C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/1709, 400/18
C08L 93/04 (2006.01) B42C 9/00 (2006.01) C08L 53/02 (2006.01) C09J 131/04 (2006.01) C09J 153/02 (2006.01) C08L 91/06 (2006.01)
Patent
CA 1178734
ABSTRACT OF THE DISCLOSURE Hot melt adhesives especially suited for use in the-perfect bind- ing of books are prepared from (1) 15-30%X of a block polymer having the general configuration A-B-A wherein A is a non-elastomeric polymer block derived from the moieties of a nonvinyl aromatic hydrocarbon radical and B is an elastomeric polymer block derived from the moities of a conjugated diene monomer; (2) 5-10% of an ethylene vinyl acetate copolymer containing 17 to 42% vinyl acetate; wherein the ratio of the block polymer to the ethylene vinyl acetate copolymer is within the range of 1.75:1 to 6:1; (3) 25-40% of at least one rosin ester tackifier selected from the group consisting of glycerol and pentaerythritol esters of natural and modified rosins. (4) 25-35% of a wax diluent which is solid at room temperature: and (5) 0,5 to 3% of at least one stabilizer. The novel adhesives can be applied to coated stock which has not been primed, and they combine good application properties with the desirable book properties of "easy opening" and good "cold-crack".
396605
Borden Ladner Gervais Llp
National Starch And Chemical Corporation
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