摘要:
A method of preparing a transparent polymer material includes mixing mineral nanoparticles selected from nanoparticles of alkaline-earth metal carbonates, alkaline-earth metal sulfates, metallic oxides, oxides of metalloids, and siloxanes, and a composition A including at least one thermoplastic polymer in the molten state selected from polycarbonate (PC), polystyrene (PS) and polymethyl methacrylate (PMMA) in order to obtain a master-batch, the mixture of step i) including at least 25% and at most 75% by weight of the mineral nanoparticles. The master-batch obtained in step i) is mixed with a composition B of a thermoplastic polycarbonate matrix (PCm) in the molten state, to obtain a transparent polymer material including at most 10% by weight of the mineral nanoparticles, preferably at most 5% by weight of the mineral nanoparticles.
摘要:
A method of preparing a transparent polymer material includes mixing mineral nanoparticles selected from nanoparticles of alkaline-earth metal carbonates, alkaline-earth metal sulfates, metallic oxides, oxides of metalloids, and siloxanes, and a composition A including at least one thermoplastic polymer in the molten state selected from polycarbonate (PC), polystyrene (PS) and polymethyl methacrylate (PMMA) in order to obtain a master-batch, the mixture of step i) including at least 25% and at most 75% by weight of the mineral nanoparticles. The master-batch obtained in step i) is mixed with a composition B of a thermoplastic polycarbonate matrix (PCm) in the molten state, to obtain a transparent polymer material including at most 10% by weight of the mineral nanoparticles, preferably at most 5% by weight of the mineral nanoparticles.
摘要:
Alkaline earth metal carbonate exhibiting a resistance to acids expressed as pH of less than 7 measured after suspending 1.0 g of the particles in a mixture made of 20 ml of toluene and 80 ml of an aqueous phase consisting of deionized water, 11.76 g/L of citric acid monohydrate, 2.57 g/L of NaCl and 0.068 mol/L of NaOH, after 35 minutes of stirring at 25° C. and at 1 000 rpm, or expressed as a moisture pick-up lower than or equal to 2 g water/kg of calcium carbonate after one week of storage at 22° C. and 50% relative humidity, or as a Differential Scanning Calorimetry (DSC) spectrum showing at least one peak between 170 and 190° C. when measured at a heating rate of 10° C./min under nitrogen atmosphere from 25 to 250° C. in open cells. Process for the preparation of said particles, compositions containing said particles and the use thereof.
摘要翻译:表现出耐酸性的碱土金属碳酸盐,其表现为pH小于7,将1.0g颗粒悬浮在由20ml甲苯和80ml由去离子水组成的水相中,11.76g / L 柠檬酸一水合物,2.57g / L NaCl和0.068mol / L NaOH,在25℃和1000rpm下搅拌35分钟后,或表现为低于或等于2g水的吸湿 / kg碳酸钙,在22℃和50%相对湿度下储存一周后,或作为差示扫描量热法(DSC)光谱,显示在170和190℃之间的至少一个峰值。当以加热速率 10℃/ min,在氮气氛下,25〜250℃,在开孔中。 所述颗粒的制备方法,含有所述颗粒的组合物及其用途。
摘要:
Process for the production of precipitated calcium carbonate particles, structured at the nanoscale, by carbonation of milk of lime in the presence of a crystallization controller selected from the following list: polyaspartic acid, dioctyl sodium sulphosuccinate, polyacrylic acid, the molecular weight of which is between 500 and 15 000, and citric acid. When the crystallization controller is citric acid, its concentration in the milk of lime is between 5 and 15%.
摘要:
A method of preparing a transparent polymer material includes i) obtaining composite nanoparticles having mineral nanoparticles at least partially coated with at least one monomer and/or at least one polymer suitable for promoting physicochemical interactions at the interface between the mineral nanoparticles and a thermoplastic polycarbonate matrix, the mineral nanoparticles being surface-modified by the monomer and/or the polymer, either directly by grafting or directly by adsorption of the monomer and/or polymer onto the surface of the mineral nanoparticles; or via a coupling agent selected from a chlorosilane or an organosilane including a functional group that is capable of reacting by a radical pathway. The composite nanoparticles obtained in step i) are mixed with the thermoplastic polycarbonate matrix in the molten state to obtain the transparent polymer material.
摘要:
Tablet comprising at least one biologically active substance and an excipient, in which the excipient contains calcium carbonate and at least one additive selected from fatty acids, their salts, their esters, lipid materials, polysaccharides, polyvinylpyrrolidone and polyvinylpyrrolidone derivatives, acrylic compounds, mono-, di- or triglyceride esters, animal proteins, and mixtures of at least two of these. Method for producing these tablets. Use of calcium carbonate in tablets containing at least one biologically active substance, for the prolonged release of this substance.
摘要:
A method of preparing a transparent polymer material includes i) obtaining composite nanoparticles having mineral nanoparticles at least partially coated with at least one monomer and/or at least one polymer suitable for promoting physicochemical interactions at the interface between the mineral nanoparticles and a thermoplastic polycarbonate matrix, the mineral nanoparticles being surface-modified by the monomer and/or the polymer, either directly by grafting or directly by adsorption of the monomer and/or polymer onto the surface of the mineral nanoparticles; or via a coupling agent selected from a chlorosilane or an organosilane including a functional group that is capable of reacting by a radical pathway. The composite nanoparticles obtained in step i) are mixed with the thermoplastic polycarbonate matrix in the molten state to obtain the transparent polymer material.
摘要:
Alkaline earth metal carbonate exhibiting a resistance to acids expressed as pH of less than 7 measured after suspending 1.0 g of the particles in a mixture made of 20 ml of toluene and 80 ml of an aqueous phase consisting of deionized water, 11.76 g/L of citric acid monohydrate, 2.57 g/L of NaCl and 0.068 mol/L of NaOH, after 35 minutes of stirring at 25° C. and at 1 000 rpm, or expressed as a moisture pick-up lower than or equal to 2 g water/kg of calcium carbonate after one week of storage at 22° C. and 50% relative humidity, or as a Differential Scanning Calorimetry (DSC) spectrum showing at least one peak between 170 and 190° C. when measured at a heating rate of 10° C./min under nitrogen atmosphere from 25 to 250° C. in open cells. Process for the preparation of said particles, compositions containing said particles and the use thereof.
摘要翻译:表现出耐酸性的碱土金属碳酸盐,其表现为pH小于7,将1.0g颗粒悬浮在由20ml甲苯和80ml由去离子水组成的水相中,11.76g / L 柠檬酸一水合物,2.57g / L NaCl和0.068mol / L NaOH,在25℃和1000rpm下搅拌35分钟后,或表现为低于或等于2g水的吸湿 / kg碳酸钙,在22℃和50%相对湿度下储存一周后,或作为差示扫描量热法(DSC)光谱,显示在170和190℃之间的至少一个峰值。当以加热速率 10℃/ min,在氮气氛下,25〜250℃,在开孔中。 所述颗粒的制备方法,含有所述颗粒的组合物及其用途。
摘要:
Tablet comprising at least one biologically active substance and an excipient, in which the excipient contains calcium carbonate and at least one additive selected from fatty acids, their salts, their esters, lipid materials, polysaccharides, polyvinylpyrrolidone and polyvinylpyrrolidone derivatives, acrylic compounds, mono-, di- or triglyceride esters, animal proteins, and mixtures of at least two of these. Method for producing these tablets. Use of calcium carbonate in tablets containing at least one biologically active substance, for the prolonged release of this substance.
摘要:
Use of nanoparticles of barium sulfate or of calcium carbonate, with a particle size of less than or equal to 150 nm and greater than or equal to 0.5 nm, as filler in transparent polymer compositions. The compositions obtained simultaneously show good scratch resistance, good impact strength, good tensile strength, good heat stability and good visible and UV radiation stability, while at the same time conserving excellent transparency. The compositions may be used as replacement materials for glass in the motor vehicle sector and in the optics sector.