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Making polymethyl methacrylate casting plates with enhanced shockproofness, comprises heating a mixture to activate alkoxyamine and polymerizing the monomers, reactivating to form branches, adding methyl methacrylate, casting and heating
Making polymethyl methacrylate casting plates with enhanced shockproofness, comprises heating a mixture to activate alkoxyamine and polymerizing the monomers, reactivating to form branches, adding methyl methacrylate, casting and heating
Method for preparing polymethyl methacrylate (PMMA) casting plates (I) with enhanced shockproofness comprises: heating a mixture (comprising alkoxyamine and monomers to form a central sequence (B1)) to activate alkoxyamine and polymerizing the monomers; reactivating (B1) to form the branches (A); adding methyl methacrylate (MMA) to the obtained mixture and optionally a comonomer (M) with MMA and a free radical initiator; casting and heating. Method for preparing polymethyl methacrylate (PMMA) casting plates (I) with enhanced shockproofness comprises: heating a mixture (comprising at least one alkoxyamine of formula Z(T) n and monomers to form a central sequence B1) to activate alkoxyamine and polymerizing the monomers; reactivating B1 optionally mixed with the non-consumed monomers of the previous in the presence of the monomers to form the branches (A); adding MAM to the obtained mixture and optionally at least one comonomer (M) capable of forming free radical copolymerization with the methyl methacrylate (MMA) and one free radical initiator; casting the obtained mixture in a mould, followed by heating. Z : a multivalent group; and n : greater than 2 (preferably 2-8). Independent claims are also included for: (1) the preparation of casting PMMA plates with enhanced shockproofness comprising: preparing a mixture comprising a copolymer sequence of formula B1(-A) n made up of n branches (A) and bonded by covalent bonds to one central sequence B1 (where n is =2 (preferably 2-8)), MAM and optionally at least a comonomer (M) and free radical initiator; casting the obtained mixture as a mould, followed by heating to obtain a cast plate; (2) a plate obtained by the process; (3) homo- or copolymer of (MAM) comprising homogeneously dispersed particles of B1(-A) n sequenced copolymer in the form of spherical nodules having one or more sub-nodules of same composition as homo- or copolymer of methyl methacrylate; and (4) a cast plate comprising a homo- or copolymer.
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