摘要:
The invention relates to core-shell structured silicone rubber graft polymers that comprise a core a) from a silicium-organic polymer that corresponds to the general formula (R2SiO2/2)x.(RSiO3/2)y.(SiO4/2)z, wherein x=0 to 99.5 mole %, y=0.5 to 100 mole %, z=0 to 50 mole %, wherein R is the same or different and represents alkyl or alkenyl groups having 1 to 6 C atoms, aryl groups or substituted hydrocarbon groups and at last one shell c) from an organic polymer. The silicone rubber graft copolymers are obtained by producing the organic shell c) by radical polymerization at a temperature of not more than 65° C. and adding the initiator in at least two portions to the reaction vessel, with a further addition at least 2 minutes after start of the polymerization.
摘要:
The present invention relates to a core-shell particle which has a core, a first shell and, where appropriate, a second shell, where: i) the core encompasses, based on its total weight, at least 75.0% by weight of (meth)acrylate repeat units; ii) the first shell has a glass transition temperature below 30° C.; iii) the second shell present where appropriate encompassed, based on its total weight, at lest 75.0% by weight of (meth)acrylate repeat units; iv) the first shell encompasses, based on its total weight, the following constituents; E) from 92.0 to 98.0% by weight of (meth)acrylate repeat units and F) from 2.0 to 8.0% by weight of styrenic repeat units of the general formula (I) where the radicals R1 to R6 are defined according to the Description and the percentages by weight of E) and F) give a total of 100.0% by weight, v) the radius of the core-shell particle inclusive of any second shell present, measured by the Coulter method, is in the range from above 160.0 to 240.0 nm. The present invention further relates to a process for preparing core-shell particles, to a moulding composition comprising core-shell particles, and to the use thereof.
摘要:
The present invention relates to a core-shell particle which has a core, a first shell and, where appropriate, a second shell, where: i) the core encompasses, based on its total weight, at least 75.0% by weight of (meth)acrylate repeat units; ii) the first shell has a glass transition temperature below 30° C.; iii) the second shell present where appropriate encompassed, based on its total weight, at lest 75.0% by weight of (meth)acrylate repeat units; iv) the first shell encompasses, based on its total weight, the following constituents; E) from 92.0 to 98.0% by weight of (meth)acrylate repeat units and F) from 2.0 to 8.0% by weight of styrenic repeat units of the general formula (I) where the radicals R1 to R6 are defined according to the Description and the percentages by weight of E) and F) give a total of 100.0% by weight, v) the radius of the core-shell particle inclusive of any second shell present, measured by the Coulter method, is in the range from above 160.0 to 240.0 nm; a process for preparing core-shell particles, to a moulding composition comprising core-shell particles, and to the use thereof.
摘要:
The invention relates to core-shell structured silicone rubber graft polymers that comprise a core a) from a silicium-organic polymer that corresponds to the general formula (R2SiO2/2)x.(RSiO3/2)y.(SiO4/2)z, wherein x=0 to 99.5 mole %, y=0.5 to 100 mole %, z=0 to 50 mole %, wherein R is the same or different and represents alkyl or alkenyl groups having 1 to 6 C atoms, aryl groups or substituted hydrocarbon groups and at last one shell c) from an organic polymer. The silicone rubber graft copolymers are obtained by producing the organic shell c) by radical polymerization at a temperature of not more than 65° C. and adding the initiator in at least two portions to the reaction vessel, with a further addition at least 2 minutes after start of the polymerization.
摘要:
The invention relates to impact-resistant moulding materials comprising poly(meth)acrylate and at least one silicon rubber graft polymer comprising between 0.05 and 95 wt. %, in relation to the total weight of the copolymer, of a core a) consisting of an organosilicon polymer of general formula (R2SiO2/2)x (RSiO3/2)Y (SiO4/2)x wherein x=between 0 and 99.5 mole %, y=between 0.5 and 100 mole %, z=between 0 and 50 mole %, and R represents alkyl or alkenyl radicals comprising between 1 and 6 C atoms and being the same or different, aryl radicals or substituted hydrocarbon radicals; between 0 and 94.5 wt. %, in relation to the total weight of the copolymer, of a polydialkylsiloxane layer b); between 5 and 95 wt. %, in relation to the total weight of the copolymer, of an envelope c) consisting of organic polymers. The invention is characterised in that the core a) comprises vinyl groups, and the envelope c) can be obtained by radical polymerisation of a mixture containing acrylic acid esters and methacrylates.
摘要:
The invention relates to a polymer mixture based on the (meth)acrylate (co)polymer components a), b), c), and/or d) according to claim 1, where a test specimen produced from the polymer mixture simultaneously has the following properties: I. a tensile modulus (ISO 527) of at least 2600 MPa, II. a Vicat softening point VSP (ISO 306-B50) of at least 109° C., III. an impact strength (ISO 179-2D, flatwise) of at least 17 kJ/m2, and IV. a melt index MVR (ISO 1133, 230° C./3.8 kg) of at least 1.5 cm3/10 min. The invention further relates to injection mouldings and to the use of the polymer mixture for producing injection-moulded parts.
摘要:
The invention relates to an impact-modified moulding composition which has particularly high impact resistance at low temperatures (−20° C., −40° C.). This low-temperature impact resistance is achieved by using a silicone elastomer.
摘要:
The invention relates to an impact-modified molding composition which has particularly high impact resistance at low temperatures (−20° C., −40° C.). This low-temperature impact resistance is achieved by using a silicone elastomer.
摘要:
A moulding compound comprises a copolymer (I)a), produced by polymerisation of 90-100% by weight methylmethacrylate, styrene and malic acid anhydride, and optionally 0-10% by weight additional monomers which can be copolymerised with methylmethacrylate, a (co)polymer (II)b), produced by polymerisation of 80-100% by weight methylmethacrylate and optionally 0-20% by weight additional monomers which can be copolymerised with methylmethacrylate, and has a solution viscosity in chloroform at 25° C. (ISO 1628 Part 6) of 50 to 55 ml/g, as well as c) optional conventional additives, auxiliary agents and/or fillers. The moulding compound is characterised in that the copolymer (I) has a solution viscosity in chloroform at 25° C. (ISO 1628 Part) of 55 ml/g or less. Also disclosed are mouldings produced by thermoplastic processing of the moulding compound and their uses.