Polyalkylene Glycol-Grafted Polycarboxylate Suspension and Dispersing Agent for Cutting Fluids and Slurries
AssigneeDow Global Technologies LLC
InventorsYi-Ping Zhu, Wanglin Yu, Fang Li, Daniel A. Aguilar, Brad Wurm
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Abstract
Cutting fluids for brittle materials, e.g., silicon ingot, comprise, in weight percent: A. 70-99% polyalkylene glycol (PAG), e.g., polyethylene glycol; B. 0.01-10% PAG-grafted polycarboxylate; and C. 0-30% water. These cutting fluids are used with abrasive materials, e.g., silicon carbide (SiC), to form cutting slurries. The slurry is sprayed on the cutting tool, e.g., a wire saw, to cut a brittle work piece, e.g., a silicon ingot.
Claims17
1-13. (canceled)
A cutting fluid comprising in weight percent:
- A. 70-99% polyalkylene glycol (PAG) having a molecular weight of 100-1,000;
- B. 0.01-10% PAG-grafted polycarboxylate comprising a polycarboxylate structure and polyalkylene oxide units covalently bonded to the polycarboxylate structure, wherein the polycarboxylate structure comprises units derived from acrylic acid, maelic acid or methacrylic acid, and the weight percent of total polyalkylene oxide units in the PAG-g-polycarboxylate is at least 40%;
- and
- C. 0-30% water.
A cutting slurry comprising in weight percent:
- A. 25-75% PAG having a molecular weight of 100-1,000;
- B. 0.004-5% PAG-g-polycarboxylate comprising a polycarboxylate structure and polyalkylene oxide units covalently bonded to the polycarboxylate structure, wherein the polycarboxylate structure comprises units derived from acrylic acid, maleic acid or methacrylic acid and the weight percent of total polyalkylene oxide units in the PAG-g-polycarboxylate is at least 40%;
- C. 0-15% water;
- and
- D. 25-75% abrasive material.
A method of cutting a brittle material with a cutting wire, the method comprising the step of applying abrasive slurry to the wire as the brittle material is brought into contact with the wire, the abrasive slurry comprising:
- A. 25-75% PAG having a molecular weight of 100-1,000;
- B. 0.004-5% PAG-g-polycarboxylate comprising g a polycarboxylate structure and polyalkylene oxide units covalently bonded to the polycarboxylate structure, wherein the polycarboxylate structure comprises units derived from acrylic acid, maleic acid or methacrylic acid and the weight percent of total polyalkylene oxide units in the PAG-g-polycarboxylate is at least 40%;
- C. 0-15% water;
- and
- D. 25-75% abrasive material.
Dependencies are inferred from the claim text.