The present invention discloses liquid cyclic phosphites of for example the formula I or Il. Also disclosed is a stabilized composition comprising a polyolefin and a liquid cyclic phosphite of the formula I or Il and a process for the stabilization of polyolefins by incorporating therein or applying thereto a liquid cyclic phosphite of the formula I or II. The present liquid phosphite stabilizers of the formula I or Il are especially compatible with polyolefins.
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