You may be able to get an opinion from some of the local driveway coating companies, but they are probably not going to be suitable for a lawsuit. A chemical analysis company ($$$) will probably be able to figure out what your driveway is coated with.
If you are being sued, do you have an attorney? If so, he should be doing this.
While hindsight is 20/20, I have seen several posts about slippery driveways, after being painted, this is probably especially true if HOUSE paint or similar was used.
I coated by garage floor with a product from Sherwin Williams and added a product called shark skin that gives a non-slip finish.
I hope this helps, and good luck with your suit.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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