Jun.  16,2016  7  US 2016/0168306 Al  described herein, exhibit a reduced increase of viscosity when  held at process temperatures at 165°  C. instead of 175°  C.  [0069]  In contrast, it is believed that prior art TPA conden› sates undergo molecular rearrangements that result in a vis› cosity increase and a reduced solubility in common solvents  when held (greater than 1 hour) at an elevated temperature,  such as 175°  C. or greater, over time as a result of resin  degradation in the phenol removal step of the process.  [0070]  Also, it has been observed that the triazine-arylhy› droxy-aldehyde condensates obtained by the high pKa pro› cesses described herein (pKa of greater than 6) unexpectedly  and surprisingly exhibited increased reactivity, including  self-curing reactivity and exothermic heat generation, than  condensates made with added catalysts that have a pKa value  ofless than 5.  [0071]  For example, a DSC (differential scanning calorim› eter) analysis of a condensate formed from a HMMM-phenol  reaction mixture described herein, such as in Example 9A,  was observed to have an exothermic reaction at around 183°  C. This exothermic reaction indicates a self-curing reaction  that was not observed in prior art processes or the low pKa  process of the current invention.  [0072]  Further examples of self-curing reactions were  observed in Examples 9A and 3. The condensate from the  HMMM-phenol reaction mixture, when heated at 17 5°  C. for  only about 4 hours in Example 9A, was observed to have a  self-curing type reaction which is evidenced by hardening of  the resin. The condensate made from melamine, phenol and  formaldehyde reaction mixture in Example 3, was observed  to undergo a viscosity increase of greater than 100% when  heated at 175°  C. for 7 hours.  [0073]  As the triazine-arylhydroxy-aldehyde condensates  form such processes described herein have been observed to  exhibit self-curing like behavior when heated at temperatures  of above 165°  C., under such conditions the condensate may  be designated as a self-curing reaction and/or a self-curing  condensate.  [0074]  In view of such reactivity, the triazine-arylhydroxy› aldehyde condensates made from the high pKa processes  described herein may be prepared as a solution of the triazine› ary lhydroxy-aldehyde condensates in one or more organic  solvents having one or more functionalities selected from the  group of an ether functionality, a ketone functionality, an  alcohol functionality, an ester functionality, and combina› tions thereof, or formed as a solid with a viscosity stabilizer,  to preserve a desired viscosity and reduce the reactivity of the  condensate.  [0075]  It has also been observed that the condensates  formed by the processes described herein exhibited improved  color stability over time. The condensates exhibited a Gard› ner color scale number of less than 3, and maintained a  Gardner color scale number ofless than 3, such as less than 1,  for at least 150 days. Additionally, the surprisingly and unex› pectedly improved color stability was also observed by the  condensates having a color change on the Gardner color scale  number ofless than 0.5, such as less than 0.2, for at least 150  days. Alternatively, the improved color stability was also  observed by the condensates having a color change on the  Hazen Color scale value ( also referred as APHA) ofless than  20, such as less than 8, for at least 150 days.  [0076]  The Gardner color scale numbers and Hazen Color  scale values were observed for pilot plant batch results of  Entry Numbers 1 and 2 (as shown in Tables II and III herein)  formed using the process in Example 2. For Entry Number 1,  the initial Gardner color scale number was observed to be 0.7  and the initial Hazen Color scale value was observed to be  153, and when measured 154 days later, the Gardner color  scale number was observed to be 0.8 and the Hazen Color  scale value was observed to be 156. For Entry Number 2, the  initial Gardner color scale number was observed to be 0.53  and the initial Hazen Color scale value was observed to be  125, and when measured 154 days later, the Gardner color  scale number was observed to be 0.6 and the Hazen Color  scale value was observed to be 132.  [0077]  The color scale values of the condensates measured  above were analyzed by dissolving the respective conden› sates in reagent grade acetone to prepare a 30% solids solu› tion (1 g resin, 2.33 g acetone or 0.75 gin 1.75 g acetone),  which was then mixed and dissolved completely at ambient  temperature and filtered using 0.45 micron syringe filter  before being measured for respective colors using a LICOfi  100 LCM Plus colorimeter from Dr. Lange GmbH & Co. KG,  of Germany. The LICOfi 100 LCM Plus colorimeter can  measure up to five different color values including Gardner  Color values and Hazen Color values (also referred as  APHA). The colorimeter measures the Gardner color value  scale having a range from 0 to 18 with an accuracy of about  +/-0.1. The colorimeter measures the Hazen (APHA) color  value scale having a range from Oto 1000 with an accuracy of  about +/-2. At least three readings were recorded for each  color scale and the results were averaged. While the average  variation in APHA color value between measurements was  about 27, the variation in Gardner was about 0.1.  [0078]  Additionally, it has been observed that the resins  obtained by a high pKa process described herein (pKa of  greater than 6) were unexpectedly and surprisingly observed  to have higher  Td  (temperature at which 5% weight loss  occurs) and yield significantly higher glass transition tem› peratures upon curing with epoxies than the triazine-phenol› aldehyde condensates made by prior art processes. The T  d  of  these resins were found to be greater than 300°  C., which is at  least 15°  C. higher than the resins made by the low pKa  process. Also, these resins, when cured with an epoxy cresol  novolac, yielded unexpectedly high T  g  of 189°  C. to 197°  C.  [0079]  The triazine-arylhydroxy-aldehyde condensate as  described herein may be further reacted with additional form› aldehyde, for example, 5 to 15%, based on the weight of the  initial amount of formaldehyde in order to raise the glass  transition temperature of cured compositions of the triazine  monomers, phenol monomers, and aldehyde monomers con› densate and an epoxy resin.  [0080]  Embodiments of the condensates of the triazine  monomers, arylhydroxy monomers, and aldehyde mono› mers, may be prepared by the process embodiments as fol› lows. While the following processes are described as using a  phenol monomer as the arylhydroxy monomer, the invention  contemplates that arylhydroxy monomers other than phenol  may be used in the processes described below, and the fol› lowing description should not be construed or interpreted as  limiting the scope of the invention.  [0081]  In all of the methods, the molar ratio of the reactants  may be from about 3 moles to about 30 moles, such as from  about 9 to about 14 moles of a phenol monomer for each mole  of a triazine monomer charged to a vessel and from about 1 to  Methods  for  Forming  Triazine-Arylhydroxy-Aldehyde  Condensates 