TRANSPARENT AND ANTISTATIC PMMA COMPOSITION
A transparent antistatic composition based on polymethyl methacrylate (PMMA), including: 55% to 99.9% by weight of PMMA, and 0.1% to 45% by weight of at least one polyamide (PA) block-containing and polyether (PE) block-containing copolymer (PEBA) including polyethylene glycol (PEG), with respect to the total composition weight, said copolymer including in the range 50% to 80% by weight of PEG with respect to the total weight of copolymer. Also, the use of a composition of this type for the manufacture of at least a portion of the following items: an industrial part, an automobile part, a safety accessory, sign, luminous strip, signalling and advertizing panel, display, etching, furniture, shop fitting, decoration, contact ball, dental prosthesis, ophthalmological implant, membrane for hemodialysis, optic fibers, artwork, sculpture, camera lenses, disposable camera lenses, printing support, in particular a support for direct printing with UV inks for pictures, photographs, window glass, panoramic roof.
1 . A transparent antistatic composition based on polymethyl methacrylate (PMMA), comprising:
55% to 99.9% by weight of PMMA, and
0.1% to 45% by weight of at least one polyamide (PA) block-containing and polyether (PE) block-containing copolymer (PEBA) comprising polyethylene glycol (PEG),
with respect to the total composition weight,
wherein said copolymer comprises in the range between 50% to 80% by weight of PEG with respect to the total weight of copolymer.
2 . The composition as claimed in claim 1 , comprising:
65% to 97% by weight of PMMA, and
3% to 35% by weight of copolymer comprising PEG,
with respect to the total composition weight.
3 . The composition as claimed in claim 1 , in which said copolymer comprises 55% to 75% by weight of PEG with respect to the total weight of copolymer.
4 . The composition as claimed in claim 1 , in which said at least one polyamide block comprises at least one of the following polyamide monomers: 6, 11, 12, 5.4, 5.9, 5.10, 5.12, 5.13, 5.14, 5.16, 5.18, 5.36, 6.4, 6.9, 6.10, 6.12, 6.13, 6.14, 6.16, 6.18, 6.36, 10.4, 10.9, 10.10, 10.12, 10.13, 10.14, 10.16, 10.18, 10.36, 10.T, 12.4, 12.9, 12.10, 12.12, 12.13, 12.14, 12.16, 12.18, 12.36, 12.T and mixtures thereof or copolymers.
5 . The composition as claimed in claim 1 , in which the PA blocks comprise at least 30% by weight of PA 11 with respect to the total weight of PA blocks.
6 . The composition as claimed in claim 1 , in which said copolymer further comprises at least one polyether other than PEG selected from PTMG, PPG, PO3G, and mixtures thereof.
7 . The composition as claimed in claim 1 , in which said copolymer comprises at least one PEBA selected from: PA6-PEG, PA11-PEG, PA12-PEG, PA10.10-PEG, PA10.12-PEG and mixtures thereof.
8 . The composition as claimed in claim 1 , in which said copolymer comprising PA blocks and PE blocks is a segmented block copolymer comprising three different types of blocks, said copolymer being selected from copolyetheresteramides and copolyetheramideurethanes.
9 . The composition as claimed in claim 1 , in which said copolymer has an inherent viscosity of 2 or less.
10 . The composition as claimed in claim 1 , in which said PMMA, said PA blocks and/or said PE blocks are obtained at least in part from renewable starting materials.
11 . The composition as claimed in claim 10 , comprising a quantity of biocarbon of at least 1%, which corresponds to a 14 C/ 12 C isotopic ratio of at least 1.2×10 −14 .
12 . The composition as claimed in claim 11 , comprising a quantity of biocarbon of more than 5%.
13 . The composition as claimed in claim 1 , comprising no organic salt.
14 . The composition as claimed in claim 1 , further comprising 0.1% to 10% by weight of at least one organic salt in the molten state with respect to the total composition weight.
15 . The composition as claimed in claim 6 , in which said at least one organic salt comprises at least one cation comprising at least one of the following molecules: ammonium, sulfonium, pyridinium, pyrrolidinium, imidazolium, imidazolinium, phosphonium, lithium, guanidinium, piperidinium, thiazolium, triazolium, oxazolium, pyrazolium, and mixtures thereof.
16 . The composition as claimed in any one of claim 6 , in which said at least one organic salt comprises at least one anion comprising at least one of the following molecules: imides; borates; phosphates; phosphinates and phosphonates; amides; aluminates, halides; cyanates; acetates; sulfonates, trifluoromethanesulfonate; sulfates.
17 . The composition as claimed in claim 1 , further comprising at least one agent improving the surface conductivity selected from: hygroscopic agents; fatty acids; lubricants; metals; metallic films; metallic powders; metallic nanopowders; aluminosilicates; amines; esters; fibers; carbon black; carbon fibers; carbon nanotubes; polyethylene glycol; intrinsically conductive polymers; masterbatches; and mixtures thereof.
18 . The composition as claimed in claim 1 , further comprising at least one additive and/or adjuvant selected from organic or inorganic fillers, reinforcing agents, plasticizers, stabilizers, antioxidants, UV screens, flame retardants, carbon black, carbon nanotubes; mineral or organic colorants, pigments, colorants, unmoulding agents, lubricants, foaming agents, shock resistant agents, shrink resistant agents, flame retardants, nucleating agents, and mixtures thereof.
19 . A method of using a composition as claimed in claim 1 , for the manufacture of at least a portion of the following items: an industrial part, an automobile part, a safety accessory, sign, luminous strip, signalling and advertizing panel, display, etching, furniture, shop fitting, decoration, contact ball, dental prosthesis, ophthalmological implant, membrane for hemodialysis, optic fibers, artwork, sculpture, camera lenses, disposable camera lenses, printing support, in particular a support for direct printing with UV inks for pictures, photographs, window glass, panoramic roof.