Cyclic pyrophosphate derivatives and their preparation
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United States of America Patent
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Sep 13, 1983
Grant Date -
N/A
app pub date -
Feb 5, 1981
filing date -
Aug 20, 1980
priority date (Note) -
Expired
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Abstract
A cyclic pyrophosphate derivative having the formula ##STR1## wherein A represents a direct bond between the two phenyl rings or a divalent moiety selected from the group consisting of lower alkylene, aryl substituted lower alkylene, cycloalkylidene, sulfonyl and oxy; R.sup.1 represents alkyl, acryloyloxy lower alkyl or methacryloyloxy lower alkyl in which the lower alkyl can be substituted with halogen; and R.sup.2 represents independently hydrogen, halogen, lower alkyl or lower alkoxy; a method of preparing the same, a dental filling material comprising the same and a method of filling dental cavities are disclosed.
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