Abstract:
A thermoplastic molding composition having reduced gloss sensitivity and no unpleasant odor is produced from a graft copolymer and a thermoplastic polymer. The graft copolymer is produced from a soft elastomeric particulate graft base obtained by emulsion polymerization of a conjugated diene alone or with a small amount of a mono- ethylenically unsaturated monomer, using an inorganic radical generating substance and a limited amount of chain transfer agent, upon which is grafted a vinyl aromatic monomer and acrylonitrile and optionally another monoethylenically unsaturated monomer using an inorganic radical generating substance while the use of a chain transfer agent is excluded. The thermoplastic polymer is a copolymer of a vinyl aromatic monomer and acrylonitrile and optionally an additional monoethylenically unsaturated monomer. The thermoplastic molding composition has a low level of unpleasant odor coupled with reduced gloss sensitivity and good mechanical properties.
Abstract:
Films or plates made of a plastic mixture and capable of being metal-plated are disclosed, comprising, in relation to the total weight of components A, B, C and D, which add up to 100 % by weight: (a) 5-50 % by weight of a thermoplastic polymer as component A; (b) 50-95 % by weight of a metal powder having an average particle diameter ranging from 0.01-100 µm (determined by the method defined in the description), the metal having a more negative normal potential in an acid solution than silver, as component B; (c) 0-10 % by weight of a dispersant as component C; and (d) 0-40 % by weight fibrous or particulate fillers or their mixtures as component D. The elongation at tear of component A (determined by the method defined in the description) is 1.1-100 times higher than the elongation at tear of the plastic mixture comprising components A, B and optionally C and D (determined by the method defined in the description). The tensile strength of component A (determined by the method defined in the description) is 0.5-4 times higher than the tensile strength of the plastic mixture comprising components A, B and optionally C and D (determined by the method defined in the description). Also disclosed are thermoplastic moulding compounds for producing these films or plates that can be metal-plated, a granulate comprising these thermoplastic moulding compounds, stratified composite films or plates and mouldings comprising these films or plates, metal-plated polymer bodies comprising these films or plates, stratified composite films or plates and mouldings, processes for producing these objects, the use of these objects as EMI shieldings and absorbers, dampers or reflectors for electromagnetic radiation, oxygen scavengers, electroconducting components, gas barriers, and decorative elements comprising these objects.
Abstract:
Disclosed is a method for producing a thermoplastic ABS molding compound. According to said method, the thermoplastic copolymer A is produced from acrylonitrile and styrene by means of bulk polymerization or solution polymerization, while graft copolymer B, which is composed of a graft base (B1) and a graft shell (B2), is produced by means of emulsion polymerization using a redox initiator system, whereupon the thermoplastic copolymer A, graft copolymer B, and additional optional components K and/or additional thermoplastic polymers (TP) are mixed.
Abstract:
The invention relates to a method for producing impact resistant plastics on the basis of grafted cross-linked rubber particles. The invention further relates to an impact resistant plastic that is obtained using the inventive method. The method for producing the impact resistant plastic comprises the following steps: (a) producing particles of a cross-linked rubber from a first monomer mixture that has a diene composition content of
Abstract:
The invention pertains to a styrene polymer foam produced from a styrene homo- or copolymer that is foamed by extrusion and optionally processed further and a foaming agent that consists essentially of carbon dioxide, and containing impact-resistant polystyrene.
Abstract:
Empleo de 10 hasta 200 ppm, con relación a la masa de moldeo F, de al menos un poliorganosiloxano S para reducir las modificaciones de la tonalidad de color indeseadas, provocadas por las bajas temperaturas (Cold Stress Whitening) en masas de moldeo termoplásticas, resilientes, F que presentan al menos un polímero de injerto A caucho-elástico y al menos un polímero B termoplástico, que presenta un valor dE mayor que 3, determinado según DIN 5033.
Abstract:
Procedimiento para la aglomeración de al menos un caucho dispersado en fase acuosa (A) mediante adición de una dispersión de al menos un polímero de aglomeración (B) en fase acuosa, caracterizado porque se emplea como B un polímero de aglomeración, que no contiene esencialmente grupos ácidos libres, y se lleva a cabo la aglomeración en presencia de al menos un electrólito básico, empleándose como electrólito básico un hidróxido orgánico o inorgánico.
Abstract:
Procedimiento para la obtención de partículas de caucho K que contienen, en forma polimerizada A) un 80 a un 100 % en peso, referido a K, de butadieno o isopreno, o sus mezclas (monómeros diénicos A), y B) un 0 a un 20 % en peso, referido a K, de uno o varios comonómeros con insaturación monoetilénica B, por medio de polimerización en emulsión en presencia de un emulsionante, o una mezcla de diversos emulsionantes, seleccionados a partir del grupo de sales metálicas alcalinas de ácidos alquil- o alquiarilsulfónico, alquilsulfatos, sulfonatos de alcohol graso, sales de ácidos grasos superiores con 10 a 30 átomos de carbono, sulfosuccinatos, étersulfonatos y etapas resínicas, y un iniciador de polimerización, caracterizado porque 1) se dispone una mezcla en M1, que contiene, referido a M1, M1a)un 20 a un 100 % en peso de agua, que es necesaria para la obtención de emulsión (agua de emulsión), y M1b)un 0, 1 a un 100 % en peso de emulsionante, 2) después se añade una mezcla M2, que contiene, referido a M2, M2a)un 90 a un 100 % en peso de uno o varios monómeros seleccionados a partir de estireno, - metilestireno, butadieno, acrilato de n-butilo, metacrilato de metilo y acrilonitrilo, y M2b)un 0 a un 10 % en peso de uno o varios monómeros copolimerizables.
Abstract:
The invention relates to a process for preparing an impact-modified plastic based on grafted crosslinked rubber particles, and also to an impact-modified plastic obtainable by the process. To prepare the impact-modified plastic, (a) particles of a crosslinked rubber are produced from a first monomer mixture which has a content of