EP1045864A1 - Polymere obtenu par microsuspension renfermant des groupes acide - Google Patents

Polymere obtenu par microsuspension renfermant des groupes acide

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Publication number
EP1045864A1
EP1045864A1 EP99908813A EP99908813A EP1045864A1 EP 1045864 A1 EP1045864 A1 EP 1045864A1 EP 99908813 A EP99908813 A EP 99908813A EP 99908813 A EP99908813 A EP 99908813A EP 1045864 A1 EP1045864 A1 EP 1045864A1
Authority
EP
European Patent Office
Prior art keywords
component
graft
weight
polymer
microsuspension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99908813A
Other languages
German (de)
English (en)
Inventor
Graham Edmund Mckee
Heiner GÖRRISSEN
Walter Kastenhuber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP1045864A1 publication Critical patent/EP1045864A1/fr
Withdrawn legal-status Critical Current

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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
    • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
    • C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
    • 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
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium
    • C08F2/18—Suspension polymerisation
    • 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
    • C08F291/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00

Definitions

  • the invention relates to a microsuspension (graft) containing polymeric groups and a process for its preparation, and its use.
  • Polymer blends often contain rubber-elastic graft copolymers which are said to give the polymer blends increased toughness. They can also serve as matting agents in the polymer blends. To improve the properties, rubber-elastic graft copolymers have hitherto been used which have monomers containing acid and base groups in the structure.
  • EP-A-0 716 101 describes particulate, crosslinked copolymers and their use as matting agents.
  • the copolymers contain a matrix copolymer, particulate graft copolymers with an average particle size of 0.03 to 1 ⁇ m and copolymer with an average particle size of 0.5 to 50 ⁇ m.
  • a modified graft polymer based on a polybutyl acrylate rubber is used, in which the core is modified with acrylic acid as the monomer containing acid groups and the shell with N, N-dimethylamioioethyl acrylate as the monomer containing basic groups.
  • the core has an average particle size of 0.1 ⁇ m.
  • a non-rubber-elastic particulate copolymer is described which can contain acid groups.
  • EP-A-0 576 960 relates to molding compositions with a matt surface.
  • the molding compositions based on an impact-modified thermoplastic have a matting agent, which is a graft copolymer.
  • the graft base has one or more monomers containing acidic groups.
  • the graft shell has one or more monomers containing basic groups. - 2 -
  • EP-A-0 594 056 relates to a thermoplastic molding composition which contains a particulate graft polymer.
  • the graft polymer in turn has acidic groups in the core and basic groups in the graft shell.
  • EP-A-0 548 762 relates to impact modifiers and molding compositions containing them.
  • the impact modifier is a graft copolymer in which three graft shells are applied to a graft core.
  • the inner graft shell has acid groups.
  • the middle graft shell has basic groups.
  • the known systems have a complex structure and do not always lead to satisfactory matting effects in molding compositions.
  • the object of the present invention is to provide molding compositions which can be matted to a large extent in a simple manner without the mechanical properties suffering.
  • microsuspension polymer A with an average particle diameter of 0.08 to 100 ⁇ m from components All to A13, the total weight of which is 100% by weight
  • microsuspension graft polymer A al: 20 to 99.95% by weight of a graft core with an average particle diameter of 0.08 to 100 ⁇ m from a rubber-elastic polymer which is free of base groups, as component AI,
  • a2 0.05 to 80% by weight of at least one graft shell made of a polymer which is free of base groups, as component A2,
  • component AI and / or A2 is at least partially composed of ethylenically unsaturated monomers with free acid groups.
  • the compounds according to the invention are obtained in a process for the preparation of microsuspension (graft) polymers
  • microsuspension-containing (graft) polymers containing acid groups can be obtained by the microsuspension polymerization process which have an advantageous combination of mechanical properties, in particular notched impact strength and matting effect. It was found that the presence of acid groups in the microsuspension (graft) polymer increases the matting effect, so that smaller or fewer microsuspension (graft) polymer particles can be used which bring about better mechanics of the molding composition.
  • microsuspension polymerization is described, for example, in EP-A-0 716 101 and DE-A-44 43 886.
  • monomer droplets are suspended in an aqueous medium in the presence of a protective colloid under high shear forces or ultrasound. They are then polymerized using a radical polymerization initiator which is soluble in the monomer droplets.
  • the particle sizes obtained are 0.08 to 100 ⁇ m, preferably 0.2 to 50 ⁇ m, particularly preferably 0.4 to 30 ⁇ m, according to the invention.
  • the rubber-elastic microsuspension (graft) polymers can have a core / shell structure or can be designed as homogeneous particles.
  • monomers with free carboxyl groups are used as ethylenically unsaturated monomers with free acid groups.
  • monomers with sulfonic acid and phosphonic acid groups can also be used.
  • suitable monomers are primarily acrylic acid and methacrylic acid, further citraconic acid, crotonic acid, fumaric acid, itaconic acid, maleic acid and maleic anhydride, vinylsulfonic acid, vinylbenzenesulfonic acid, vinylphosphonic acid and cinnamic acid.
  • Acrylic acid and methacrylic acid are particularly preferred.
  • These monomers are used as component All in the rubber-elastic micro- Suspension polymers A 'used.
  • the content of component All in these rubber-elastic microsuspension polymers A ' is 0.05 to 20% by weight, preferably 0.1 to 15% by weight, particularly preferably 0.2 to 10% by weight.
  • copolymerizable monomers of component A12 are, for example, 1,3-dienes or C ,. 12 -, preferably C s - alkyl (meth) acrylates, as well as styrene, acrylonitrile, methyl methacrylate.
  • suitable monomers are described in Ulimann's Encyclopedia of Industrial Chemistry and Edition, Volume 19, pages 1 to 30.
  • n-butyl acrylate and 2-ethylhexyl acrylate are particularly suitable.
  • the dienes can be polymerized in a known manner in such a way that crosslinked, rubber-elastic polymers are obtained.
  • polyfunctional comonomers, ie crosslinking monomers are preferably used as component A13.
  • their content is preferably 0.1 to 8% by weight, particularly preferably 0.5 to 6% by weight.
  • Suitable monomers of this type are, for example, the divinyl and diallyl esters of dicarboxylic acids, such as succinic acid and adipic acid, the allyl and divinyl ethers of bifunctional alcohols, such as ethylene glycol and butane-1,4-diol, the esters of acrylic acid and methacrylic acid with the aforementioned biftinctional alcohols, 1,4-divinylbenzene and triallyl cyanurate.
  • Acrylic acid esters of tricyclodecenyl alcohol which is also referred to as dihydrodicyclopentadienyl acrylate, are particularly preferred.
  • Component A ' must be constructed.
  • the graft core contains free acid groups.
  • the at least one graft shell can also have further acid groups. However, preferably only the core contains free acid groups.
  • a polymer that is free of base groups with an average particle diameter of 0.08 to 100 ⁇ m is used as component AI.
  • polysiloxanes can also be used as the rubber-elastic polymer of the graft core.
  • the graft shell can be constructed in exactly the same way as the core and can be at least partially composed of ethylenically unsaturated monomers with free acid groups.
  • the core if the core contains no free acid groups, the shell contains free acid groups.
  • the core preferably contains free acid groups.
  • the structure of the graft polymers can be multi-stage, that is to say there can be several graft shells which can contain free acid groups.
  • the graft core and the graft shells should be free of base groups.
  • Examples of monomers which give a hard phase are styrene, ⁇ -methylstyrene, acrylonitrile, methacrylonitrile, (meth) acrylic acid esters, in particular methyl (meth) acrylate. Further suitable monomers are specified in Ullmanns Encyklopadie der Technischen Chemie, 4th edition, volume 19, pages 1 to 30.
  • the polymer of the graft shell is preferably composed of acrylonitrile and / or styrene and / or methyl methacrylate and optionally a crosslinker.
  • the crosslinkers for the core and the graft shell are described above.
  • the proportion of the graft core in the microsuspension graft polymers A is preferably 25 to 99.9% by weight, particularly preferably 40 to 99.8% by weight.
  • the proportion of the graft shell (s) is preferably 0.1 to 75% by weight, particularly preferably 0.2 to 60% by weight.
  • the proportion of ethylenically unsaturated monomers with free acid groups, based on the microsuspension (graft) polymer is 0.05 to 20% by weight, particularly preferably 0.1 to 10% by weight, in particular 0.2 to 8% by weight. %. With very low levels of graft shell, the graft shell mostly consists predominantly of monomers with free acid groups.
  • Microsuspension graft polymers A with a core of a C 1 are particularly preferred.
  • microsuspension (graft) polymers are preferably obtained as follows:
  • the liquid monomer or liquid monomer mixture which is to be polymerized to component A 'or component AI is mixed with water and a protective colloid and, if appropriate, an emulsifier.
  • the polymerization initiator is either added now or only after the monomer has been dispersed or after the dispersion has been heated.
  • a dispersion of minute monomer droplets in water is obtained from the heterogeneous mixture by intensive stirring at high speed.
  • Intensive mixers of any type are suitable for mixing.
  • the desired particle size within the defined range can be determined, for example, by taking light microscopic images and counting the number of particles which have a specific diameter.
  • the polymerization is started by heating the dispersion.
  • the reaction is then carried out with moderate stirring, during which the droplets are no longer divided, and is continued until the conversion, based on the monomers, is above 50%, preferably above 85%.
  • the reaction with the monomers from which the corresponding shells are formed is continued in a manner known per se.
  • the grafting can also begin when the polymerization conversion of the core monomer is still incomplete and is above 50%, preferably above 85%.
  • the shell and core form a more fluid transition compared to the sharper further delimitation of core and shell polymer in the event of initially complete conversion of the (core) monomers.
  • the monomers are generally dispersed at a temperature of 0 to 100 ° C., preferably at room temperature. As a rule, 0.2 to 10 kg of water are used per kilogram of the monomers.
  • the protective colloids used to stabilize the dispersion are water-soluble polymers which envelop the monomer droplets and the polymer particles formed therefrom and in this way protect them from coagulation.
  • Suitable protective colloids are cellulose derivatives such as carboxymethyl cellulose and hydroxymethyl cellulose, poly-N-vinyl pyrrolidone, polyvinyl alcohol and polyethylene oxide, anionic polymers such as polyacrylic acid and cationic polymers such as poly-N-vinyl imidazole.
  • the amount of protective colloids is preferably 0.1 to 5% by weight, based on the total mass of the (core) monomers.
  • the reaction can also be carried out in the presence of emulsifiers.
  • Molecular surface-active compounds for example of the anionic or cationic soap type, can again be used for this purpose.
  • alkali salts especially sodium salts of C 12 . 18- Paraffin sulfonic acid can be used.
  • the proportion of the protective colloid is preferably 0.01 to 5% by weight and that of the emulsifier is 0.01 to 5% by weight, in each case based on the total mass of the (core) monomers.
  • the emulsifier By using the emulsifier, relatively small particles are formed, which nevertheless have a good matt effect. The matt effect of the microsuspension polymers can thus be increased again.
  • Free radical formers are suitable as polymerization initiators, in particular those which are soluble in the monomers and preferably have a half-life of 10 hours when the temperature is between 25 and 150 ° C. Examples of more suitable
  • Initiators are peroxides such as dilauroyl peroxide, peroxosulfates, tert-butyl perpivalate, - y -
  • Suitable initiators can be used to produce the graft core and the graft shells.
  • the amount of initiators is generally 0.1 to 2.5% by weight, based on the amount of monomers.
  • reaction mixture preferably contains buffer substances, such as Na 2 HPO 4 / NaH 2 PO 4 or Na citrate / citric acid, in order to set an essentially constant pH.
  • buffer substances such as Na 2 HPO 4 / NaH 2 PO 4 or Na citrate / citric acid
  • molecular weight regulators such as ethylhexyl thioglycolate or didecyl mercaptan are generally added during the polymerization, in particular of the shell-building monomers.
  • the polymerization temperature of the core monomers is generally 25 to 150 ° C, preferably 50 to 120 ° C.
  • the grafting of the shells is generally carried out at a temperature of 25 to 150 ° C., preferably 50 to 120 ° C.
  • the lower limit values of these ranges correspond to the decomposition temperatures of the polymerization initiators used in each case.
  • microsuspension (graft) polymers according to the invention are advantageously used in the production of molding compositions.
  • the invention also relates to a molding composition comprising components A to D, the total weight of which is 100% by weight,
  • graft microsuspension
  • b 15 to 99% by weight of a polymer matrix, preferably a polymer made from styrene, ⁇ -methylstyrene, acrylonitrile, methacrylonitrile, (meth) acrylic acid ester or mixtures thereof as component B,
  • component D 0 to 40% by weight of further additives as component D.
  • the rubber-elastic particles are incorporated into the melt of matrix B, so that the molding composition formed is composed of thermoplastic matrix B and the graft polymer particles dispersed therein.
  • the rule is that the outermost shell and the matrix material are compatible or partially compatible with one another. In many cases, this means that their outer graft shell consists of the same or as similar a material as the base polymer.
  • the technically most important base polymers are homopolymers of styrene, methyl acrylate, (C, -C 4 ) alkyl methacrylates and acrylonitrile, copolymers of these monomers and other comonomers such as methacrylonitrile, ie these monomers and monomer mixtures are suitable depending on the structure of the base polymer B to build up the outer graft shell.
  • the outer shell is to be relatively hard, intermediate shells made of a less hard material can be recommended.
  • a shell made of soft material for example the core material, can adjoin the first hard grafting shell, as a result of which the properties of the thermoplastic molding compositions prepared from B and the graft polymer particles A and the moldings produced therefrom can often be further improved.
  • the relationships between the nature of the two components in the molding compounds and the material properties correspond to those that apply to the base material. - 11 -
  • rial and graft polymers are known, which are prepared by emulsion polymerization.
  • base materials B other than those mentioned, e.g. Polyesters, polyamides, polyvinyl chloride, polycarbonates and polyoxymethylene. In these cases, compatible and partially compatible graft shells can be easily determined through a few preliminary tests.
  • Compatibility is understood as miscibility at the molecular level.
  • One polymer is considered to be compatible with another if the molecules of both polymers are statistically distributed in the solid state, i.e. if the concentration of a polymer along any vector neither increases nor decreases. Conversely, it is considered incompatible if two phases are formed in the solid state, which are separated from one another by a sharp phase boundary. Along a vector intersecting the phase interface, the concentration of one polymer suddenly increases from zero to 100% and that of the other from 100% to zero.
  • partially compatible polymers are the pairs polymethyl methacrylate / -
  • solubility parameter as a quantitative measure is e.g. the Polymer Handbook, ed. J. Brandrup and E.H. Immergut, 3rd edition, Wiley, New York 1989, pp. VII / 519-VII / 550.
  • the graft polymers according to the invention are generally used in amounts of 1 to 60% by weight, preferably 2 to 45% by weight, based on the amount of their mixture with the base polymer. Shaped bodies made from such mixtures are highly light-scattering and therefore particularly matt to opaque.
  • concentrations of 2 to 10% by weight of the graft polymers are recommended. Since only a relatively small increase in impact strength would result at these low concentrations, conventional, very finely divided rubber-elastic modifiers can be used in the usual amounts for this, minus the amount of the graft polymer according to the invention used as a matting agent.
  • ABS styrene-acryl
  • the particles according to the invention achieve a matting effect, often without impairing the mechanical properties, as can be observed with conventional matting agents such as chalk or silica gel. - 13 -
  • the protective colloids used in the production of the core polymers have, because of their higher molecular mass and greater space filling of the molecules, much less effort than the low molecular weight emulsifiers to migrate to the surface of the plastic. High molecular protective colloids are therefore far less likely to exude from a molded part.
  • the molding compositions modified with the particles according to the invention and the molded parts produced therefrom have the advantages of improved printability and so-called anti-blocking properties, i.e. the surfaces of the molded parts "roughened” by the particles do not adhere to one another.
  • This effect which is due to adhesion, is known, for example, from plastic films.
  • Films containing particles according to the invention and layered on top of one another in a stack can be separated from one another without any problems, in contrast to films which do not contain such particles.
  • the molding compositions can contain fibrous or particulate fillers as component C.
  • fillers are plastic or glass fibers, such as E, A or C glass fibers. These can be equipped with a size and an adhesion promoter.
  • suitable fillers and reinforcing materials are glass balls, mineral fibers, whiskers, aluminum oxide fibers, mica, quartz powder and tungstenite.
  • the molding compositions can also contain additives of all kinds as component D.
  • additives of all kinds as component D for example, Lubricants and mold release agents, pigments, flame retardants, dyes, stabilizers and antistatic agents, all of which are added in the usual amounts.
  • the molding compositions according to the invention can be prepared by mixing processes known per se, for example by incorporating the particulate graft polymer into the base material at temperatures above the melting point of the base material. - 14 -
  • the following batch was stirred under nitrogen with a Dispermat at 7000 rpm for 20 minutes.
  • the Dispermat came from VMA-Getzmann GmbH, D-51580 Reichshof and was provided with a 5 cm tooth lock washer.
  • the emulsion was carried out over a period of 100 minutes. Polymerization was continued for 60 minutes. 254.1 g of water were then added to the batch, followed by 330.6 g of styrene and 110.2 g of acrylonitrile, the monomers being added as a feed within 40 minutes. The mixture was stirred for a further 120 minutes at 65 ° C. in order to polymerize the batch.
  • Example 1 was repeated with the following changes: Instead of 254.1 g of water, 433.1 g of water and 138.0 g of a 10% strength Mowiol 8-88 solution in water were used before the SAN monomer addition and the amount of monomers in the second stage increased to 517.6 g (styrene) and 172.5 g (acrylonitrile). After one hour of post-reaction time, 0.9 g of potassium persulfate in 10 g of water were added to the reaction mixture. The mixture was then polymerized for a further 120 minutes.
  • Example 2 was repeated, but only 12.5 g instead of 25 g of the 40% K30 emulsifier solution was used in step 1.
  • Example 1 was repeated without acrylic acid.
  • Example 2 was repeated without acrylic acid.
  • Example 3 was repeated without acrylic acid.
  • Example 2 was repeated without acrylic acid and emulsifier K30.
  • a copolymer of 65% by weight of styrene and 35% by weight of acrylonitrile was produced by the process of continuous solution polymerization, as described in the plastics manual, ed. R. Vieweg and G. Daumiller, Vol. V, "Polystyrene", Carl Hanser Verlag Kunststoff 1969, pages 122 to 124, is described.
  • the viscosity number VZ (determined in accordance with DIN 53 726 at 25 ° C., 0.5% by weight in dimethylformamide) was 80 ml / g.
  • the aqueous dispersions of the examples were pumped into the polymer melt in the extruder.
  • the water was removed along the extruder and the finished mixture was extruded and granulated.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Graft Or Block Polymers (AREA)

Abstract

L'invention concerne un polymère A' obtenu par microsuspension, présentant un diamètre moyen de particules compris entre 0,08 à 100 νm. Ce polymère est constitué des composants A11 à A13 dont le poids total est égal à 100 % en poids, a11 représentant 0,05 à 20 % en poids de monomères éthyléniquement insaturés comportant des groupes acide libres en tant que composant A11; a12 représentant 80 à 99,95 % en poids de monomères copolymérisables, dont les homopolymères sont exempts de groupes basiques, en tant que composant A12; a13 représentant 0 à 10 % en poids de monomères réticulants en tant que composant A13.
EP99908813A 1998-01-21 1999-01-21 Polymere obtenu par microsuspension renfermant des groupes acide Withdrawn EP1045864A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19802120A DE19802120A1 (de) 1998-01-21 1998-01-21 Säuregruppen enthaltendes Mikrosuspensionspolymerisat
DE19802120 1998-01-21
PCT/EP1999/000394 WO1999037689A1 (fr) 1998-01-21 1999-01-21 Polymere obtenu par microsuspension renfermant des groupes acide

Publications (1)

Publication Number Publication Date
EP1045864A1 true EP1045864A1 (fr) 2000-10-25

Family

ID=7855225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99908813A Withdrawn EP1045864A1 (fr) 1998-01-21 1999-01-21 Polymere obtenu par microsuspension renfermant des groupes acide

Country Status (3)

Country Link
EP (1) EP1045864A1 (fr)
DE (1) DE19802120A1 (fr)
WO (1) WO1999037689A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8718036D0 (en) * 1987-07-30 1987-09-03 Tioxide Group Plc Polymeric particles
US5284881A (en) * 1989-09-06 1994-02-08 Nippon Paint Co., Ltd. Composite hollow particles
WO1992000719A1 (fr) * 1990-07-09 1992-01-23 Dowbrands Inc. Composition de maquillage
SG84480A1 (en) * 1992-04-10 2001-11-20 Rohm & Haas Polymeric particles
DE4437501A1 (de) * 1994-10-20 1996-04-25 Basf Ag Thermoplastische Formmassen
DE4443966A1 (de) * 1994-12-09 1996-06-13 Basf Ag Thermoplastische Formmassen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9937689A1 *

Also Published As

Publication number Publication date
DE19802120A1 (de) 1999-07-22
WO1999037689A1 (fr) 1999-07-29

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