Foundry sandcore mold release composition
OwnerMark Gullo, Robert Moffett +2inventors
InventorsMark Gullo, Robert Moffett, Usha Gopalratnam, Leonard Testa
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Abstract
A release agent composition to facilitate separation of patterns and core boxes from foundry molds and cores comprising a cross-linkable fluorotelomer comprising repeat units derived from a fluoroalkene, a silicone intermediate, a catalyst, and a solvent or a hydroxy-terminated polyalkylsiloxane. Further is provided a method to improve the release properties of molds removed from a pattern or core box comprising applying a composition of the invention to the pattern or core box surface. A process for synthesizing a fluorotelomer or cotelomer from fluoroalkene monomers or comonomers is also provided.
Claims28
A method of easing the separation of a workpiece from a substrate comprising coating at least one of the workpiece and the substrate with a mold release agent selected from the group consisting essentially of:
- (a) a cross-linkable fluorotelomer comprising repeat units derived from a fluoroalkene monomer, and a silicone intermediate;
- (b) a cross-linkable fluorotelomer comprising repeat units derived from at least two fluoroalkene comonomers, and a silicone intermediate;
- (c) a hydroxy-terminated polyalkylsiloxane;
- and, optionally, a catalyst, cross-linking agent, and a solvent.
A telomerization process for preparing a fluorotelomer comprising combining a fluoroalkene monomer and optionally a comonomer in a hydrofluorocarbon solvent with a free radical initiator and at least one secondary alcohol or derivative thereof.
Dependencies are inferred from the claim text.