Back to results
US 4,874,828 AGranted
Heat resistant thermosetting phosphazene-imide copolymers
AssigneeHercules Incorporated
InventorAlexander Lukacs, III
Life of this patent
Estimating the term…
Abstract
Novel thermoset polymers are prepared by reacting an allyl or vinyl aryl or aryloxy substituted cyclophosphazene with a bis-maleimide.
Claims4
A crosslinked thermoset polymer which comprises a heat-catalyzed reaction product of a bis-maleimide based dienophile and an aryl or aryloxy substituted cyclophosphazene wherein an average of at least two aryl or aryloxy groups are substituted with an allyl or vinyl group.
A crosslinked thermoset polymer which comprises a heat-catalyzed reaction product of a bis-maleimide based dienophile and a cyclophosphazene having the general formula:
- ##STR5## where n is 3 or 4 and R.sub.1 and R.sub.2 are the same of different and are selected from the group consisting of:
- ##STR6## where w=0 or 1, and R and R' are H or a nonreactive moiety, and the average degree of substitution per cyclophosphazene ring by R.sub.1 and R.sub.2 radicals selected from the group consisting of:
- ##STR7## is at least two.
Dependencies are inferred from the claim text.