yes, IPSP are associated with hyperpolarization because it inhibits Action Potentials from occurring and by doing so the neuron becomes hyperpolarized again

An inhibitory postsynaptic potential (IPSP) is a kind of synaptic potential that makes a postsynaptic neuron less likely to generate an action potential.

slow closing of voltage-gated K+ channels

Potential hyperpolarization are more negative to the resting membrane potential because of voltage. This is taught in biology.

despolarization