METHOD OF MULTILAYER CO-EXTRUSION Russian patent published in 2012 - IPC B32B27/30 C08L33/12 B29D7/00 

FIELD: process engineering.

SUBSTANCE: invention relates to protection of articles from thermoplastic polymer against scratches. Proposed method comprises application of protective layer by co-extrusion, or extrusion, or multi-moulding, and, at least, one thermoplastic polymer. Said protective layer comprises acrylic polymer including the following components in wt %: 80 - 99.8% of methyl methacrylate (MMA); 0 - 20%, of, at least, one copolymer capable of radical copolymerisation with MMA, and 0.2 - 10% of toxilic anhydride, or acrylic and/or methacrylic acid and, not obligatorily, anhydride groups of the following formula: wherein R₁ and R₂ stand for H- or methyl radical.

EFFECT: improved impact strength.

13 cl, 1 tbl, 6 ex