Sealant based on thermoplastic elastomer and mixed modifying resins

Claim 1

A sealant composition which exhibits low surface tack after application comprising (1) a thermoplastic elastomer having the structure ABA or (AB) n Y, wherein A represents a block of a polymerized monovinyl-substituted aromatic compound, B represents a block of a polymerized conjugated diene, Y represents a residue of a polyfunctional coupling agent or a polyfunctional initiator, and n is an integer having a value of 2 to 4, said thermoplastic elastomer having a weight ratio of said monovinyl-substituted aromatic compound to said conjugated diene within the range of 50:50 to 5:95, said elastomer having the unsaturation normally associated with such polymers; (2) 10-15 parts by weight per 100 parts by weight of said thermoplastic elastomer of a poly(vinyl aromatic)-compatible modifying resin component which is an aromatic hydrocarbon; (3) 10-150 parts by weight per 100 parts by weight of said thermoplastic elastomer of a poly(conjugated diene)-compatible modifying resin component which is nonaromatic selected from normally solid modified and unmodified rosin and rosin esters of polyhydric alcohols, normally solid esters of polymerized rosin, polyterpene resins, and resinous polyolefins derived from aliphatic and cycloaliphatic olefins; and (4) 25-250 parts by weight per 100 parts by weight of said thermoplastic elastomer of a filler.