| 摘要 |
Disclosed herein are hard and flexible compositions, i.e., compositions which have a flexural modulus that is less than the value that is expected based on the composition's hardness. The compositions preferably have a hardness/modulus relationship represented by the formula H≧11.889Ln(M)+47, where H is the hardness of the composition, in JIS-C, and M is the flexural modulus of the composition, in ksi; or a softness/stiffness relationship represented by the formula if M<110, then H≧8.5218Ln(M)+32.5 if M≧110, then H≧72.5, where H is the hardness of the composition, in Shore D, and M is the flexural modulus of the composition, in ksi.
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