摘要:
Thermosettable prepolymers or resins are prepared by reacting (1) a pyrazine compound containing at least two substituent groups which have a hydrogen atom attached to a carbon atom which is attached to the ring such as tetramethylpyrazine, (2) a material containing at least two aromatic aldehyde groups, and (3) at least one of (a) a nitrogen containing aromatic heterocyclic compound containing at least one hydrogen atom attached to a carbon atom attached to the ring and a polymerizable unsaturated group such as 2-methyl-5-vinylpyridine or (b) an aldehyde containing at least one polymerizable unsaturated group such as 4-isopropenyl-1-cyclohexane-1-carboxaldehyde. These prepolymers or resins are curable to thermoset products having good mechanical and thermal properties by heat and pressure or by homopolymerization or copolymerization with N,N'-bis-imides such as 1,1'-(methylenedi-4,1-phenylene)bismaleimide. The prepolymers are suitable for preparing composites.
摘要:
A process for the preparation of 4-(2-hydroxyalkyl)-2-piperazinones and their substituted derivatives comprising reacting an N-hydroxyalkylalkylenediamine, e.g.2-[(2-aminoethyl)amino]ethanol, or a hydrocarbyl substituted derivative thereof with an .alpha.,.beta.-dicarbonyl compound, e.g. glyoxal, an alkyl-substituted derivative of glyoxal or a glyoxal equivalent. Certain hexahydro-4-(hydroxyalkyl)-2H-1,4-diazepin-2-ones have been made which are new compounds.
摘要:
A method of removing SO.sub.2 from a gas stream containing the same by absorbing the SO.sub.2 in an aqueous solution containing a 4-(2-hydroxyalkyl)-2-piperazinone compound or an alkyl or aryl substituted derivative thereof. These compounds provide an absorbent solution which is less subject to loss during the regeneration step and yet effectively remove the SO.sub.2 from the gas stream without interference from other associated gases.
摘要:
Bituminous compositions are improved by incorporating therein the reaction product of an organic amine with a substituted nitrogen-containing heterocyclic compound as an anti-stripping agent. These compositions are useful as a pavement material by blending with an aggregate.
摘要:
Asphalt compositions are improved by incorporating therein the reaction product of a hydrocarbyl substituted nitrogen-containing aromatic heterocyclic compound such as 2,4,6-trimethylpyridine, an aldehyde such as formaldehyde or ketone such as acetone and an amine such as a mixture of C.sub.10 -C.sub.18 aliphatic monoamides.
摘要:
Thermosettable compositions are disclosed which are prepared by reacting (A) a pyridine 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 pyridines; (B) at least one material having at least two aldehyde groups; and (C) at least one aldehyde containing at least one polymerizable unsaturated group; wherein components (A), (B) and (C) are employed in quantities which provide a mole ratio of (C):(B):(A) of from about 0.25:0.25:1 to about 4:4:1. These thermosettable compositions can be cured by heat and pressure or by homopolymerization in the presence of or by copolymerization with an N,N'-bis-imide. The compositions are useful as light weight fire resistant interior and exterior parts or panels for the aerospace and/or aircraft industry and the like.
摘要:
The reaction between a hydroxyl-containing material and an isocyanate-containing material is catalyzed by a pyrazino pyrazine compound such as 1,4,5,8-tetramethyldecahydropyrazino(2,3-b)pyrazine.