Patent ID: 8399557

Claim:
Transparent blend or alloy comprising, by weight, the total being 100%: (A) 1 to 99% of at least one constituent copolymer: exhibiting a high transparency such that the transmission at 560 nm through a sheet with a thickness of 2 mm is greater than 65%; exhibiting a glass transition temperature of at least 90° C.; and being amorphous or exhibiting a crystallinity ranging up to semicrystallinity; and comprising: (A1) amide units, including amide units produced from at least one cycloaliphatic diamine unit; and (A2) flexible ether units; (B) 99 to 1% of at least one constituent polymer chosen from: (Ba) semicrystalline copolyamides comprising amide units (Ba1) and comprising ether units (Ba2), wherein said semicrystalline copolyamides have a glass transition temperature (Tg) of less than 65° C.; and alloys based on such copolyamides (Ba); and (C) 0 to 50% by weight of at least one polyamide, copolyamide, or copolyamide comprising ether units other than those used in (A) and (B) above; and/or of at least one additive normal for thermoplastic polymers and copolymers; the choice of the units or monomers in the composition of (A), (B) and (C) and also the choice of the proportions of the said units or of the said monomers being such that the resulting blend or alloy exhibits a high transparency such that the transmission at 560 nm through a sheet with a thickness of 2 mm is greater than 50%.