Crosslinkable compositions, thermoplastic elastomers derived from same and use thereof

摘要

Crosslinkable composition comprises: (a) 5-90 (preferably 10-30) wt.% of at least a copolyester as thermoplastic elastomer; (b) 10-95 (preferably 55-85) wt.% of at least an alpha -olefin-vinyl acetate-copolymer with a vinyl acetate content of >= 40 (preferably >= 50) wt.%; (c) 0-30 (preferably 5-15) wt.% of fillers, softeners and/or additives; and (d) 0.1-15 parts by weight per 100 parts by weight of the alpha -olefin-vinyl acetate-copolymer (parts per hundred rubber (phr)), preferably 0.5-7 phr of at least a peroxide as radically crosslinking initiator. Independent claims are included for: (1) preparing the composition, comprising mixing the components (a)-(d), (e) at least a co-crosslinker, which is triallyl isocyanurate (preferred), N,N'-m-phenylene dimaleimide, triallyl cyanurate, liquid polybutadiene, trimethylolpropane-N,N'-m-phenylene maleimide, N-methyl-N,N'-m-phenylene dimaleimide, divinylbenzene, polyfunctional methacrylate monomers such as ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, trimethylolpropane trimethacrylate and allyl methacrylate, or polyfunctional vinyl monomers such as vinyl butyrate and vinyl stearate, (f) at least one compatibility mediator, which is: a copolymer on basis of alpha -olefin-vinyl acetate-copolymer as polymer backbone, which is functionalized with carboxyl groups (preferred), carbonyl groups, halogen atoms, amino groups, hydroxyl groups or oxazoline groups; and obtained by grafting alpha , beta -ethylenically unsaturated mono- and/or dicarboxylic acids or their derivatives on the alpha -olefin-vinyl acetate-copolymer backbone; (2) producing a thermoplastic elastomer, comprising crosslinking the composition at temperature below the high melting- or softening temperature of the component (a); and (3) the thermoplastic elastomer, obtained by the above process.