Abstract:
A polymer mixture contains (P1) 0.1 to 99.9 % by weight of a rubber-elastic block copolymer made of at least one block S having polymerised units of a vinyl aromatic monomer and forming a hard phase and of at least one elastomer block B/S that contains both polymerised units of a vinyl aromatic monomer (S) and a diene (B) and forms a soft phase. The glass transition temperature Tg of block S is higher than 25 DEG C and that of block B/S is lower than 25 DEG C. The phase volume ratio between block S and block B/S is selected so that the hard phase forms 1 to 40 % by volume of the whole block copolymer and the diene forms less than 50 % by weight of the whole block copolymer. The polymer mixture also contains (P2) 0.1 to 99.9 % by weight of at least one thermoplastic or duroplastic polymer or mixtures of said polymers; and (P3) 0 to 70 % by weight of other additives and auxiliary substances. The percentages by weight of components (P1) to (P3) add up to 100 % by weight.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von funktionalisiertem isotaktischen Polystyrol, funktionalisiertes isotaktisches Polystyrol, herstellbar nach dem erfindungsgemäßen Verfahren, die Verwendung des erfindungsgemäßen funktionalisierten isotaktischen Polystyrols als Makromonomer, ein Verfahren zur Herstellung eines Makroinitiators, einen Makroinitiator herstellbar nach dem vorstehend genanten Verfahren, die Verwendung des Makroinitiators für die kontrollierte radikalische Polymerisation, die Verwendung des erfindungsgemäßen funktionalisierten isotaktischen Polystyrols als Makromonomer, bevorzugt in der Copolymerisation mit Olefinen, der ROMP mit Cycloolefinen oder zur Kupplung mit Silikonsegmenten, ein Verfahren zur Epoxidierung des erfindungsgemäßen funktionalisierten isotaktischen Polystyrols, epoxidiertes isotaktisches Polystyrol, herstellbar nach dem vorstehend genannten Verfahren sowie ein Verfahren zur Herstellung von weichen thermoplastischen Elastomeren (TPE) durch Metathesepolymerisation des erfindungsgemäßen funktionalisierten isotaktischen Polystyrols mit geeigneten Polymeren, die endständige Doppelbindungen aufweisen, und weiche thermoplastische Elastomere herstellbar nach dem erfindungsgemäßen Verfahren.
Abstract:
Eine Mischung, die a) 25 bis 75 Gew.-% eines Blockcopolymeren A, welches mindestens einen Hartblock S aus vinylaromatischen Monomeren und ein oder mehrere Weichblöcke BA aus jeweils 0 bis 5 Gew.-% vinylaromatischen Monomeren und 95 bis 100 Gew.-% Dienen aufweist, und wobei der Massenanteil der Hartblöcke S im Blockcopolymeren A 65 bis 90 Gew.-% ausmacht; b) 5 bis 25 Gew.-% eines Blockcopolymeren B, welches mindestens einen Hart- block S aus vinylaromatischen Monomeren und ein oder mehrere Copolymerblöcke (B/S)B aus jeweils 20 bis 60 Gew.-% vinylaromatischen Monomeren und 80 bis 40 Gew.-% Dienen aufweist, und wobei der Massenanteil der Hartblöcke S im Blockcopolymeren B 25 bis 70 Gew.-% ausmacht; c) 0 bis 70 Gew.-% eines von A und B verschiedenen Blockcopolymeren C oder Polystyrol und d) 0 bis 6 Gew.-% eines Plastifizierungsmittels D; enthält, wobei die Summe der Komponenten A) bis D) 100 Gew.-% ergibt, sowie Verwendung für transparente Tiefziehfolien oder transparente Spritzgussartikel.
Abstract:
Ein Verfahren zur Herstellung von Mischungen aus Blockcopolymeren S1-B-S2 und Styrolpolymeren, umfassend die Stufen: a) Herstellen einer lithium-terminierten Blockcopolymerlösung S1-B-Li durch sequentielle anionische Polymerisation, b) Stabilisierung der Lösung aus Stufe a) durch Zugabe eines Magnesium- oder Aluminiumorganyls, c) Zugabe von vinylaromatischen Monomeren und einem anionischen Polymerisationsinitiator, d) Zugabe eines Kettenabbruch- oder Kopplungsmittels und Isolierung der Mischung, wobei S1 für einen Block aus vinylaromatischen Monomeren und einem zahlenmittleren Molekulargewicht Mn im Bereich von 8.000 - 40.000 g/mol, S2 für eine Block aus vinylaromatischen Monomeren und einem zahlenmittleren Molekulargewicht Mn im Bereich von 50.000 - 250.000 g/mol und B für einen, gegebenenfalls aus mehreren Unterblöcken zusammengesetzten Block aus Dienen und/oder Dienen und vinylaromatischen Monomeren steht, nach diesem Verfahren erhältliche Mischungen.
Abstract:
Thermoplastic moulding compounds contain: (A) 30 to 98 wt % of a graft polymer which consists of (ak) 30 to 90 wt % of a cross-linked acrylic rubber graft nucleus; (as) 10 to 70 wt % of a graft shell made of (as/1) 50 to 100 wt % of a styrene compound, of an acrylic or methacrylic acid (C1-C8-alkyl)ester, or of a mixture of the styrene compound and the acrylic or methacrylic acid (C1-C8-alkyl)ester; and (as/2) 0 to 50 wt % of one or several other monomers; (B) 1 to 50 wt % of a thermoplastic polymer; and (C) 1 to 70 wt % of a rubber elastic block copolymer.
Abstract:
Thermoplastic elastomer moulding compounds based on a rubber elastic block copolymer are obtained by hydrogenating a styrene-butadiene block copolymer composed of at least one block A that forms a hard phase and contains polymerised styrene units and of at least one elastomer block (B/S) that forms a soft phase and contains polymerised styrene and butadiene units. The glass transition temperature Tg of block A of the styrene-butadiene block copolymer lies above 25 DEG C and that of its block (B/S) lies below 25 DEG C. The phase volume ratio between blocks A and B/S is selected so that the proportion of hard phase in the total block copolymer equals 1 to 40 vol % and the weight percentage of diene is lower than 50 wt %.
Abstract:
Rubber-elastic block copolymers of at least one hard block A consisting of styrene monomers and at least one elastomeric block (B/A) of styrene monomers and containing dienes, the glass temperature Tg of block A being over 25 DEG C and that of block B/A is under 25 DEG C and the phase volume ratio between block A and block B/A being such that the proportion of the hard phase in the entire block copolymer is 1 to 40 vol %, and the proportion by weight of the diene is under 50 wt.%. The relative proportion of 1,2 bonds of the polydiene in relation to the sum of 1,2 and 1,4 cis/trans-bonds is under 15 %, process for their production by anionic polymerisation by means of lithium alkyl in a non-polar solvent in the presence of a soluble potassium salt and their use for the production of mouldings.
Abstract:
Impact-resistant thermoplastic moulding compounds containing in relation to the mixture of A, B1 and B2, A: 40 to 94 wt.% of a hard matrix A made up of, in relation to the hard matrix A, 60 to 100 wt.% of units of one or more vinyl aromatic monomers and 0 to 40 wt.% of units of one or more polar comonomers; and B1: 1 to 30 wt.% of a particulate rubber B1 based on a possibly grafted and hydrogenated conjugated polydiene or a block copolymer of a diene and a vinyl aromat (b1) which includes (occludes) components of the hard matrix A, in that is has a capsule, cell or labyrinth particle morphology; B2: 5 to 30 wt.% of a particulate rubber B2 at least partially incompatible with rubber B1, based on a block copolymer b2 of a conjugated diene and a vinyl aromatic compound, possibly grafted with one or more vinyl aromatic monomers and possibly polar comonomers, in which the block copolymer b2 contains at least one block of statically distributed diene and a vinyl aromatic compound, and rubber B2 had a strip morphology; and their use for producing foils, plates or mouldings.
Abstract:
A medical moulded part, in particular a component of a transmission system for perfusion or transfusion purposes, is made of a mixture that contains (P1) 0.1 to 100 % by weight of a rubber-elastic block copolymer made of at least one block S that forms a hard phase and contains polymerised units of a vinyl aromatic monomer and of at least one block B/S that forms a soft phase and contains polymerised units of both a vinyl aromatic monomer (S) and a diene (B). The glass transition temperature Tg of block S is higher than 25 DEG C and that of block B/S is lower than 25 DEG C. The phase volume ratio between block S and block B/S is selected so that the hard phase represents 1 to 40 % by volume of the whole block copolymer and the diene less than 50 % by weight of the whole block copolymer. The mixture also contains (P2) 0 to 99.9 % by weight of a thermoplastic and/or duroplastic polymer; and (P3) 0 to 70 % by weight other additives and auxiliary substances. The sum of the percentages by weight of components P1 to P3 equals 100 %.
Abstract:
The invention concerns a foil, in particular for food packaging, said foil consisting of a polymer P1 or a mixture containing: P1: 0.1 to 100 wt %. of a rubber-elastic block copolymer P1 comprising at least one block S, which comprises vinylaromatic monomer units, incorporated by polymerization, and which forms a hard phase, and at least one elastomer block B/S, which comprises units, incorporated by polymerization, both of a vinylaromatic monomer (S) and of (B), and which forms a soft phase, the glass transition temperature Tg of the block S being more than 25 DEG C and that of the block B/S being less than 25 DEG C, and the phase-volume ratio of block S to block B/S being such that the hard phase portion in the total block copolymer is 1 to 40 vol % and the portion of the diene is less than 50 wt %; P2: 0 to 99.9 wt % of a thermoplastically formable and/or duroplastic polymer P2; P3: 0 to 70 wt % of further additives and forming auxiliary agents, the total of the weight percentages of constituents P1 to P3 being 100 %.