| 摘要 |
<p>A case or cover for a hard bound book is formed by bonding the formed by bonding the cover boards to the book cover stock using a hot melt pressure sensitive adhesive extensions comprising: a) 10 to 40% by weight of a substantially radial styrene-butadiene block copolymer, the copolymer having a styrene content greater than about 35% by weight, a modulus at 300% elongation of at least 4.5 MPa and a solution viscosity less than about 1000 cps; b) 20 to 65% by weight of a compatible tackifying resin; c) 0.1 to 4% by weight stabilizer; and d) the remainder (to 100%) comprising a plasticizing oil. </p> |
