Claims
- 1. A method of producing a shape-retentive compacted article from 1,3-dibromo-5,5-dimethylhydantoin particulate solids, which method comprises:a) granulating 1,3-dibromo-5,5-dimethylhydantoin particulate solids without use of a binder, and b) pressure compacting granulated 1,3-dibromo-5,5-dimethylhydantoin granules formed in a) that have a U.S. standard mesh size in the range of about 80 mesh to about 3 mesh, again without use of a binder.
- 2. A method of claim 1 wherein said 1,3-dibromo-5,5-dimethylhydantoin particulate solids used in a) cannot be successfully converted without granulation as in a) into a shape-retentive tablet that does not delaminate or break when released from the die in a procedure in which a five-gram sample of such solids is manually placed into a die of Hastelloy C alloy that has been lightly dusted with micronized polypropylene wax, and is pressure compacted in the die at 5000 psi into a 0.71-inch diameter circular tablet, with no dwell time.
- 3. A method of producing a shape-retentive compacted article from 1,3-dibromo-5,5-dimethylhydantoin particulate solids, which method comprises:a) compressing 1,3-dibromo-5,5-dimethylhydantoin particulate solids in the absence of a binder into a sheet of a thickness in the range of about {fraction (1/16)} inch to about ½ inch; b) subdividing such sheet into particles comprising particles in the range of about 80 mesh to about 3 U.S. standard mesh size; and c) pressure compacting particles from b) in the range of about 80 mesh to about 3 U.S. standard mesh size in a die in the absence of a binder mixed therewith.
- 4. A method of claim 3 wherein said particles in b) and in c) are in the range of about 30 mesh to about 8 U.S. standard mesh size.
- 5. A method of claim 3 or 4 wherein the compression in a) is conducted with the application of compression pressure in the range of about 1000 to about 30,000 psi.
- 6. A method of claim 3 or 4 wherein the compression in a) is conducted with the application of compression pressure in a set of compression rolls in the range of about 5000 to about 25,000 psi.
- 7. A method of claim 3 or 4 wherein the particles formed in b) are classified into (1) a fraction containing the particles in the size range of b), and (2) either or both of (i) and (ii), where (i) is a fraction composed of the larger particles, and (ii) is a fraction composed of the smaller particles.
- 8. A method of claim 7 where a fraction of (i) if it exists, is recycled to b), and a fraction of (ii) if it exists, is recycled to a).
- 9. A pressure compacted article formed from non-compactible 1,3-dibromo-5,5-dimethylhydantoin without use of any binder, said article produced by a method comprising:a) granulating 1,3-dibromo-5,5-dimethylhydantoin particulate solids without use of a binder, and b) pressure compacting granulated 1,3-dibromo-5,5-dimethylhydantoin granules formed in a) that have a U.S. standard mesh size in the range of about 80 mesh to about 3 mesh, again without use of a binder.
- 10. A pressure compacted article formed from non-compactible 1,3-dibromo-5,5-dimethylhydantoin without use of any binder, said article produced by a method comprising:a) compressing 1,3-dibromo-5,5-dimethylhydantoin particulate solids in the absence of a binder into a sheet of a thickness in the range of about {fraction (1/16)} inch to about ½ inch; b) subdividing such sheet into particles comprising particles in the range of about 80 mesh to about 3 U.S. standard mesh size; and c) pressure compacting particles from b) in the range of about 80 mesh to about 3 U.S. standard mesh size in a die in the absence of a binder mixed therewith.
- 11. An article of claim 10 wherein said particles in b) and in c) are in the range of about 30 mesh to about 8 U.S. standard mesh size.
- 12. An article of claim 10 wherein the compression in a) is conducted with the application of compression pressure in the range of about 1000 to about 30,000 psi.
- 13. An article of claim 10 wherein the compression in a) is conducted with the application of compression pressure in a set of compression rolls in the range of about 5000 to about 25,000 psi.
- 14. A pressure compacted article of any of claims 9-13 inclusive, having a crush strength in the range of about 15 to about 70 pounds per inch of thickness.
REFERENCE TO OTHER APPLICATIONS
Commonly-owned copending application Ser. No. 09/484,844, filed Jan. 18, 2000, by one of us and some of our colleagues, describes and claims chemical processes for producing, inter alia, 1,3-dibromo-5,5-dimethylhydantoin in the form of particulate solids which can be pressure-compacted without use of a binder. Commonly-owned copending application Ser. No. 09/484,687, filed Jan. 18, 2000, by us and some of our colleagues, describes and claims 1,3-dibromo-5,5-dimethylhydantoin particulate solids producible by the processes of application Ser. No. 09/484,844, such solids having unprecedented enhanced properties, and compacted articles made from such particulate solids without use of a binder. Commonly-owned copending application Ser. No. 09/487,816, filed Jan. 18, 2000, by us relates in part to converting 1,3-dihalo-5,5-dimethylhydantoins into compacted articles using novel binders. Commonly-owned copending application Ser. No. 09/484,938, filed Jan. 18, 2000, by one of us and some of our colleagues, describes and claims methods for effecting efficacious microbiological control utilizing 1,3-dibromo-5,5-dimethylhydantoin in novel compacted or non-compacted forms. Commonly-owned copending application Ser. No. 09/484,891, filed Jan. 18, 2000, by one of us relates to the compacting of 1,3-dihalo-5,5- dimethylhydantoins other than 1,3-dibromo-5,5-dimethyl-hydantoin without use of binders, and to the novel compacted forms so produced.
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