Acrylic adhesive composition, acrylic adhesive sheet, and method for bonding the adhesive sheet to coated surface of automobile
An acrylic, composition technology, applied in the direction of bonding method, adhesive type, ester copolymer adhesive, etc., can solve the problems of reduced adhesive force, reduced adhesiveness, and unobtainable adhesive sheets.
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Embodiment 1
[0167](Synthesis of Copolymerized Oligomer (B1))
[0168] 148.5 parts by weight of cyclohexyl methacrylate, 1.5 parts by weight of single-end modified silicone oil ("X-22-2426" produced by Shin-Etsu Silicone Co., Ltd.), 4.5 parts by weight of 2-mercapto Ethanol, 0.3 parts by weight of 2,2'-azobisisobutyronitrile (AIBN), and 154.5 parts by weight of toluene were put into the flask. Polymerization was carried out at 70°C for 2 hours, followed by further aging at 80°C for 1 hour. Thereafter, toluene was distilled off from the reaction liquid, and it was further dried with a reduced-pressure drier to obtain a copolymerized oligomer (B1).
[0169] According to GPC (gel permeation chromatography), the copolymerized oligomer (B 1) had a polystyrene-equivalent weight-average molecular weight (the same applies hereinafter) of 4000, and a Tg (theoretical value) of 64°C.
[0170] (Preparation of Alkyl (Meth)acrylate Partial Polymer (A1) (UV Paste))
[0171] 0.05 parts by weight of tra...
Embodiment 2
[0184] Except that the acrylic adhesive composition was prepared by adding 10 parts by weight of the copolymerized oligomer (B1), the PET film-based acrylic adhesive sheet (I-d) and the acrylic foam-based adhesive sheet were obtained in the same manner as in Example 1. material acrylic adhesive sheet (II-d).
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