Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-06-01
1999-09-21
Moore, Margaret
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
525478, 528 15, 528 31, 528 32, 528 39, 524588, 524493, 264 16, 433214, 106 3822, 106 35, A61K 610
Patent
active
059555130
ABSTRACT:
Improved very high viscosity (putty) two component polymerizable polyorganosiloxane composition for use in making dental impressions, having improved tear strength, handling and wettability. Improved tear strength results from inclusion of a quadri-functional polysiloxane having a vinyl content of 0.16 to 0.24 m-mole/g. Working time is maintained by including sufficient amounts of a retarder composition that delays onset of the vinyl polymerization. Handling is improved by the addition of a very high viscosity linear vinyl terminated polydimethylsiloxane which reduces tackiness and improves the shelf stability. Wettability is improved by including a surfactant resulting in a surface contact angle with water at three minutes of less than 50.degree.. The surfactant chosen has an HLB of 8-11, such that the wetting contact angle is achieved within less than two minutes and remains wetting throughout the working time of the impression taking, substantially improving the impression making process.
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American reports; Addendum to American National Standards Institute/American dental Association specification No. 19* for dental elastomeric impression material; JADA, vol. 105, Oct. 1982.
Bieber James B.
Dentsply Research & Development Corp.
Lovercheck Dale R.
Moore Margaret
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