Low polydispersity glycidyl azide polymer
AssigneeMinnesota Mining and Manufacturing Company
InventorBirger Johannessen
Life of this patent
Estimating the term…
Abstract
Epichlorohydrin is polymerized in the presence of anhydrous stannic chloride catalyst and an alcohol initiator to produce a polyepichlorohydrin product comprising predominantly secondary hydroxyl-terminated polyepichlorohydrin polymer having low polydispersity, from which polyurethanes and azide derivatives can be made, polyurethanes prepared from such azide derivatives being useful as a binder for solid rocket propellants.
Claims11
A normally liquid, polyglycidyl azide product said product being produced by reacting, with an inorganic azide, a polyepichlorohydrin product comprising predominantly secondary hydroxyl-terminated polyepichlorohydrin polymer having a number average molecular weight of at least 2000, and a polydispersity of less than 1.2, and essentially no non-hydroxyl functional cyclic ether oligomer;
- said polyepichlorohydrin product being made by polymerizing epichlorohydrin in the presence of anhydrous stannic chloride catalyst, a strong carboxylic acid co-catalyst, and an alcohol as an initiator.
A process for the preparation of polyglycidyl azide product, comprising reacting polyepichlorohydrin product with an inorganic azide, said polyepichlorohydrin product comprising predominantly secondary hydroxyl-terminated polyepichlorohydrin polymer having a number average molecular weight of at least 2000, and a polydispersity of less than 1.2, and essentially no non-hydroxyl functional cyclic ether oligomer;
- said polyepichlorohydrin product being made by polymerizing epichlorohydrin in the presence of anhydrous stannic chloride catalyst, a strong carboxylic acid co-catalyst, and an alcohol as an initiator.
Elastomeric polyurethane comprising the reaction product of polyisocyanate and a polyepichlorohydrin product having a number average molecular weight of at least 2000 and a polydispersity of less than 1.2, said product comprising predominantly secondary hydroxyl-terminated polyepichlorohydrin polymer and essentially no non-hydroxyl functional cyclic ether oligomer, said product being made by polymerizing epichlorohydrin in the presence of anhydrous stannic chloride catalyst, a strong carboxylic acid co-catalyst, and an alcohol as an initiator.
Dependencies are inferred from the claim text.