Surface protective film, and optical components to which it is attached.

JP7875249B2Active Publication Date: 2026-06-17ZACROS CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
ZACROS CORP
Filing Date
2024-08-21
Publication Date
2026-06-17

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Patent Text Reader

Abstract

To provide a surface protective film having a high inhibiting effect on curling of an optical film and an optical component using the same.SOLUTION: There is provided a surface protective film P in which a first transparent film 1, a first adhesive layer 2, a second transparent film 3 and a second adhesive layer 4 are laminated in sequence. The storage modulus of the first adhesive layer 2 is 1.0×104 Pa or more and less than 8.0×104 Pa at 23°C. The adhesive strength of the first adhesive layer 2 is higher than that of the second adhesive layer 4. The adhesive strength of the second adhesive layer 4 to glass is 0.5 N / 25 mm or less.SELECTED DRAWING: Figure 1
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Claims

1. A first transparent film, a first adhesive layer, a second transparent film, and a second adhesive layer are laminated in that order. The storage modulus of the first adhesive layer at 23°C is 1.0 × 10⁻⁶. ４ Pa or more 8.0×10 ４ It is less than Pa, The adhesive strength of the first adhesive layer to the glass is 1.6 N / 25 mm or more and 5 N / 25 mm or less. The adhesive strength of the first adhesive layer is higher than that of the second adhesive layer. The adhesive force of the second adhesive layer to the glass is 0.5 N / 25 mm or less. The second adhesive layer is formed from an adhesive containing a (meth)acrylic polymer as a base polymer, with an isocyanate-based curing agent added as the curing agent. The thickness of the first transparent film is 20 μm or more and 50 μm or less. The thickness of the first adhesive layer is 3 μm or more and 30 μm or less. The thickness of the second transparent film is 25 μm or more and 38 μm or less. The thickness of the second adhesive layer is 5 μm or more and 30 μm or less. Surface protective film.

2. The surface resistivity of the second adhesive layer is 1 × 10 １３ The surface protective film according to claim 1, wherein the value is less than [Ω / □].

3. An optical component to which the surface protective film described in claim 1 or 2 is attached.