Patent GB-640167-A (GB)
Title: Precious stone abrasive compositions and the like
IPC: C09K3/14
Filed: 1947-06-27
Abstract: In an abrasive composition, abrasive particles are suspended in a water-soluble carrier comprising a highly-polymerized ethylene oxide and free fatty acid.  A glycol or polyglycol, preferably polypropylene glycol, is included as a wetting and dispersing agent for the abrasive particles constituted by diamond or other precious stone dust or the synthetic equivalent.  A soap may be included in order to plasticize the composition which can be made of varying consistency.  The abrasive grain is first dispersed in the glycol and is then poured into a molten mixture of the polymerized ethylene oxide, stearic acid, and soap, and allowed to cool while continuously agitated to maintain the abrasive in suspension.  A clear dye to indicate when grinding commences, or a compound such as cobalt chloride to indicate if the grinding - surface is becoming overheated, may be added.  Sodium silicate can also be incorporated. The Specification as open to inspection under Sect. 91 describes also a composition in which paraffin serves as the dispersing-agent and paraffin wax and petroleum jelly serve as the carrier.  This subject-matter does not appear in the Specification as accepted.ALSO:In an abrasive composition, abrasive particles are suspended in a water-soluble carrier comprising a highly-polymerized ethylene oxide and free fatty acid.  A glycol or polyglycol, preferably polypropylene glycol, is included as a wetting and dispersing agent for the abrasive particles constituted by diamond or other precious-stone dust or the synthetic equivalent.  A soap may be included in order to plasticize the composition which can be made of varying consistency.  The abrasive grain is first dispersed in the glycol and is then poured into a molten mixture of the polymerized ethylene oxide, stearic acid, and soap and allowed to cool while continuously agitated to maintain the abrasive in suspension.  A clear dye to indicate when grinding commences, or a compound such as cobalt chloride to indicate if the grinding surface is becoming over-heated may be added.  Sodium silicate can also be incorporated. The Specification as open to inspection under Sect. 91 describes also a composition in which paraffin serves as the dispersing agent and paraffin wax and petroleum jelly serve as the carrier. This subject-matter does not appear in the Specification as accepted.ALSO:In an abrasive composition, abrasive particles are suspended in a water-soluble carrier comprising a highly polymerized ethylene oxide and free fatty acid.  A glycol or polyglycol, preferably polypropylene glycol, is included as a wetting and dispersing agent for the abrasive particles constituted by diamond or other precious-stone dust or the synthetic equivalent.  A soap may be included in order to plasticize the composition which can be made of varying consistency.  The abrasive grain is first dispersed in the glycol and is then poured into a molten mixture of the polymerized ethylene oxide, stearic acid, and soap, and allowed to cool while continuously agitated to maintain the abrasive in suspension.  A clear dye, to indicate when grinding commences, or a compound such as cobalt chloride to indicate if the grinding-surface is becoming overheated may be added.  Sodium silicate can also be incorporated. The Specification as open to inspection under Sect. 91 describes also a composition in which paraffin serves as the dispersing-agent and paraffin wax and petroleum jelly serve as the carrier.  This subject-matter does not appear in the Specification as accepted.