The present invention relates to an aqueous dental composition having a pH of less than 7 as well as to the use of a stabilizer for the preparation of an aqueous dental composition having a pH of less than 7.
In particular, the present invention relates to an aqueous dental composition having a pH of less than 7 comprising
(i) one or more polymerizable compounds having at least one polymerizable double bond;
(ii) a polymerization initiator system containing
(a) an 1,2-diketone photoinitiator compound having a light absorption maximum in the range from 300 to 500 nm; and
(b) a coinitiator compound;
(iii) a stabilizer of the following formula (I) and/or (II):
wherein
the Rs,
which may be the same or different, independently represent a branched C3-8 alkyl or alkenyl group, or a C3-8 cycloalkyl or cycloalkenyl group,
R'
represents a C1-6 alkyl or C2-6 alkenyl group, or a C1-6 fluoroalkyl or C2-6 fluoroalkenyl group,
X
represents a group selected from a C1-8 alkyl group or a C3-8 cycloalkyl group, and
n
is 0, 1 or 2; and
(iv) a solvent mixture comprising an organic solvent and at least 1 percent by weight of water based on the total weight of the aqueous dental composition.
本发明涉及一种 pH 值小于 7 的
水性牙科组合物,以及使用稳定剂制备 pH 值小于 7 的
水性牙科组合物。
本发明尤其涉及一种 pH 值小于 7 的
水性牙科组合物,该组合物包括
(i) 具有至少一个可聚合双键的一种或多种可聚合化合物;
(ii) 一种聚合
引发剂体系,含有
(a) 1,2-二酮光
引发剂化合物,其光吸收最大值在 300 至 500 纳米之间;及
(b) 共
引发剂化合物;
(iii) 下式(I)和/或(II)的稳定剂:
其中
Rs、
可以相同或不同,各自代表支链 C3-8 烷基或烯基,或 C3-8 环烷基或环 烯基、
R'
代表 C1-6 烷基或 C2-6 烯基,或 C1-6 氟烷基或 C2-6
氟烯基、
X
代表选自 C1-8 烷基或 C3-8 环烷基的基团,以及
n
是 0、1 或 2;以及
(iv) 溶剂混合物,包括有机溶剂和至少 1%(按
水性牙科组合物总重量计)的
水。