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:
Materiales termoplásticos de moldeo que contienen, con respecto al material de moldeo, A) del 5 al 80% en peso de al menos una fase de caucho compuesta de un polímero elástico como el caucho con una temperatura de transición vítrea Tg de 0°C o inferior, y B) del 20 al 95% en peso de al menos una fase dura no producida en presencia de A), compuesta de un homopolímero de estireno o copolímeros de estireno a partir de estireno y/o a- metilestireno con metacrilato de metilo, N-fenilmaleimida, anhídrido maleico, o acrilonitrilo o mezclas de los monómeros mencionados con una polidispersividad baja expresada a través del índice de polidispersividad (PDI)
Abstract:
Undesirable changes in shade brought about by low temperatures (Cold Stress Whitening) in impact-modified thermoplastic molding compositions F which comprise at least one elastomeric graft polymer A and at least one thermoplastic polymer B are reduced by adding from 10 to 200 ppm, based on the molding compositions F, of at least one polyorganosiloxane S to the impact-modified thermoplastic molding composition F.
Abstract:
A process for the production of rubber particles containing 80-100 wt.% of a conjugated diene monomer and 0-20 wt.% of a monoethylenically unsaturated comonomer comprises emulsion polymerization in the presence of an emulsifier and an initiator whereby the monomers are added either in polymerized form as a seed latex or in monomeric form via subsequent in-situ polymerization to form a seed latex. A process for the production of rubber particles (I) containing in polymerized form (A) 80-100 wt.% of at least one conjugated diene monomer and (B) 0-20 wt.% of at least one monoethylenically unsaturated comonomer, comprises emulsion polymerization in the presence of an emulsifier and an initiator whereby: (1) a mixture (M1) comprising (M1a) 20-100 wt.% water and (M1b) 0.1-100 wt.% emulsifier is added; (2) simultaneously or thereafter a mixture (M2) comprising (M2a) 90-100 wt.% of styrene, alpha -methylstyrene, butadiene, n-butylacrylate, methylmethacrylate and/or acrylonitrile and (M2b) 0-10 wt.% of at least one copolymerizable monomer whereby monomers (M2a) and (M2b) are added either in polymerized form as a seed latex or in monomeric form via subsequent in-situ polymerization to form a seed latex, or as a mixture of polymerized and monomeric forms, whereby the seed-latex polymer has an average mol. wt. of greater than 2000; (3) the polymerization of the resulting mixture is initiated in the presence of the polymerization initiator at 5-95 [deg]C; (4) simultaneously or thereafter a mixture (M3) comprising (M3a) 0-100 wt.% comonomer (B) (wrt (B)) and (M3b) 0-25 wt.% diene monomer (A) (wrt (A)) is added; (5) simultaneously or thereafter a mixture (M4) comprising (M4a) the residual 75-100 wt.% (A) (wrt (A)) and (M4b) the residual 0-100 wt.% (B) (wrt (B)); and (6) polymerization is carried out to a conversion of 90-95 (wrt the total amount of monomers) whereby the residual 0-80 wt.% of the emulsion water and the residual 0-99.9 wt.% of the emulsifier are added individually or separately at one or more steps (2)-(5). An independent claim is included for the resulting rubber particles (I).
Abstract:
The invention relates to thermoplastic moulding materials containing a mixture of (A) between 30 and 69 wt. %, in relation to the sum of the constituents (A), (B) and (C), of a methylmethacrylate polymer, (B) between 30 and 69 wt. %, in relation to the sum of the constituents (A), (B) and (C), of a copolymer that can be obtained by the polymerisation of a vinylaromatic monomer and a vinylcyanide, and (C) between 1 and 40 wt. %, in relation to the sum of the constituents (A), (B) and (C), of a graft copolymer that can be obtained from (C1) between 60 and 90 wt. %, in relation to (C), of a core, (C2) between 5 and 20 wt. %, in relation to (C), of a first graft envelope consisting of a vinylaromatic monomer, an alkylmethacrylate and optionally a cross-linking monomer, and (C3) between 5 and 20 wt. %, in relation to (C), of a second graft envelope consisting of an alkyl(meth)acrylate polymer, on the proviso that the quantitative ratio of (C2) to (C3) is between 2:1 and 1:2. The invention is characterised in that the average particle size D50 of the core (C1) is between 50 and 250 nm, the average particle size D90 of the core (C1) is between 60 and 1000 nm, the average particle size D90 of the core (C1) being larger than the average particle size D50 of the core (C1), by a factor between 1.15 and 20, and the core (C1) can be obtained by the polymerisation of a monomer mixture comprising (C11) between 65 and 89 wt. %, in relation to (C1), of a 1,3-diene, (C12) between 10 and 34.9 wt. %, in relation to (C1), of a vinylaromatic monomer, and (C13) between 0.1 and 5 wt. %, in relation to (C1), of an agglomeration polymer. The invention also relates to a method for producing said moulding masses, to the use thereof, and to the moulded bodies obtained therefrom.
Abstract:
Preparation of a particle-forming rubber (I) comprising at least a fraction of agglomerated particle, where at least a fraction exhibits a defined non-uniformity, comprises agglomeration of a particle-forming substrate rubber that is present in an emulsion by means of at least one particle-forming agglomerated latex A exhibiting a defined non-uniformity of = 0.65. Independent claims are included for: (1) a particle-forming rubber that is produced by the process; (2) an agglomerated lattice A with a defined non-uniformity produced by emulsion polymerization of one or more hydrophobic monomer followed by emulsion polymerization of a monomer mixture comprising hydrophobic and hydrophilic monomer in the presence of an alkali salt of an acid, a sulfate or sulfonate with 10-20C aliphatic residue as an emulsifier; (3) use of an agglomerated lattice A for the manufacture of the particle-forming substrate rubber in emulsion for the production of particle-forming rubber containing at least a fraction of agglomerated particle, where at least a fraction exhibits defined non-uniformity of less than 1; (4) a rubber-like graft-copolymer (p1) formed from 30-99 (preferably 30-90) wt.%, based on p1, of a particle-forming rubber obtained from the above process, as a graft substructure; 1-70 (preferably 10-70) wt.%, based on p1, of a graft substructure grafted coating (p2) with a glass transition temperature of more than 50[deg]C, preferably formed from 50-100 wt.%, related on (p2), of at least one vinyl-aromatic monomer (p21), 0-50 wt.%, based on (p2), of at least a polar, copolymerizable comonomer (p22), preferably acrylonitrile, methacrylnitrile, ester of (meth)acryl acid with 1-4C alkyl, malein acidanhydride and its imide, (meth) acrylamide and vinylalkylether with 1-8C alkyl; 0-40 wt.%, based on (p2), of one or more further monoethylenic unsaturated monomer (p23), where (p21), (p22) and (p23) constitutes to 100 wt.%; or (p24) 50-100 wt.-%, based on (p2), (p25) 0-50 wt.%, based on (p2), of at least a further copolymerizable monomer, preferably styrol, (meth)acrylnitrile or ester of acrylic acid, where the (p24) and (p25) constitutes to 100 wt.%; (5) a thermoplastic molded mass comprising a rubber-like grafted-copolymer (t0) and matrix polymer (t2), preferably polymer obtained from styrol-acrylnitrile, (alpha -methylstyrol-acrylnitrile)-, styrolmaleinimide and styrol-maleinic acid anhydride and/or (t2) partial-crystalline, preferably linear, polyamide such as polyamide-6, polyamide-6,6, polyamide-4,6, polyamide-6,12 or partial-crystalline copolyamide; and/or (t3) polyester like polymethylmethacrylate; and/or (t4) aromatic aliphatic polyester, preferably polybutyleneterephthalate, polypropyleneterephthalate, polyethylenenaphthalate or polyethyleneterephthalate; and/or (t5) polyoxyalkylene e.g. polyoxymethylene; and/or (t6) polycarbonate; and/or (t7) polyarylenesulfide, preferably polyphenylenesulfide; and (t8) optionally fiber-or particle-forming fillers or their mixtures; and (t9) optionally other additives; (6) a molded mass obtained from thermoplastic molded mass; and (7) a procedure for the control of non-uniformity of at least an agglomerated fraction of particle-forming through agglomeration agent of agglomerated lattice A producing rubber, where the agglomerated lattice A is particle-forming, comprising emulsion polymerization of at least a hydrophobic monomer followed by a monomer mixture extensively hydrophobic and hydrophilic monomer in the presence of an emulsifier, and with a particle-forming substrate rubber that is present in the emulsion.
Abstract:
A process for the agglomeration of at least one rubber (A), dispersed in an aqueous phase, by the addition of a dispersion of at least one agglomerating polymer (B) in aqueous phase, in which the agglomerating polymer B used is one containing substantially no free acid groups and the agglomeration is carried out in the presence of at least one basic electrolyte.
Abstract:
A process for the production of rubber particles containing 80-100 wt.% of a conjugated diene monomer and 0-20 wt.% of a monoethylenically unsaturated comonomer comprises emulsion polymerization in the presence of an emulsifier and an initiator whereby the monomers are added either in polymerized form as a seed latex or in monomeric form via subsequent in-situ polymerization to form a seed latex. A process for the production of rubber particles (I) containing in polymerized form (A) 80-100 wt.% of at least one conjugated diene monomer and (B) 0-20 wt.% of at least one monoethylenically unsaturated comonomer, comprises emulsion polymerization in the presence of an emulsifier and an initiator whereby: (1) a mixture (M1) comprising (M1a) 20-100 wt.% water and (M1b) 0.1-100 wt.% emulsifier is added; (2) simultaneously or thereafter a mixture (M2) comprising (M2a) 90-100 wt.% of styrene, alpha -methylstyrene, butadiene, n-butylacrylate, methylmethacrylate and/or acrylonitrile and (M2b) 0-10 wt.% of at least one copolymerizable monomer whereby monomers (M2a) and (M2b) are added either in polymerized form as a seed latex or in monomeric form via subsequent in-situ polymerization to form a seed latex, or as a mixture of polymerized and monomeric forms, whereby the seed-latex polymer has an average mol. wt. of greater than 2000; (3) the polymerization of the resulting mixture is initiated in the presence of the polymerization initiator at 5-95 [deg]C; (4) simultaneously or thereafter a mixture (M3) comprising (M3a) 0-100 wt.% comonomer (B) (wrt (B)) and (M3b) 0-25 wt.% diene monomer (A) (wrt (A)) is added; (5) simultaneously or thereafter a mixture (M4) comprising (M4a) the residual 75-100 wt.% (A) (wrt (A)) and (M4b) the residual 0-100 wt.% (B) (wrt (B)); and (6) polymerization is carried out to a conversion of 90-95 (wrt the total amount of monomers) whereby the residual 0-80 wt.% of the emulsion water and the residual 0-99.9 wt.% of the emulsifier are added individually or separately at one or more steps (2)-(5). An independent claim is included for the resulting rubber particles (I).