Combustible cartridges

Claim 2

The article of claim 2 wherein the nitrocellulose has incorporated therein monomethyl sodium siliconate.

Claim 3

The article of claim 2 wherein the siloxane resin contains from 3 to 20 mol percent of ketoxime siloxy units.

Claim 4

An article in accordance with claim 4 wherein the organosiloxane resin consists essentially of a. 5 to 25 inclusive mol percent of diorganosiloxane units wherein the diorganosiloxane units are bonded through silicon-oxygen-silicon linkages to form a diorganosiloxane block having an average of from 6 to 15 inclusive siloxy units per block, the polydiorganosiloxane being at least 90 mol percent dimethylsiloxane or phenylmethylsiloxane units any remaining units being selected from the group consisting of phenylmethylsiloxane and monomethylsiloxane units; b. 50 to 75 inclusive mol percent organosiloxane units of the general formula R''''xSiO4 x/2 wherein x has a value of from 1 to 1.3 inclusive and R'''' is selected from the group consisting of methyl, ethyl, propyl and phenyl radicals, at least 50 mol percent of the R'''' substituents being phenyl radicals, the organosiloxane units comprising a block of at least 3 siloxane units, the siloxane units being selected from the group consisting of monoorgano-and diorganosiloxy units; and c. 3 to 20 inclusive mol percent of endblocking ketoxime siloxane units of the formula R''''''Si(O-N X'')yO3 y/2 in which y has a value of from 1.8 to 2 inclusive, R'''''' is an organic radical selected from the group consisting of alkyl Radicals having from one to five inclusive carbon atoms, phenyl radicals and vinyl radicals and X'' is selected from the group consisting of Q2 and Q''C in which each Q radical is independently selected from the group consisting of monovalent hydrocarbon radicals and monovalent halogenated hydrocarbon radicals and Q'' is a divalent hydrocarbon radical; the mol percentages of (a), (b) and (c) being based on the total number of siloxane units present.

Claim 5

An article in accordance with claim 5 wherein the resin is terminated with monomethyldi(methylethylketoxime)siloxy units.

Claim 6

In a combustible cartridge having a porous casing composed of fiber-reinforced nitrocellulose which forms an exterior cartridge surface; the improvement consisting essentially of: a. a water repellent organosilicon compound incorporated into said casing in an amount sufficient to render said casing substantially impermeable to liquid water, said organosilicon compound being selected from the group consisting of alkali metal salts of a monoorganosiliconate in which the organic group is a lower alkyl radical of from one to three inclusive carbon atoms, and silanes of the formula RnSiX4 n and water-soluble hydrolyzates thereof, in which R is a monovalent hydrocarbon radical of from 1 to 30 carbon atoms, X is a hydrolyzable group and n is an integer having a value of 1 to 3 inclusive; and b. a continuous coating on the exterior casing surface of a room temperature curable organosiloxane resin having an average of from 1.2 to 1.8 organic groups per silicon atom, at least 80 mol percent of said organic groups being selected from the group consisting of lower alkyl radicals and the phenyl radical, any remaining organic groups being selected from the group consisting of alkoxy radicals of from one to four carbon atoms, acyloxy radicals of no more than eight carbon atoms and ketoxime radicals.

Claim 7

A cartridge in accordance with claim 7 wherein the coating (b) is cured.

Claim 8

A cartridge in accordance with claim 7 wherein the organosilicon compound (a) is incorporated by means of impregnating the casing with an aqueous solution of an alkali metal salt of a monoorganosiliconate in which the organic group is a lower alkyl of one to three inclusive carbon atoms.

Claim 9

A cartridge in accordance with claim 9 wherein the organosilicon compound is monomethyl sodium siliconate.

Claim 10

A cartridge in accordance with claim 9 wherein the organosiloxane resin contains ketoxime radicals.

Claim 11

A cartridge in accordance with claim 11 wherein the organosiloxane resin consists essentially of a. 5 to 25 inclusive mol percent of diorganosiloxane units wherein the diorganosiloxane units are bonded through silicon-oxygen-silicon linkages to form a diorganosiloxane block having an average of from 6 to 15 inclusive siloxy units per block, the polydiorganosiloxane being at least 90 mol percent dimethylsiloxane or phenylmethylsiloxane units any remaining units being selected from the group consisting of phenylmethylsiloxane and monomethylsiloxane units; b. 50 to 75 inclusive mol percent organosiloxane units of the general formula R''''xSiO4 x/2 wherein x has a value of from 1 to 1.3 inclusive and R'''' is selected from the group consisting of methyl, ethyl, propyl and phenyl radicals, at least 50 mol percent of the R'''' substituents being phenyl radicals, the organosiloxane units comprising a block of at least 3 siloxane units, the siloxane units being selected from the group consisting of monoorgano- and diorganosiloxy units; and c. 3 to 20 inclusive mol percent of endblocking ketoxime siloxane units of the formula R''''''Si(O-N X'')yO3 y/2 in which y has a value of from 1.8 to 2 inclusive, R'''''' is an organic radical selected from the group consisting of alkyl radicals having from one to five inclusive carbon atoms, phenyl radicals and vinyl radicals and X'' is selected from the group consisting of Q2 and Q''C in which each Q radical is independently selected from the group consisting of monovalent hydrocarbon radicals and monovalent halogenated hydrocarbon radicals and Q'' is a divalent hydrocarbon radical; the mol percentages of (a), (b) and (c) being based on the total number of siloxane units present.

Claim 12

A cartridge in accordance with claim 12 wherein the resin is terminated with monomethyldi(methylethylketoxime)siloxy units.