NOVEL COMBUSTIBLE CARTRIDGE CASE AND PROCESS THEREFOR

• US 3,706,280 A
• Filed: 12/29/1970
• Issued: 12/19/1972
• Est. Priority Date: 12/29/1970
• Status: Expired due to Term

• Current Assignee: Jack Bobinski, Jean P. Picard
• Original Assignee: Jack Bobinski, Jean P. Picard
• Inventors: Picard, Jean P., Bobinski, Jack
• Primary Examiner(s): Borchelt, Benjamin A.
• Assistant Examiner(s): Tudor, H. J.
• Application Number:
  US05/102,540
• Time in Patent Office: 721 Days
• Field of Search: 102/38,43,DIG.1 142/2 86/1
• US Class Current: 102/465
• CPC Class Codes: F42B 5/188 Manufacturing processes therefor
• CPC Class Codes: Y10S 102/70 Combustilbe cartridge

Abstract

Novel combustible cartridge cases of superior properties are obtained by impregnating a dry felted preform, produced from a mixture consisting essentially of a fibrous cellulosic material containing free hydroxyl groups and a highly combustible organic nitro compound in finely divided form, with an organic polyisocyanate or other water insoluble resin precursor capable of reacting with the cellulosic hydroxyl groups, and thereafter forming the water-insoluble resin in situ.

Claims

2. A mixture according to claim 1 wherein the water-insoluble resin formed amounts to from about 10 percent to about 50 percent by weight of the cartridge case.

3. A method according to claim 1 wherein the organic polyisocyanate is a polymethylene polyphenylisocyanate.

4. A method according to claim 1 wherein the organic polyisocyanate is employed in mixture with an organic polyol, the ratio of NCO groups to polyol hydroxyl groups being greater than about 1.5 to 1.

5. A method according to claim 1 wherein the fibrous cellulosic material is cellulose and the highly combustible organic nitro compound is nitrocellulose, the amount of nitro cellulose being at least equal to the weight of said cellulose.

6. A method according to claim 1 wherein the dried felted preform contains from about 10 percent to about 50 percent of pentaerythritol tetranitrate and the remainder consists essentially of nitrocellulose fibers.

7. A method according to claim 1 wherein the dried felted preform contains from about 50 percent to about 70 percent of pentaerythritol tetranitrate and the remainder consists essentially of cellulose fibers.

8. The product obtained by the method of claim 1.

9. The product obtained by the method of claim 2.

10. The product obtained by the method of claim 3.

12. The product obtained by the method of claim 5.

13. The product obtained by the method of claim 6.

14. The product obtained by the method of claim 9.

15. A method according to claim 4, wherein the organic polyol is diethylene glycol.

16. The product obtained by the method of claim 15.

17. The product obtained by the method of claim 4.