What to do when a PhD supervisor is not collaborating on publications after the PhD from it? If someone's (SO) PhD supervisor is not collaborating on publications from SO's PhD. The problem arose as SO raised his mistrust (for the supervisor) on other academic issues. The supervisor treats student's work as his, and SO does not agree with that.

SO has one paper just rejected from a journal but could be submitted in another journal. This is from SO's PhD, so he would like to publish it and more from the PhD. SO is not sure how to go ahead with this, (with the supervisor or without). The paper is intellectually SO's but the supervisor helped in improving the writing (of the rejected paper). As the supervisor is refusing to collaborate, how can SO publish that? Can SO do that without supervisor name? What could be the consequences?
If the advisor made a substantial intellectual contribution (or, in fields where it's relevant, procured the grant supporting the work), there's not much the author can do to publish the paper without the advisor's permission. The advisor would have claim to authorship rights if:


the paper grew out of work proposed by the advisor, or was supported by funds accrued by the advisor;
the student discussed the work with the advisor and gained useful feedback or guidance about the direction or results of the project;
the advisor contributed to the writing of the paper.


The last point is definitely true; it's not clear if the first two points hold, but they very well could, given the situation described.

Basically, if the advisor has authorship rights, the student is more or less screwed if they try to publish. If they publish the paper, with an author who has not given permission for submission or without an author who has authorship rights, then that is sufficient grounds for retraction of a paper.