Surface protective film

JP7874807B2Active Publication Date: 2026-06-16NITTO DENKO CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NITTO DENKO CORP
Filing Date
2025-01-09
Publication Date
2026-06-16

AI Technical Summary

Benefits of technology

【0012】 本発明によれば、光学デバイスや電子デバイスの製造工程において、加工、組立、検査、輸送などの際の光学部材や電子部材の表面の傷付き防止のために露出面に貼着することを主たる用途とする、粘着剤層を含む表面保護フィルムであって、紫外線照射前は被着体に対して十分な強粘着力を発現でき、紫外線照射後は被着体からスムーズに剥離できる優れた軽剥離性を発現でき、さらに、紫外線照射前における打痕の発生が抑制され、また、紫外線照射による硬化収縮を抑制できる、表面保護フィルムを提供することができる。また、そのような表面保護フィルムを含む光学デバイスおよび電子デバイスを提供することができる。

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Abstract

To provide a surface protective film that includes an adhesive layer, the surface protective film being capable of exhibiting sufficient strong adhesive force to an adherend before ultraviolet irradiation, being capable of exhibiting excellent light peelability that allows smooth peeling from the adherend after ultraviolet irradiation, and being capable of suppressing generation of dents before ultraviolet irradiation and suppressing curing shrinkage due to ultraviolet irradiation.　A surface protective film according to an embodiment of the present invention is a surface protective film that includes an adhesive layer, wherein the adhesive that constitutes the adhesive layer is formed from an adhesive composition, the adhesive composition contains a urethane prepolymer (A), a crosslinking agent (B), and a photopolymerization initiator (C), the urethane prepolymer (A) includes a specific alkylene oxide skeleton, the gel fraction of the adhesive is 15.0-80.0%, and the gel fraction of the adhesive after the adhesive has been irradiated with ultraviolet rays having a cumulative light intensity of 700 mJ / cm2 by a 365 nm LED light source is 70.0-92.0%.
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Claims

1. A surface protective film including an adhesive layer, The adhesive constituting the adhesive layer is formed from an adhesive composition, The adhesive composition comprises a urethane prepolymer (A), a crosslinking agent (B), and a photopolymerization initiator (C). The urethane prepolymer (A) comprises an alkylene oxide skeleton containing two groups of at least one group selected from the group consisting of methylene groups and methine groups, and an alkylene oxide skeleton containing three or more groups of at least one group selected from the group consisting of methylene groups and methine groups. The hydroxyl value of the urethane prepolymer (A) is 2.0 KOH mg / g to 11.0 KOH mg / g. The polymerizable double bond content in the urethane prepolymer (A) is 0.10 mol / kg to 0.50 mol / kg. The crosslinking agent (B) is a polyfunctional isocyanate compound, The equivalent ratio of the NCO group in the polyfunctional isocyanate compound to the OH group in the urethane prepolymer (A) is 0.2 to 2.5 as NCO group / OH group. The gel fraction of the adhesive is 15.0% to 80.0%. The adhesive is subjected to an integrated light intensity of 700 mJ / cm using an LED light source with a wavelength of 365 nm. 2 The gel fraction of the adhesive after irradiation with ultraviolet light is 70.0% to 92.0%. Surface protective film.

2. The surface protective film according to claim 1, wherein the adhesive composition comprises urethane (meth)acrylate (D).

3. An optical device comprising a surface protective film according to claim 1 or 2.

4. An electronic device comprising the surface protective film according to claim 1 or 2.