Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-10-29
2000-05-16
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
A61F 200
Patent
active
060638311
ABSTRACT:
A method for using dental acrylic resins, the method comprising mixing a liquid monomer of methyl methacrylate with a polymer powder of methyl methacrylate, forming the mixture into an arbitrary shape by molding, filling, applying or other means, and then polymerizing and curing the formed mixture, wherein organic compounds selected from acryloyl morpholine, a coumarone resin, vinyl stearate, polyvinyl acetate, and alcoholic surfactants are previously added to the liquid monomer as a shrinkage controlling agent for lowering a curing shrinkage caused by the polymerization, is disclosed. According to the invention, not only the curing shrinkage rate of the curing shrinkage generated at the time of polymerization can be readily lowered to 0.3% or less, but also the method of the invention can be applied to a denture, a denture base, a casting pattern, fillers or cements as in the conventional techniques.
REFERENCES:
patent: 3836153 (1974-09-01), Dance
patent: 4001939 (1977-01-01), Gross
patent: 4268639 (1981-05-01), Seidel
patent: 4361528 (1982-11-01), Ginsberg
patent: 4670208 (1987-06-01), Koblischek
patent: 5869557 (1999-02-01), Landru
Joshin Kazuhiko
Kubo Fuminobu
GC Corporation
Michl Paul R.
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