Embodiments of this disclosure provide a resin composition. The resin composition includes epoxy resin, a curing agent, and an inorganic filler. A cut-off particle size of the inorganic filler is 3 m, D10 of the inorganic filler ranges from 0.1 m to 0.4 m, D50 of the inorganic filler ranges from 0.5 m to 1.1 m, and D90 of the inorganic filler ranges from 1.3 m to 2.9 m. The resin composition has a low viscosity and high fluidity, and has a good narrow gap filling capability. Embodiments of this disclosure further provide disclosure of the resin composition.

Copolymers comprising recurring units of a phenyl glycidyl ether and alkylene oxides are disclosed. Some of the copolymers comprise a di- or polyfunctional nucleophilic initiator and recurring units of the phenyl glycidyl ether and an alkylene oxide. The di- or polyfunctional nucleophilic initiator is an alcohol, phenol, amine, thiol, thiophenol, sulfinic acid, or deprotonated species thereof. Other copolymers comprise a monofunctional nucleophilic initiator selected from thiols, thiophenols, aralkylated phenols, sulfinic acids, secondary amines, C.sub.10-C.sub.20 terpene alcohols, and deprotonated species thereof. Pigments dispersions comprising the copolymers are also disclosed. The copolymers meet the growing needs of the industry with their ease of manufacture, diverse structures, and desirable performance attributes for dispersing a wide range of organic and inorganic pigments. Agricultural applications for the copolymers are also disclosed.