| 摘要 |
<p>A cushion gum of having a diene rubber and between 5 and 60 phr of a plasticizing hydrocarbon resin having a glass transition temperature greater than about 20°C, 60°C or even greater than 70°C and a number average molecular weight less than 2000. The cushion gum may comprise between 10 and 30 phr of the resin in particular embodiments. The plasticizing resin may be a terpene resin comprising units resulting from the polymerization of limonene, alpha pinene, beta pinene or combinations thereof; homopolymers or copolymers of cyclopentadiene (CPD) or dicyclopentadiene (DCPD), homopolymers or copolymers of terpene, homopolymers or copolymers of a C<SUB>5</SUB> cut and mixtures thereof; and/or copolymers of (D)CPD/ vinyl-aromatic, of (D)CPD/ terpene, of (D)CPD/ C<SUB>5</SUB> cut, of terpene/vinyl-aromatic, of C<SUB>5</SUB> cut/vinyl-aromatic and of combinations thereof.</p> |
