A heat shrinkable polyester film of the present invention has a transverse tear defect percentage of about 20% or less as determined in the following vibration test: the film is rolled into a tubular shape, two of its opposite edges bonded together, and then the tubular film is placed around a vertical stack (total weight: 660 g) of three food container cans each having a diameter of 72 mm and a height of 55 mm; the can stack with the tubular film placed therearound is passed through a shrink tunnel to shrink the tubular film onto the can stack; a total of 18 packs of such can stacks are placed into a cardboard box having a length of 455 mm, a width of 230 mm and a height of 165 mm (6 packs in the length direction by 3 packs in the width direction), and the cardboard box is sealed; the cardboard box is vibrated along the width direction for 30 min by a stroke of 50 mm and at a vibration rate of 180 reciprocations/min, after which the transverse tearage of the tubular film is visually observed; and the transverse tear defect percentage (%) is determined based on the number of defective packs per 18 packs, wherein the defective pack is any pack having a tear flaw of 30 mm or longer along a can periphery The heat shrinkable polyester film of the present invention has a good shock resistance during shipping especially under low temperatures, with a good finish after shrinkage and a sufficient solvent adhesiveness Thus, the heat shrinkable polyester film of the present invention is suitable for use in a multi-packaging label for packaging, inter alia, a stack of cans

Heat-shrinkable polyester film

A birefringent dielectric multilayer film that reflects in a wavelength region of interest, and preferably reflects at least 50 % of light in a band at least 100 nm wide, preferably positioned between wavelengths from about 700 nm to about 2000 nm. The film is heat set to render the film capable of shrinking to conform without substantial wrinkling to a substrate having a compound curvature. The film may be laminated to form a wide variety of non-planar articles.

Wrinkle resistant infrared reflecting film and non-planar laminate articles made therefrom

A polyester resin composition is calendered to produce a film or a sheet. The polyester resin composition is a polyester having a crystallization half time from a molten state of at least 5 minutes combined with an additive for preventing sticking of the polyester to calendering rolls.

Polyester resin compositions for calendering

Heat-shrinkable polyester films suitable for label use, wherein the value of tan δ for dynamic viscoelasticity in a main shrinkage direction of the film is 0.15 or higher at 65° C. and takes a maximum of 0.40 or higher at a temperature of 65° C. to 100° C. both inclusive, and the heat shrinkability in the main shrinkage direction of the film after treatment in hot water at 80° C. for 10 seconds is 30% or higher, have excellent shrinkage characteristics over a wide range of temperature extending from low temperatures to high temperatures, particularly in the low temperature range, which may cause only rare occurrence of shrinkage spots, wrinkles, strains, longitudinal sinking, and other defects during heat shrinkage, and which may further have excellent break resistance.

Heat-shrinkable polyester films

Polyester compositions that provide a higher throughput in calendering processes may be prepared from a polyester having crystallization half time of at least 5 minutes, an inherent viscosity of about 0.55 to about 0.75 dL/g, a branching monomer, and a release additive. The polyester compositions show a combination of excellent melt strength with good shear response that permits higher calendering line speeds before melt fracture occurs. Also disclosed are processes for film or sheet by calendering the above compositions and the film or sheet produced therefrom. The polyester compositions, film, or sheet also may include plasticizers and/or flame retardants to increase their flexibility and enable their use in commercial applications requiring flame resistance. The film and sheet have excellent appearance and can be used in a wide range of decorative and packaging applications.

Polyester compositions for calendering

A thermo-shrinkable polyester film of this invention is obtained from a composition that comprises acid components including telephthalic acid and glycol components including ethyleneglycol. The polyester film has a heat-shrinkage ratio of 30% or more in a certain direction at 100°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.

Thermo-shrinkable polyester film

A process for enhancing the adhesion of the surface of a shaped product made of a polyester composition which comprises applying corona discharge to the surface under the continuous movement between an electrode for discharge and another electrode opposite thereto while jetting a gaseous material containing oxygen in an amount of not more than 20% by volume onto the part of said surface to which corona discharge is applied so as to achieve the following relationships among oxygen indexes and nitrogen indexes before and after the application of corona discharge: -3.5≦(Oi'-Oi)/(Ni'-Ni)≦1.5 (1) 3≦Ni' (2) wherein Oi and Oi' are respectively the oxygen indexes before and after the application of corona discharge and Ni and Ni' are respectively the nitrogen indexes before and after the application of corona discharge.

Production of polyester shaped product

A transparent polyester film having excellent printability, flexing resistance and pinhole resistance and further excellent interlaminar strength, which is made from a polymer mixture or blend comprising (i) a polyester consisting essentially of a residue of dibasic acids wherein at least 80 % by mol is terephthalic acid and a residue of at least one glycol and (ii) a block copolyester consisting of a crystalline polyester (hard) segment having a high melting point and a soft polymer segment having a low melting point and a number average molecular weight of 400 to 8,000, said soft polymer segment having a low melting point being contained in an amount of 0.5 to 10 % by weight on the basis of the whole weight of the polymer mixture or blend, and said crystalline polyester segment having a melting point of at least 170° C when a polymer is produced by the monomers composing the segment alone and said soft polymer segment having a melting or softening point of 100° C or lower.

Stretched polyester film from a polymer blend

A polyester film having a coefficient of dynamic friction between the film and a metal at 80° C. of not more than 0.45, a polyester film composed of a polyester comprising an ethylene terephthalate unit in a proportion of 70% or more by mole, the polyester film comprising a cyclic ethylene terephthalate trimer in a proportion of 0.7% or less by weight, laminated metal sheets and metal containers manufactured from said laminated metal sheet. According to the present invention, the polyester film shows superior sliding property and superior scratch resistance during can production, as well as the elution of oligomer from the film can be suppressed, so that when the film is used for metal containers for food, the change in taste and smell of the food contained therein and degraded appearance of the surface of the film caused by the deposition of oligomer are avoided.

Polyester film, laminated metal sheet and metal container

A laminated film for wrapping use prepared by laminating one or both sides of a base layer composed of isotactic polybutene-1 homopolymer or copolymer with a film of propylene homopolymer or copolymer, with the base layer having a thickness of 50 % of that of the whole film, having excellent flexibility and punch hole strength and, in some cases, being oriented uniaxially.

Tsutomu Isaka

Papers

Thermo-shrinkable polyester film

Production of polyester shaped product

Stretched polyester film from a polymer blend

Polyester film, laminated metal sheet and metal container

Laminated film for wrapping use