Investment casting compositions and processes for the manufacture and use thereof
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsSandra A. Caster, Clayton E. Higginbotham
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Abstract
This invention relates to investment casting compositions comprising (i) a refractory material, e.g., a ceramic material, and (ii) a soluble core material comprising one or more block polymers characterized by an ABCBA structure. This invention also relates to methods for investment casting and to the manufacture of molded articles. The soluble core materials exhibit desirable breaking strength, dissolution rate and surface characteristics.
Claims18
An investment casting composition comprising (i) a refractory material and (ii) a soluble core material comprising one or more block polymers characterized by an ABCBA structure wherein:
- (1) A blocks or segments can be represented as follows:
- [R.sub.20 --]
- wherein R.sub.20 is the same or different and is an organic residue of an organic compound having at least one active hydrogen;
- (2) B blocks or segments can be represented as follows:
- [--CHR.sub.21 --CHR.sub.22 O--].sub.m
- wherein R.sub.21 and R.sub.22 are the same or different and are hydrogen, alkyl, hydroxy-substituted alkyl, or halo-substituted alkyl, and m is an integer of 1 or greater;
- and
- (3) C blocks or segments can be represented as follows:
- [--R.sub.23 --]
- wherein R.sub.23 is an organic residue of an epoxide containing two or more epoxy groups.
Dependencies are inferred from the claim text.