Water dispersible moulds
First Claim
1. A water-dispersible mould for making a casting, the mould comprising a water-insoluble particulate material and a binder therefor, wherein the binder contains at least one matrix former selected from the group consisting of polyphosphate chains derived from water-soluble phosphate glass and borate ions.
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Accused Products
Abstract
A water dispersible mould for making a casting, the mould comprising a water-insoluble particulate material-and a binder therefor, the binder including polyphosphate chains and/or borate ions. The invention also provides a process for making a water dispersible mould for making a casting, the process including the steps of: (a) providing a water-insoluble particulate material; (b) combining the particulate material with a binder including polyphosphate chains and/or borate ions, the chains and/or ions being dissolved in water; (c) forming, either during or after step (b), the particulate material and binder mixture into a desired shape; and (d) removing free water from the mixture. The polyphosphate chains may be derived from a water soluble phosphate glass and the borate ions may be derived from a soluble borate glass.
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Citations
36 Claims
- 1. A water-dispersible mould for making a casting, the mould comprising a water-insoluble particulate material and a binder therefor, wherein the binder contains at least one matrix former selected from the group consisting of polyphosphate chains derived from water-soluble phosphate glass and borate ions.
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14. A process for making a water dispersible mould for making a casting, the process including the steps of:
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(a) providing a water-soluble particulate material; (b) combining the particulate material with a binder wherein said binder contains at least one matrix former selected from the group consisting of polyphosphate chains derived from a water-soluble phosphate glass and borate ions, said at least one matrix former being dissolved in water; (c) forming, either during or after step (b), the particulate material and binder mixture into a desired shape; and (d) removing free water from the mixture. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A process for making a water dispersible mould for making a casting, the process including the steps of:
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(a) providing a water-insoluble particulate material; (b) combining the particulate material with a binder wherein said binder is derived from water and at least one glass selected from the group consisting of water soluble phosphate glass and water-soluble borate glass; (c) forming, either during or after step (b), the particulate material and binder mixture into a desired shape; and (d) removing free water from the mixture.
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Specification