP is that it yields a very high free monomer level, i.e. the rate of monomer conversion is less than 99.5%.
  • an aqueous emulsion comprising a block copolymer, which process comprises the following steps:
  • the free monomer level may be measured by gas chromatography (GC).
  • GC gas chromatography
  • a free monomer level of 1000 ppm at 40% solids is equivalent to a monomer conversion of 99.75%. This is considered as an acceptable level of free monomers in a general emulsion.
  • a free monomer level of 500 ppm at 40% solids is equivalent to a monomer conversion of 99.87%. This is considered as a good level of free monomers in a general emulsion.
  • a free monomer level of ⁇ 100 ppm at 40% solids is equivalent to a monomer conversion of ⁇ 99.98%. This is considered as an excellent level of free monomers in a general emulsion.
  • the aqueous emulsion has a free vinyl monomer level ⁇ 1000 ppm when having a solids content of 35 +/ ⁇ 15 wt %, more preferably 35+/ ⁇ 10 wt % and most preferably 35+/ ⁇ 5 wt %.
  • the aqueous emulsion has a free vinyl monomer level ⁇ 800 ppm, more preferably ⁇ 500 ppm, most preferably ⁇ 400 ppm and especially ⁇ 300 ppm when having a solids content of ⁇ 20 wt %.
  • the iodine atom containing block [A] is selected from the group consisting of vinyl polymers, polyurethanes, polyesters, polyethers, polyolefins, alkyds, and or mixtures thereof.
  • the iodine atom containing block [A] is obtained by the polymerisation of vinyl monomers in the presence of
  • iodine molecular iodine and compounds that can form iodine such as I 3 ⁇ , N-iodosuccinimide etc.
  • iodine atom containing intermediate vinyl polymer is described in WO 04/009648.
  • the polymerisation of vinyl monomers in step I in the presence of the iodine atom containing block [A] is carried out by solution polymerisation.
  • the polymerisation of vinyl monomers in step I is carried out by solution polymerisation in an organic solvent.
  • the resultant copolymer is a block copolymer with block [A] and the vinyl monomers polymerised in step I become block [B] and any optional further blocks [C] depending on the type of polymerisation carried out, such as multi-stage polymerisations.
  • the block copolymer contains a first block [A], a second block [B] and optionally one or more blocks [C].
  • the number average molecular weight of block [A] is in the range of from 200 to 60,000 g/mol, more preferably from 500 to 30,000 g/mol and most preferably from 700 to 15,000 g/mol.
  • the number average molecular weight of block [B] is in range of from 200 to 60,000 g/mol, more preferably from 500 to 30,000 g/mol and most preferably from 700 to 15,000 g/mol.
  • the block copolymer has an average particle size of ⁇ 600 nm, as determined by light scattering, more preferably ⁇ 300 nm and most preferably ⁇ 250 nm.
  • the post-polymerisation reaction to reduce the free monomer level is done with a redox couple comprising an organic or inorganic peroxide or hydroperoxide and a reducing agent.
  • a redox couple comprising an organic or inorganic peroxide or hydroperoxide and a reducing agent.
  • intermediate reactants such as iron ions is optional.
  • Preferred hydroperoxides are t-butyl hydroperoxide, cumyl hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, isopropylcumyl hydroperoxide, and hydrogenperoxide.
  • Preferred inorganic peroxides are sodium, potassium or ammonium peroxide salts.
  • Preferred organic peroxides are dilauryl peroxide, dibenzoyl peroxide, t-butyl-per-2-ethyl hexanoate, t-butyl perbenzoate, dicumyl peroxide, di-t-butyl peroxide.
  • Preferred reducing agents are ascorbic acid, iso-ascorbic acid, sodium metabisulphite, sodium dithionite and sodium formaldehyde sulfoxylate.
  • the post-polymerisation reaction to reduce the free monomer level may also be carried out by the reaction of an initiator selected from the group consisting of azo functional initiators, organic peroxides, inorganic peroxides or mixtures thereof.
  • Preferred azo functional initiators are 2,2′-azodi isobutyronitrile, 2,2′-azodi(2-methylbutyronitrile), VAZO® 68 WSP, VAZO® 56, VAZO® 52 (ex. DuPont) or VA-086 (ex. WAKO Chemicals).
  • More than one post-polymerisation reaction may be carried out.
  • Blocks [A] and [B] should be different.
  • the difference can be in the Tg of the blocks, the hydrophilic or hydrophobic nature of the monomers or the concentration of functional monomers within the blocks or combinations thereof.
  • one of the blocks has a Tg ⁇ 20° C., more preferably ⁇ 0° C. and most preferably ⁇ 15° C.
  • the other block preferably has a Tg of ⁇ 10° C., more preferably ⁇ 25° C., most preferably ⁇ 30° C., and especially ⁇ 50° C.
  • the difference in Tg between blocks [A] and [B] is ⁇ 40° C.
  • one of the blocks preferably contains ⁇ 5 wt % of hydrophilic groups (for example acidic or hydroxyl functional groups), more preferably ⁇ 10 wt % and especially ⁇ 20 wt %, while the other block would contain ⁇ 2 wt %, more preferably ⁇ 1 wt % and most preferably no hydrophilic groups. It is also possible to induce a difference in hydrophilic or hydrophobic nature between the blocks by incorporating very hydrophobic monomers in the hydrophobic segment.
  • hydrophilic groups for example acidic or hydroxyl functional groups
  • Such monomers can be for instance 2-ethyl hexyl(meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, styrene or modified styrene monomers, or a-methyl styrene.
  • this block may still contain low concentrations of hydrophilic monomers.
  • Blocks [A] and [B] may contain functional monomers. These can be 1) acid monomers for enhanced stability and/or adhesion, 2) monomers that may typically yield improved adhesion, 3) crosslinking monomers that also may improve adhesion properties, 4) quaternary ammonium groups for antimicrobial activity, anti static properties or reduced grain raising, or 5) monomers that may induce semi-crystalline behaviour. If any of these monomers are used it is preferred that blocks [A] and [B] comprise different functionalities or if similar functionalities then in different concentrations.
  • the acid value of the block copolymer is preferably ⁇ 120 mg KOH/g of solid polymer, more preferably ⁇ 80 mg KOH/g, even more preferably ⁇ 60 mg KOH/g, most preferably ⁇ 50 mg KOH/g and especially in the range of from 2 to 50 mg KOH/g of solid polymer.
  • Block [B] and block [A] are derived from free-radically polymerisable olefinically unsaturated monomers, which are also usually referred to as vinyl monomers, and can contain polymerised units of a wide range of such vinyl monomers, especially those commonly used to make binders for the coatings industry.
  • vinyl monomers which may be used to form the blocks include but are not limited to olefinically unsaturated monomers such as 1,3-butadiene, isoprene, divinyl benzene, aromatic vinyl monomers such as styrene, ⁇ -methyl styrene; vinyl monomers such as acrylonitrile, methacrylonitrile; vinyl halides such as vinyl chloride; vinylidene halides such as vinylidene chloride; vinyl esters such as vinyl acetate, vinyl propionate, vinyl laurate; vinyl esters of versatic acid such as VeoVa 9 and VeoVa 10 (VeoVa is a trademark of Resolution); heterocyclic vinyl compounds; alkyl esters of mono-olefinically unsaturated dicarboxylic acids such as di-n-butyl maleate and di-n-butyl fumarate and, in particular, esters of acrylic acid and methacrylic acid of formula CH 2 ⁇ CR 5 —COOR 4 where
  • the vinyl monomers may also include vinyl monomers carrying functional groups as exemplified below. These may be in-chain, pendant or terminal groups.
  • Water-dispersing functional groups provide the facility of self-dispersibility, stability, solubility in water and/or a substrate.
  • the water dispersing groups may be ionic, potentially ionic, nonionic or a mixture of such water-dispersing groups.
  • Preferred vinyl monomers providing nonionic water-dispersing groups include alkoxy polyethylene glycol (meth)acrylates, hydroxy polyethylene glycol (meth)acrylates, alkoxy prolyproplene glycol (meth)acrylates and hydroxy polypropylene glycol (meth)acrylates, preferably having a number average molecular weight of from 350 to 3,000.
  • Vinyl monomers providing ionic or potentially ionic water-dispersing groups include vinyl monomers providing anionic or potentially anionic, cationic or potentially cationic water-dispersing groups.
  • Preferred vinyl monomers providing anionic or potentially anionic water-dispersing groups include acrylic acid, itaconic acid, maleic acid, ⁇ -carboxyethyl acrylate, monoalkyl maleates (for example monomethyl maleate and monoethyl maleate), citraconic acid, styrenesulphonic acid, vinylbenzylsulphonic acid, vinylsulphonic acid, acryloyloxyalkyl sulphonic acids (for example acryloyloxymethyl sulphonic acid), 2-acrylamido-2-alkylalkane sulphonic acids (for example 2-acrylamido-2-methylethanesulphonic acid), 2-methacrylamido-2-alkylalkane sulphonic acids (for example 2-methacrylamido-2-methylethanesulphonic acid), mono(acryloyloxyalkyl)phosphates (for example, mono(acryloyloxyethyl)phosphate and mono(3-acryloyloxypropyl)phosphate
  • the anionic or potentially anionic water-dispersing groups of the block copolymer may be neutralised before during or after the emulsification step II.
  • Preferred neutralising agents include ammonia, trimethylamine, dimethyl ethanol amine, dimethyl butyl amine, sodium hydroxide, potassium hydroxide and or lithium hydroxide.
  • Preferred vinyl monomers providing quaternary ammonium and/or quaternisable amine functional group include but are not limited to 2-trimethylammoniumethyl (meth)acrylate chloride, 2-dimethylaminoethyl (meth)acrylate methyl bromide, 2-dimethylaminoethyl (meth)acrylate methyl iodide, 2-dimethylaminoethyl (meth)acrylate dimethyl sulphate, 3-trimethylammoniumpropyl (meth)acrylamide chloride ((M)APTAC), vinylbenzyl trimethylammonium chloride, diallyldimethylammonium chloride, 2-dimethylaminoethyl (meth)acrylate (DMAE(M)A), 2-aminoethyl (meth)acrylate, 2-diethylaminoethyl (meth)acrylate, 3-dimethylaminopropyl (meth)acrylate, 3-dimethylamino-2,2-d
  • block [A] and [B] together comprise 0 to 2 wt % of methacrylic acid, more preferably block [A] and [B] together comprise 0 to 1 wt % of methacrylic acid and most preferably block [A] and [B] together comprise 0 wt % of methacrylic acid.
  • the block copolymer comprises 0 to 2 wt % of methacrylic acid, more preferably the block copolymer comprises 0 to 1 wt % of methacrylic acid and most preferably the block copolymer comprises 0 wt % of methacrylic acid.
  • Preferably block [A] comprises 5 to 25 wt % and more preferably 8 to 22 wt % of vinyl monomers bearing ionic or potentially ionic water-dispersing groups not including methacrylic acid.
  • Preferably block [B] comprises 0 to 15 wt % and more preferably 0 to 10 wt % of vinyl monomers bearing ionic or potentially ionic water-dispersing groups not including methacrylic acid.
  • block [A] and block [B] together comprise 3.0 to 18 and more preferably 3.5 to 15 wt % of vinyl monomers bearing ionic or potentially ionic water-dispersing groups not including methacrylic acid.
  • the vinyl monomers bearing ionic or potentially ionic water-dispersing groups are selected from the group consisting of 2 dimethylaminoethyl(meth)acrylate, 3-trimethylammoniumpropyl(meth)acrylamide chloride, acrylic acid, ⁇ -carboxyethyl acrylate, itaconic acid and mixtures thereof.
  • the vinyl monomers bearing ionic or potentially ionic water-dispersing groups are anionic or potentially anionic water-dispersion groups.
  • the vinyl monomers bearing anionic or potentially anionic water-dispersing groups are selected from the group consisting of acrylic acid, ⁇ -carboxyethyl acrylate, itaconic acid and mixtures thereof.
  • Preferred vinyl monomers providing crosslinkable functional groups include hydroxyl functional monomers, epoxide functional monomers, acid functional monomers, carbonyl functional monomers or silane functional monomers.
  • vinyl monomers providing carbonyl functional groups include acrolein, methacrolein, crotonaldehyde, 4-vinylbenzaldehyde, vinyl alkyl ketones of 4 to 7 carbon atoms such as vinyl methyl ketone.
  • Further examples include acrylamidopivalaldehyde, methacrylamidopivalaldehyde, 3-acrylamidomethyl-anisaldehyde, diacetone acrylate and diacetone methacrylate, and keto-containing amides such as diacetone acrylamide.
  • Preferred vinyl monomers providing crystallisable monomers include decyl (meth)acrylate, lauryl (meth)acrylate and stearyl (meth)acrylate.
  • an aqueous emulsion comprising a block copolymer obtained by a process according to the invention.
  • the aqueous emulsion has a pH in the range of from 2 to 11, more preferably 2 to 9, even more preferably 2.5 to 8.5 and most preferably 5 to 8.5.
  • the aqueous emulsions obtained by the process of the present invention may be applied to a variety of substrates including wood, board, metals, stone, concrete, glass, cloth, leather, paper, plastics, foam and the like, by any conventional method including brushing, dipping, flow coating, spraying, flexo printing, gravure printing, ink-jet printing, any other graphic arts application methods and the like.
  • the aqueous carrier medium is removed by natural drying or accelerated drying (by applying heat) to form a coating.
  • a coating, an adhesive, a polymeric film, a printing ink and/or an overprint lacquer obtained from the aqueous emulsions obtained by the process of the present invention is provided.
  • the aqueous emulsions obtained by the process of the present invention may contain conventional ingredients; examples include pigments, dyes, emulsifiers, surfactants, plasticisers, thickeners, heat stabilisers, levelling agents, anti-cratering agents, fillers, sedimentation inhibitors, UV absorbers, antioxidants, drier salts, organic co-solvents, wetting agents and the like introduced at any stage of the production process or subsequently. It is possible to include an amount of antimony oxide in the dispersions to enhance the fire retardant properties.
  • the aqueous emulsions may comprise additional polymers not prepared using RITP.
  • Suitable organic co-solvents which may be added during the process or after the process during formulation steps are well known in the art and include xylene, toluene, methyl ethyl ketone, acetone, diethylene glycol and 1-methyl-2-pyrrolidinone.
  • an external crosslinking agent may be added to the aqueous emulsions obtained by the process of the present invention to aid crosslinking during or after drying.
  • the solids content of the aqueous emulsions obtained by the process of the present invention is preferably within the range of from 20 to 60 wt %, and most preferably within the range of from 30 to 50 wt %.
  • the resultant block copolymer solution was cooled to 60° C. and 34.1 parts of dimethyl ethanolamine were added.
  • the block copolymer was emulsified by adding 440 parts of demineralised water.
  • the monomer conversion was 97%, corresponding to a free monomer content of the block copolymer emulsion of 11700 ppm.
  • step II To the block copolymer emulsion obtained after step II) 0.7 parts of t-butyl hydroperoxide and 0.3 parts of water were added. Next a solution of 1.5 parts of i-ascorbic acid in 29.5 parts of water was added over a period of 30 minutes.
  • the final free monomer level was 680 ppm and the solids content was 41%, corresponding to a final monomer conversion of 99.82%.
  • Block copolymer emulsion were prepared according to the process for example 1 using components as listed in Table 1 below.
  • All of the emulsions prepared in Examples 1 to 6 had a particle size in the range of from 50 to 350 nm.
  • a block copolymer emulsion was prepared according to the process for Example 1 using components as listed in Table 1 below, where methacrylic acid was used instead of acrylic acid. However the after step II was completed the emulsion was extremely unstable and step III could not be carried out.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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US12/664,922 2007-06-21 2008-06-17 Process for obtaining low free monomer levels in a block copolymer emulsion prepared with (reverse) iodine transfer polymerisation Abandoned US20100256299A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07012108 2007-06-21
EP07012108.2 2007-06-21
PCT/EP2008/057605 WO2008155324A1 (fr) 2007-06-21 2008-06-17 Procédé permettant d'obtenir de faibles niveaux de monomères libres dans une émulsion de copolymère séquencé préparée par polymérisation par transfert d'iode (inverse)

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US13/648,080 Abandoned US20130030118A1 (en) 2007-06-21 2012-10-09 Process for obtaining low free monomer levels in a block copolymer emulsion prepared with (reverse) iodine transfer polymerisation
US14/140,356 Expired - Fee Related US9096756B2 (en) 2007-06-21 2013-12-24 Process for obtaining low free monomer levels in a block copolymer emulsion prepared with (reverse) iodine transfer polymerisation

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DE102008034106A1 (de) * 2008-07-21 2010-01-28 Evonik Röhm Gmbh Blockcopolymere auf (Meth)acrylatbasis mit A-P-Struktur
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US9096756B2 (en) 2015-08-04
EP2158237A1 (fr) 2010-03-03
US20130030118A1 (en) 2013-01-31
WO2008155324A1 (fr) 2008-12-24
EP2158237B1 (fr) 2012-10-24
US20140107290A1 (en) 2014-04-17

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