Abstract:
Producing expandable polylactic acid-containing granules, comprises: (a) melting and mixing (i) polylactic acid, (ii) at least one additional polymer, (iii) a diepoxide or polyepoxide and (iv) at least one additive, preferably nucleating agent; (b) mixing (v) an organic blowing agent and (vi) a co-blowing agent including nitrogen, carbon dioxide, argon and/or helium, into the polymer melt via a static or dynamic mixer; (c) discharging the mixture via a nozzle plate with holes; and (d) granulating the blowing agent-containing melt directly behind the nozzle plate under water. Producing expandable polylactic acid-containing granules, comprises: (a) melting and mixing (i) polylactic acid (50-99.9 wt.%, based on the total weight of the components (i)-(iii)), (ii) at least one additional polymer (0-49.9 wt.%, based on the total weight of the components (i)-(iii)), (iii) a diepoxide or polyepoxide (0.1-2 wt.%, based on the total weight of the components (i)-(iii)) and (iv) at least one additive, preferably nucleating agent (0-10 wt.%, based on the total weight of the components (i)-(iii)); (b) mixing (v) an organic blowing agent (3-7 wt.%, preferably 1-7 wt.%, based on the total weight of the components (i)-(iv)) and (vi) a co-blowing agent including nitrogen, carbon dioxide, argon and/or helium (0.01-5 wt.%), into the polymer melt via a static or dynamic mixer at a temperature of at least 140[deg] C; (c) discharging the mixture via a nozzle plate with holes, whose diameter at the nozzle outlet is not > 1.5 mm; and (d) granulating the blowing agent-containing melt directly behind the nozzle plate under water at a pressure of 1-20 bar. Independent claims are also included for: (1) the expandable polylactic acid-containing granules with cavities with an average diameter of 0.1-50 mu m and a solid proportion of 93-97 wt.% obtained by the above method, comprising (in wt.%) (i) the polylactic acid (50-98.9, based on the total weight of components (i)-(iii)), (ii) at least one polyester based on aliphatic and aromatic dicarboxylic acids and aliphatic dihydroxy compounds (1-49.9, based on the total weight of components (i)-(iii)), (iii) an epoxide group-containing copolymer based on styrene, acrylic acid ester and/or methacrylic acid ester (0.1-2, based on the total weight of components (i)-(iii)), (iv) the additive (0-10, based on the total weight of components (i)-(iii)), and (v) the organic blowing agent (3-7), or a polylactic acid-containing polymer mixture; (2) producing particles of foam molded parts, comprising pre-foaming the expandable polylactic acid-containing granules with hot air or steam to form the foam particles with a density of 8-100 kg/m 3>, and then welding the foam particles in a closed mold; (3) the polylactic acid-containing polymer mixture comprising (in wt.%) (i) the polylactic acid (60-98.9, based on the total weight of components (i)-(iii)), (ii) at least one polyester (1-39.9, based on the total weight of components (i)-(iii)), based on (a) succinic acid (90-99.5 mol.%, based on the components (i)-(ii)), (b) at least one dicarboxylic acids with 8-20 carbon atoms (0.5-10 mol.%, based on the components (i)-(ii)), (c) 1,3-propanediol or 1,4-butanediol (98-102 mol.%, based on the components (i)-(ii)), (iii) the epoxide group-containing copolymer (0.1-2, based on the total weight of the components (i)-(iii)), and (iv) the nucleating agent (0-1, based on the total weight of components (i)-(iii)); and (4) foam materials comprising the polylactic acid-containing polymer mixture.
Abstract:
The invention relates to the use of a phosphorous compound of formula (I) as a flame retardant, wherein the symbols of formula (I) have the following meanings: a group Y is -P(=X 2 ) S R 3 R 4 , H, a straight-chain or branched C 1 -C 12 alkyl group , C 5 -C 6 cycloalkyl , C 6 -C 12 aryl, benzyl, wherein the four last cited groups are unsubstituted or substituted by one or more radicals from the group C 1 -C 4 alkyl or C 2 -C 4 alkenylene; R 1 , R 2 , R 3 and R 4 are the same or different hydrogen, OH, C 1 -C 16 -Alkyl, C 2 - C 16 -Alkenyl, C 1 -C 16 -Alkoxy, C 2 -C 16 -Alkenoxy, C 3 -C 10 -Cycloalkyl, C 3 -C 10 -Cycloalkoxy, C 6 -C 10 -Aryl, C 6 -C 10 -Aryloxy, C 6 -C 10 -Aryl-C 1 - C 16 -Alkyl, C 6 -C 10 -Aryl-C 1 -C 16 -Alkoxy, SR 9 COR 10 , COOR 11 , CONR 12 R 13 or two radicals R 1 , R 2 , R 3 , R 4 form a ring system together with the phosphorous atom to which they are bound or the group P-O-A-O-P; R 5 , R 6 , R 7 , and R 8 are the same or different H, C 1 -C 16 -Alkyl, C 2 -C 16 -Alkenyl, C 1 -C 16 -Alkoxy, C 2 -C 16 -Alkenoxy; R 9 , R 10 , R 11 , R 12 , and R 13 are the same or different H d-de-Alkyl, C 2 -C 16 - Alkenyl, C 6 -C 10 -Aryl, C 6 -C 10 -Aryl-C 1 -C 16 -Alkyl,, C 6 -C 10 - Aryl-C 1 -C 16 -Alkoxy; X 1 , and X 2 are the same or different S or O; r, and s are the same or different 0 or 1; and X 3 , X 4 , X 5 , and X 6 are the same or different S or O and n is a whole number from 1 to 50.
Abstract:
Moulded foams, obtainable by fusion of prefoamed foam beads made of expandable, thermoplastic polymer pellets, comprising: from 5 to 100% by weight of a component (A) comprising a1) from 5 to 100% by weight (based on (A)) of an α-methylstyrene/acrylonitrile copolymer and/or α-methylstyrene/styrene/acrylonitrile terpolymer and a2) from 0 to 95% by weight (based on (A)) of a styrene/acrylonitrile copolymer; from 0 to 95% by weight of polystyrene (B) and from 0 to 95% by weight of a thermoplastic polymer (C) different from (A) and (B), feature good heat resistance and good solvent resistance.
Abstract:
The invention relates to halogen-free, flame-proof polymer foams containing at least one cyclic or alicyclic oligophosphorus compound as the flame proofing agent, and to a method for the production thereof. Suitable oligophosphorus compounds, for example, are those having structures Ia, Ib, or Ic: Another group of suitable oligophosphorus compounds has one of the following structures IIa, IIb, or IIc: Furthermore, cyclic oligophosphorus compounds of the following structure III are suitable: The radicals R 1 -R 5 are independently selected from among the group consisting of C 1 -C 16 -alkyl, C 1 -C 16 -alkenyl, C 1 -C 16 -alkoxy, C 1 -C 16 -alkenyloxy, C 3 -C 10 -cycloalkyl, C 3 -C 10 -cycloalkoxy, C 6 -C 10 -aryl, C 6 -C 10 -aryloxy, C 6 -C 10 -aryl-C 1 -C 16 -alkyl, C 6 -C 10 -aryl-C 1 -C 16 -alkoxy, NR 2 R 3 , COR 2 , COOR 2 and CONR 2 R 3 , and the radicals X 1 , X 2 and X 3 independently denote O or S.
Abstract:
The invention relates to a closed-cell extruded foam that can be produced (a) by at least one styrene-acrylonitrile copolymer (SAN), and optionally at least one thermoplastic polymer from the group consisting of styrene copolymers, polyolefins, polyacrylates, polycarbonates (PC), polyesters, polyamides, polyether sulfones (PES), polyether ketones (PEK) and polyether sulfides, in order to form a polymer melt, (b) introducing between 1 and 12 wt. % (in relation to P) of a foaming constituent (T) containing less than 0.2 wt. % of water (in relation to P) and b1) between 15 and 95 wt. % (in relation to T) of carbon dioxide and b2) between 5 and 85 wt. % (in relation to T) of at least one co-foaming agent selected from the group consisting of C 1 -C 4 alcohols and C 1 -C 4 carbonyl compounds, into the polymer melts in order to form an expandable melt, (c) extruding the expandable melt in a region of lower pressure while expanding to form the extruded foam, and (d) optionally adding additives to form the polymer components (P) in at least one of the steps a), b) and/or c).
Abstract:
The present invention relates to an expandable styrene polymer, comprising at least one flame retardant as component (A), 0.0001 to 2 wt.%, in relation to component (A), of at least one metal as component (B), and athermanous particles as component (C), to a method for the production of said expandable styrene polymer, to an expanded styrene polymer particle, comprising at least one flame retardant as component (A), 0.0001 to 2 wt.%, in relation to component (A), of at least one metal as component (B), and athermanous particles as component (C), to a method for the production of said expanded styrene polymer particle, to a foam that can be produced from said expandable styrene polymer, to a method for the production of said foam, and to the use of said foam for heat insulation, for the thermal insulation of machines and household appliances, and as a packaging material.