Abstract:
The invention relates to a polymer foam having a density in the range between 5 and 120 kg/m3, containing a) a polymer component, containing at least one styrene polymer, b) 0.1 to 5 parts by weight (relative to 100 parts by weight of component a)) of a flame retardant mixture, containing b1) at least one phosphorus compound of formula (I) having a phosphorus content in the range between 5 and 80% by weight, relative to the phosphorus compound, (X1)s =PR1R2R3 (I), where the symbols and indices in formula (I) have the following meanings: R1 is C1-C16-alkyl, C1-C10-hydroxyalkyl, C2-C16-alkenyl, C1-C16-alkoxy, C2-C16-alkenoxy, C3-C10-cycloalkyl, C3-C10-cycloalkoxy, C6-C10-aryl, C6-C10-aryloxy, C6-C10-aryl-C1-C16-alkyl, C6-C10-aryl-C1-C16-alkoxy, SR9, COR10, COOR11, CONR12R13; R2 is C1-C16-alkyl, C1-C10-hydroxyalkyl, C2-C16-alkenyl, C1-C16-alkoxy, C2-C16-alkenoxy, C3-C10-cycloalkyl, C3-C10-cycloalkoxy, C6-C10-aryl, C6-C10-aryl-C1-C16-alkyl,C6-C10-aryl-C1-C16-alkoxy, SR9, COR10, COOR11, CONR12R13;R3 is H, SH, SR4, OH, OR5 or a group 30 -(Y1)n-[P(= X2)uR6 -(Y2)n]m-P(= X3)tR7R8; or two groups R1, R2, R3 together with the phosphorus atom to which they are bound form a ring system; X1, X2 and X3 are independently of each other identically or differently O or S; Y1, Y2 are identically or differently O or S; R4, R5, R9, R10, R11, R12,R13 are identically or differently C1-C12-alkyl, C3-C8-cycloalkyl, which is unsubstituted or substituted by one or more C1-C4-alkyl groups, C2-C12-alkenyl, C2-C12-alkinyl, C6-C10-aryl or C6-C10-aryl C1-C4-alkyl; R6, R7, R8 are independently of each other identically or differently C1-C16-alkyl, C1-C16-alkenyl, C1-C16-alkoxy, C1-C16-alkenoxy, C3-C10-cycloalkyl, C3-C10-cycloalkoxy, C6-C10-aryl, C6-C10-aryloxy, C6-C10-aryl-C1-C16-alkyl, C6-C10-aryl-C1-C16-alkoxy, SR9, COR10, COOR11, CONR12R13; n is 1, if Y1 or Y2 is O, and 1, 2, 3, 4, 5, 6, 7 or 8, if Y1 or Y2 is S; m is a whole number between 0 and 100; s, t and u are independently of each other 0 or 1; and b2) elementary sulphur.
Abstract:
The invention relates to a method for the production of shaped foam bodies, comprising: provision of a composition having foam particles and binder; introduction of the composition into a space which is bounded on at least one side by a pressing surface; and exertion of pressure onto the composition by means of the pressing surface. The method further irradiation of microwaves through the pressing surface into the composition, while pressure is being exerted onto the composition. The invention furthermore relates to a device for carrying out the method according to the invention, having: at least one pressing surface and a counterbearing surface lying opposite, between which a space extends which is adapted to receive a composition of foam particles and binder. The pressing surface and counterbearing surface adjoin the space directly. The device further comprises at least one stiff layer which locally or entirely is essentially transparent for microwaves and has a surface facing toward the space, which is connected to the pressing surface in such a way as to transmit force. The device also comprises a microwave radiator unit which is arranged on a side of the stiff layer remote from the space and is aligned relative to the space in order to irradiate microwaves into the space through the stiff layer. Lastly, the invention relates to a microwave radiator unit for the heat treatment of foam compositions. The microwave radiator unit comprises a multiplicity of microwave antennas which are arranged in a plane array and at least two of which are connected through a distributor device to a common microwave signal source, which feeds the at least two antennas.
Abstract:
The invention relates to a method for producing expandable styrene polymers by polymerizing at least one vinyl aromatic monomer in an aqueous suspension in the presence of at least one halogenated polymer as a flame retardant, graphite, and blowing agent, characterized in that, at the start of the polymerization, the aqueous suspension contains 1 to 30 wt% of at least one styrene polymer with respect to the sum of monomers and styrene polymer and the styrene polymer used at the start of the polymerization likewise contains at least one halogenated polymer as a flame retardant.
Abstract:
Insecticide-modified bead material composed of expandable polystyrene (EPS), comprising at least one insecticide selected from the group of the insecticidal phenylpyrazoles, chlorfenapyr and hydramethylnon which is distributed in molecular dispersion in the polystyrene matrix.
Abstract:
The invention relates to a method for producing extruded polystyrene foam (XPS) moulded pieces provided with insecticide, comprising the following steps: (a) heating polystyrene (PS) to form a polymer melt, (b) introducing a blowing agent into the polymer melt to give a foamable melt and (c) foaming the foamable melt to give an XPS moulded piece, wherein in at least one of the steps (a) and/or (b), at least one insecticide from the group of phenylpyrazoles, chlorfenapyr and hydramethylnon is introduced into the melt.
Abstract:
The invention relates to a particle foam which contains 0.5 to 8 wt.-% of one or more corrosion inhibitors, selected from among amines, triazoles, carboxylic acid esters, carboxylic acid salts, nitrites, alcohols or mixtures thereof, to methods for producing said foam and to the use for packaging corrodible metal articles.
Abstract:
A composite foam containing A) foamed particles containing A1) 25 to 95% by weight styrene polymer(s), A2) optionally a blowing agent, A3) optionally one or more additives, B) an aminoplast component containing B1) 1 to 65% by weight cured, optionally modified, and optionally foamed aminoplast resin, B2) 0.1 to 20% by weight of one or more flame retardant organic phosphorous compounds having a phosphorous content of 5 to 80% by weight (based on the respective compound) and/or expanded graphite, B3) optionally one or more flame retardant synergists or the component B2), B4) optionally a blowing agent, B5) optionally one or more additives, wherein the percentages by weight - where not stated otherwise - relate to the sum of the components A1), B1) and B2), is suitable, in particular, as insulating material.
Abstract:
The invention relates to a method for the production of shaped foam bodies, comprising: provision of a composition having foam particles and binder; introduction of the composition into a space which is bounded on at least one side by a pressing surface; and exertion of pressure onto the composition by means of the pressing surface. The method further irradiation of microwaves through the pressing surface into the composition, while pressure is being exerted onto the composition. The invention furthermore relates to a device for carrying out the method according to the invention, having: at least one pressing surface and a counterbearing surface lying opposite, between which a space extends which is adapted to receive a composition of foam particles and binder. The pressing surface and counterbearing surface adjoin the space directly. The device further comprises at least one stiff layer which locally or entirely is essentially transparent for microwaves and has a surface facing toward the space, which is connected to the pressing surface in such a way as to transmit force. The device also comprises a microwave radiator unit which is arranged on a side of the stiff layer remote from the space and is aligned relative to the space in order to irradiate microwaves into the space through the stiff layer. Lastly, the invention relates to a microwave radiator unit for the heat treatment of foam compositions. The microwave radiator unit comprises a multiplicity of microwave antennas which are arranged in a plane array and at least two of which are connected through a distributor device to a common microwave signal source, which feeds the at least two antennas.
Abstract:
Disclosed is a layered composite system comprising one or several layers A) made of an open-cell foam based on an aminoplast, and one or several layers B) made of nonwoven fabric or fibrous tissue. Layer B contains melamine fibers. Also disclosed are production methods and the use of the inventive layered composite system as a cleaning sponge or protective support.
Abstract:
A process for the production of insecticide-modified bead material composed of expandable polystyrene (EPS) by extrusion, encompassing the steps of a) mixing, in a mixer, to incorporate a blowing agent and at least one insecticide from the group of the phenylpyrazoles, chlorfenapyr and hydramethylnon into a polymer melt which comprises at least one polystyrene, based on a vinylaromatic monomer, b) discharging the polymer melt comprising blowing agent, and c) pelletizing the polymer melt comprising blowing agent.