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US 4,221,895 AGranted
Thermally resistant thermosetting aromatic polymers containing pendant 1-alkynyl substituents
AssigneeThe Dow Chemical Company
InventorEdmund P. Woo
Life of this patent
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Abstract
Thermally resistant thermoset polymers are formed by heating a thermosetting aromatic prepolymer having at least two pendant alkynyl groups, e.g., a thermosetting prepolymer represented by the formula: ##STR1## The resulting thermoset polymers are sufficiently resistant to heat to be usefully employed as engine parts in the internal combustion engines of automobiles and the like.
Claims12
An aromatic thermosetting prepolymer consisting essentially of repeating units of the formula:
- --YAr--
- wherein each Ar is independently an aromatic group essentially free of acyclic aliphatic carbon-to-carbon bonds provided that at least two of Ar have pendant 1-alkynyl substituents and each Y is independently ##STR19## said prepolymer being curable upon application of heat to form a heat-resistant thermoset polymer.
An aromatic thermosetting prepolymer represented by the formula:
- Ar--YAr].sub.n YAr
- wherein each Ar is independently an aromatic group essentially free of acyclic aliphatic carbon-to-carbon bonds provided that at least two of Ar have pendant 1-alkynyl substituents;
- each Y is independently:
- ##STR20## and n is zero or an integer from 1 to about 18, said prepolymer being curable upon the application of heat to form a thermoset polymer having thermal oxidative stability at temperatures up to about 250.degree. C.
1 more element
Dependencies are inferred from the claim text.