ASO Co., Ltd.

Most of our plastic bags for pharmaceuticals are additive-free types. Basically, additive-free raw materials can only be found in the radical polymerisation LDPE. This is because LLDPE always uses a catalyst in the reaction for ionic polymerisation.
Ordinary LLDPE uses a chlorine-based catalyst containing titanium tetrachloride. Chlorine is therefore corrosive, so calcium stearate is added to neutralise it. Calcium chloride, stearic acid, etc. are then produced. There are some non-chlorine catalyst types, but most are of this type.

Next, LDPE is a radical polymerisation (active polymerisation), so in principle no catalyst is used. Therefore, immediately after polymerisation, polyethylene is additive-free (except for radical initiators, contamination, etc.), but the aforementioned additives are added as required in subsequent processes.

Someone says it would not be better to use no additives, but considering productivity (cost) and handling, it may be unavoidable to add additives.