Abstract: A polyester film for metal sheet lamination processing which comprises a co-polyester containing a lubricant having an average particle diameter of 2.5 .mu.m or less and the co-polyester having a melting point of 210.degree. to 245.degree. C.; and wherein the refractive index in the direction of film thickness is 1.505 to 1.550, the refractive index in the direction of the film plane is 1.61 to 1.66 about all directions, subpeak by DSC is 150.degree. to 205.degree. C., and optionally, protrusions on the film surface satisfy the formula0.1.ltoreq.Nd/N.ltoreq.0.5wherein N is the number of all the protrusions on the film surface and Nd is the number of the protrusions each containing the lubricant as its nucleus and having a sunk hollow around it.

Abstract: A biaxially oriented polyester film comprising a copolyester which contains a lubricant having an average particle diameter of no greater than 2.5 .mu.m and has a melting point of from 210.degree. to 245.degree. C., the film having a plane orientation coefficient of from 0.10 to 0.16, a thermal shrinkage at 150.degree. C. of no higher than 10%, and a density of lower than 1.385 g/cm.sup.3, and optionally a refractive index in a direction of thickness of from 1.495 to 1.530 as well as a film plane refractive index of from 1.61 to 1.66 in all directions.

Abstract: A stamping foil comprising:(a) a biaxially oriented polyester film containing as a first component from 0.01 to 0.5% by weight of spherical silica particles having an average particle diameter of from 0.03 .mu.m and smaller 0.3 .mu.m and a particle diameter ratio defined as a ratio of long diameter/short diameter of from 1.0 to 1.2, and as a second component from 0.002 to 0.2% by weight of spherical silica particles having an average particle diameter of from 0.6 to 3 .mu.m and a particle diameter ratio defined as a ratio of long diameter/short diameter of from 1.0 to 1.2, provided that the content of said second component is the same as or less than the content of said first component,(b) a release layer provided on one surface of said biaxially oriented polyester film (a), and(c) a cover layer provided on siad release layer (b).

Abstract: A biaxially oriented polyester film formed from an intimate mixture comprising (1) an aromatic polyester, and (2) 0.01 to 4% by weight, based on the aromatic polyester, of spherical fine particles of silica having (a) an average particle diameter of 0.05 to 4 .mu.m, (b) a particle diameter ratio, defined by the ratio of maximum diameter of minimum diameter, of from 1.0 to 1.2, and (c) a relative standard deviation (.sigma.) of particle size, of up to 0.5. A biaxially oriented polyester film formed from an intimate mixture comprising (1) an aromatic polyester, (2) 0.005 to 3% by weight, based on the aromatic polyester, of spherical fine particles of silica having the same properties as the above-mentioned (a), (b) and (c), and (3) 0.005 to 3% by weight, based on the aromatic polyester, of inert fine particles having an average particle diameter of 0.01 to 3 .mu.m and not exceeding the average particle diameter of the spherical fine particles of silica.

Abstract: A biaxially oriented film formed from a intimate mixture comprising (I) an aromatic polyester, (II) 0.005 to 1.0% by weight, based on the aromatic polyester, of fine particles of a silicone resin having (a) a composition represented by the following formula (A)R.sub.x SiO.sub.2-x/2 (A)wherein R represents a hydrocarbon group having 1 to 7 carbon atoms, and x is a number of from 1 to 1.2, (b) a volume shape factor (f), represented by the following formula (B), of more than 0.4 but not exceeding .pi./6f=V/D.sup.3 (B)wherein V is the average volume (.mu.m.sup.3) of the particles and D is the average maximum particle diameter (.mu.m) of the particle, and (c) an average particle diameter of 0.3 to 4 .mu.m. The film optionally contains (III) 0.005 to 1% by weight, based on the aromatic polyester, of inert fine particles having an average particle diameter of 0.01 to 1 .mu.m but being smaller than the average particle diameter of the silicone resin particles.

Abstract: A biaxially oriented polyester film for use in thin metallic film-type magnetic recording media, said polyester film having a first surface to which a thin metallic film as a magnetic recording layer is to be applied and a second surface coated with an easily slippable layer composed of an organic polymeric binder and inert fine solid particles dispersed therein, the first surface having (a) large protrusions with a diameter of 0.2 to 2 micrometers and a height of 20 to 200 angstrom distributed at a density of at least 10.sup.3 but less than 10.sup.6 per mm.sup.2, and (b) small protrusions with a diameter of 0.01 to 0.1 micrometer and a height of 10 to 100 angstrom distributed at a density of from 10.sup.6 up to 10.sup.9.

Abstract: A magnetic recording flexible disc composed of a polyester film substrate having formed thereon a magnetic layer, the improvement wherein said polyester film is a biaxially oriented film consisting of poly-1,4-cyclohexylene dimethylene terephthalate wherein at least 90 mole % of a glycol component is 1,4-cyclohexanedimethanol and at least 80 mole % of an acid component is terephthalic acid, a maximum value of a temperature dependent expansion in the surface direction of the film is 9.times.10.sup.-6 to 35.times.10.sup.-6 /.degree.C., a maximum value of a humidity dependent expansion in the surface direction of the film is 0 to 8.0.times.10.sup.-6 /% RH, the difference between the maximum and minimum values of the temperature dependent expansion in the surface direction of the film is 0 to 8.0.times.10.sup.-6 /.degree.C., and the difference between the maximum and minimum values of the humidity dependent expansion in the surface direction of the film is 0 to 3.0.times.10.sup.-6 /% RH.

Abstract: A greenhouse constructed by stretching over a framework a polyethylene terephthalate film oriented in at least one direction and having a refractive index in the oriented direction of 1.57 to 1.78, a refractive index in the thickness direction of 1.48 to 1.57, a density of 1.340 to 1.390 g/cm.sup.3, and a thickness of 50 to 500 microns, as a material for protecting plants from weather exposure.

Abstract: A printed polyester film comprising(I) a biaxially oriented polyester film containing more than 2% by weight to 10% by weight of polyethylene glycol having a molecular weight of 5,000 to 200,000 and a density of 1.390 to 1.410, said film being composed of a polyester in which at least 80% by weight of the entire structural units consists of an ethylene terephthalate unit, and(II) a printed layer formed by a printing ink containing a cellulose derivative as a binder, said printed layer being applied to at least a part of the surface of the film (I),and a process for preparation thereof.

Abstract: An adhesive film having weatherability comprising (I) a polyethylene terephthalate film base being oriented in at least one direction and having a refractive index, in the orientation direction, of 1.57 to 1.78, a refractive index, in the thickness direction, of 1.48 1.57, a density of 1.340 to 1.390 g/cm.sup.3, and a thickness of 5 to 250 microns, and (II) an adhesive layer coated on at least one surface of said film base (I) either directly or through (III) a layer of a thin metallic film or an adhesive film comprising (I), (II) coated on one surface of (I), and (III) coated on the other surface of (I).