Organic polyacid/base reaction cement

Details Organic polyacid/base reaction cement Organic polyacid/base reaction cement

1998-07-30

2000-01-25

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

106426, C08K 900

Patent

active

060179821

ABSTRACT:
For making a cement such as a dental cement by reacting an organic polyacid (such as polyacrylic acid or polyvinylphosphonic acid or a copolymer of these) with an ion-leachable glass as the base, the invention offers a glass containing the cations Al, Si, Ca and Zn wherein Si:Al>1.5 and Zn is 30-70 percent of those cations. The glass is made by heat treating an aqueous paste of Al, Si, and Ca oxides, such as bentonite, with ZnO and a precursor of ZnO such as zinc acetate, whereby the zinc forms a layer on the glass and is also incorporated as a glass network former. The setting of the cement is speeded and sharpened by using around 2% MgCl.sub.2.

REFERENCES:
Biomaterials, vol. 15, No. 4, Mar. 1994, Guilford GB, pp. 299,306, XP000451122 M.Darling: "Novel polyakenoate (glass-ionomer) dental cements based on zinc silicate glasses" see p. 299, right-hand col., paragraph, 2-p. 301, left hand col., last paragraph.

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