: I think the proprietary brand name you are thinking of is Kevlar vs Dupont Armarid

"Kevlar" is merely DuPont's trade name for para-aramid fiber. "Twaron" is a similar product from another manufacturer.

: Also I believe "Spectra" is in the same family

No, it's completely different. Spectra is a polyethylene fiber, which is why it's so slippery and hard to knot or bond to.

: and there are ripstop cloths made with spectra under the brand Dynema

Not exactly. "Dyneema" is the trade name of the original polyethylene fiber developed by Hoescht-Celanese in Europe. Honeywell (formerly Allied Signal) licensed the manufacturing rights in the US and named their product "Spectra". They're the same product from different sources and should be considered interchangeable.