1、123/02/2005New Hydrogenated Styrenic BlockCopolymers for Pressure SensitiveAdhesivesDr Nol De Keyzerand Dr Geert VermunichtKRATON Polymers Research S.A.Belgium223/02/2005Leading by ListeningPS and Rubber are incompatibleand form a two-phase structureRubber PS KRATON : Thermoplastic ElastomerEnd-use
2、regionProcessing regionRubberTgPSTgCrosslinkedreinforced rubberGlass Viscous liquidOrder-disorderTHomopolymerTwo-phase structureTemperature induced transitions300A323/02/2005Structure of Hydrogenated Styrenic BlockCopolymersSBSPB -(CH2 CH =CH-CH2-)n(CH2-CH - )mCH=CH2SEBSPEB-(CH2CH2-)n(CH2 CH -)mCH2C
3、H3PS PSRUBBER423/02/2005Features of conventional Kraton GHydrogenation of double bonds- higher mid-block Tg (-55C) than SBS (-90C)- long term thermal stability and weatherability + UV additives- lower mid-block solubility parameter ( = 7.9) than SBS ( = 8.3) hydrogenated tackifyers, polyolefins, wax
4、es- enhanced phase separationhigh cohesion formulation dilutionHildebrand solubility parameter in (cal/cm3)1/2523/02/2005Features of new Kraton GModifying the EB structure- higher mid-block Tg (-38C) than SEBS (-55C)- higher Me -G modulus, tack, Hot-melt viscosity- lower mid-block solubility paramet
5、er ( = 7.8), increased compatibility with PP (clarity) and APAO623/02/2005Kraton G Polymer Grades Polymer Type Polystyrene Mid-block solution Melt Flow morphology% DMA Tg C visc, cPs g/10 minMD-6917 SEBS 33 -38 70 at 10% 0 powderG-1651 SEBS 33 -55 1 800 at 10% 0 powderMD-6924 SEBS 20 -38 1 300 at 25
6、% 30 10LT N/25 mm 6 13 9PA 180 N/25 mm 12 18 13HP ss 2 kg hours 60 AF 200 200SAFT 0.5 kg C 87 112 106HMV 177 C Pa.s 34 30 801623/02/2005PSA Properties Comparison between KRATON D and KRATON G formulationsIngredients - %w % P ol ystyre ne F-1 F-2Kraton D-1160 19 45Kraton MD-6924 21 32C5 49H-C9/PH-C9
7、51Oil 5 16Anti-oxidant 1 1Properties unitsRBT cm 30 30LT N/25 mm 16 13PA 180 N/25 mm 19 18HP ss 2 kg hours 140 200SAFT 0.5 kg C 110 112HMV 177 C 73 30HMV 180 C Pa.s - -HMV 190 C 40 -1723/02/2005Hot-Melt Viscosity stability between KRATON D and KRATON G formulationsHot-melt viscosity - 177C - 24 hour
8、sTime in hoursviscosity Pa.s048 12 16 20 2420304050607080Kraton D-1160/C5/Oil/A.O. - 45% polymerKraton GMD-6924/H-HCR/PH-HCR/Oil/A.O. - 32% polymer16/01/20011823/02/2005Novel Hydrogenated SEBS block copolymersprovides to the formulatorlow hot-melt viscosity and processing temperatures for the end-usera good balance of tack , adhesion and cohesionexcellent long term thermal stability UV stability in combination with UV absorbersWide application latitudeConclusions
