EP-4029839-B1 - GLASS POWDER AND CHEMICAL POLYMERIZATION INITIATOR
Inventors
- SATO, KEITA
- FUJIMI, Atsushi
- MURAKAMI, SHOGO
- FUJIMOTO AYAKA
Dates
- Publication Date
- 20260506
- Application Date
- 20200819
Claims (2)
- A glass powder for a chemical polymerization initiator, the glass powder comprising: aluminum, silicon, and at least one of copper or vanadium, characterized in that a content of silicon, when converted into an amount of silicon oxide SiO 2 , is 20 to 50% by mass, a content of aluminum, when converted into an amount of aluminum oxide Al 2 O 3 , is 20 to 40% by mass, a content of strontium, when converted into an amount of strontium oxide SrO, is 15 to 40% by mass, a content of fluorine is 1 to 30% by mass, a content of phosphorus, when converted into an amount of phosphorus oxide P 2 O 5 , is 0.1 to 15% by mass, and a content of copper and/or vanadium, when converted into an amount of copper oxide CuO and/or vanadium oxide V 2 O 5 , is 0.1 to 5% by mass.
- A chemical polymerization initiator comprising: the glass powder of claim 1.
Description
[Technical Field] The present invention relates to a glass powder and a chemical polymerization initiator. [Background Art] In dental treatment, dental cement is used when attaching a prosthesis. As a dental polymerizable composition, other than dental cement, a protective material for hypersensitivity, a pediatric sealant and the like are used. As an example of the dental polymerizable composition, a two-agent dental polymerizable composition that includes a first agent including a (meth)acrylate having an acid group and an organic peroxide, and a second agent including a (meth)acrylate having no acid group, a thiourea derivative, a vanadium compound, and fluoroaluminosilicate glass powder is known (see, for example, Patent Literature 1). Other dental polymerizable compositions including glass powder are known from WO 2006/013111 A1, US 2011/142902 A1 and US 5 387 558 A. [Citation List] [Patent Literature] [PTL 1] Japanese Laid-Open Patent Publication No. 2012-51856 [Summary of Invention] [Technical Problem] However, it has been desired to improve the curability of the two-agent dental polymerizable composition after long-term storage, that is, to improve the storage stability of the dental polymerizable composition. One aspect of the present invention is intended to provide a glass powder and a chemical polymerization initiator capable of improving storage stability of a two-agent dental polymerizable composition. [Solution to Problem] One aspect of the present invention includes: a glass powder for a chemical polymerization initiator, the glass powder including aluminum, silicon, and at least one of copper or vanadium and as defined in claim 1. Another aspect of the present invention includes: a chemical polymerization initiator including the glass powder of claim 1. [Advantageous Effects of Invention] According to one aspect of the present invention, a glass powder and a chemical polymerization initiator capable of improving storage stability of a two-agent dental polymerizable composition, can be provided. [Description of Embodiments] In the following, embodiments of the present invention will be described. <Glass powder> A glass powder according to the present embodiment includes aluminum, silicon, and copper and/or vanadium. When the glass powder according to the present embodiment is incorporated into a two-agent dental polymerizable composition described later, the storage stability can be improved. The glass powder according to the present embodiment functions as a reducing agent for a chemical polymerization initiator. The glass powder according to the present embodiment can be used as a chemical polymerization initiator by combining with an oxidizing agent for a publicly-known chemical polymerization initiator. The content of silicon (Si) in the glass powder according to the present embodiment, when converted into the amount of silicon oxide (SiO2), is 20 to 50% by mass, and preferably 25 to 40% by mass. When the content of silicon (Si) in the glass powder according to the present embodiment, when converted into the amount of silicon oxide (SiO2), is 20% by mass or more, it is easier to make glass, and when the content is 50% by mass or less, the curability and the mechanical strength of the cured product of the two-agent dental polymerizable composition are further improved when the glass powder according to the present embodiment is blended into the two-agent dental polymerizable composition. The content of copper (Cu) and/or vanadium (V) in the glass powder according to the present embodiment, when converted into the amount of copper oxide (CuO) and/or vanadium oxide (V2O5), is 0.1 to 5% by mass, and preferably 0.2 to 2% by mass. When the content of copper (Cu) and/or vanadium (V) in the glass powder according to the present embodiment, when converted into the amount of copper oxide (CuO) and/or vanadium oxide (V2O5), is 0.1% by mass or more, the storage stability of the two-agent dental polymerizable composition is further improved when the glass powder according to the present embodiment is blended into the two-agent dental polymerizable composition, and when the content is 5% by mass or less, coloring of the glass powder according to the present embodiment is suppressed so that the aesthetic of the two-agent dental polymerizable composition is further improved when the glass powder according to the present embodiment is blended into the two-agent dental polymerizable composition. The content of aluminum (Al) in the glass powder according to the present embodiment, when converted into the amount of aluminum oxide (Al2O3), is 20 to 40% by mass, and preferably 25 to 35% by mass. When the content of aluminum (Al) in the glass powder according to the present embodiment, when converted into the amount of aluminum oxide (Al2O3), is 20% by mass or more, the curability of the two-agent dental polymerizable composition is furtherimproved when the glass powder according to the present embodiment is