Pressure-sensitive adhesive block copolymer composion

Abstract

Abstract Pressure-sensitive adhesive comprises, by weight: -100 parts of a mixture of 2 block copolymers:- a) at least 50% of A 1 -B 1 -A 2 , where A,, A 2 are monovinyl-substituted aromatic blocks; e.g. styrene, of average mol. wt ≥ 10,000 for A 2 and ≤ 5,000 for A 2 , and B, is conjugated diene block, e.g. isoprene and b) up to 50% of A 3 -B 2 -A 4 or (A 5 -B 3 )n X where A 3 , A 4 , A 5 are each monovinyl substituted aromatic blocks of average mol. wt ≥ 8,000, B 2 , B 3 each is a conjugated diene block, X is a coupling agent residue, e.g. silicon tetrahalide, n = 2-6, and total of A, + A 2 or A3 + A 4 or n x A 5 each is not more than 50% of respective copolymer; and - 20 to 400 parts of a tackifier resign, e.g. a terpene resin. The composition in a solvent is coated on a polyester film to make an adhesive tape which is useful to seal corrugated board or carton boxes.

Inventors

• 👤 Yoshihiro Minamizaki
• 👤 Yoshio Miki
• 👤 Takayuki Yamamoto
• 👤 Akira Japan Synthetic Rubber Co. Ltd. Iio
• 👤 Toshinori Japan Synthetic Rubber Co.Ltd. Sakagami

Bibliographic Details