Gordon Blackwell;Stefan Brugger;Denise Achilles;Jorg Kempter
发明人:
Gordon Blackwell,Stefan Brugger,Denise Achilles,Jorg Kempter
申请号：
US12814598
公开号：
US08440740B2
申请日:
2010.06.14
申请国别(地区):
US
年份:
2013
代理人:
摘要：
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.
