pressure sensitive adhesive composition
A technology of pressure-sensitive adhesives and compositions, applied in the direction of adhesive types, ester copolymer adhesives, adhesives, etc.
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preparation example 1
[0135] Preparation Example 1. Preparation of Block Copolymer (A)
[0136] A monomer mixture comprising MMA and butyl methacrylate (BMA) in a weight ratio of 7:3 (MMA:BMA) was used as the first block-forming monomer with an appropriate amount of ethyl 2-bromoisobutyrate (EBiB) Mix with ethyl acetate (EAc). The flask containing the mixture was sealed with a rubber membrane and nitrogen purged and stirred at about 25°C for about 30 minutes to remove remaining oxygen by bubbling. After that, an appropriate amount of CuBr 2 , a mixture of tris(2-pyridylmethyl)amine (TPMA) and 2,2'-azobis(2,4-dimethylvaleronitrile) (V-65) (the appropriate amount of oxygen has been removed) was added And immerse in the reactor at about 67°C to initiate the reaction (polymerization of the first block). When the conversion of MMA reached about 75%, the mixture used to form the second block, previously sparged with nitrogen, was added in the presence of nitrogen. Prepared for the formation of Mixtu...
preparation example 2 to 7
[0137] Preparations 2 to 7. Preparation of block copolymers (A2 to A4 and B1 to B3).
[0138]A block copolymer was prepared by the same method as described in Preparation Example 1, except controlling the monomers used in the polymerization reaction of the first block and the second block and their weight ratios as shown in Table 1. EbiB, EA, CuBr 2 , TPMA and V-65 respectively correspond to the catalyst, solvent and initiator in the preparation of the block copolymer, and these reagents are added in appropriate amounts in consideration of the polymerization efficiency.
[0139] [Table 1]
[0140]
[0141] The properties of the block copolymers prepared according to the above method are shown in Table 2.
[0142] [Table 2]
[0143]
preparation example 8
[0144] Preparation Example 8. Preparation of Random Copolymer (B4)
[0145] The MMA of 10 parts by weight, the n-butyl acrylate of 87.3 parts by weight and the 4-hydroxybutyl acrylate of 2.7 parts by weight are joined in the 1L reaction vessel that is equipped with cooling device to carry out nitrogen reflux and is conducive to temperature control, add 200ppm n-butyl Dodecyl mercaptan was used as a molecular weight control agent, and then 120 parts by weight of ethyl acetate was added as a solvent. After that, nitrogen was purged for about 60 minutes to remove oxygen, 0.05 parts by weight of azobisisobutyronitrile (AIBN) was added as an initiator at 60° C., and a reaction was performed for about 8 hours, thereby preparing a random copolymer. The prepared random copolymer (B4) had a number average molecular weight (Mn) of about 132000 and a polydispersity index (PDI) of about 4.6.
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