Aqueous dispersion type pressure-sensitive adhesive composition and pressure-sensitive adhesive product
A pressure-sensitive adhesive, pressure-sensitive adhesive layer technology, applied in the direction of adhesive types, ester copolymer adhesives, acid copolymer adhesives, etc., can solve problems such as poor usability
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preparation example Construction
[0053] (Preparation example of acrylic pressure-sensitive adhesive)
[0054] Charge 46 parts of 2-ethylhexyl acrylate, 2.5 parts of butyl acrylate, 1 part of acrylonitrile, 0.5 parts of acrylic acid and 1 part of lauryl An emulsion prepared by emulsifying sodium sulfate in 75 parts of water. Nitrogen substitution was performed at room temperature (25° C.) for 1 hour while stirring. Then 0.025 parts of 2,2'-azobis(2-amidinopropane) dihydrochloride (polymerization initiator) was added thereto. The resulting mixture was polymerized at a temperature of 60°C for 3 hours (first-stage polymerization). Thereafter, 0.1 parts of potassium persulfate was further added to the reactor. During the polymerization of the reaction mixture (second-stage polymerization), 46 parts of 2-ethylhexyl acrylate, 2.5 parts of butyl acrylate, 1 part of acrylonitrile, 0.5 parts of acrylic acid and 1 part of lauryl were added dropwise thereto at 70°C over 3 hours. The resulting emulsion was emulsified ...
Embodiment 1
[0056] To 100 parts by weight (on a solid basis) of pressure-sensitive adhesive A, 2 parts of polyethylene glycol (weight average molecular weight: 500,000) and 0.3 parts of an oil-soluble epoxy crosslinking agent (trade name "Tetrad C", manufactured by Mitsubishi Gas Chemical Company Inc.). The resulting composition was spread to a basis weight of 30 g / m 2 On one side of the Japanese paper (substrate), the thickness is 20 micrometers on a dry basis, and the coating is dried. Thus a pressure-sensitive adhesive tape was obtained.
Embodiment 2
[0058] To 100 parts by weight (on a solid basis) of pressure-sensitive adhesive A were added 10 parts of polyvinylpyrrolidone (weight-average molecular weight: 900,000) and 0.3 parts of an oil-soluble epoxy crosslinking agent (trade name "Tetrad C", manufactured by Mitsubishi Gas Chemical Company Inc.). The resulting composition was spread to a basis weight of 30 g / m 2 On one side of the Japanese paper (substrate), the thickness is 20 micrometers on a dry basis, and the coating is dried. Thus a pressure-sensitive adhesive tape was obtained.
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