JPH0455110B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a linear polyester resin matte film having a composition layer of a polyarylate resin, a polyamide resin, and a linear polyester resin on one or both sides. The matte film of the present invention can be used as a tracing film for drafting, a second original, a label, a release film, a stamping foil, an electrical insulation film, a leader tape for magnetic tape, and the like. (Prior art) Regarding matte films, there is generally a so-called sandblasting method in which hard particles are sprayed onto the film surface to roughen the surface, a method in which the film surface is coated with a resin containing inorganic particles, and a method in which SiO2 is added to the film resin. ₂ , there are methods to knead inorganic particles such as TiO ₂ in advance, and chemical etching methods that erode the film surface with acids or solvents. Surface roughening of polyester films is also mainly done by sandblasting or coating methods. This is currently being implemented. On the other hand, methods of roughening the surface by adding organic synthetic resins are also being considered; for example,
Publication No. 12368 includes an example of a combination of a linear polyester resin, polycarbonate, and two or more other polymers, and Japanese Patent Publication No. 1982-28096 describes a combination of a linear polyester resin and a phenoxy resin. Examples are given. Also, special public service in 1988
-28097, an example of a combination of a linear polyester resin and a polyarylate resin, and JP-A-28097,
54-7476 describes an example of a combination of polyarylate, nylon and polyester. However, these methods require high amounts of additive resin to achieve surface roughening, resulting in high costs, poor transparency, and poor mechanical performance, and have not been put to practical use. is the reality. (Problems to be Solved by the Invention) As a result of extensive research into this problem, the present inventors roughened only the surfaces that needed to be roughened, and the other parts were made using only linear polyester resin. It has been found that since the polyarylate resin and the polyamide resin are comprised of only a small amount of total addition, the cost can be dramatically reduced. In addition, normally when polyarylate resin and polyamide resin are added, interfacial reflection occurs due to the difference in refractive index, resulting in poor transparency, but in the case of the matte film of the present invention, organic additives are contained only in the surface layer, so transparency is reduced. It was found that the decline in (Means for Solving the Problems) The polyarylate resin described in the present invention is a copolymerized polyester consisting of terephthalic acid, isophthalic acid, and bisphenols, and its manufacturing method uses organic solvents that are incompatible with water. A method of interfacial polymerization of dissolved dichloride of terephthalic acid and isophthalic acid with bisphenols dissolved in an alkaline aqueous solution, a method of polymerizing dichloride of terephthalic acid and isophthalic acid and bisphenols in an organic solvent, terephthalic acid and isophthalic acid and bisphenols in the presence of acetic anhydride; a method of heating and melt polymerizing phenyl esters of terephthalic acid and isophthalic acid and bisphenols; There are methods such as heating and melt polymerization in the presence of
It is not particularly limited to these. The polyamide resin used in the present invention is a thermoplastic linear polyamide resin having an amide bond in its molecular chain, namely nylon 6, nylon 66, nylon
610, nylon 12, nylon 46, a polymer of metaxylylene diamine and an aliphatic dicarboxylic acid, and a copolyamide and modified polyamide consisting of the above polyamide-forming monomer, or a mixture thereof. Furthermore, the linear polyester resin described in the present invention is a polycondensate of an acid component such as terephthalic acid, isophthalic acid, or paraoxybenzoic acid and a diol component such as ethylene glycol or tetramethylene glycol, and is a polycondensate of two or more of these components. A mixture may also be used. Typical examples include polyethylene terephthalate and polybutylene terephthalate, which are good in terms of performance and price. In addition, by adding a crosslinking agent or providing crosslinkable branches, heat treatment can be applied before or after stretching.
Crosslinking with light or radiation is also within the scope of the present invention. The polyarylate resin, polyamide resin, and linear polyester resin can be kneaded using a conventional single-screw or twin-screw extruder, but the method is not particularly limited to this. Further, the method of laminating the organic additive resin-containing layer is not particularly limited, but coextrusion, extrusion lamination, dry lamination, hot melt coating, etc. are effective methods in consideration of operability and productivity. In addition, in any layer of the matte film of the present invention,
It is also possible to add slip property improvers, heat stabilizers, etc. to the extent that physical properties are not impaired. The laminated unstretched films have smooth surfaces and cannot be used as matte films as they are, but the surfaces are roughened by being stretched. The stretching ratio needs to be 1.5 times or more, preferably 2 times or more in at least one direction. In addition, in order to obtain a film with good balance between length and width, it is necessary to carry out biaxial stretching of 1.5 times or more, preferably 2 times or more, in the length and width directions. The stretching temperature is preferably 80°C to 120°C. Moreover, in the case of biaxial stretching, sequential two-stage stretching or simultaneous biaxial stretching may be used. The heat setting temperature after stretching is preferably 220°C or higher. That is, 3 to 35 parts of a polyarylate resin consisting of terephthalic acid and isophthalic acid (however, the molar ratio of terephthalic acid groups to isophthalic acid groups is 9:1 to 1:9) and a divalent phenolic compound;
A composition layer containing 3 to 35 parts of polyamide resin and 94 to 55 parts of linear polyester resin is laminated on one or both sides of the linear polyester resin layer, and is stretched 1.5 times or more in at least one direction. This is a characteristic pine film. (Example) Hereinafter, it will be explained in detail using an example. Comparative Examples 1 and 2 and Examples 1 to 7 Polyarylate resin was produced by interfacial polymerization of a methylene chloride solution of mixed acid chloride with a ratio of terephthalic acid dichloride/isophthalic acid dichloride of 5:5 and bisphenol A dissolved in an aqueous alkaline solution. Manufactured. This polyarylate resin, nylon 6 resin, and polyethylene terephthalate resin were heated and mixed in a twin-screw extruder while changing the mixing ratio to form chips. Next, these chips were separately processed using a 60mm extruder for 280 mm.
℃, and coextruded from a T-die in a separate 60 mm extruder so that both outer layers of polyethylene terephthalate resin were melted at 280°C. The thickness of the laminated film was 50μ/400μ/50μ, respectively. These unstretched films are heated to 90℃ using a roll-type longitudinal stretching machine.
The film was stretched 2.0 times in the longitudinal direction. film stretchability,
The pencil, ink writing characteristics, and mechanical characteristics were investigated and the results are shown in Table 1.

[Table] Example 8 The laminated unstretched film used in Example 4 was stretched 3.3 times in the longitudinal direction at 90°C using a roll longitudinal stretching machine.
Subsequently, the film was stretched 3.5 times in the transverse direction using a tenter type transverse stretching machine at 100°C, and immediately heat set at 230°C. The resulting biaxially stretched film was examined for its writability, erasing and rewriting properties, copyability, etc., and as shown in Table 2, it was good with both pencil and ink. The mechanical properties of the film were also good as shown in Table 3.

【table】

[Table] (Effects of the invention) Since the pine film of the present invention contains polyarylate resin and polyamide resin only in the surface layer, the mechanical performance maintains the value of ordinary polyester film, and the dimensional stability , heat resistance is also good. In addition, since it is stretched while being supported by the linear polyester layer, it is difficult to cut compared to a single layer, and a larger amount of organic additives can be added to the surface matte layer than in the case of a single layer, which improves matte properties. An excellent film can be obtained. As mentioned above, the pine film of the present invention has dramatically improved price, transparency, mechanical properties, mattability, stretchability, etc. compared to the single-layer pine film described in the above-mentioned Japanese Patent Application Laid-Open No. 54-7476. It is suitable for practical use.

Claims (1)

[Claims] 1 3 to 35 parts of a polyarylate resin consisting of terephthalic acid and isophthalic acid (however, the molar ratio of terephthalic acid groups to isophthalic acid groups is 9:1 to 1:9) and a divalent phenolic compound, 3 to 35 parts of polyamide resin 35 parts and linear polyester resin 94-55
1. A pine film, characterized in that a composition layer containing a polyester resin is laminated on one or both sides of a linear polyester resin layer, and is stretched 1.5 times or more in at least one direction.