| 摘要 |
PURPOSE:To contemplate improvements in modulus, hardness and elongation after vulcanization, by providing a rubber compsn. by blending solid rubber with a specified novolak type addition condensation resin. CONSTITUTION:This rubber compsn. contains 100pts.wt. solid rubber (A) and 1-50pts.wt. cyclo-pentenyl phenol compd. of the formula (wherein R1, R2 are each H, an alkyl, halogen or cyclopentenyl group; R1, R2 may be the same or different groups; hydrogen atoms are attached at least two positions among p- and o- positions against OH group) or material which has a weight-average MW of 4,000-14,000 and is a novolak type addition condensation resin derived from said compd., cresol or an aldehyde (B). Examples of the starting aldehyde for said resin are formaldehyde, paraformaldehyde and accetaldehyde. |
