Salts of polyalkyl vinyl ether maleic anhydride and dental prosthesis adhesive produced therefrom
AssigneeGiulini Chemie GmbH
InventorsZvi Pelah, Ernst Urmann, Werner Kopp
Life of this patent
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Abstract
Salts of lower alkyl vinyl ether/maleic anhydride are described as active components in dental adhesives. A process for the preparation of these salts is described. The salts are partially neutralized mixed salts of lower alkyl vinyl ether/maleic anhydride copolymers. The neutralization of the copolymer is effected with aluminum, and calcium and/or sodium.
Claims8
In a dental prosthesis adhesive the improvement comprising a mixed partially neutralized salt of alkyl vinyl ether/maleic anhydride copolymers including the following structural unit ##STR3## where R represents an alkyl radical having 1 to 4 carbon atoms, 30 to 95% of the carboxyl groups are neutralized with aluminum, and at least one of calcium and sodium, the pH of the salts is between about 6.5 and 7.5 and n is an integer greater than zero, and n is selected so that the specific viscosity of the corresponding anhydride is between about 2.6 and 3.5 and the Al:Ca ratio is between about 1:1 and 1:4.
A mixed partially neutralized salts of alkyl vinyl ether/maleic anhydride copolymers including the following structural unit ##STR4## where R represents an alkyl radical having 1 to 4 carbon atoms, 30 to 95% of the carboxyl groups are neutralized with aluminum and at least one of calcium and sodium, the pH of the salts is between about 6.5 and 7.5 and n is an integer greater than zero, and n is selected so that the specific viscosity the corresponding anhydride is between about 2.6 and 3.5 and the Al:Ca ratio is between about 1.1 and 1.4.
A process for the preparation of a mixed partially neutralized salt of methyl vinyl ether/maleic anhydride copolymer including the following structural unit ##STR5## where R represents methyl, 30 to 95% of the carboxyl groups are neutralized with aluminum, calcium and sodium, the pH of the salts is between about 6.5 and 7.5 and n is an integer greater than zero, and n is selected so that the specific viscosity of the corresponding anhydride is between about 2.6 and 3.5 and the Al:Ca ratio is between about 1:1 and 1:4, comprising:
- neutralizing the carboxyl groups of a methyl vinyl ether/maleic anhydride copolymers with an aluminum compound to produce an aluminum salt of the methyl vinyl ether/maleic acid anhydride copolymer;
- and
- reacting said partially neutralized aluminum salt of methyl vinyl ether/maleic anhydride copolymer with a Ca/Na salt of the same copolymer in an alcohol reaction medium to produce a mixed partially neutralized salts of methyl vinyl ether/maleic anhydride copolymers including the following structural unit ##STR6## where R represents methyl, 30 to 95% of the carboxyl groups are neutralized with aluminum, calcium and sodium, the pH of the salts is between about 6.5 and 7.5 and n is an integer greater than zero, and n is selected so that the specific viscosity of the corresponding anhydride is between about 2.6 and 3.5 and the Al:Ca ratio is between about 1:1 and 1:4.
A process for the preparation of a mixed partially neutralized salt of alkyl vinyl ether/maleic anhydride copolymers, including the following structural unit ##STR7## where R represents an alkyl radical having 1 to 4 carbon atoms, 30 to 95% of the carboxyl groups are neutralized with aluminum, calcium and sodium, the pH of the salts is between about 6.5 and 7.5 and n is an integer greater than zero, and n is selected so that the specific viscosity of the corresponding anhydride is between about 2.6 and 3.5 and the Al:Ca ratio is between about 1:1 and 1:4, comprising:
- reacting alkyl vinyl ether/maleic anhydride copolymers with calcium, aluminum, and sodium compounds in an alcohol reaction medium to produce said mixed partially neutralized salt of alkyl vinyl ether/maleic anhydride copolymers.
A process for the preparation of a mixed partially neutralized salts of alkyl vinyl ether/maleic anhydride copolymers, including the following structural unit ##STR8## where R represents an alkyl radical having 1 to 4 carbon atoms, 30 to 95% of the carboxyl groups are neutralized with aluminum, calcium and sodium, the pH of the salts is between about 6.5 and 7.5 and n is an integer greater than zero, and n is selected so that the specific viscosity of the corresponding anhydride is between about 2.6 and 3.5 and the Al:Ca ratio is between about 1:1 and 1:4, comprising:
- reacting Ca/Na salts of alkyl vinyl ether/maleic anhydride copolymers with an aluminum compound in an alcohol reaction medium to produce said mixed partially neutralized salts of alkyl vinyl ether/maleic acid anhydride copolymers.
Dependencies are inferred from the claim text.