Patent ID: 9617385
Date: 2017-04-11
CPC Classifications: C08G,C08J,D06M,H01B,H01L,H05K

Claim:
1. A method of producing a composite article, comprising: forming a mixture comprising a solvent, amines, and paraformaldehyde, and; heating the mixture to a first temperature to produce a first partially cured mixture of a first viscosity; coating a work piece with the first partially cured mixture of the first viscosity to produce polymer impregnated fibers (prepreg); heating the prepreg to a second temperature to produce a B-stage prepreg of a second viscosity; cooling the B-stage prepreg; forming an article from the B-stage prepreg; and heating the article at a temperature from about 150° C. to about 280° C. to form a fully cured composite containing polyhexahydrotriazine, wherein the amines of the mixture comprise at least 50% by mole cyclic aliphatic amine based on polymer.