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US 5,955,629 AGranted
Energetic binders
AssigneeCordant Technologies Inc.
InventorsJ. B. Canterberry, W. H. Graham
Life of this patent
Estimating the term…
Abstract
Liquid nitromalonate polyesters and methods for their preparation are disclosed. Solid propellants are provided which employ as the binder a nitromalonate polyester. These propellants are resistant to plasticizer syneresis and crystallization and provide an increase in the specific impulse of the propellant.
Claims7
A method of preparing a nitromalonate polyester comprising:
- A. reacting malonic acid or a derivative thereof and a slight excess of a diol to form a hydroxy-terminated malonate polyester of the formula:
- ##STR42## wherein R.sup.4 is alkyl;
- n is at each independent occurrence an integer from 1 to about 40;
- and
- x is an integer;
- B. end-capping the hydroxy-terminated malonate polyester formed in step A with a cyclic anhydride to form a malonate polyester of the formula:
- ##STR43## wherein R.sup.4, n, x, a and b are as previously defined;
- and
- R.sup.5 is --CH.dbd.CH-- or --CH.sub.2 CH.sub.2 --;
- and
- C. nitrating the product of step B with HNO.sub.3 to produce a nitromalonate polyester of the formula:
- ##STR44## wherein R.sup.4, n, x, a, b and R.sup.5 are as previously defined.
9 more elements
A method of preparing a nitromalonate polyester comprising:
- A. reacting malonic acid or a derivative thereof and a slight excess of a diol to form a hydroxy-terminated malonate polyester having the formula:
- ##STR45## wherein R.sup.4 is alkyl;
- n is at each independent occurrence an integer from 1 to about 40;
- x is an integer;
- and
- a is 0 or 1, b is 1 or 2 and a+b=2;
- B. end-capping the hydroxy-terminated malonate polyester formed in step A with a cyclic anhydride to form a malonate polyester of the formula:
- ##STR46## wherein R.sup.4, n, x, a and b are as previously defined;
- and
- R.sup.5 is --CH.dbd.CH-- or --CH.sub.2 CH.sub.2 --;
- C. reacting the product formed in step B with formaldehyde to form a hydroxy-methylated malonate polyester of the formula:
- ##STR47## wherein R.sup.4, n, x, a, b and R.sup.5 are as previously defined;
- and D. nitrating the product of step C with HNO.sub.3 to produce a nitromalonate polyester of the formula:
- ##STR48## wherein R.sup.4, n, x, a, b and R.sup.5 are as previously defined.
11 more elements
Dependencies are inferred from the claim text.