摘要:
A biaxially oriented polyester film, (A) which is formed from polyethylene-2,6-naphthalenedicarboxylate containing 0.01 to 1% by weight of inert solid fine particles having an average particle size of 0.05 to 3 .mu.m, (B) which has a refractive index, in a film thickness direction, of at least 1.498, and (C) which has a Young's modulus, at least in one direction, of at least 700 kg/mm.sup.2 ; and a process for the production thereof. This film is useful as a magnetic recording medium, particularly as a base film excellent in abrasion resistance and tear resistance.
摘要:
A magnetic recording tape, in particular a VTR tape, comprising;(A) a substrate composed of a biaxially oriented polyethylene-2,6-naphthalate film of which(a) the Young' modulus in the longitudinal direction is at least 650 kg/mm.sup.2, the Young' modulus in a transverse direction is the same as, or greater than, the Young's modulus in the longitudinal direction,(b) the heat shrinkage in the transverse direction is in the range of 1.0 to 3.0% when treated at 100.degree. C. for 30 minutes,(c) the surface roughness, Ra, is not more than 0.005 .mu.m, and(d) the amount of bled-out oligomer is not more than 0.01 area % when treated in air at 160.degree. C. for 5 minutes,(B) a thin magnetic metal layer having a thickness of 100 to 1,500 nm and formed on one surface of the substrate, and(C) a lubricant-containing thin organic polymer layer having a thickness of not more than 1 .mu.m and formed on the other surface of the substrate, said lubricant being in the form of particles which have an average particle diameter of 0.1 to 2.0 .mu.m. This magnetic recording tape has high coercive force and excellent running durability and is capable of recording data at high density and high sensitivity for a long period of time.
摘要:
A biaxially oriented polyethylene-2,6-naphthalenedicarboxylate film, which can be used as a base film for a recording medium capable of high-density recording, characterized in that when h (unit: nm) stands for a height of a protrusion formed on the film surface, the numbers of protrusions in the range of 1.ltoreq.h
摘要:
A biaxially oriented polyester film which has excellent resistances to dry heat deterioration and wet heat deterioration, which can withstand the use in an atmosphere of relatively high moisture content, and which is useful, for example, as an electrical insulating film, a film for transparent electrode, a film for absorption of electromagnetic wave (e.g. a film used as an inspection window of microwave oven) and a reflection film. This polyester contains �ethylene-2,6-naphthalenedicarboxylate as the main recurring unit.! 99.5 to 95 mole % of ethylene-2,6-naphthalenedicarboxylate and 0.5 to 5 mole % of ethylene-2,7-naphthalenedicarboxylate and has a density of 1.355 to 1.370 g/cm.sup.3 and an intrinsic viscosity of 0.62 to 0.90. The polyester film has an amount of terminal carboxyl in the polyester of 40 eg/10.sup.6 g or less and an amount of oligomers of 2.0 mg/m.sup.2 film or less.
摘要翻译:一种双轴取向聚酯薄膜,其具有优异的干热劣化和湿热劣化性,其可以承受在较高含水量的气氛中的使用,并且其可用于例如电绝缘膜,透明膜 电极,用于吸收电磁波的膜(例如用作微波炉的检查窗的膜)和反射膜。 该聚酯含有[乙烯-2,6-萘二甲酸酯作为主要重复单元] 99.5-95摩尔%的乙烯-2,6-萘二羧酸酯和0.5-5摩尔%的乙烯-2,7-萘二甲酸酯,并且具有 1.355〜1.370g / cm 3,特性粘度为0.62〜0.90。 聚酯薄膜的聚酯中的末端羧基的量为40,例如/ 106g以下,低聚物的量为2.0mg / m 2以下。
摘要:
Provided is a biaxially oriented, unidirectionally long polyethylene-2,6-naphthalenedicarboxylate film having the following characteristic properties;(A) both the Young's modulus in the longitudinal direction and the Young's modulus in the transverse direction are at least 600 kg/mm.sup.2, and the Young's modulus in the longitudinal direction is greater than the Young's modulus in the transverse direction,(B) the heat shrinkage factor in the transverse direction when the film has been treated under no load at 105.degree. C. for 30 minutes is at least 1%, and(C) the surface roughness Ra of one surface of the film is up to 5 nm, anda magnetic recording tape obtained by forming a thin magnetic metal film on the above film undergoes no curling, has high coercive force, has excellent electromagnetic conversion characteristic and permits high-density recording for a long period of time.
摘要:
An oriented polyester film (A) which comprises modified polyethylene-2,6-naphthalenedicarboxylate containing a 4,4'-diphenyldicarboxylic acid component and having a heat of crystallization of 16 to 25.5 Joule/g, and (B) which is biaxially oriented; and an oriented polyester film (A') which comprises modified polyethylene-2,6-naphthalenedicarboxylate containing of a glycol component derived from a compound represented by the following formula, ##STR1## wherein each of n and m is independently a positive number of 1 to 9 as an average, provided that m+n equals 2 to 9 as an average, and having a heat of crystallization of 6 to 20 Joule/g, and (B) which is biaxially oriented. These films are useful as a base film for a magnetic recording tape or as an electric insulation film.
摘要:
A biaxially oriented polyethylene-2,6-naphthalate film suitable for producing magnetic recording media wherein the film has a Young's modulus of at least 550 kg/mm.sup.2 in the longitudinal direction and a Young's modulus of at least 800 kg/mm.sup.2 in the transverse direction with the Young's modulus in the transverse direction being greater than the Young's modulus in the longitudinal direction by more than 200 kg/mm.sup.2 ; a surface roughness Ra of 1-12 nm; and low heat shrinkage. The film also contains 0.005-2% by weight inorganic or organic fine particles.
摘要:
Provided is a biaxially oriented, unidirectionally long polyethylene-2,6-naphthalenedicarboxylate film having the following characteristic properties; (A) both the Young's modulus in the longitudinal direction and the Young's modulus in the transverse direction are at least 600 kg/mm.sup.2, and the Young's modulus in the longitudinal direction is greater than the Young's modulus in the transverse direction, (B) the heat shrinkage factor in the transverse direction when the film has been treated under no load at 105.degree. C. for 30 minutes is at least 1%, and (C) the surface roughness Ra of one surface of the film is up to 5 nm, and a magnetic recording tape obtained by forming a thin magnetic metal film on the above film undergoes no curling, has high coercive force, has excellent electromagnetic conversion characteristic and permits high-density recording for a long period of time.
摘要:
A biaxially oriented, unidirectionally long polyethylene-2,6-naphthalate film,(A) which contains(a) 0.05 to 0.4% by weight of first inert solid particles having an average particle diameter of 0.05 to 0.3 .mu.m, and(b) 0.005 to 0.05% by weight of second inert solid particles having an average particle diameter of 0.3 to 1.0 .mu.m, this average particle diameter being greater than the average particle diameter of the first inert solid particles by at least 0.2 .mu.m, wherein:(B) the Young's modulus in the length direction is at least 650 kg/mm.sup.2, the Young's modulus in the width direction is at least 600 kg/mm.sup.2, the Young's modulus in the length direction is greater than the Young's modulus in the width direction,(C) the heat shrinkage factor in the length direction in heat treatment at 70.degree. C. for 1 hour under no load is not more than 0.08%, and(D) the surface roughness, Ra, is 3 to 10 nm; and a magnetic tape obtained therefrom.
摘要:
An oriented polyester film (A) which comprises modified polyethylene-2,6-naphthalenedicarboxylate containing a 4,4'-diphenyldicarboxylic acid component and having a heat of crystallization of 16 to 25.5 Joule/g, and (B) which is biaxially oriented; and an oriented polyester film (A') which comprises modified polyethylene-2,6-naphthalenedicarboxylate containing of a glycol component derived from a compound represented by the following formula, ##STR1## wherein each of n and m is independently a positive number of 1 to 9 as an average, provided that m+n equals 2 to 9 as an average and having a heat of crystallization of 6 to 20 Joule/g, and (B) which is biaxially oriented. These films are useful as a base film for a magnetic recording tape or as an electric insulation film.