摘要:
Modified rubber compositions comprise by weight about 15-60% of a highly saturated aliphatic rubber such as ethylene-propylene-diene rubber, about 25-80% of acrylate monomer units; and less than about 5% multi-functional monomer units. The compositions exist as amorphous heterogeneously dispersed phases. The first phase comprises the copolymer rubber to which polymers of at least 10% of the other monomer units are grafted. The second phase comprises the other monomers polymerized as homo and copolymers, not grafted to the rubber. Optionally, up to 20% of the composition comprises high index monomer units. The high index monomer units may be copolymerized with the acrylate and grafted to the rubber. Greater than 10% of the monomer units other than rubber are grafted to the rubber. The number average molecular weight of the grafts is between 10,000 and 80,000 daltons. About 2-20% by weight of one or more polymers may be provided to adjust the refractive indices of the rubber or the polyacrylate phase in the final product such that when the composition is present at the 10% rubber level, the haze can be reduced to less than 20%.
摘要:
This invention concerns transparent polymer mixtures that can be processed thermoplastically consisting of (A) polycarbonates, particularly Bisphenol A polycarbonates, and (B) copolymers of methyl methacrylate and 5 to 40 wt. % of N-substituted maleimides, with the substituent on the imide nitrogen being an optionally substituted cyclohexyl group, in which the copolymer (B) can also be made up of other .alpha.,.beta.-unsaturated monomer units in amounts of 0 to 40 wt. %.
摘要:
A method for making thermostable methyl methacrylate/alpha-methylstyrene copolymers having a high heat distortion temperature and adaptable to use as molding compounds by emulsion polymerization of these monomers together with lower alkyl acrylates and/or styrene, the water phase being less than 70 weight percent of the total monomer/water components and the amount of emulsifier being less than 0.5 weight percent of the water component, the copolymer being isolated by freeze coagulation or extruder pinch-off.
摘要:
A bioactive PMMA (polymethylmethacrylate) bone cement contains a powder component and a reactive monomer liquid, wherein the powder component and the reactive monomer liquid when mixed with one another react with one another and form a polymer-based solid material. The powder component contains particulate polymer powder of polymethylmethacrylates; a radical starter; and anionic copolymer nanoparticles. The anionic copolymer nanoparticles are distributed in nano-particulate form within the particulate powder component or coated as a film on particles of the particulate polymer powder.
摘要:
The invention relates to a method for producing hybrid-particles containing polymer and SiO2-particles, wherein a) in a first polymerization step in aqueous medium a water-insoluble phase containing one or more monomeric and colloidal SiO2-particles having an average particle diameter of 1 to 150 nm are polymerized, and b) in a second polymerization step in aqueous medium one or more monomers are polymerized in the presence of the polymer obtained in the first polymerization step.
摘要:
A high surface area system is provided with latex particles for immobilization of substances containing nucleophilic groups. The high surface area system is formed by aggregating the latex particles or by bonding the latex particles to a porous support of high surface area. The latex particles contain groups such as oxirane groups that react with the nucleophilic groups. The substances containing nucleophilic groups may be enzymes or proteins such as albumin, immunoglobulins, blood-clotting factors, cell-membrane proteins or peptide hormones. The high surface area system may be used as a sorbent in removing pollutants, as a stationary phase in organic synthesis such as peptide synthesis, and in the therapeutic treatment of a patient.
摘要:
The invention relates to a molding mass which can be thermoplastically processed, characterized in that it consists of monomer units ofa) 80-99.9 wt.- % methyl methacrylate,b) 0.1-20 wt.- % ethylene,c) 0-19.9 wt.- % other comonomers.The invention further relates to a method for the production of the molding mass, as well as molded elements made from it.
摘要:
A method for producing branched polymerizates by radical polymerization of monomers in two stages comprising in a first stage, adding 10 to 500 parts by weight of at least one monomer M.sub.1 and 0.1 to 20 parts by weight of a mercaptan with an olefinic, radically polymerizable double bond RM as a molecular weight regulator, and polymerizing said at least one monomer M.sub.1 mercaptan RM to form a copolymer MM.sub.1 in the presence of at least one polymerization initiator and 0 to 100 parts by weight of an inert, non-aqueous solvent, which completely dissolves the monomer M.sub.1, the mercaptan RM and the copolymer MM.sub.1, where the polymerizable double bonds of M.sub.1 and RM have a reactivity, expressed by a copolymerization parameter r, between 0.1 and 10, and in a second stage, adding 10 to 2000 parts by weight of a monomer M.sub.2 and 0.01 to 10 parts by weight of a saturated molecular weight regulator, and optionally, an inert, non-aqueous solvent, to the reaction mixture formed in the first stage, and polymerizing in the presence of at least one polymerization initiator to form a branched polymerizate. Branched polymerizates made by the method.
摘要:
The invention relates to a recycable, heat-sealable plastic film for hermetically sealing plastic containers, comprising at least two layers which mutually adhere, (i) a support layer comprised of an impact resistant polystyrene resin and (ii) a sealing layer consisting essentially of: a) 20-100 weight % of a copolymer P consisting essentially of:(p1) 20-90 weight % methyl methacrylate and/or ethyl methacrylate;(p2) 10-80 weight % of at least one monomer of formula I ##STR1## where R.sub.1 represents an C.sub.3-24 alkyl group; and (p3) 0-10 weight %, preferably 1-8 weight %, of a monomer which is copolymerizable with and different from the monomers (p1) and (p2); and(b) 0-80 weight % of a block copolymer containing styrene blocks.
摘要:
The invention relates to a polymerization process for the production of polymethacrylate molding compounds having high heat deflection temperature and high stability against thermal degradation, are prepared by polymerizing methacrylate monomer in a reaction medium such that at least 70 wt. % of the polymethacrylate molding compound is produced at a monomer concentration in the reaction medium of at least 5 mol per liter.