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US 4,906,708 AGranted
Process for increasing the melt viscosity and/or melt elasticity of polyamides with aryl phosphoryl azide
AssigneeAllied-Signal Inc.
InventorsHimangshu R. Bhattacharjee, Yash P. Khanna
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Abstract
A process for decreasing the melt index and increasing the melt viscosity and melt elasticity of polyamide by adding thereto an effective amount of an aryl phosphoryl azide compound as for example diphenyl phosphoryl azide, and thereafter heating the composition until the desired changes in melt index, melt viscosity and melt elasticity are attained.
Claims19
A process for improving the properties of a polyamide which comprises the steps of:
- (a) forming an intimate mixture of a polyamide and an effective amount of one or more aryl phosphoryl azide compounds of the formula:
- ##STR4## wherein:
- R.sub.1 is selected from the group consisting of phenyl or phenyl substituted with one or more substituents which are inert under process conditions;
- and
- R.sub.2 is selected from the group consisting of R.sub.1 substituents, haloalkyl, alkyl, a metal or non-metal cation and hydrogen;
- and
- (b) heating said mixture for a period of time and at a temperature sufficient to decrease the melt index and increase the melt viscosity and melt elasticity of said polyamide.
4 more elements
Dependencies are inferred from the claim text.