Abstract:
The invention relates a method for producing, by mixing the individual components, thermoplastic molding materials which contain A) a thermoplastic polyamide, B) a composition containing b1) a graft polymer, containing a rubber as the graft basis and a graft coat based on unsaturated monomers, and b2) a matrix polymer, and C) a rubber-free copolymer containing c1) at least 30 % by weight of units that are derived from a vinyl-aromatic monomer, based on the total weight of all units that are contained in C), c2) units that are derived from a monomer that has a functional group that is reactive with the terminal groups of the polyamide A), and c3) units that are derived from a monomer that has no functional groups that are reactive with the terminal groups of the polyamide A). The method is characterized by producing in a first step a graft copolymer D) containing the total quantity of component C) and a partial quantity of component A) and mixing in a second step the graft copolymer D) with the remaining components and with the remaining quantity of components A).
Abstract:
The present invention relates to thermoplastic plastic moulding compositions, comprising a mixture composed of (A) from 30 to 69% by weight, based on the entirety of components (A), (B) and (C), of a methyl methacrylate polymer, (B) from 30 to 69% by weight, based on the entirety of components (A), (B) and (C), of a copolymer, obtainable via polymerization of a vinylaromatic monomer and of a vinyl cyanide, and (C) from 1 to 40% by weight, based on the entirety of components (A), (B) and (C), of a graft copolymer, obtainable from (C1) from 60 to 90% by weight, based on (C), of an agglomerated core based on a 1,3-diene, (C2) from 5 to 20% by weight, based on (C), of a first graft shell composed of a vinylaromatic monomer, of an alkyl methacrylate, and, if appropriate, of a crosslinking monomer, and (C3) from 5 to 20% by weight, based on (C), of a second graft shell composed of an alkyl (meth)acrylate polymer, with the proviso that the quantitative ratio of (C2) to (C3) is in the range from 2:1 to 1:2, and it is inventively significant here that the core (C1) has a monomodal particle size distribution, the average particle size D50 of the core (C1) (determined by the method mentioned in the description) is in the range from 300 to 400 nm, and the difference between the refractive index (nD-C) of the entire component (C) and the refractive index (nD-AB) of the entire matrix of components (A) and (B) is in the range from 0.003 to 0.008, each of the refractive indices being measured by the methods mentioned in the description, and also to processes for preparation of these moulding compositions, to their use, and to the mouldings obtainable therefrom.
Abstract:
The present invention relates to processes for preparing copolymers A) containing A1) one or more vinylaromatic monomers, A2) one or more vinyl cyanides and A3) one or more dicarboxylic anhydrides by bulk or solution polymerization, it being essential to the invention that the polymerization be performed in the presence of 0.01 to 0.5% by weight of water, based on the total weight of the polymerization mixture. The present invention further relates to the copolymers A), to thermoplastic moulding compositions comprising the copolymers A), to the use of the copolymers A) and of the thermoplastic moulding compositions, and to the mouldings, films, fibres and foams obtainable from the copolymers A) and the thermoplastic moulding compositions.
Abstract:
The present invention relates to a method for producing copolymers A) having a reduced dirt particle content, containing 49.2 to 93.2% by weight of structural units derived from one or more vinyl aromatic monomers (component A1)), 6 to 50% by weight of structural units derived from one or more vinyl cyanides (component A2)), 0.8 to 7% by weight of structural units derived from one or more dicarboxylic acid anhydrides (component A3)), and 0 to 25% by weight of structural units derived from further copolymerizable monomers (component A4)), wherein each weight percent is based on the total weight of the structural units derived from components A1), A2), A3), and A4) and together are 100% by weight, by means of mass or solution polymerization, wherein it is essential to the invention that the mathematical product of the weight percent of the structural units of the copolymer A) derived from the component A2) and of the weight percent of the structural units of the copolymer A) derived from the component A3) ranges between 40% by weight and 65% by weight. The present invention further relates to the copolymers A), to thermoplastic molding compounds containing the copolymer A), to the use of the copolymers A) and of the thermoplastic molding compounds, and to the molded bodies, films, fibers, and foams that can be obtained from the copolymers A) and the thermoplastic molding compounds.
Abstract:
The invention relates to thermoplastic molding materials containing a mixture consisting of: (A) 30 to 68.99 % by weight, with regard to the sum of constituents (A), (B), (C) and (D), of a methyl methacrylate polymer; (B) 30 to 68.99 % by weight, with regard to the sum of constituents (A), (B), (C) and (D), of a copolymer obtained by polymerizing a vinyl aromatic monomer and a vinyl cyanide; (C) 1 to 39.99 % by weight, with regard to the sum of constituents (A), (B), (C) and (D), of a graft copolymer obtained from (C1) 60 to 90 % by weight, with regard to (C), of a core obtained by polymerizing a 1,3-diene and a vinyl aromatic monomer, (C2) 5 to 20 % by weight, with regard to (C), of a first graft shell obtained by polymerizing a vinyl aromatic monomer, a C1-C8 alkyl ester of methacrylic acid and a cross-linking monomer, (C3) 5 to 20 % by weight, with regard to (C), of a second graft shell comprised of an alkyl(meth)acrylate polymer, with the provision that the ratio of (C2) to (C3) ranges from 2:1 to 1:2, and; (D) 0.01 to 39 % by weight, with regard to the sum of constituents (A), (B), (C) and (D), of at least one highly branched or hyperbranched polymer selected from the group consisting of (D1) highly branched or hyperbranched polycarbonates and (D2) highly branched or hyperbranched polyesters of type Ax + By, whereby x is at least 1.1 and y is at least 2.1. The invention also relates to methods for producing these molding compounds, to the use thereof, to the shaped bodies, fibers, films and foams that can be obtained therefrom, and to demolding auxiliary agents for thermoplastic molding compounds.
Abstract:
The present invention relates to thermoplastic plastic moulding compositions, comprising a mixture composed of (A) from 30 to 69% by weight, based on the entirety of components (A), (B) and (C), of a methyl methacrylate polymer, (B) from 30 to 69% by weight, based on the entirety of components (A), (B) and (C), of a copolymer, obtainable via polymerization of a vinylaromatic monomer and of a vinyl cyanide, and (C) from 1 to 40% by weight, based on the entirety of components (A), (B) and (C), of a graft copolymer, obtainable from (C1) from 60 to 90% by weight, based on (C), of an agglomerated core based on a 1,3-diene, (C2) from 5 to 20% by weight, based on (C), of a first graft shell composed of a vinylaromatic monomer, of an alkyl methacrylate, and, if appropriate, of a crosslinking monomer, and (C3) from 5 to 20% by weight, based on (C), of a second graft shell composed of an alkyl (meth)acrylate polymer, with the proviso that the quantitative ratio of (C2) to (C3) is in the range from 2:1 to 1:2, and it is inventively significant here that the core (C1) has a monomodal particle size distribution, the average particle size D50 of the core (C1) (determined by the method mentioned in the description) is in the range from 300 to 400 nm, and the difference between the refractive index (nD-C) of the entire component (C) and the refractive index (nD-AB) of the entire matrix of components (A) and (B) is in the range from 0.003 to 0.008, each of the refractive indices being measured by the methods mentioned in the description, and also to processes for preparation of these moulding compositions, to their use, and to the mouldings obtainable therefrom.