The Procter Gamble Company

Manfred Zamzow

Hartwig Hocker

Process for the manufacture of polymers having repeating units comprising spiro orthoester groups of general formula (I), wherein A is C,-alkylene, C,-alkyleneoxycarbonyl or an oxygen-carbon bond, R,is hydrogen or methyl, R,is C,-alkyl or C,-alkyl substituted by C,-alkoxy or aryloxy, R,and R,independently are hydrogen or C,-alkyl, R,is hydrogen or methyl, R,is hydrogen, methyl, phenyl, carboxy, carboxy-C,-alkyl, carboxamido or cyano, n is an integer >1 and m is 0 or an integer &gE;1, with the proviso that the molecular weight of the polymer is between 500 and 1,000,000, the polymers obtained and their use specifically in dental filling materials.

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Aachen, Germany

Manfred Zamzow