Surface protective film

A surface protection film and rubber technology, applied in the direction of film/sheet adhesives, adhesives, etc., can solve problems such as insufficient performance, poor adhesion stability over time, and difficulty in peeling off attached objects

Inactive Publication Date: 2008-05-28
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the adhesive composition is used in a paint protection film, the performance required in a surface protection film cannot be sufficiently satisfied.
For example, when a PSA sheet is formed using the PSA composition of Patent Document 3, the temporal stability of the adhesive force is poor, and the adhesive force fluctuates over time.
In addition, after the adhesive sheet is attached to the adherend such as a coating film, it is extremely difficult to peel off from the adherend, or even if it can be peeled off, residual stickiness tends to occur on the adherend after peeling.

Method used

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  • Surface protective film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] An adhesive composed of 100 parts by weight of styrene-based elastomer SIBS (2) and 20 parts by weight of alicyclic-based saturated petroleum resin (manufactured by Arakawa Chemical Co., Ltd., trade name: AlconP125) as tackifier resin was combined through a T-die Co-extrusion with a polypropylene base material layer made of polypropylene (produced by Sunallomer, model: PB170A) to obtain surface protection with a 10 μm thick rubber-based adhesive layer laminated on a 50 μm thick polypropylene base material membrane.

Embodiment 2～5 and comparative example 1～6

[0137] A surface protective film was obtained in the same manner as in Example 1, except that the styrene-based elastomer and tackifier resin used and their mixing ratios were changed as shown in Table 1 below.

[0138] (Evaluation of Examples and Comparative Examples)

[0139] The (1) shear storage elastic modulus and (2) tensile storage elastic modulus of the rubber-based pressure-sensitive adhesive layer in each of the surface protective films obtained as described above were determined according to the following points. In addition, (3) initial adhesion force, (4) initial peeling force, (5) lasting adhesion force, and (6) contamination by adhesion of the obtained surface protection film were evaluated according to the following points. The results are shown in Table 1 below.

[0140] (1) Shear storage modulus

[0141]Using a dynamic viscoelasticity spectrometer (manufactured by IT Instruments Co., Ltd., model: DVA200), the shear of the rubber-based adhesive layer was mea...

Embodiment 6

[0158] 70 parts by weight of SIBS (2) produced by Kaneka Co., Ltd. as a block copolymer (D) and 30 parts by weight of SEBS (2) produced by Asahi Kasei Co., Ltd. as a block copolymer (F) were mixed, and added as a tackifier 20 parts by weight of the resin was produced by YASUHARA CHEMICAL under the trade name ClearonLH to obtain an adhesive.

[0159] In addition, the above-mentioned SIBS as the block copolymer (D) is a block copolymer of styrene, isobutylene, and styrene, and includes a styrene-based polymer block (A) and an isobutylene-based polymer block (C). The above-mentioned SEBS as the block copolymer (F) is a block copolymer of styrene with ethylene, butene and styrene, including hydrogenation of a styrene-based polymer block (A) and a butadiene polymer block item (E).

[0160] Next, a rubber-based adhesive layer made of the adhesive and a base material layer made of polypropylene were co-extruded by a T-die method to obtain a 10-μm-thick rubber-based base material lam...

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Abstract

Disclosed is a surface protection film which has excellent initial adhesion and can be easily removed from an object to which it is adhered. The adhesive force of this surface protection film does not undesirably increase as time passes. Specifically disclosed is a surface protection film wherein a rubber adhesive layer is arranged on a polyolefin base. The rubber resin component is composed of a styrene elastomer which has a block copolymer of a styrene polymer block (A) and an olefin elastomer component (B), a block copolymer of a styrene polymer block (A) and a random copolymer block (B') of styrene and an elastomer component, or a hydrogenated product of either of the block copolymers as a main backbone. The rubber adhesive layer has a tensile storage modulus at a frequency of 10 Hz of not less than 2.5 109 Pa at -100 DEG C, and a shear storage modulus at a frequency of 10 Hz of from 5 104 to 5 106 Pa at 23 DEG C.

Description

technical field [0001] The present invention relates to a surface protection film for preventing dust from adhering to the surface of an object to be attached or preventing damage to the surface of the object to be attached, in particular to a surface protection film in which a rubber-based pressure-sensitive adhesive layer is laminated on the surface of a polyolefin-based substrate. Background technique [0002] In order to protect various articles or parts, a surface protective film is often temporarily adhered to the surface of the articles or parts. For example, in order to prevent dirt from adhering to various objects such as synthetic resin sheets, metal sheets, decorative plywood, coated steel sheets, coated resin sheets, or various nameplates during processing and transportation, especially in coating Surface protection films are often used on the surfaces of steel sheets and resin-coated sheets, or those surfaces are damaged. [0003] This surface protection film h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J153/02
Inventor 丰嶋克典野世溪元下浦由雄
Owner SEKISUI CHEM CO LTD
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