Method For Producing Functionalized Thermoplastic Elastomers

摘要

A method for producing functionalized thermoplastic elastomers on the basis of grafting substrates, selected from olefine-block copolymers of composition 80 to 98 mass-% ethylene-/2 to 20 mass-% C3- to C-12-olefine units or partially crystalline propylene/ethylene and/or C4- to C-12-olefine and/or C4- to C12-diene-copolymers of composition 50 to 98 mass-% propylene-/2 to 50 mass-% C2,- and/or C4- to C12-olefine and/or C4- to C12-diene units or cross-linked styrene/define/styrene or styrene/olefine-block copolymers, wherein, in a liquid mixing reactor per 100 mass parts of particular grafting substrate—0.1 to 15 mass parts of at least one functional monomer from the series of functional groups comprising α,β-ethylenic unsaturated compounds or 0.1 to 15 mass parts of a monomer mixture comprising at least one of said functional monomers and—0.01 to 10 mass parts of at least one initiator forming free radicals having a 1-hour half-life temperature (THwz/1h) between 50 and 200° C. are added and, at reaction temperatures between 40° C. and the melting or softening temperature of the grafting substrate, are polymerized over a reaction period between 10 and 200 min to solid-fluid phase, wherein a grafting product having a grafted functional monomer is produced by such a solid phase functionalization which is used as an input component for further processing. Functionalized thermoplastic elastomers having a degree of functionalization between 0.1 and 5 mass-% can be obtained using the method. Said elastomers are suitable for use as a bonding agent and/or adhesive agent for various substrates or multi-layer composites.

主权项

1. A process for preparing functionalized thermoplastic elastomers based on graft substrates selected from
olefin block copolymers with the composition 80 to 98 mass-% of ethylene-/2 to 20 mass-% of C3- to C12-olefin units, or semi-crystalline propylene/ethylene and/or C4- to C12-olefin and/or C4- to C12-diene copolymers of the composition 50 to 98 mass-% of propylene-/ 2 to 50 mass-% of C2- and/or C4- to C12 olefin and/or C4- to C12 and/or C4- to C12-diene units, or cross-linked styrene/olefin/styrene- or styrene/olefin block copolymers, wherein in a fluid mixing reactor, i.e. in a temperature-controllable mixer for fine-grained materials, which ensures a free flowing powder bed, 0.1 to 15 mass parts of at least one functional monomer from the series of functional groups containing α, β-ethylenically unsaturated compounds or from 0.1 to 15 mass parts of a monomer mixture containing at least one of these functional monomers, and 0.1 to 10 mass parts of at least one initiator forming free radicals with a 1-hour half-life temperature (THWZ/1h) between 50 and 200° C.are added to 100 mass parts of particulate graft substrate and polymerized at reaction temperatures between 40° C. and the melting or softening temperature of the graft substrate for a reaction time between 10 and 200 min in the solid-fluid phase, whereby by such a solid state functionalization a graft product possessing a grafted functional monomer is produced which is used as starting component for further processing, wherein during further processing of the graft product
100 mass parts of a solid phase graft product, to which between 0.1 and 60 mass parts of at least one functional monomer or of a monomer mixture containing at least one functional monomer and between 0.01 and 20 mass parts of at least one initiator forming free radicals with a 1-hour half-life temperature (THWZ/1h) 80-240° C. were admixed, together with 100 to 4000 mass parts of an unmodified olefin elastomer, are continuously fed into the feed area of an extruder via metering devices, the reactive extrusion is carried out at temperatures above the melting or softening point of the olefin elastomer, and a functionalized elastomer is continuously discharged at the reactor end.