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AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britian and Northern Ireland
InventorsMichael Burnup, Gerard F. Hayes, Norman C. Paul
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Plasticized cellulose polymers comprise a base polymer having a chain of .beta.-anhydroglucose units joined by ether linkages and having ether substituents, with at least one of the units being additionally substituted, by esterification of at least one hydroxyl group, by at least one ester group, which contains at least two carbon atoms and is chemically unreactive. Preferably the ester group contains four or more, most preferably five, carbon atoms. The carbon chains of the ester groups may be straight or branched. These internally plasticized celluloses may be prepared by, for example, reacting the base polymer with a carboxylic acid in xylene or with an acid chloride or anhydride in pyridine. They are useful in particular as inhibitor coatings for rocket motor propellants and in general wherever cellulose polymers are employed.
An inhibitor-coated rocket motor propellant wherein the inhibitor comprises a cellulose ether ester polymer consisting essentially of a base polymer, having a chain of .beta.-anhydroglucose units joined by ether linkages and having ether substituents wherein at least one of the .beta.-anhydroglucose units in the chain of the base polymer is additionally substituted, by esterification of at least one hydroxyl group on the chain, by at least one organic group which contains at least two carbon atoms and is selected from the group consisting of ester groups which contain no functional groups and ester groups which contain non-cross-linking functional groups that do not react with each other or with the cellulose ether ester polymer chain.
A method for preparing an inhibitor-coated rocket motor propellant wherein the inhibitor comprises a cellulose ether ester polymer consisting essentially of a base polymer, having a chain of .beta.-anhydroglucose units joined by ether linkages and having ether substituents wherein at least one of the .beta.-anhydroglucose units in the chain of the base polymer is additionally substituted, by esterification of at least one hydroxyl group on the chain, by at least one organic group which contains at least two carbon atoms and is selected from the group consisting of ester groups which contain no functional groups and ester groups which contain non-cross-linking functional groups that do not react with each other or with the cellulose ether ester polymer chain, said method comprising the steps of:
A method for preparing an inhibitor-coated rocket motor propellant wherein the inhibitor comprises a cellulose ether ester polymer consisting essentially of a base polymer, having a chain of .beta.-anhydroglucose units joined by ether linkages and having ether substituents wherein at least one of the .beta.-anhydrocglucose units in the chain of the base polymer is additionally substituted, by esterification of at least one hydroxyl group on the chain, by at least one organic group which contains at least two carbon atoms and is selected from the group consisting of ester groups which contain no functional groups and ester groups which contain non-cross-linking functional groups that do not react with each other or with the cellulose ether ester polymer chain, said method comprising the steps of:
Dependencies are inferred from the claim text.