Thermosettable polymers or prepolymers prepared from polymethylated pyrazines and aromatic polyaldehydes and cured products therefrom
AssigneeThe Dow Chemical Company
InventorsDuane S. Treybig, Loren L. Swearingen
Life of this patent
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Abstract
Thermosettable prepolymers or resins are prepared by reacting a pyrazine containing at least two substituent groups which have a hydrogen atom attached to a carbon atom which is attached to the ring with a material containing at least two aromatic aldehyde groups. These prepolymers or resins are curable to thermoset products having good mechanical and thermal properties. Thermoset polymers having good mechanical and thermal properties are also prepared by homopolymerization in the presence of N,N'-bis-imides or copolymerization of these prepolymers with N,N'-bis-imides. The prepolymers are suitable for preparing composites.
Claims183
A thermosettable product which results from reacting (A) at least one pyrazine compound containing at least two substituent groups which have at least one hydrogen atom attached to a carbon atom which is attached to the ring or mixture of such pyrazines and (B) at least one of (1) at least one material having at least two aldehyde groups or (2) a mixture of (a) at least one aldehyde having at least two aldehyde groups and (b) at least one aldehyde having only one aldehyde group;
- wherein components (A) and (B) are employed in a mole ratio of (A):(B) of from about 0.25:1 to about 4:1.
A thermosettable product which results from reacting a pyrazine containing both methyl and aldehyde groups with itself.
A thermosettable product which results from reacting (A) a pyrazole, imidazole, pyridazine, pyrimidine, purine, pteridine, triazine, quinoline or quinoxaline compound or a mixture of any two or more such compounds having at least one substituent group which has a hydrogen atom attached to a carbon atom which is attached to the ring with the proviso that at least one of such pyrazole, imidazole, pyridazine, pyrimidine, purine, pteridine, triazine, quinoline or quinoxaline compounds has at least two substituent groups which have a hydrogen atom attached to a carbon atom which is attached to the ring with (B) at least one of (1) at least one material having at least two aldehyde groups or (2) a mixture of (a) at least one aldehyde having at least two aldehyde groups and (b) at least one aldehyde having only one aldehyde group;
- wherein components (A) and (B) are employed in a mole ratio of (A):(B) of from about 0.25:1 to about 4:1.
A thermosettable product resulting from reacting (A) a mixture of (1) at least one pyrazine compound having at least one substituent group which has a methyl group attached to a carbon atom which is attached to the ring and (2) at least one of pyrazole, imidazole, pyridazine, pyrimidine, purine, pteridine, triazine, quinoline or quinoxaline compounds having at least one substituent group which has a methyl group attached to a carbon atom which is attached to the ring with (B) at least one of (1) at least one material having at least two aldehyde groups or (2) a mixture of (a) at least one aldehyde having at least two aldehyde groups and (b) at least one aldehyde having only one aldehyde group;
- wherein a majority of the compounds of component (A) have at least two substituent methyl groups and components (A) and (B) are employed in quantities which provide a mole ratio of (A):(B) of from about 0.25:1 to about 4:1.
A thermosettable product which results from reacting (A) a mixture of pyrazine and pyridine having at least one substituent group which has a hydrogen atom attached to a carbon atom which is attached to the ring to act as a chain terminator, with the proviso that the majority of such pyrazine or pyridine compounds have at least two substituent groups which have a hydrogen atom attached to a carbon atom which is attached to the ring with (B) at least one of (1) at least one material having at least two aldehyde groups or (2) a mixture of (a) at least one aldehyde having at least two aldehyde groups and (b) at least one aldehyde having only one aldehyde group;
- wherein components (A) and (B) are employed in a mole ratio of (A):(B) of from about 0.25:1 to about 4:1.
A thermosettable product which results from reacting a pyridine, pyrazole, imidazole, pyridazine, pyrimidine, purine, pteridine, triazine, quinoline or quinoxaline compound or a mixture of any two or more such compounds having both at least one group which has a hydrogen atom attached to a carbon atom which is attached to the ring and at least one aldehyde group with itself or themselves.
A thermosettable product which results from reacting (A) at least one pyrazine compound having at least one methyl group and at least one aldehyde group with (B) at least one of pyridine, pyrazole, imidazole, pyridazine, pyrimidine, purine, pteridine, triazine, quinoline or quinoxaline compounds having at least one methyl group and at least one aldehyde group.
A thermosettable product which results from reacting (A) a pyrazine, pyrazole, imidazole, pyridazine, pyrimidine, purine, pteridine, triazine, quinoline or quinoxaline compound or a mixture of any two or more such compounds or a mixture of pyridine and any one or more of such compounds each such compounds and pyridine having at least one substituent group which has a hydrogen atom attached to a carbon atom which is attached to the ring with the proviso that at least one of such pyrazine, pyridine, pyrazole, imidazole, pyridazine, pyrimidine, purine, pteridine, triazine, quinoline or quinoxaline compounds has at least two substituent groups which have a hydrogen atom attached to a carbon atom which is attached to the ring with (B) at least one of (1) at least one material having at least two aldehyde groups or (2) a mixture of (a) at least one aldehyde having at least two aldehyde groups and (b) at least one aldehyde having only one aldehyde group;
- wherein components (A) and (B) are employed in a mole ratio of (A):(B) of from about 0.25:1 to about 4:1.
Dependencies are inferred from the claim text.