.beta.-diketones, processes for making .beta.-diketones and use of .beta.-diketones as stabilizers for PVC
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United States of America Patent
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Dec 12, 1995
Grant Date -
N/A
app pub date -
Nov 5, 1993
filing date -
Nov 6, 1992
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Abstract
The present invention is directed to compositions containing novel beta-diketones of formula (I) and formula (II), R.sub.1 COCH.sub.2 COR.sub.2 (I) R.sub.2 COCH.sub.2 COR.sub.2 (II) which may be used to stabilize various polymers, such as polyvinyl chlorides (PVCs). The present invention is also directed to a method for preparing .beta.-diketones by a Claisen condensation reaction, which is represented as follows: R.sub.4 COCHR.sub.5 H+R.sub.6 C(O)OR.sub.7 +RO.sup.- .fwdarw.[R.sub.4 COCR.sub.5 COR.sub.6 ]--+R.sub.7 OH+ROH.
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