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Mold release polyester film for simultaneous molding and transfer

A technology of molded polyester and laminated polyester film, which is applied in the field of mold release polyester film for synchronous transfer printing, can solve the problems of easy peeling, peeling of printing layer, partial peeling, etc., and achieve high industrial value, fine printing, The effect of not easy to stick

Inactive Publication Date: 2017-12-29
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resin constituting the easily bonding layer tends to use a resin with low solvent resistance in order to obtain good adhesive properties.
Therefore, when the release layer is applied, the solvent may dissolve, or the softened easy-adhesion layer may be partially peeled off by the release layer coating tool, and the adhesive strength between the release layer and the base film may decrease. topic
In addition, with regard to a film laminated with an easily bonding layer, the films tend to adhere to each other, the blocking resistance is poor, and the workability when a release layer is further provided on the film may be poor (see Patent Document 3).
[0010] On the other hand, if the releasability between the release layer and the print layer is too high, the print layer is likely to peel off from the release layer, adhere to the mold, stick, and transfer to the surface of the transfer sheet opposite to the print layer. , When peeling is not necessary in the middle of lamination processing and transfer processing of printing layers, etc., it may easily peel off

Method used

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  • Mold release polyester film for simultaneous molding and transfer
  • Mold release polyester film for simultaneous molding and transfer
  • Mold release polyester film for simultaneous molding and transfer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] (Manufacture of release polyester film)

[0126] Blend polyester II and polyester IV as shown in Table 2 below, melt them with an extruder, and supply them to the outer layer A of the lamination die, and supply polyester I to the inner layer of the lamination die as shown in Table 2 b. Two types of three-layer laminated polyester resins consisting of outer layer A / inner layer B / outer layer A were extruded into a film and cast on a cooling cylinder at 35°C to produce a quenched and solidified unstretched film. Next, after preheating with a heating roll at 80°C, and stretching 3.4 times in the longitudinal direction between the rolls at 90°C with an infrared heater and a heating roll, apply the coating solution No. 3 in Table 1. Coating solution formulated at a ratio such that the coating amount (after drying) becomes 0.030 g / m 2 . Next, hold the end of the film with clips, introduce it into a tenter, heat it at a temperature of 95°C, and stretch it 4.0 times in the tr...

Embodiment 2

[0130] Polyester II and polyester IV were blended as shown in Table 2, melted by an extruder, and supplied to the outer layer A of the laminated mold, and a release polyester film was obtained in the same manner as in Example 1. The properties of the obtained film are shown in Table 2, showing excellent properties.

Embodiment 3

[0132] Polyester II and polyester IV were blended as shown in Table 2, melted by an extruder, and supplied to the outer layer A of the laminated mold, and a release polyester film was obtained in the same manner as in Example 1. The properties of the obtained film are shown in Table 2. Although there were still problems in the evaluation of blocking properties, excellent properties were comprehensively shown.

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Abstract

Provided is a mold release polyester film for simultaneous molding and transfer, which has excellent gloss, is free from the occurrence of blocking during a processing step of a transfer sheet, and has a function that enables smooth separation at the interface between a mold release layer and a print layer, while maintaining uniform gloss of the surface of a molded article during a transfer sheet separation step after simultaneous molding and transfer. This mold release polyester film for simultaneous molding and transfer has a mold release layer on at least one surface of a multilayer polyester film which is composed of at least three layers, and wherein inert particles contained in both outermost layers have a pore volume of 1.40 ml / g or less. The maximum height of the profile (SRt) of the surface of the mold release layer is 1,700 nm or more; the gloss at 60 degrees of the surface of the mold release layer in the machine direction (MD) is 155% or more; the peel strength (A) of the surface of the mold release layer before heating is 2,000 mN / cm or less; the peel strength (B) of the surface of the mold release layer after heating at 100 DEG C is 2,500 mN / cm or less; and the difference between peel strengths before and after the heating, namely (B-A) is 2,000 mN / cm or less.

Description

technical field [0001] The present invention relates to a release polyester film for molding synchronous transfer useful as a base film of a molding synchronous transfer sheet used to decorate resin molded products such as electrical products and automobile parts. Background technique [0002] Currently, the so-called in-mold molding method in which transfer printing is performed simultaneously with molding is widely used as one of methods for decorating curved plastic molded products such as electrification products and automobile parts. The so-called in-mold molding method is to prefabricate a transfer sheet that laminates a printing layer including a release layer, a surface protection layer, a printing layer, an adhesive layer, etc. on a base film, and utilizes heat and pressure during plastic injection molding. A method of transfer printing. [0003] In recent years, with the background of improving the designability of molded products, base films having high gloss hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B44C1/17B29C45/14B32B27/36
CPCB29C45/14B32B27/36B44C1/17
Inventor 村中达也植田将史舟津良亮
Owner MITSUBISHI CHEM CORP
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