Haglslagbestandig flerlagstværstiverplade af polymethylmethacrylat

摘要

Multiple webbed sheets, consisting of high-impact polymethyl methacrylate (PMMA) (SP) contg. (1) 4-30 wt% elastomer phase (E) consisting of a crosslinked polymer (VP) of 60-99.9 pts. wt. alkyl and/or aryl acrylate, 0.1-10 pts. wt. crosslinking monomers with at least two radically polymerisable double bonds and opt. 0-30 pts. wt. mono-unsatd. comonomers; and (2) 70-96 wt% thermoplastic matrix phase (M) consisting of PMMA (P) contg. up to 20 pts. wt. suitable comonomer units (w.r.t. 100 pts. wt. P), with a difference ( DELTA n) of not more than 0.02 between the refractive indices of (E) and (M). The thickness (d) of the outer web (1a) on the exposed side of the sheet is given by d (mm) = 100 (mm x kJ/m<2>) / acu (kJ/m<2>) + 30 (kJ/m<2>) (I), d = thickness of 1a; acu = Charpy impact strength as in ISO 179/1fU.