摘要:
A process for production of a polyester comprising units of ethylene terephthalate as the major repeating units by supplying terephthalic acid and ethylene glycol continuously or intermittently to bis(beta-hydroxyethyl) terephthalate or its oligomer so as to carry out esterification under a pressure of not more than about 1.0 kg/cm.sup.2, followed by polycondensation, which is characterized in that at least one magnesium compound is incorporated into the reaction system in an amount of about 30 to 400 ppm in terms of Mg to the polyester when the esterification rate in the step of esterification reaches about 20-80% and at least one phosphorus compound is incorporated into the reaction system in an amount as satisfying the following equation (I) at the stage after the esterification rate reaches not less than about 91% and before the termination of the initial condensation in the step of esterification:1.2.ltoreq.Mg/P.ltoreq.20 (I)wherein Mg/P is the atomic ratio of the magnesium atom to the phosphorus atom. The produced polyester shows a high electrostatic adherence.
摘要翻译:一种通过连续或间歇地向双(β-羟乙基)对苯二甲酸酯或其低聚物供应对苯二甲酸和乙二醇作为主要重复单元的聚对苯二甲酸乙二醇酯单元的生产方法,以在不超过一个压力下进行酯化 约1.0kg / cm 2,然后进行缩聚,其特征在于当步骤中的酯化速率在聚酯中时,至少一种镁化合物以约30-400ppm的量掺入反应体系中 的酯化达到约20-80%,并且在酯化速率达到不低于约91%之后且在终止之前的阶段,至少一种磷化合物以满足以下等式(I)的量引入反应体系中 在酯化步骤中的初始缩合:1.2 Mg / P 20(I)其中Mg / P是镁原子与磷酸根的原子比 原子 所生产的聚酯显示出高的静电附着力。
摘要:
A polyester having an initial accumulation electric charge of not less than 2.9 .mu.c/mm.sup.2 when determined in a melt state according to the method as hereinabove defined and a heat resistance of not more than 0.210 when determined according to the method as hereinabove defined, which comprises at least one magnesium compound and at least one phosphorus compound solubilized therein in amounts as satisfying the following formulas:30.ltoreq.[Mg].ltoreq.400 (1)0.8.ltoreq.Mg/P.ltoreq.3 (2)wherein [Mg] is the content (ppm) of the magnesium compound in terms of magnesium atom to the polyester and Mg/P is the atomic ratio of the magnesium atom in the magnesium compound to the phosphorus atom in the phosphorus compound.
摘要翻译:当根据上述方法在熔融状态下测定时,具有不小于2.9μc/ mm 2的初始蓄电量的聚酯,并且当根据上述方法测定时耐热性不大于0.210, 包含至少一种镁化合物和至少一种溶解在其中的磷化合物,其量满足下式:30 [Mg]≤400(1)0.8 Mg / P 3(2) 其中,[Mg]为镁化合物相对于聚酯的含量(ppm),Mg / P为磷化合物中镁化合物中的镁原子与磷原子的原子比。
摘要:
A biaxially stretched polyester film comprising a polyester and zirconium as an internal particle material, produced by polycondensation of terephthalic acid or its esterified derivative and alkylene glycol as the major essential monomeric components in the presence of a polycondensation catalyst, during which zirconium in the form of any compound thereof in an amount of 80 to 2500 ppm in terms of zirconium atom to the polyester as produced being introduced into the reaction system at a stage after the initiation of the reaction and before the intrinsic viscosity of the reaction mixture reaching 0.2, and subjecting the produced polyester to film forming.
摘要:
An oriented polyester film having at least one surface being roughened by containing inactive particles and three-dimensional surface roughness exponents of the said roughened surface are within ranges simultaneously satisfying the following relationships (I) to (III), while the number of coarse projections is in excess of the fourth grade:0.014.ltoreq.S.DELTA.a.ltoreq.0.025 (I)5.2.ltoreq.S.lambda.a.ltoreq.13.0 (II)0.012.ltoreq.SRa.ltoreq.0.050 (III)where S.DELTA.a represents three-dimensional average gradient, S.lambda.a represents the spatial average wavelength (.mu.m) of three-dimensional surface roughness and SRa represents three-dimensional central plane average roughness (.mu.m).
摘要翻译:具有至少一个表面通过含有惰性颗粒而被粗糙化的表面的粗糙表面的三维表面粗糙度指数的取向聚酯薄膜在同时满足以下关系式(I)至(III)的范围内的范围内,而粗突起数为 超过四年级:0.014 = S DELTA a = 0.025(I)5.2 = Sλa = 13.0(II)0.012 = SRa 0.050(III)其中S DELTA a表示三维平均梯度,Sλa表示三维表面粗糙度的空间平均波长(μm),SRa表示三维中心平面平均粗糙度(μm)。
摘要:
An oriented polyester film comprising ethylene terephthalate as the major repeating unit, which comprises particles of kaolinite and calcium carbonate uniformly dispersed therein, said kaolinite and said calcium carbonate having each an average particle size of 0.05 to 0.8 micron and being contained in such amounts as satisfying the following equations:70.ltoreq.D.times.A.ltoreq.1000 (I)1000.ltoreq.A+B.ltoreq.10000 (II)0.1.ltoreq.B/A.ltoreq.25 (III)wherein D is an average particle size (micron) of calcium carbonate, A is a content (ppm) of calcium carbonate and B is a content (ppm) of kaolinite, said oriented polyester film being excellent in flatness, slipperiness, abrasion resistance, etc. with a small number of coarse particles.
摘要翻译:一种包含对苯二甲酸乙二醇酯作为主要重复单元的定向聚酯膜,其包含均匀分散在其中的高岭石和碳酸钙颗粒,所述高岭石和所述碳酸钙的平均粒度均为0.05至0.8微米,并且其含量满足 以下等式:70 = DxA = 1000(I)1000 = A + B = 10000(II)0.1 = B / A 25(III)其中D是平均粒子 碳酸钙的尺寸(微米),A是碳酸钙的含量(ppm),B是高岭石的含量(ppm),所述取向聚酯膜的平坦度,光滑性,耐磨性等优异,少量 粗颗粒
摘要:
A thermo-shrinkable polyester film of this invention is obtained from a composition that comprises acid components including terephthalic acid and glycol components including ethyleneglycol. The polyester film has a heat-shrinkage ratio of 30% or more in a certain direction at 100.degree. C., and a shrinkage ratio of 5% or more at the point of intersection of a curve showing the internal shrinkage stress of the film and a curve showing the tensile stress of the film.
摘要:
An oriented polyester film comprising ethylene terephthalate as the major repeating units, which comprises 0.01 to 1.0% by weight of silica particles and/or titanium dioxide particles having each an average particle size of 0.01 to 0.5.mu. and 0.005 to 1.0% by weight of calcium carbonate having an average particle size of 0.01 to 0.5.mu., which provides an oriented polyester film for the base film of video tape which has a flatness on the surface and has excellent slipperiness, abrasion resistance and running characteristics as well as excellent magnetic transducer characteristics.
摘要:
A process for preparing a polyamide type film which comprises melt-extruding a polyamide resin having a metal compound and a melt specific resistance of not more than 1.5.times.10.sup.5 .OMEGA.cm at 260.degree. C. in a form of a film, contacting the melt-extruded film closely with a revolving cooling drum through static electricity and taking up the film while cooling rapidly to solidify, which provides remarkable improved adhesion by static electricity. As a result, increasing the take-up rate of the revolving cooling drum does not cause trapping of air between the drum and the film so that a film having excellent uniformity in thickness and transparency can be produced.
摘要:
The present invention provides a thermoplastic polyester elastomer excellent in heat resistance, heat-aging resistance, water resistance, light resistance, low-temperature property and the like, and further excellent in block order-retaining ability, the thermoplastic polyester elastomer comprising a hard segment which comprises polyester constituted with aromatic dicarboxylic acid and aliphatic or alicyclic diol and a soft segment which comprises mainly aliphatic polycarbonate, wherein the hard segment and the soft segment being connected, and wherein when melting points of the thermoplastic polyester elastomer are obtained by measuring on a differential scanning calorimeter in three cycles in which a temperature is raised from room temperature to 300° C. at a heating rate of 20° C./min., maintained at 300° C. for 3 minutes and lowered to room temperature at a cooling rate of 100° C./min., a melting point difference (Tm1−Tm3) between a melting point obtained in the first cycle (Tm1) and a melting point obtained in the third cycle (Tm3) is 0-50° C., and a tensile strength at break is 15-100 MPa.
摘要:
A polyester laminated film with excellent sealing ability is provided. The polyester laminated film comprises a base film of a polyester resin and a sealing film of a polyester composition, said sealing film being disposed on at least one side of said base film, wherein the sealing energy, which is measured when two pieces of said laminated films are joined together with the respective sealing films facing each other, is 300 g.cm/15 mm or more.