Saying that it has high resistance to chemical degradation and that it is resistant to oxidation is almost the same thing as saying that it doesn't corrode - corrosion IS chemical or oxidative degradation. That isn't a reason WHY it doesn't corrode.
The clue is in the structure. The "very regular structure" that you mention is a long chain alkane with secondary chloride groups. There are not many reactions that alkanes will undergo, and the few there are generally involve free radicals. Halogens tend to inhibit free radical reactions, so added halogens along the alkane chain reduce the reactivity of the alkane even further. As for the secondary halogens, these can undergo elimination and substitution reactions, but chlorine isn't that great of a leaving group and the reactions occur with difficulty, using strong bases or very strong nucleophiles and highly solvating conditions.