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US 5,961,250 AGranted
Substance mixture for cofferdam material, cofferdam material, and the use and preparation thereof
AssigneeRoeko GmbH & Co., Dentalerzeugnisse
InventorWerner Mannschedel
Life of this patent
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Abstract
The invention relates to a substance mixture for a material for a cofferdam, to the material, and to the use and preparation thereof.
Claims17
A cofferdam obtained by vulcanization of a mixture comprised of:
- (a) from 56 to 96% by weight of a silicone rubber polymer,
- (b) from 44 to 4% by weight of a silicic acid filler,
- (c) from 1 to 7% by weight of a liquid or solid silicone oil based on (a) and (b) as 100% and
- (d) from 0.1 to 1.1% by weight of a liquid or solid radical forming cross-linking agent to be in admixture with components (a) to (c) or to be separate therefrom.
1 more element
A cofferdam obtained by a process which comprises the steps of:
- (i) forming a premix of:
- (a) from 56 to 96% by weight of a silicone rubber polymer,
- (b) from 44 to 4% by weight of a silicic acid filler and
- (c) from 1 to 7% by weight of a silicone oil based on (a) and (b) as 100%;
- (ii) optionally incorporating into the premix from 0.1 to 1.1% by weight of a cross-linking agent based on (a) and (b) as 100%;
- (iii) subjecting the resulting mixture to hot vulcanization under pressure;
- (iv) subjecting the resulting vulcanisate to a heat treatment, and
- (v) processing the heat-treated vulcanisate to form a cofferdam.
5 more elements
Dependencies are inferred from the claim text.