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1. US20170233619 - ACRYLIC PRESSURE-SENSITIVE ADHESIVE COMPOSITIONS AND PRESSURE-SENSITIVE ADHESIVE PRODUCTS

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[ EN ]

Claims

1. A pressure-sensitive adhesive composition comprising:
(i) 100 parts by mass of an acrylic block copolymer (I) comprising a polymer block (A) comprising methacrylate ester units and a polymer block (B) comprising acrylate ester units,
wherein the acrylic block copolymer (I) has a weight average molecular weight of 30,000 to 300,000, and the acrylate ester units in the polymer block (B) comprise not less than 80 mass % of units from an acrylate ester (1) represented by the formula:

          CH 2═CH—COOR 2
wherein R 2 is an organic group having 7 to 12 carbon atoms;
(ii) 1 to 300 parts by mass of a tackifier resin; and
(iii) 1 to 200 parts by mass of at least one plasticizer selected from the group consisting of a process oil, an organic acid ester, and an oligomer of an organic acid ester.
2. The pressure-sensitive adhesive composition according to claim 1, wherein the plasticizer (iii) is a process oil.
3. The pressure-sensitive adhesive composition according to claim 1, wherein the tackifier resin (ii) is at least one selected from a hydrocarbon resin, a terpene resin, a rosin resin and hydrogenated products of these resins.
4. The pressure-sensitive adhesive composition according to claim 1, wherein the acrylate ester (1) is 2-ethylhexyl acrylate.
5. The pressure-sensitive adhesive composition according to claim 1, wherein the acrylate ester units in the polymer block (B) consist solely of units from the acrylate ester (1) represented by the formula:

          CH 2═CH—COOR 2
wherein R 2 is an organic group having 7 to 12 carbon atoms.
6. The pressure-sensitive adhesive composition according to claim 1, wherein the composition comprises two or more kinds of tackifier resins (ii).
7. A pressure-sensitive adhesive product comprising a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition according to claim 1.
8. A laminate comprising a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition according to claim 1.
9. A film comprising a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition according to claim 1.