BP- I can contribute a little. Someone above (apologies, I didn't go back to see who) mentioned a patent that described one such process. Here is a link: http://www.google.com/patents/US3960790
As you will see, this was at attempt to deal with the challenges of 4 channel audio on vinyl. My recollection is that the old Mo-Fi "Super Vinyl" was similarly developed for discrete 4 channel vinyl records. The patent suggests that an excess of the agent can leave a deposit on the surface of the record. Other, older papers I've read about vinyl compounds talk about lubricants- which presumably aid flow of the molten compound, but don't seem to address "mold release" as such. One of the difficulties in getting to the bottom of this seems to be that the exact composition of vinyl compounds currently being used is probably proprietary- in discussions I had with someone knowledgeable in that field, he claimed that the whole concept of mold release was foreign to him, but I cannot quote or provide any external reference. The other source of information is likely the pressing plants themselves; I doubt they add anything to the compound, but who knows? I've been trying to get to the bottom of this myself. The makers of commercial fluids- some of whom I respect, seem to believe that mold release agents are a problem. But, I have yet to be convinced that any compound being supplied to pressing plants causes some adverse effect in the pressing of a record that requires cleaning. Whether other variables, like the temperature/duration of heat, cooling, operation of the press, stampers, etc. contribute to the problem, beyond the compound itself, one can only guess. I've certainly had badly manufactured records that suffered from no-fill, stitching or the like (all symptoms of a failure to properly impress the information onto the plastic), but those defects cannot be remedied by cleaning. Hardly the last word, but at least gives a little more insight?
As you will see, this was at attempt to deal with the challenges of 4 channel audio on vinyl. My recollection is that the old Mo-Fi "Super Vinyl" was similarly developed for discrete 4 channel vinyl records. The patent suggests that an excess of the agent can leave a deposit on the surface of the record. Other, older papers I've read about vinyl compounds talk about lubricants- which presumably aid flow of the molten compound, but don't seem to address "mold release" as such. One of the difficulties in getting to the bottom of this seems to be that the exact composition of vinyl compounds currently being used is probably proprietary- in discussions I had with someone knowledgeable in that field, he claimed that the whole concept of mold release was foreign to him, but I cannot quote or provide any external reference. The other source of information is likely the pressing plants themselves; I doubt they add anything to the compound, but who knows? I've been trying to get to the bottom of this myself. The makers of commercial fluids- some of whom I respect, seem to believe that mold release agents are a problem. But, I have yet to be convinced that any compound being supplied to pressing plants causes some adverse effect in the pressing of a record that requires cleaning. Whether other variables, like the temperature/duration of heat, cooling, operation of the press, stampers, etc. contribute to the problem, beyond the compound itself, one can only guess. I've certainly had badly manufactured records that suffered from no-fill, stitching or the like (all symptoms of a failure to properly impress the information onto the plastic), but those defects cannot be remedied by cleaning. Hardly the last word, but at least gives a little more insight?