29-09-2022 дата публикации
Номер: US20220306837A1
The present invention relates to the use of boronic acids to increase the storage stability of epoxy resin compositions and epoxy resin compositions comprising an epoxy resin, a curing agent, a curing accelerator and a boronic acid. 2. Use according to claim 1 , wherein radical Rin formula (I) means:{'sup': '1', 'R=methyl, ethyl, n-propyl, 1-methylethyl, n-butyl, 1-methylpropyl, 2-methylpropyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, n-nonyl, n-decanyl, hydroxymethyl, 2-hydroxyethyl, 3 -hydroxypropyl, 4-hydroxybutyl or 5-hydroxypentyl.'}3. Use according to claim 1 , wherein Rin formula (I) is a radical of formula (II) claim 1 , wherein radicals R claim 1 , R claim 1 , Rmean:{'sup': '2', 'sub': 1', '5', '2, 'R=fluorine, chlorine, bromine, iodine, cyano, Cto Calkyl, alkoxy, acyl, alkylsulfonyl, aryl, carboxyl or B(OH),'}{'sup': 3', '4, 'R, R=hydrogen.'}4. Use according to claim 1 , wherein Rin formula (I) is a radical of formula (II) claim 1 , wherein radicals R claim 1 , R claim 1 , Rindependently of one another mean:{'sup': 2', '3, 'sub': 1', '5', '2, 'R, R=independently of one another fluorine, chlorine, bromine, iodine, cyano, Cto Calkyl, alkoxy, acyl, alkylsulfonyl, aryl, carboxyl or B(OH),'}{'sup': '4', 'R=hydrogen.'}5. Use according to claim 1 , wherein Rin formula (I) is a radical of formula (II) claim 1 , wherein radicals R claim 1 , R claim 1 , Rindependently of one another mean:{'sup': 2', '3', '4, 'sub': 1', '5', '2, 'R, R, R=fluorine, chlorine, bromine, iodine, cyano, Cto Calkyl, alkoxy, acyl, alkylsulfonyl, aryl, carboxyl or B(OH).'}9. Epoxy resin composition according to claim claim 1 , wherein the epoxy resin composition based on 100 parts by weight of epoxy resin comprises:a) 1 to 15 parts by weight of curing agent, 'c) 0.05 to 3.0 parts by weight of boronic acid according to formula (I).', 'b) 0.1 to 9 parts by weight of curing accelerator, and'}10. Epoxy resin composition according to claim 7 , wherein the weight ratio of curing agent to boronic acid ...
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