| abstract |
PURPOSE: To improve the processability, breaking strength, tear strength and flex resistance remarkably, by incorporating cyclopentadiene or dicyclopentadiene petroleum resin with ethylene-propylene rubber. n CONSTITUTION: Cyclopentadiene or dicyclopentadiene petroleum resin in an amount of 3W50pts.wt., preferably 5W30pts.wt., based on 100pts.wt. rubber is incorporated with ethylene-propylene rubber or a rubber mixture containing 50wt% or more said rubber. The cyclopentadiene petroleum resin to be used has a softening point of 50W200°C, preferably 80W150°C, and a bromine value of 40W150, preferably 50W150. n COPYRIGHT: (C)1981,JPO&Japio |