US20100143697A1 - Elastic particle foam based on polyolefin/styrene polymer mixtures - Google Patents

Elastic particle foam based on polyolefin/styrene polymer mixtures Download PDF

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US20100143697A1
US20100143697A1 US12/595,275 US59527508A US2010143697A1 US 20100143697 A1 US20100143697 A1 US 20100143697A1 US 59527508 A US59527508 A US 59527508A US 2010143697 A1 US2010143697 A1 US 2010143697A1
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thermoplastic
polymer
weight
produce
particles
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Carsten Schips
Klaus Hahn
Georg Gräßel
Daniela Longo
Jens Assmann
Andreas Gietl
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BASF SE
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BASF SE
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Assigned to BASF SE reassignment BASF SE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GIETL, ANDREAS, ASSMAN, JENS, GRAESSEL, GEORG, LONGO, DANIELA, HAHN, KLAUS, SCHIPS, CARSTEN
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/16—Making expandable particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/10—Applying counter-pressure during expanding
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/16—Making expandable particles
    • C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/22—After-treatment of expandable particles; Forming foamed products
    • C08J9/224—Surface treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/04—Foams characterised by their properties characterised by the foam pores
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2325/00—Characterised by the use of homopolymers or 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; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249978—Voids specified as micro

Definitions

  • the invention relates to thermoplastic particle foams which have cells having a mean cell size in the range from 20 to 500 ⁇ m and in which the cell membranes have a nanocellular or fibrous structure having pore or fiber diameters below 1500 nm, and also to processes for producing them.
  • Expandable polymer mixtures comprising styrene polymers, polyolefins and, if appropriate, solubilizers such as hydrogenated styrene-butadiene block copolymers are known from, for example, DE 24 13 375, DE 24 13 408 or DE 38 14 783.
  • the foams which can be obtained therefrom are said to have better mechanical properties, in particular a better elasticity and a reduced brittleness at low temperatures, and also insensitivity toward solvents such as ethyl acetate and toluene, compared to foams composed of styrene polymers.
  • the blowing agent retention capability and the foamability of the expandable polymer mixtures to low densities are not sufficient for processing.
  • WO 2005/056652 describes particle foam moldings which have a density in the range from 10 to 100 g/l and can be obtained by fusion of prefoamed foam particles produced from expandable, thermoplastic polymer beads.
  • the polymer beads comprise mixtures of styrene polymers and other thermoplastic polymers and can be obtained by melt impregnation and subsequent underwater pelletization under pressure.
  • elastic particle foams comprising expandable interpolymer particles are known (e.g. US 2004/0152795 A1).
  • the interpolymers can be obtained by polymerization of styrene in the presence of polyolefins in aqueous suspension and form an interpenetrating network of styrene polymers and olefin polymers.
  • the blowing agent diffuses rapidly out of the expandable polymer particles, so that they have to be stored at low temperatures and display satisfactory foamability for only a short time.
  • WO 2005/092959 describes nanoporous polymer foams which can be obtained from multiphase polymer mixtures which comprise blowing agent and have domains in the range from 5 to 200 nm.
  • the domains preferably comprise core-shell particles which can be obtained by emulsion polymerization and in which the solubility of the blowing agent is at least twice as high as in the adjoining phases.
  • thermoplastic particle foams we have accordingly found the above-described thermoplastic particle foams.
  • thermoplastic particle foams preferably have cells having a mean cell size in the range from 50 to 250 ⁇ m and a nanocellular structure or a fibrously elongated, disperse phase structure in the cell walls of the thermoplastic particle foams having a mean pore or fiber diameter in the range from 10 to 1000 nm, particularly preferably in the range from 100 to 500 nm.
  • FIG. 1 shows a section through the cells of a thermoplastic particle foam according to the invention.
  • FIG. 2 shows a section magnified by 10 ⁇ of the cell structure having a nanocellular cell wall shown in FIG. 1 .
  • the polymer matrix of the thermoplastic particle foams preferably comprises a continuous phase which is rich in styrene polymer and a disperse polyolefin-rich phase.
  • thermoplastic particle foams particularly preferably comprise a polymer matrix comprising
  • thermoplastic particle foams of the invention can be obtained by a process which comprises
  • the polymer mixture can in step b), firstly be pelletized and the pellets can subsequently be after-impregnated with a blowing agent in an aqueous phase under superatmospheric pressure at elevated temperature to produce expandable thermoplastic polymer particles. These can subsequently be isolated after cooling to below the melting point of the polymer matrix or can be obtained directly as prefoamed polymer particles (step c) by depressurization.
  • the polymer mixture having a continuous phase and a disperse phase can be produced by mixing two incompatible thermoplastic polymers, for example in an extruder.
  • the polymer mixture preferably comprises from 45 to 98.9% by weight, particularly preferably from 55 to 89.9% by weight, of a thermoplastic polymer A), in particular a styrene polymer such as general purpose polystyrene (GPPS) or high-impact polystyrene (HIPS) or a styrene-acrylonitrile copolymer (SAN) or acrylonitrile-butadiene-styrene copolymer (ABS).
  • GPPS general purpose polystyrene
  • HIPS high-impact polystyrene
  • SAN styrene-acrylonitrile copolymer
  • ABS acrylonitrile-butadiene-styrene copolymer
  • the polymer mixture preferably comprises from 1 to 45 percent by weight, in particular from 4 to 37% by weight; of a likewise thermoplastic polymer B) which is incompatible with the thermoplastic polymer A).
  • a polyolefin e.g. homopolymers or copolymers of ethylene and/or propylene, in particular polyethylene, especially when a styrene polymer is used as polymer A).
  • polypropylenes it is possible to use, in particular, injection-molding grades such as Adstif® RA 748 T or impact-modified grades such as Clyrell® EM 2484 from Basell.
  • polyethylenes it is possible to use commercially available ethylene homopolymers such as LDPE (injection-molding grades), LLDPE and HDPE or copolymers of ethylene and propylene (e.g. Moplen® RP220 and Moplen® RP320 from Basell), ethylene and oktene (Engage®) or ethylene and vinyl acetate (EVA), polyethylene acrylates (EA) such as Surlyn® grades 1901 and 2601 from DuPont or ethylene-butylene acrylates (EBA) such as Lucofin® 1400 HN, 1400 HM from Lucobit AG.
  • LDPE injection-molding grades
  • Moplen® RP220 and Moplen® RP320 from Basell
  • Engage® ethylene and oktene
  • EVA ethylene and vinyl acetate
  • EA polyethylene acrylates
  • the melt volume index MVI (190° C./2.16 kg) of the polyethylenes is usually in the range from 0.5 to 40 g/10 min and the density is in the range from 0.86 to 0.97 g/cm 3 , preferably in the range from 0.91 to 0.95 g/cm 3 .
  • PIB polyisobutene
  • compatibilizers component C
  • component C compatibilizers
  • the compatibilizer leads to improved adhesion between the polyolefin-rich phase and the polystyrene-rich phase and even in small amounts significantly improves the elasticity of the foam compared to conventional EPS foams.
  • Studies on the domain size of the polyolefin-rich phase showed that the compatibilizer stabilizes small droplets by reducing the interfacial tension.
  • An electron micrograph of a section through an expandable polystyrene/polyethylene comprising blowing agent shows disperse polyethylene domains in the polystyrene matrix.
  • Suitable compatibilizers are, for example, hydrogenated or unhydrogenated styrene-butadiene or styrene-isoprene block copolymers.
  • the total diene content is preferably in the range from 20 to 60% by weight, particularly preferably in the range from 30 to 50% by weight, and the total styrene content is accordingly preferably in the range from 40 to 80% by weight, particularly preferably in the range from 50 to 70% by weight.
  • Suitable styrene-butadiene block copolymers comprising at least two polystyrene blocks S and at least one styrene-butadiene copolymer block S/B are, for example, star-shaped branched block copolymers as are described in EP-A 0654488.
  • Further suitable compatibilizers are block copolymers having at least two hard blocks S 1 and S 2 comprising vinylaromatic monomers together with at least one random soft block B/S comprising vinylaromatic monomers and diene located between them, with the proportion of the hard blocks being above 40% by weight, based on the total block copolymer, and the 1,2-vinyl content of the soft block B/S being below 20%, as are described in WO 00/58380.
  • Linear styrene-butadiene block copolymers of the general structure S-(S/B)-S which have one or more blocks (S/B) random having a random styrene/butadiene distribution located between the two S blocks are also suitable as compatibilizers.
  • Such block copolymers can be obtained by anionic polymerization in a nonpolar solvent with addition of a polar cosolvent or a potassium salt, as described, for example, in WO 95/35335 or WO 97/40079.
  • the vinyl content is the relative proportion of 1,2 linkages of the diene units, based on the sum of the 1,2,1,4-cis and 1,4-trans linkages.
  • the 1,2-vinyl content of the styrene-butadiene copolymer block (S/B) is preferably below 20%, in particular in the range from 10 to 18%, particularly preferably in the range from 12 to 16%.
  • SBS styrene-butadiene-styrene
  • SBS styrene-butadiene-styrene
  • additives nucleating agents, plasticizers; flame retardants, soluble and insoluble inorganic and/or organic dyes and pigments, fillers or coblowing agents can be added to the multiphase polymer mixture in amounts which do not impair domain formation and the foam structure resulting therefrom.
  • nucleus formers or nucleating agents it is possible to additionally add, for example, polyolefin waxes or talc in amounts of from 0 to 5% by weight, preferably from 0.5 to 3% by weight, based on the polymers A) to C).
  • blowing agent (component D) in step b) preference is given to using from 1 to 15 percent by weight, preferably from 3 to 10 percent by weight, based on the polymer mixture of A) to C), of a physical blowing agent such as C 3 -C 8 -hydrocarbons, alcohols, ketones, ethers or halogenated hydrocarbons. Preference is given to using isobutane, n-butane, isopentane, n-pentane or isohexane.
  • Suitable coblowing agents are ones having a lower selectivity of the solubility in the phase forming the domains, for example gases such as CO 2 , N 2 , fluorinated hydrocarbons or noble gases. These are preferably used in amounts of from 0 to 10% by weight, based on the polymer mixture.
  • thermoplastic polymer A) which forms the continuous phase for example polystyrene
  • a polymer B) which forms the disperse phase and, if appropriate, compatibilizer C) to produce the polymer mixture in step a) and the polymer melt is subsequently conveyed through one or more static and/or dynamic mixing elements and impregnated with the blowing agent in step b).
  • the melt laden with blowing agent can subsequently be extruded through an appropriate die and cut to give foam boards, extrudates or particles.
  • the melt coming out of the die can also be cut directly by means of underwater pelletization (UWP) to give expandable polymer particles or polymer particles which have been partially foamed to a chosen extent.
  • UWP underwater pelletization
  • the underwater pelletization is generally carried out at pressures in the range from 1.5 to 10 bar.
  • the die plate generally has a plurality of nests having a plurality of holes.
  • expandable polymer particles having the preferred average particle diameters in the range from 0.5 to 1.5 mm. 0.8 mm are obtained.
  • Expandable polymer particles having a narrow particle size distribution and an average particle diameter in the range from 0.6 to 0.8 mm lead to better filling of automatic molding machines when the moldings have a finely structured shape. Furthermore, a better molding surface having a lower volume of interstices is achieved.
  • the round or oval particles obtained are preferably foamed to a diameter in the range from 0.2 to 10 mm.
  • Their bulk density is preferably in the range from 10 to 100 g/l.
  • the mean diameter of the disperse phase of the polymer mixture produced in step a) is preferably in the range from 1 to 2000 nm, particularly preferably in the range from 100 to 1500 nm.
  • a preferred polymer mixture in step a) is produced by mixing
  • the invention also provides the expandable, thermoplastic polymer particles which can be obtained as intermediate products in step b) and comprise a polymer matrix comprising
  • the finished expandable thermoplastic polymer particles can be coated with glycerol esters, antistatics or anticaking agents.
  • the fusion of the prefoamed foam beads to produce the molding and the mechanical properties resulting therefrom are improved, in particular, by coating the expandable thermoplastic polymer particles with a glyceryl stearate.
  • a coating comprising from 50 to 100% by weight of glyceryl tristearate (GTS), from 0 to 50% by weight of glyceryl monostearate (GMS) and from 0 to 20% by weight of silica.
  • the expandable, thermoplastic polymer particles of the invention can be prefoamed by means of hot air or steam to produce foam particles having a density in the range from 8 to 200 kg/m 3 , preferably in the range from 10 to 50 kg/m 3 , and subsequently fused in a closed mold to produce foam moldings.
  • Component A polystyrene PS 158K from BASF SE
  • Component B polyethylene
  • Component D blowing agent: pentane S (20% of isopentane, 80% of n-pentane)
  • Nucleating agent talc (HP 320, Omyacarb)
  • LLDPE LLDPE
  • PS 158K polystyrene
  • SBS block copolymer SBS block copolymer
  • talc HP 320, Omyacarb
  • polystyrene PS 158 K 2.2% by weight of talc (HP 320, Omyacarb), based on the polymer matrix, were added as nucleating agent in the form of a masterbatch with 2.2% by weight of polystyrene PS 158 K to the main melt stream laden with blowing agent via a side extruder.
  • the melt was extruded through a heated perforated plate (4 holes having a diameter of 0.65 mm and a perforated plate temperature of 280° C.).
  • the pellets comprising blowing agent were prefoamed to give foam beads having a low density (15-25 g/l) in an EPS prefoamer and processed at a gauge pressure of 0.7-1.1 bar in an automatic EPS molding machine to produce moldings.
  • Expandable thermoplastic mixtures having the composition in parts by weight indicated in Table 1 were produced in a manner analogous to Example 1. The density and cell count of the foam particles after prefoaming are reported in Table 2.
  • the blowing agent content of the minipellets was determined immediately after production and after storage for 7 days on filter paper at room temperature and atmospheric pressure by means of GC analysis.
  • the compression set ⁇ res is the percentage by which the height of the deformed body has decreased from the original height after 75% deformation.
  • significant elasticization compared to pure EPS is observed, as can be seen from the very high recovery after compression.
  • the transmission electron micrograph shows the cell structure ( FIG. 1 ) with nanocellular cell walls and struts ( FIG. 2 ) which contribute to the elasticization.
  • the pores have a size in the order of from 200 to 500 nm and correspond to the PE domains of the minipellets laden with blowing agent.
  • Example 1 Composition of the expandable thermoplastic mixtures (parts by weight) C
  • Example 2 Example 3 PS 158K 97.8 71.8 59.8 46.8 PE 22 33 44 3G55 4 6 8 Talc 2.2 2.2 2.2 2.2 Blowing agent content 6.8 6.5 6.5 8.2 (s-pentane) Blowing agent content 5.7 4.8 4 3 (s-pentane) after 7 days
  • Example 1 To improve the fusion of the foam particles, 0.3% by weight of a coating agent was applied to the surface of the pellets comprising blowing agent from Example 1 in a Lödige mixer. After a storage time of 4 hours, the coated pellets comprising blowing agent were prefoamed and fused to form moldings as in Example 1.
  • glyceryl tristearate As coating components, glyceryl tristearate (GTS) was used for Example 4 and a mixture of 60% by weight of GTS, 30% by weight of glyceryl monostearate (GMS) and 10% by weight of silica was used for Example 5.
  • the coating agent had a positive effect on the fusion of the prefoamed foam beads to produce the molding.
  • the flexural strength of the moldings obtained in Examples 4 and 5 could be increased to 220 and 227 kPa, respectively, compared to 150 kPa for the moldings obtained from the uncoated pellets in Example 1.
  • the components A to C were melted at 220-240° C./130 bar in a ZSK 18 twin-screw extruder from Leitritz. 8 parts by weight of pentane S (20% of isopentane, 80% of n-pentane) were subsequently injected as blowing agent into the polymer melt and incorporated homogenously into the polymer melt by means of two static mixers. The temperature was subsequently reduced to 180°-185° C. via a cooler. 2.2 parts by weight of talc (HP 320, Omyacarb) as nucleating agent were metered in the form of a 50% strength by weight polystyrene masterbatch through a side extruder into the main melt stream laden with blowing agent.
  • the melt was extruded at 4 kg/h through a heated perforated plate (4 holes having a diameter of 0.65 mm and a perforated plate temperature of 280° C.).
  • the proportions by weight of the components A to C are shown in table 4.
  • a ZE 40 twin-screw extruder from Leitritz, the components A to C were melted at 240-260° C./140 bar and admixed with 2.2 parts by weight of talc (HP 320, Omyacarb) as nucleating agent. 8 parts by weight of pentane S (20% of isopentane, 80% of n-pentane) were subsequently injected as blowing agent into the polymer melt and incorporated homogenously into the polymer melt by means of two static mixers. The temperature was subsequently reduced to 180°-195° C. via a cooler.
  • the polymer melt was pressed at 50 kg/h and 200-220 bar through a perforated plate maintained at 240-260° C. (hole diameter of 0.6 mm with 7 nests ⁇ 7 holes or hole diameter of 0.4 mm with 7 nests ⁇ 10 holes).
  • the proportions by weight of the components A to C are shown in table 4.
  • the pellets comprising blowing agent were prefoamed to foam beads having a low density (15-25 g/l prefoamed) in an EPS prefoamer and processed at a gauge pressure of 0.7-1.1 bar in an automatic EPS molding machine to produce moldings.
  • the compression set ⁇ res is the percentage by which the height of the deformed body has decreased from the original height after 75% deformation.
  • significant elasticization compared to pure EPS is observed, as can be seen from the very high recovery after compression.
  • the transmission electron micrograph shows the disperse distribution of the polyethylene in the minipellets comprising blowing agent, which contributes to elasticization of the foam after foaming.
  • the PE domains of the minipellets laden with blowing agent have a size in the order of from 200 to 1000 nm.
  • glyceryl tristearate GTS
  • GMS glyceryl monostearate
  • the small particle sizes of 0.8 mm showed an improvement in the processability to produce the molding in respect of demolding times and filling performance of the tool.
  • the surface of the molding became more homogenous than in the case of particles having a diameter of 1.1 mm.

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  • Chemical & Material Sciences (AREA)
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  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
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US12/595,275 2007-04-11 2008-04-08 Elastic particle foam based on polyolefin/styrene polymer mixtures Abandoned US20100143697A1 (en)

Applications Claiming Priority (3)

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EP07105953.9 2007-04-11
EP07105953 2007-04-11
PCT/EP2008/002774 WO2008125250A1 (de) 2007-04-11 2008-04-08 Elastischer partikelschaumstoff auf basis von polyolefin/styrolpolymer-mischungen

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Cited By (6)

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US8729143B2 (en) 2008-12-30 2014-05-20 Basf Se Elastic particle foam based on polyolefin/styrene polymer mixtures
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