# Patent

## Title
Gun oil composition

## Abstract

A gun oil composition consisting essentially of:

    
    
        2.0 to 15% by weight of isopropanol;
        20 to 60% by weight of heptane or a petroleum distillate;
        3 to 20% by weight of a mixture of viscosity modifiers, antioxidants and reducing agents including benzyl acetate, t-dibutyl-p-cresol, at least one alkyl succinic acid, at least one zinc alkyl thiophosphate, polymethacrylate, and methyl silicone polymer, wherein the alkyl is C1 to C6 alkyl; and
        the balance, lube oil bright stock to 100% by weight.

## Background
FIELD OF THE INVENTION
The present invention relates to an improved gun oil composition and a method of treating a gun and particularly the firing mechanism of a gun to maintain that mechanism in optimum operative condition.
BACKGROUND OF THE INVENTION
In my prior U.S. Pat. No. 4,113,633, I have disclosed a penetrating oil composition which essentially consists of a blend of lower alkyl benzene, lower alkanols, alkyl succinic acid, tert-dibutyl-p-cresol, zinc dialkyl thiophosphate, polymethacrylate and methyl silicone in a paraffin bright stock lube oil base.
The product was a highly successful long-acting penetrating oil which, after penetration, left a liquid film of sufficient tenacity and film strength to protect the lubricated surfaces from rusting.
The product was especially effective where metal structures had rusted to loosen the rust-frozen area and then to protect them against further rusting. Key to this composition was a methyl benzene component which consisted of toluene and xylene, usually in a ratio of about 2.5:1.
Over the years it has been found that the high toluene and xylene levels could not be tolerated by all users and that the composition was capable of improvement, especially for use as a gun oil.
OBJECTS OF THE INVENTION
It is, therefore, the principal object of the present invention to provide an improved gun oil composition which is free from drawbacks of the earlier composition, is more advantageous for use with gun mechanisms, i.e. the mechanisms of revolvers, rifles and automatic weapons, and which has improved penetrating action and lubricating action by comparison with earlier compositions.
It is also an object of the invention to provide an improved method of maintaining the operability of gun mechanisms is in substantially all environments.
SUMMARY OF THE INVENTION
These objects and others which will become apparent hereinafter are attained, in accordance with the invention, with a gun oil composition consisting essentially of:
2.0 to 15% by weight of isopropanol;
20 to 60% by weight of heptane or a petroleum distillate selected from the group which consists of:
solvent refined light paraffinic distillate CAS No. 64741-89-5,
solvent refined heavy paraffinic distillate CAS No. 64741-88-4,
hydrotreated heavy naphthenic distillate CAS No. 64742-52-5,
hydrotreated light naphthenic distillate CAS No. 64742-53-61,
solvent dewaxed heavy paraffinic distillate CAS No. 64742-65-0,
solvent dewaxed light paraffinic distillate CAS No, 64742-56-9,
hydrotreated lubricating oil CAS No. 72623-83-7,
solvent refined heavy naphthenic distillate CAS No. 64741-96-4, and
hydrotreated heavy paraffinic distillate CAS No. 64742-54-7;
3 to 20% by weight of a mixture of viscosity modifiers, antioxidants and reducing agents including benzyl acetate, t-butylcresol, at least one alkyl succinic acid, at least one zinc alkyl thiophosphate, polymethacrylate, and methyl silicone polymer, wherein the alkyl is C1 to C6 alkyl; and
the balance, lube oil bright stock to 100% by weight.
Preferably the mixture in this composition of viscosity modifiers, antioxidents and reducing agents comprises:
benzyl acetate,
t-dibutyl-p-cresol,
alkylsuccinic acid,
zinc alkyl thiophosphate,
polymethacrylate, and
methyl silicone polymer
in a weight ratio of substantially: 1.2:0.8:0.4:1.0:1.9:1.0.
The mixture is present preferably in the composition in a percent by weight of substantially 6.3 but can be present in an amount as small as 3.1 percent by weight to 18.9 percent by weight in an advantageous aspect of the invention. The isopropanol should be present in an amount between 2.1 and 12.5 weight percent and more preferably between 2.1 and 10.0 weight percent. The preferred hydrocarbon is heptane although certain petroleum distillates can be used as described above with their Chemical Abstract Service (CAS) numbers.
The composition is used as a conventional gun oil for lubricating gun mechanisms and may be applied to all of the metal surfaces of a gun to form a protective and lubricating film thereon, to loosen parts which have rusted or otherwise seized and to enable rust to be wiped away from the weapon.


SPECIFIC EXAMPLE
The compositions of the following table are made:













Example
















1
2
3
4
5
6
7
8



















Isopropanol
10.0
2.1
3.7
4.3
5.5
7.0
8.2
12.5


Heptane
30.0
26.5
40.0
35.0
20.0
23.4
28.8


Benzyl acetate
1.5
1.2
1.2
2.4
3.6
1.2
0.6
1.2


t-dibutyl-p-cresol
1.0
0.8
0.8
1.6
2.4
0.8
0.4
0.8


Alkylsuccinic acid
0.6
0.4
0.4
0.8
1.2
0.4
0.2
0.4


Zinc dialkyl thiophosphate
1.4
1.0
1.0
2.0
3.0
1.0
0.5
1.0


Polymethacrylate
2.2
1.9
1.9
3.8
5.7
1.9
0.9
1.9


Methyl silicone polymer
1.4
1.0
1.0
2.0
3.0
1.0
0.5
1.0


Lube oil bright stock (to 100%)
51.9
65.1
50.0
48.1
55.6
63.3
59.9
31.2


Petroleum Distillate (and/or heptane)







50.0









The compositions are formed by mixing and can be applied to the gun as a conventional gun oil.

## Claims

1. A gun oil composition consisting essentially of:
















isopropanol
 3.7%



Heptane
40.0



Benzyl acetate
 1.2



t-dibutyl-p-cresol
 0.8



Alkylsuccinic acid
 0.4



Zinc dialkyl thiophosphate
 1.0



Polymethacrylate
 1.9; and



Methyl Silicone Polymer
 1.0, balance lube oil bright



stock to 100%.

2. A method of maintaining a gun having metal parts including a firing mechanism, comprising the step of applying to said metal parts a gun oil composition consisting essentially of:













isopropanol
 3.7%


Heptane
40.0


Benzyl acetate
 1.2


t-dibutyl-p-cresol
 0.8


Alkylsuccinic acid
 0.4


Zinc dialkyl thiophosphate
 1.0


Polymethacrylate
 1.9; and


Methyl Silicone Polymer
 1.0, balance lube oil bright


stock to 100%.