Abstract: The present invention relates to a method of improving UV resistance of a vinylaro-maticmolding mass by means of compounding a thermoplastic polymer composition which comprises at least one graft copolymer with an organopolysiloxane compound and optionally further components.

Abstract: Thermoplastic elastomer compositions can be use for medical applications, Comprising: a) 97.1 to 90.9 wt.-% star-shaped block copolymer A with identical arms of the structure [S1-(S/B)k-(S/B)I-(S/B)m-S2]n-X, where S1 and S2 are vinylaromatic hard polymer and S/B are soft random vinylaromatic/diene copolymer blocks; X is a coupling center; and b) 2.9 to 9.1 wt.-% plasticizer B.

Abstract: Polymer compositions comprising stiff and tough star shaped styrene butadiene block-copolymers A1 and A2 can be used for making shrink films. Block copolymer A2 preferably has the structure with hard blocks Se and Si, hard random copolymer blocks (B/S)Ae, soft random copolymer blocks (B/S)B coupled by a coupling agent X.

Abstract: A process for the production of a graft copolymer composition is presented, which is based on acrylonitrile-styrene-acrylate (ASA) or acrylonitrile-butadiene-styrene (ABS) graft copolymers. The graft copolymers obtained by emulsion polymerization and precipitation show improved dewatering behavior after precipitation. Based on this method ASA and ABS graft copolymers with low residual humidity can be obtained. Furthermore, the invention relates to a process for the production of a thermoplastic molding composition comprising at least one thermoplastic styrene copolymer, in particular a styrene-acrylonitrile copolymer, the graft copolymer obtained by the process, and optional further components.

Abstract: The present invention is directed to a process for the production of graft copolymer compositions which are based on acrylonitrile-styrene-acrylate (ASA) or acrylonitrile-butadiene-styrene (ABS) graft copolymers. The graft copolymers compositions are obtained by emulsion polymerization and afterwards precipitation, dewatering, drying and optionally cooling of the dried graft copolymer powder, wherein the graft copolymer B powder obtained is mixed with an aeration gas, preferably air and/or nitrogen, wherein the bulk density of the graft copolymer B powder is equal or less than 98.5% of the bulk density of the non-aerated graft copolymer B, during the whole aeration step. The graft copolymer powders show higher powder flowability and less tendency of caking during storage, for example in a silo.

Abstract: The present invention relates to a process for producing a thermoplastic molding composition and articles made thereof having improved surface quality, in particular improved surface quality after exposure to warm-humid environmental conditions. The thermoplastic molding composition comprises a thermoplastic polymer A, a graft copolymer B obtained by emulsion graft polymerization and optionally a further polymer component P, as well as optional further components/additives K, wherein at least one crystallization additive C, selected from phosphate compounds having 1 to 25 phosphate units, organic acids and salts thereof, is added during or after the preparation of the graft copolymer B.

Abstract: Thermoplastic polymer compositions (P) comprising at least one styrene-based polymer composition (A) comprising at least one graft copolymer (A-1), at least one organopolysiloxane compound, and optionally at least one colorant, dye or pigment, and/or at least one further additive, shows improved properties with respect to residual gloss after abrasion combined with improved melt flow characteristics while heat resistance is not affected.

Abstract: The invention relates to a polymer composition (P), comprising at least one acrylonitrile-butadiene-styrene copolymer (A) (ABS copolymer (A)), characterized in that the polymer composition (P) has a surface energy of >38 dyne/cm. The invention further relates to a process for painting a surface of a polymer moulded article comprising the polymer composition (P), wherein no pre-treatment of the surface of the polymer moulded article, such as primer coating, is required prior to the application of the paint.

Abstract: High heat resistant ABS molding compositions for use in the automotive sector, electronics, and household or healthcare sector comprising: (A) 15 to 35 wt.-% ABS graft copolymer (A); (B) 15 to 35 wt.-% a-methylstyrene/acrylonitrile copolymer (B) (weight ratio 95:5 to 50:50); (C) 20 to 40 wt.-% styrene/acrylonitrile copolymer (C) (weight ratio 95:5 to 50:50; Mw 150,000 to 300,000); (D) 10 to 30 wt.-% random terpolymer (D) made from 13 to 27 wt.-% ?, ? ethylenically unsaturated cyclic anhydride, 60 to 74 wt.-% aromatic vinyl monomer, and 13 to 27 wt.-% maleimide monomer); (E) 0.1 to 5 wt.-%, of at least one elastomeric block copolymer (E) comprising a vinylaromatic monomer block S and an elastomeric random diene/vinylaromatic onomer block B/S; hard phase proportion is 1 to 40 vol.-% and the diene proportion is less than 50 wt.-%; and (F) 0 to 5 wt.-% of further additives and/or processing aids (F).

Abstract: A method for producing a polymer from a first component and a second component using a reactor (50) offers technical advantages, wherein reaction heat produced in the reactor (50) is discharged via a boiling cooler (40) by supplying gaseous vapors produced in the reactor (50) to the boiling cooler (40). A product flow containing condensed vapors is returned to the reactor (50) from the boiling cooler (40) via a separation vessel (60), and an aqueous phase is separated from the product flow in the separation vessel (60). A system is provided for producing a polymer from a first component and a second component, comprising a reactor (50) and a boiling cooler (40) for discharging reaction heat produced in the reactor (50). A separation vessel (60) is arranged between the boiling cooler (40) and the reactor (50) such that a product flow containing condensed vapors is returned to the reactor (50) from the boiling cooler (40) via the separation vessel (60).

Abstract: The invention relates to polymer blends of a styrene copolymer A selected from the group consisting of styrene acrylonitrile copolymers (SAN), styrene acrylonitrile maleic anhydride terpolymers (SMA), styrene acrylic copolymers, acrylonitrile butadiene styrene terpolymers (ABS), acrylonitrile butadiene styrene terpolymers with polyamide (ABS/PA), and acrylonitrile styrene acrylate terpolymers (ASA); and at least one copolymer B selected from the group consisting of styrene-butadiene block copolymers (SBC) and styrene-isoprene block copolymers (SIS); wherein the mold shrinkage of the polymer blend is reduced by at least 5% compared to the mold shrinkage of the pure styrene copolymer A.A process for the preparation of the polymer blends and the uses of the polymer blends in an injection molding process are described.

Abstract: Thermoplastic resin composition comprising: (a1) at least one styrene-acrylonitrile copolymer component A1, (a2) at least one acrylonitrile styrene acrylate graft copolymer A2 as impact modifier, (a3) optionally at least one thermoplastic polymer A3 other than components A1 and A2, (b) at least one pigment B, (c) at least one hindered amine UV light stabilizer C, and (d) optionally further polymer additives D, other than components B and C, wherein the UV stabilizing component(s) present in the thermoplastic resin are only hindered amine UV light stabilizer(s) C.

Abstract: Thermoplastic styrene copolymer resin composition comprising: (a1) at least one styrene-acrylonitrile copolymer component A1, (a2) at least one acrylonitrile styrene acrylate graft copolymer A2 as impact modifier, (a3) optionally at least one thermoplastic polymer A3 other than components A1 and A2, (b) at least one transition metal oxide pigment B, (cl) at least one hindered amine UV light stabilizer C1, (c2) optionally at least one UV absorber C2 different from Cl, (d) optionally further polymer additives D, other than components B, C1, C2, and E, and (e) optionally one metal scavenger component E, wherein at least 99.0 wt.-% of the transition metal oxide pigment B consist of transition metal atoms and oxygen atoms.

Abstract: A method for producing a polymer from a first component and a second component using a reactor (50) offers technical advantages, wherein reaction heat produced in the reactor (50) is discharged via a boiling cooler (40) by supplying gaseous vapors produced in the reactor (50) to the boiling cooler (40). A product flow containing condensed vapors is returned to the reactor (50) from the boiling cooler (40) via a separation vessel (60), and an aqueous phase is separated from the product flow in the separation vessel (60). A system is provided for producing a polymer from a first component and a second component, comprising a reactor (50) and a boiling cooler (40) for discharging reaction heat produced in the reactor (50). A separation vessel (60) is arranged between the boiling cooler (40) and the reactor (50) such that a product flow containing condensed vapors is returned to the reactor (50) from the boiling cooler (40) via the separation vessel (60).

Abstract: The invention relates to a process for producing graft copolymers based on acrylonitrile-butadiene-styrene copolymers (ABS), wherein the graft copolymers may be dewatered particularly readily after production and precipitation and have a low residual moisture content after centrifugation. The invention further relates to a process for producing thermoplastic molding materials using the thus obtained ABS graft copolymers.

Abstract: ABS molding composition comprising: (a) 50 to 80 wt.-% SAN copolymer (a) (S/AN ratio 78:22 to 65:35, Mw 80,000 to 250,000); (b) 8 to 25 wt.-% graft copolymer (b) consisting of 15 to 60 wt.-% graft sheath (b2) and 40 to 85 wt.-% graft substrate—an agglomerated butadiene rubber latex—(b1), obtained by emulsion polymerization of SAN in presence of agglomerated butadiene rubber latex (b1) (D50 150 to 800 nm); and (c) 8 to 30 wt.-% SBC block copolymer (vinylarene 58 to 68 wt.-%) comprising diene/vinylarene tapered polymer blocks; exhibiting ultra-high flow melt with good mechanical properties, a process for their preparation and their use for the production of bulky and/or thin walled articles.

Abstract: Thermoplastic molding composition comprising (A) 40 to 80 wt.-% SAN copolymer (S/AN-ratio 78:22 to 65:35, Mw 80,000 to 250,000 g/mol); (B) 20 to 60 wt.-% SBC block copolymer (monovinylarene 61 to 64 wt.-%) comprising conjugated diene/monovinylarene tapered polymer blocks; and (C) 0 to 5 wt.-% additives and/or processing aids (C); exhibiting ultra-high melt flow with good mechanical, thermal and optical properties, a process for its preparation and its use for the production of bulky and/or thin walled articles.

Abstract: The present invention relates to a process for producing a thermoplastic moulding composition comprising a thermoplastic copolymer A, a graft copolymer B and optionally a further polymer component C as well as optional further additives K, wherein the preparation of the graft copolymer B is carried out via emulsion polymerization, and wherein at least one surfactant S2 is used in grafting step of emulsion polymerization in a volume concentration in the range of 0.46 to 0.75 mol/m3, based on the volume of the graft copolymer B latex particles obtained; and wherein the mean particle diameter Dw of the latex particles of graft copolymer B is in the range of 60 to 800 nm.

Abstract: The present invention relates to thermoplastic molding compounds F containing at least two graft rubbers P-I and P-II which are processed by the co-precipitation of a mixture of the respective emulsions containing P-I and P-II. The present invention further relates to a method for producing such thermoplastic molding compounds F and to molded bodies obtained from a thermoplastic molding compound F according to the invention.

Abstract: The invention relates to a vinyl aromatic/diene-block copolymer A, obtained by an anionic polymerization of a monomer composition, comprising: Al: 60-95 wt.-% of at least one vinyl aromatic monomer, and A2:5-40 wt.-% of at least one diene monomer, wherein the vinyl aromatic/diene-block copolymer A in total comprises less than 10 parts per million (ppm) of acetaldehyde, methacrolein and styrene based on the total amount of vinyl aromatic/diene-block copolymer A; the vinyl aromatic/diene-block copolymer A has improved orgnoleptic properties and is in particular suitable for producing food packaging materials.