RUBBER-BASED ADHESIVE MASS COMPOSITION

PROBLEM TO BE SOLVED: To obtain a rubber-based adhesive mass composition exhibiting the tacky adhesivity and a corrugated fiberboard sealability comparable or superior to a coumarone-indene resin, having remarkably decreased smell and useful in the field of food, medical care, etc., by including a specific aromatic polymer as an adhesive mass. SOLUTION: The rubber-based adhesive mass composition contains (A) a styrene-based thermoplastic block copolymer [e.g. a polymer of formula A-B (A and B are a styrene polymer block and a conjugated diene polymer block, respectively, and the weight ratio of A/B is 10/90 to 30/70) or a polymer of formula A-B-A] as a main component and further (B) an aromatic polymer produced by the polymerization of a compound of formula (R1 is H or methyl; R2 is a 1-3C alkyl preferably substituted at m-site or p-site) (e.g. a polymer having a weight-average molecular weight of 300-3,000) as a tackifier. The amount of the polymer B in the composition is preferably 10-50 pts.wt. based on 100 pts.wt. of the copolymer A.