JPH07195640A - Laminated polyester film and vapor deposition film - Google Patents

Abstract

PURPOSE:To eliminate surface irregularity by providing a primer layer based on copolyester having a specific compsn., a specific acrylic resin and fine particles of a lubricant on the single surface or both surfaces of a polyester film. CONSTITUTION:A laminated polyester film is formed by laminating a primer layer based on copolyester characterized by that a glass transition point is 40-80 deg.C and a dicarboxylic acid component having an -SO3M group (wherein M is a metal atom having the same equavalent as -SO3, an ammonium group, a quaternary amine group or a quaternary phosphonium group) occupies 80-20mol% of the total dicarboxylic acid component, an acrylic resin with a glass transition point of 25-70 deg.C and fine particles of a lubricant on the single surface or both surfaces of a polyester film. Further, a metal vapor film is applied to the primer layer to form a vapor deposition film. Other resin, a surfactant or an antistatic agent can be compounded with the primer layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a laminated polyester film, and more specifically, it has a uniform primer layer excellent in adhesion to a metal such as aluminum and is suitably used as a base film of a vapor deposition film. The present invention relates to a film and a vapor deposition film having the laminated polyester film as a base film.

[0002]

It is known to produce vapor-deposited films with a polyester film as the base film.
A primer layer is applied to this polyester base film for the purpose of imparting adhesiveness to a metal such as aluminum. This primer layer is required to have adhesiveness with a metal and uniformity without unevenness on the surface.

[0003]

The object of the present invention is that it has excellent adhesion to a metal such as aluminum, has a uniform and even primer layer over the entire surface, and is suitable for use as a base film for a vapor deposition film. It is to provide a laminated polyester film which can be obtained. Another object of the present invention is to provide a vapor deposition film using the above laminated polyester film as a base film.

[0004]

In order to achieve the above object, according to the present invention, firstly, (A) the glass transition point is 40 to 80 ° C. on one side or both sides of the polyester film.
And a dicarboxylic acid component having a group —SO ₃ M (where M represents a metal atom, an ammonium group, a quaternary amine or a quaternary phosphonium group in the same amount as —SO ₃ ) is a total dicarboxylic acid component. Copolymerized polyester occupying 8 to 20 mol%, (B) an acrylic resin having a glass transition point of 25 to 70 ° C., and (C) a primer layer mainly composed of fine particles as a lubricant are characterized by being present. A laminated polyester film is provided. Further, according to the present invention, secondly, there is provided a vapor deposition film characterized in that a metal vapor deposition film is present on the primer layer of the laminated polyester film.

Hereinafter, the present invention will be described in detail, by which other objects, constitutions and advantages and effects of the present invention will be apparent.

In the present invention, preferred examples of the polyester of the polyester film provided with the primer layer include polyethylene terephthalate and polyethylene-2,
Mention may be made of 6-naphthalene dicarboxylate. Other examples include polybutylene-2,6-naphthalenedicarboxylate, terephthalic acid-2,6-naphthalenedicarboxylic acid-ethylene glycol copolymerized polyester, terephthalic acid-2,6-naphthalenedicarboxylic acid-1,4-butanediol. Mention may be made of ethylene glycol copolyesters.

The intrinsic viscosity of the above polyester (orthochlorophenol solvent, measured at 35 ° C.) is 0.4 to 0.9 dl.
/ G is preferable.

In the present invention, a primer layer is present on one side or both sides of the polyester film. This primer layer is composed of (A) copolymerized polyether,
The main components are (B) acrylic resin and (C) fine particles as a lubricant.

The above-mentioned copolyester has the group --SO ₃ M
(Where M represents a metal atom, an ammonium group, a quaternary amine or a quaternary phosphonium group in the same amount as —SO ₃ ) and the dicarboxylic acid component is 8% of the total dicarboxylic acid component.
-20 mol%, preferably 9-16 mol%. When the content of the group —SO ₃ M is within the above range, the laminated polyester film of the present invention has excellent adhesiveness.

In the above group --SO ₃ M, M is preferably an alkali metal atom such as lithium, sodium and potassium, an alkaline earth metal atom such as magnesium and calcium, and particularly preferably sodium and potassium.
Further, M is also preferably an ammonium group, a tetraethylammonium group, or a tetrabutylphosphonium group.

The dicarboxylic acid component containing the group --SO ₃ M is represented by the following formulas (1) to (5)

[Chemical 1]

Examples thereof include compounds represented by: These may be contained in the copolyester alone or in combination of two or more.

Other dicarboxylic acid components constituting the copolyester include terephthalic acid, phthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, diphenylketone dicarboxylic acid, 4,4'-diphenyldicarboxylic acid and anthracene. Examples thereof include aromatic dicarboxylic acids such as dicarboxylic acids, aliphatic dicarboxylic acids such as adipic acid and sebacic acid, alicyclic dicarboxylic acids such as cyclohexane-1,4-dicarboxylic acid, and other dimer acids. Two or more of these may be contained in the copolyester (a). The copolyester (a) may further contain maleic acid, fumaric acid, itaconic acid, etc. together with the above dicarboxylic acid as an acid component.

As the glycol component constituting the copolyester, ethylene glycol, trimethylene glycol, tetramethylene glycol (1,4-butanediol), pentamethylene glycol, neopentylene glycol, hexamethylene glycol, decamethylene glycol, etc. C2-C10 alkylene glycol, alicyclic diol such as cyclohexanedimethanol, dialkylene glycol such as diethylene glycol dipropylene glycol, hydroquinone, resorcin, 2,2-bis (4-hydroxyphenyl) propane, 1,4- Aromatic ring-containing diols such as dihydroxydimethylbenzene, polyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Lumpur (polyoxyalkylene glycol), other bisphenol A / alkylene oxide adduct, and the like hydroquinone / alkylene oxide adducts.

The copolymerized polyester may contain a small amount of a hydroxycarboxylic acid component such as p-hydroxybenzoic acid and p- (β-hydroxyethoxy) benzoic acid, in addition to the above-mentioned dicarboxylic acid component and glycol component.

Further, the copolyester may contain a polyfunctional component in addition to the above-mentioned dicarboxylic acid component, glycol component and hydroxycarboxylic acid component, in a small amount in a range in which crosslinking does not substantially occur. Examples of the polyfunctional component include trimellitic acid, dimethylolpropionic acid, glycerin, and trimethylolpropane.

The number average molecular weight of the copolyester is 40.
It is preferably from 00 to 27,000.

The glass transition point of the copolyester is 40 to 80 ° C, preferably 45 to 75 ° C.
When the glass transition point of the copolyester is within the above range, the laminated polyester film of the present invention has excellent blocking properties and can maintain transparency.

Such copolymerized polyester (a) can be produced by a method known per se. For example, it can be easily obtained by subjecting the above-mentioned dicarboxylic acid containing the group —SO ₃ M, other dicarboxylic acid and glycol as a starting material to an esterification reaction or an ester exchange reaction followed by a polycondensation reaction. The copolyester having a desired glass transition point can be easily manufactured based on the knowledge, since the relationship between the acid component composition and the glycol component composition and the glass transition point can be known in advance by a preliminary experiment.

The glass transition point of the acrylic resin (B) constituting the primer layer is 25 to 70 ° C., preferably 40.
~ 66 ° C. When the glass transition point is within the above range, the laminated film of the present invention is excellent in adhesiveness and can maintain blocking resistance and transparency.

Examples of the acrylic resin include methyl methacrylate, ethyl acrylate, butyl acrylate, acrylic acid, methacrylic acid, acrylamide, N-methylol acrylamide, glycidyl methacrylate, acrylonitrile, β-hydroxyethyl acrylate and ammonium acrylate. Examples thereof include polymers or copolymers of acrylic monomers, and further copolymers of the above-mentioned monomers and a small proportion of vinyl monomers exemplified by styrene. The acrylic resin is non-crosslinked.

The acrylic resin is preferably water-soluble because it is easy to prepare the primer coating liquid as an aqueous coating liquid.

The fine particles as the (C) lubricant in the present invention preferably have an average particle size of 0.01 to 1 μm. Organic fine particles exemplified by crosslinked acrylic resin, crosslinked polystyrene resin and crosslinked melamine resin; and inorganic fine particles exemplified by silicon oxide, titanium oxide, talc, kaolin, aluminum oxide, carbon and silicon carbide in the present invention. (C) It can be used as fine particles.

The proportions of the (A) copolymerized polyester, the (B) acrylic resin and the (C) fine particles are 20 to 80% by weight of the copolymerized polyester and 10 to 50% of the acrylic resin based on the total amount thereof. % By weight, 5 to 5
It is preferably 25% by weight. Within the above range, the laminated polyester film of the present invention can have excellent adhesiveness, and the slipperiness and transparency can be maintained.

The primer layer of the laminated polyester film of the present invention comprises, in addition to the above-mentioned components, other resins, surfactants, antistatic agents, slipperiness-imparting agents and ultraviolet absorbers within the range not impairing the achievement of the object of the present invention. Can be included.

The thickness of the laminated polyester film of the present invention is preferably 10 to 150 μm, and the thickness of the primer layer is preferably 0.01 to 0.3 μm.
The laminated polyester film may have a two-layer structure or a three-layer structure.

To provide a primer layer on a polyester film, usually an aqueous dispersion (coating liquid) in which a copolyester and an acrylic resin are dissolved or dispersed and fine particles are dispersed is applied to one or both sides of the polyester film, It can be performed by drying.

The primer layer thus formed has a uniform surface and is free from spots. Moreover, since the adhesive strength to metals, especially aluminum, is high, the laminated polyester film of the present invention is excellent as a base film for vapor deposited films.

The polyester film before coating may be a non-oriented film, a uniaxially oriented film or a biaxially oriented film, but it may be applied to the uniaxially oriented film, and after drying or while being dried, further stretched and heat treated to form a biaxially oriented film. Is preferred. As the coating method, any method known per se such as roll coating can be used.

A vapor-deposited film can be easily obtained by providing a vapor-deposited layer of aluminum or the like on the primer layer side of the laminated polyester film of the present invention by a vapor deposition method.

[0031]

The present invention will be described in more detail based on the following examples. Each characteristic value was measured by the following method.

(1) Coating unevenness Aluminum is vapor-deposited on the primer-coated surface and the unevenness is visually observed. A: No spots B: Very slight spots C: Spots are clearly visible

(2) Adhesive strength Aluminum is vapor-deposited on the primer-coated surface and the peeling test of aluminum is examined for the ease of peeling of aluminum.

[Example 1] Intrinsic viscosity of 0.62 dl / g
An unstretched film of polyethylene terephthalate (measured in an orthochlorophenol solvent at 35 ° C.) was stretched 3.5 times in the machine direction, and then terephthalic acid-isophthalic acid-5
-Na sulfoisophthalic acid (compound of the above chemical formula (1): occupies 13 mol% of all dicarboxylic acid components) -ethylene glycol-neopenpentylene glycol copolymerization P
(Tg = 49 ° C.) 56 parts by weight, methyl methacrylate-
Ethyl acrylate-acrylic acid-methacrylamide-N
-Methylol acrylamide copolymer S (Tg = 42
25 parts by weight, crosslinked acrylic resin filler (40 m
A 4% concentration aqueous solution (coating solution) containing 10 parts by weight (m diameter) and 9 parts by weight of an ethylene oxide / propylene oxide copolymer (coating solution) was applied to one side of the above film with a roll coater. While being dried, it was stretched 4 times in the transverse direction and heat-set at 220 ° C. to obtain a 25 μm film. The film thickness of the primer was 0.05 μm. The characteristics of this film are shown in Table 1.
Shown in.

[Comparative Example 1] Table 1 shows the characteristics of the film obtained by repeating Example 1 except that the primer layer was not provided.

[Examples 2 to 7] Table 1 shows the characteristics of the film obtained by repeating Example 1 except that the primer composition and the film thickness were changed as described in Table 1.

Copolymerized polyester Q and acrylic resin T in Table 1 are as follows. Polyester Q 2,6-naphthalenedicarboxylic acid-isophthalic acid-5-
Potassium sulfoisophthalic acid (compound of formula (2):
(According to 11 mol% of all dicarboxylic acids) -Ethylene glycol-bisphenol A / ethylene oxide adduct copolymer (Tg = 55 ° C.) Acrylic resin T Methyl methacrylate-glycidyl methacrylate-butyl acrylate-N-methoxymethylacrylamide-β
-Hydroxyethyl methacrylate copolymer (Tg = 4
8 ° C)

[0038]

[Table 1]

[0039]

According to the present invention, it is possible to obtain a laminated polyester film having a primer layer which is excellent in adhesion to a metal, particularly aluminum, and which has a uniform and even primer layer over the entire surface. This film is excellent as a base film for vapor deposition.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // C08G 63/688 NNK

Claims (2)

[Claims] 1. A polyester film having (A) a glass transition point of 40 to 80 ° C. on one side or both sides thereof, and a group —S.
The dicarboxylic acid component having O ₃ M (where M represents a metal atom, an ammonium group, a quaternary amine or a quaternary phosphonium group in the same amount as —SO ₃ ) is 8 to 20 mol of the total dicarboxylic acid component. Copolymerized polyester, which accounts for
A laminated polyester film comprising (B) an acrylic resin having a glass transition point of 25 to 70 ° C. and (C) a primer layer containing fine particles as a lubricant as main components. 2. A vapor-deposited film, wherein a metal vapor-deposition film is present on the primer layer of the laminated polyester film according to claim 1.