JP2019203121A5 - Polyester film for thermal stencil and master for thermal stencil - Google Patents

Claims (10)

When the melting point (Tm) in the temperature raising process of differential scanning calorimetry (DSC) is 175 ° C or higher and 225 ° C or lower, and the cold crystallization temperature (Tmc) in the temperature lowering process of differential scanning calorimetry (DSC) is 145 ° C or higher and 165 ° C. There is a polyester film for heat-sensitive stencil. The content of the alkali metal element in the polyester film is M1 (mol / t), the content of the divalent metal element is M2 (mol / t), the content of the trivalent metal element is M3 (mol / t), and phosphorus. The heat sensitive according to claim 1, wherein when the element content is P (mol / t), the metal amount M (mol / t) in the polyester film obtained by the following formula (i) satisfies the following formula (ii). Polyester film for stencil.
(I) M = 0.5 × (M1) + M2 + 1.5 × (M3)
(Ii) 1.4 ≤ M / P ≤ 3.0 The heat-sensitive slab according to claim 1 or 2, wherein the difference (ΔTcg) between the glass transition temperature (Tg) and the crystallization temperature (Tc) in the heating process of the differential scanning calorimetry (DSC) is 40 ° C. or higher and 70 ° C. or lower. For polyester film. The polyester film for thermal stencil according to any one of claims 1 to 3, wherein the intrinsic viscosity (IV) is 0.60 dl / g or more and less than 0.80 dl / g. _{Claims 1 to 4 in which the shrinkage stresses N (TD)} N / mm ² and N _(MD) N / mm ^{2 at} 65 ° C. in the film width direction (TD) and the film longitudinal direction (MD) satisfy the following equations. The polyester film for heat-sensitive stencil according to any one of.
4.0 N / mm ² ≤ (N _(TD) + N _(MD) ) ^{/ 2 ≤ 8.0 N / mm 2} Claims 1 to 5 include, as a diol component, at least two selected from ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 1,4-cyclohexylene dimethanol. The polyester film for heat-sensitive stencil according to any one of. The invention according to any one of claims 1 to 6, wherein the dicarboxylic acid component comprises at least two selected from terephthalic acid, isophthalic acid, adipic acid, 1,4-cyclohexanedicarboxylic acid, and 2,6-naphthalenedicarboxylic acid. Polyester film for heat-sensitive stencil. The polyester film for a thermal stencil according to any one of claims 1 to 7, which is biaxially oriented. A method for manufacturing a polyester film for thermal stencil.
Including the process of melting and mixing two or more types of polyester resins and then molding them into a film.
At least 2 selected from ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 1,4-cyclohexylene dimethanol as the diol constituents of the two or more kinds of polyester resins. Including seeds
The dicarboxylic acid constituents of the two or more types of polyester resins include at least two selected from terephthalic acid, isophthalic acid, adipic acid, 1,4-cyclohexanedicarboxylic acid, and 2,6-naphthalenedicarboxylic acid.
A method for producing a polyester film for thermal stencil, wherein the kneading temperature of the melt kneading is 260 ° C. or higher and 300 ° C. or lower, and the kneading time is 5 minutes or longer and 60 minutes or lower. A master for heat-sensitive stencil plates, which is a laminate obtained by laminating the polyester film for heat-sensitive stencil plates according to any one of claims 1 to 8 on Japanese paper.