Abstract:
Process for the preparation of very low haze and color stable styrenic polymers by anionic polymerization wherein the obtained terminated polymer solution is passed through a first filter, fed to a dispersing device to which water is added, fed to a buffer vessel and then is impregnated in a static mixer by addition of further water, carbon dioxide and one or more stabilizers.
Abstract:
The present invention relates to a polymer composition comprising at least one block copolymer and a specific amount of at least one oil component. The block copolymer, which is the polymeric matrix of the inventive composition, is built up from at least one vinyl aromatic monomer M A and at least one conjugated diene monomer M B , in particular the block copolymer is a styrene butadiene block copolymer (SBC).
Abstract:
Process for the preparation of styrenic polymers having an improved color stability by anionic polymerization wherein the obtained terminated polymer solution is fed to a dispersing device to which water is added, fed to a buffer vessel and then is impregnated in a static mixer by addition of further water, carbon dioxide and one or more stabilizers.
Abstract:
The invention relates to a vinyl aromatic/diene-block copolymer A, obtained by an anionic polymerization of a monomer composition, comprising: A1: 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.
Abstract:
A polymer composition comprises a polymer mixture (A) of linear vinylaromatic diene block copolymers (A1), (A2) and (A3) and optionally vinylaromatic diene copolymer (A4) and has improved organoleptic properties and reduces film blocking for extruded film applications. A process for its preparation, and the use of said polymer compositions for the production of films is described. The soft phase of mixture (A) built from diene has a proportion of 15 to 34 vol.-% and has a cylindrical morphology. The Mn of mixture (A) is at least 120,000 g/mol.
Abstract:
A thermoplastic polymer composition (I) comprising: (A) block copolymer A comprising A1: 60 to 95 wt.-% vinyl aromatic monomer, and A2: 5 to 40 wt.-% conjugated diene; (B) a stabilizer combination consisting of: B1: 200 to 2500 ppm 2,6-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazin-2- ylamino) phenol, B2: 500 to 2500 ppm 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di- tert-pentylphenyl acrylate and/or 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5- methylbenzyl)-4-methylphenyl acrylate, and B3: 500 to 2000 ppm tris(2,4-di-tert.-butylphenyl)phosphite; (C) 0 to 5000 ppm stabilizers different from (B1), (B2) and (B3); (D) optionally additives and/or processing aids other than (B) and (C), (E) optionally thermoplastic polymer TP other than block copolymer A, a process for its preparation, and its use for the preparation of shrink films is described.
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 A2preferably has the structure (formula) 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:
The invention proposes a linear vinylaromatic diene block copolymer (A) and polymer compositions comprising such SBC for the production of films having organoleptically improved, low film-blocking properties. Block copolymer (A) has sharp block transitions and a molecular weight Mn of at least 140,000 g/mol, wherein the proportion of a soft phase built from diene is from 15 to 35 vol.-%, and which soft phase - embedded in a vinylaromatic hard phase - has a cylindrical morphology.
Abstract:
The present invention relates to transparent and flexible styrene butadiene copolymer compositions having high softness and temperature resistance as well as good processability, and the process for their preparation. Further, the invention is directed to shaped articles produced from the inventive polymer composition, and the use of said polymer composition for preparing moldings, in particular for medical applications, in particular medical drip chambers.
Abstract:
The invention relates to an improved process for providing purified styrenic monomers, such as styrene, from styrene-containing polymer waste. Styrene-containing waste is depolymerized in a suitable reactor, and the depolymerization products are condensed and separated in a three-step distillation process.