| 摘要 |
It has been found that non-chlorinated pentafluoropropane blowing agents may be used alone or in combination with water in flexible integral skin foams. For exa mple, foams prepared using 1,1,1,3,3-pentafluoropropane (HFA-245fa) alone or in combin ation with water exhibit physical characteristics such as resistance to abrasion and c racking on flex comparable to conventional chlorinated fluorocarbon blown foams. The foams of the present invention are suitable for use in many applications including, for examp le, shoe soles.
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