Liquid phosphazene compositions
AssigneeEthyl Corporation
InventorsEdwin D. Hornbaker, Hsueh M. Li
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Abstract
Liquid, linear, crosslinkable phosphazene compositions and a process for their preparation are disclosed. These liquid compositions, prepared from normally solid polyphosphazene, contain the polyphosphazene in admixture with from about 1 to about 30 parts per hundred parts of polymer of a polythiol, a polyacrylate, a polymethacrylate or mixtures thereof such that the combination has a viscosity of less than 500,000 cps at 23.degree. C. These compositions are easily handled and can be crosslinked at ambient temperatures.
Claims15
In combination,
- (i) a normally solid or viscous linear, substituted, crosslinkable phosphazene polymer having a viscosity of greater than 500,000 cps at 23.degree. C., said polymer containing crosslinkable unsaturation in some of the substituents attached to the phosphorus atoms of said polymer, in admixture with
- (ii) from about 1 to about 30 parts per 100 parts of polymer of a curing agent selected from the group consisting of a polythiol, a polyacrylate, a polymethacrylate and mixtures thereof such that the combination has a viscosity of less than 500,000 cps at 23.degree. C.
A process for the preparation of a liquid, crosslinkable phosphazene combination which comprises,
- (i) admixing a normally solid or viscous linear, substituted, crosslinkable phosphazene polymer having a viscosity of greater than 500,000 cps at 23.degree. C., said polymer containing crosslinkable unsaturation in some of the substituents attached to the phosphorus atoms of said polymer, with an inert, low boiling, low molecular weight, organic solvent in an amount such that the viscosity of the resulting solution is less than about 500,000 cps at 23.degree. C.
- (ii) admixing said solution with from about 1 to about 30 parts per hundred parts of polymer of a curing agent selected from the group consisting of a polythiol, a polyacrylate, a polymethacrylate and mixtures thereof;
- and then
- (iii) removing said solvent, the resulting combination having a viscosity of less than 500,000 cps at 23.degree. C.
Dependencies are inferred from the claim text.