Patent Application
20210139673
The invention relates to novel trisubstituted triazines, and their uses as epoxy and cyclic carbonate curing agents.
An embodiment of the invention relates to compounds having the formula:
wherein:
Y is OH, NH2 or CH2NH2,
when Q is P, R is phenyl,
when Q is P═O, Z is R or OR, and R is alky or phenyl,
when Q is CH, Z is PO(R)2 or PO(OR)2, and
when Q is N, Z is R.
An additional embodiment of the invention is directed to methods for curing epoxy and/or cyclic carbonates employing the above compounds as curing agents.
Still further embodiments of the invention relate to
The present invention is predicated on the unexpected discovery that certain novel tri-substituted triazines function as curing agents for epoxy and/or cyclic carbonates while also providing significant flame-retardant properties thereto.
Exemplary compounds of the invention described by the above generic formula include, but are not limited to:
The compounds of the invention may be synthesized according to the reaction schemes set forth in
Referring to
Alternatively, the tri-substituted triazines of the invention may also be prepared as described in Samanta, Jayanta; Natarajan. Ramalingam; Organic Letters; vol. 18: nb. 14; (2016): p. 3394-3397; Kotha, Sambasivarao: Kashinath, Dhurke; Kumar, Sandeep: Tetrahedron Letters; vol. 49; nb. 37; (2008): p. 5419; Kotha, Sambasivarao; Kashinath, Dhurke; Lopus, Manu; Panda, Dulal; Indian Journal of Chemistry—Section B—Organic and Medicinal Chemistry; vol. 48: nb. 12; (2009): p. 1766-1770; Zhang, Rui-Feng; Hu, Wen-Jing; Liu, Yahu A.; Zhao, Xiao-Li; Li, Jiu-Sheng; Jiang, Biao; Wen, Ke: Journal of Organic Chemistry vol. 81; nb. 13; (2016); p. 5649-5654; Patent; Chinese Academy Of Sciences Shanghai Advanced Institute; Wen Ke: Wu Xinlang; Hu Wenjing; Zhang Ruifeng; Hu Weibo; Yang Yafen; Peng Lanzhen; Wang Guo: (24 pag.); CN108239099; (2018); (A) Chinese; Dash, Barada Prasanna; Satapathy, Rashmirekha; Maguire, John A.; Hosmane, Narayan S.; Organometallics; vol. 29; nb. 21; (2010): p. 5230-5235: Patent; JSR CORPORATION: NOSAKA, Naoya; WAKAMATSU, Gouji; ABE, Tsubasa; MATSUMURA, Yuushi: MIYAKE, Masayuki; TAKIMOTO, Yoshio; (21 pag.); US2019/94695: (2019); (A1) English; Maragani, Ramesh; Thomas, Michael B.; Misra, Rajneesh; D'Souza, Francis, Journal of Physical Chemistry A: vol. 122; nb. 21: (2018); p. 4829-4837; Zhou, Junfeng, Wang, Jiajia, Jin, Kaikai; Sun, Jing; Fang, Qiang; Polymer; vol. 102: (2016); p. 301-307; or Jena, Bibhuti Bhusan; Satish, Lakkoji; Mahanta, Chandra Sekhara: Swain, Biswa Ranjan; Sahoo, Harekrush-na; Dash, Barada P.; Satapathy, Rashmirekha: Inorganica Chimica Acta; (2019); p. 62-58.
Although tri-substituted triazines have previously been employed as curing agents (hardeners) for epoxies, the compounds of the present invention also provide significant and unexpected flame retardant properties to the resulting cured products.
“Epoxies” include, but is not limited to, monomers, oligomers, resins, or polymers with two or more epoxy groups per molecule, with no particular restrictions on the molecular weight or molecular structure, and examples include bisphenol-type epoxy resins such as bisphenol A-type epoxy resins, bisphenol F-type epoxy resins and teramethylbisphenol F-type epoxy resins, biphenyl-type epoxy resins such as biphenyl-type epoxy resins and tetramethylbiphenyl-type epoxy resins, crystalline epoxy resins such as stilbene-type epoxy resins and hydroquinone-type epoxy resins; novolac-type epoxy resins such as cresol-novolac-type epoxy resins, phenol-novolac-type epoxy resins and naphthol-novolac-type epoxy resins; phenolaralkyl-type epoxy resins such as phenylene backbone-containing phenolaralkyl-type epoxy resins, biphenylene backbone-containing phenolaralkyl-type epoxy resins, phenylene backbone-containing naphtholaralkyl-type epoxy resins and alkoxynaphthalene backbone-containing phenolaralkyl epoxy resins, trifunctional epoxy resins such as triphenolmethane-type epoxy resins and alkyl-modified triphenolmethane-type epoxy resins; modified phenol-type epoxy resins such as dicyclopentadiene-modified phenol-type epoxy resins and terpene-modified phenol-type epoxy resins; heterocyclic ring-containing epoxy resins such as triazine nucleus-containing epoxy resins; and phosphorus atom-containing epoxy resins, and any one or a combination of two or more thereof.
“Cyclic carbonates” or “cyclocarbonates” include, but are not limited to, those disclosed in U.S. Pat. Nos. 10,000,461; 9,667,313; 9,556,304; 8,153,042; 6,339,129; and 5,640,606, and any one or a combination of two or more thereof.
The amount of curing agent required will depend upon the epoxy or cyclocarbonate employed, but is generally in the range of from about 0.1 to about 10 parts by mass, preferably from about 01 to about 5 parts by mass based on 100 parts by mass of epoxy or cyclocarbonate.
The compounds of the invention may be added directly with the epoxy or cyclocarbonate W be cured, or they may be first be admixed with a suitable compatible carrier or solvent, such as, for example, those employed with conventional curing agents therefore.
Epoxies and cyclocarbonates may be cured, employing the curing agents of the invention, according to methods well known in the art, such as, for example, the methods disclosed in U.S. Pat. Nos. 6,809,161 and 6,541,119.
It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this invention is not limited to the particular embodiments disclosed, but it is intended to cover modifications which are within the spirit and scope of the invention, as defined by the appended claims.
