Uh, is this a poke at teachers?
I haven't had an employer which offered full benefits to part time workers (not including shift workers making under 80 hours / two weeks, such as three 12-hour shifts / week; they do tend to get full benefits.)
St. Louis Bread Company, 25 hours a week. 401k, health and dental. If I remember profit sharing as well. I also worked for Dierbers(grocery store) health. My current job gives our part time with no minimum hours paid leave, 11% pension 100% vested in two years, 5% matching on 401k. They are out there, you just have to look.