Dental glass compositions utilizing a glass ionomer and an acidic copolymer

US8440740B2 · kind B2 · utility

Assignee

• Dentsply International Inc. · US

Inventors

• Gordon Blackwell · Konstanz, DE
• Stefan Brugger · Radolfzell, DE
• Denise Achilles · Konstanz, DE
• Jörg Kempter · Konstanz, DE

Key dates

• Filing date: Jun 14, 2010
• Grant date: May 14, 2013
• Expiry date: Jun 14, 2030

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K6/30
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A hardening composition comprising a particulate glass, said glass comprising 10-35% by weight of silica, 10-35% by weight of alumina, 3-30% by weight of zinc oxide, 4-30% by weight of P2O5 and 3-25% by weight of fluoride, and an acidic copolymer reactive with the particulate glass under aqueous conditions. An aqueous polymer solution comprising 10 to 65% by weight of the acidic copolymer of the hardening composition with a mean molecular weight of from 50,000 to 200,000, obtainable by a process comprising the copolymerization of a mixture containing acrylic acid and an acrylic acid ester (I) and/or a compound of the formula (II) and, optionally, a compound of the formula (III):wherein k is an integer of from 1 to 5; h is an integer from 0 to (5−k); n is an integer of from 1 to 3; R1 is hydrogen or a C1-6 alkyl group, and; R2 and R3 independently represent hydrogen, a C1-6 alkyl group or a moiety of the following formula (IV):wherein m independently is an integer of from 0 to 3, and L is —CH2— or —CH═CH—; provided that at least one of R1, R2 or R3 is not hydrogen.