Coating of epoxy resin cured with polymer- - captan ester on olefin polymer

摘要

A 1-olefin polymer substrate is coated with an epoxy resin cured with a curing agent contg. at least one ester group and at least three thiol groups per molecule of formula R - O - CO - R1 - SH p (where R is C3-6 hydrocarbyl of valency p; R1 is divalent C1-8 hydrocarbyl and p is 3-6), to impart an impact resistant, hydrocarbon impermeable coating to the polyolefin. A fluid aliphatic polyamide can be added to the epoxy formulation prior to completion of curing to give a more uniform surface to the coating. The curing agent is used in amount to give thiol : epoxy ratio of 0.5:1 to 2:1. The material is suitable for gasoline tanks.