Grinding aid formulations

• US 5,221,295 A
• Filed: 05/11/1992
• Issued: 06/22/1993
• Est. Priority Date: 05/11/1992
• Status: Expired due to Term

• Current Assignee: Norton Company (Compagnie De Saint-Gobain)
• Original Assignee: Norton Company (Compagnie De Saint-Gobain)
• Inventors: Zador, Eugene
• Primary Examiner(s): Bell, Mark L.
• Assistant Examiner(s): THOMPSON, WILLIE
• Application Number:
  US07/880,768
• Time in Patent Office: 407 Days
• Field of Search: 51/298, 51/306
• US Class Current: 51/298
• CPC Class Codes: B24D 3/344 the bonding agent being organic

Abstract

Coated abrasives provided with a coating comprising a grinding aid and a binder resin are particularly effective when the grinding aid is an halogenated hydrocarbon.

Claims

1. A grinding aid formulation comprising a water-insoluble, halogenated hydrocarbon grinding aid, having a halogen content of at least 50 wt. %, which is thermally stable up to about 400°

C. but is thermally unstable at about 600°

C., and a polymeric binder curing to a coherent film;

said formulation;

a) containing at least 50 wt. % of the grinding aid, based on the combined solids weight of the binder and the grinding aid, b) having a viscosity at 25°

C. of from 1000 to 12000 cps, and c) having a grinding quotient of at least 1.5.

2. A formulation according to claim 1 in which the halogenated hydrocarbon has a halogen content of at least 60 wt. %.

3. A formulation according to claim 1 in which the polymeric binder is selected from the group consisting of phenolic and epoxy resins.

4. A formulation according to claim 1 in which the viscosity is from 2000 to 6000 cps.

5. A formulation according to claim 1 in which the halogenated hydrocarbon is a chlorinated paraffin hydrocarbon with a molecular weight of from 600 to 1000 and a halogen content of at least 60 wt. % .

6. A formulation according to claim 1 in which the halogenated hydrocarbon is a polymer.

7. A formulation according to claim 6 in which the polymer is selected from the group consisting of polybromostyrene and a coplymer of vinylidene chloride, acrylonitrile and an acrylate monomer.

8. A formulation according to claim 1 in which the grinding aid represents at least 70 wt. % of the combined solids weight of the grinding aid and the binder.

9. A formulation according to claim 1 in which the halogenated hydrocarbon is selected from the group consisting of pentabromotoluene;

chlorendic anhydride;

hexabromocyclododecane;

dodecachloro dodecahydro dimethano dibenzo cyclooctene; and

chlorinated C₂₀ to C₃₀ hydrocarbons.

10. A formulation according to claim 1 in which the halogenated hydrocarbon selected undergoes more than 20% weight loss when heated at a temperature of 600°

C.

11. A formulation according to claim 10 in which the halogenated hydrocarbon loses more than 20% of its weight when heated at 500°

C.

12. A grinding aid formulation comprising a water-insoluble halogenated hydrocarbon having a halogen content of greater than about 60 wt. % which is thermally stable up to at least 400°

C. but begins to lose weight at below 600°

C. and which loses at least 80% of its weight when heated to 700°

C.; and

a polymeric binder curing to a coherent film and selected from epoxy resins and phenolic resins, the proportions of the components being such that the formulation has a viscosity at 25°

C. of from 2,000 to 6,000 cps, the halogenated hydrocarbon comprises at least 60 wt. % of the formulation solids, and the formulation has a grinding index of at least 2.

13. A formulation according to claim 12 in which the halogenated hydrocarbon is selected from the group consisting of pentabromotoluene;

chlorendic anhydride;

hexabromocyclododecane;

dodecachloro dodecahydro dimethano dibenzo cyclooctene; and

chlorinated C₂₀ to C₃₀ hydrocarbons.