- Email: [email protected]
Processing aids for re-processing starch-filled plastics
January 1993
Additivesfor Polymers
that permits the addition of up to 10 materials, many of which, until now, could only be dosed separately. granule, The product, a free-flowing combines UV stabilizers, heat stabilizers, and other additives with a phenolic antioxidant base. It is part of a new family of additive formulations called No Dust Blend. The Milan, Italy, company does not disclose details about the technology, because a patent is pending. However, it is said that the key to the process is the use of phenolic antioxidants, which act as a glue to bind additives within the granule. Blends can be individual process meet tailored to requirements. Contact: Enichem Synthesis SPA, Strade 2, Palazzo F7, Milanofiori I-20094, Assago, MI, Italy. Tel: -I-39-52-01. Fax: + 39-52-02-6684.
Processing aids for re-processing starch-filled plastics Processing aids for extrusion and reprocessing of starch-filled and conventional resins, have been introduced by Ecostar International. They are designed primarily, but not exclusively, to work with Ecostar Plus, a modified-starch additive system that allows conventional polymers to bio- and “E-flow extrusion aid” photodegrade. reportedly boosts output rates - by up to 50% with LLDPE, for example - and eliminates melt fracture in a variety of polythene blown films. It comes in masterbatch form with A second new loadings. customized masterbatch, E-flow desiccant, removes moisture when re-processing starched-tilled polythene. The company says these products eliminate two potential sources of processing difficulties with Ecostar Plus. Contact: Ecostar International, Tonawanda, NY, USA.
8
Mixing teeth improve compounding
glass
Using a relatively new toothed mixing element for compounding glass-reinforced polymers, reportedly can maximize both physical properties and process stability. Werner & Pfleiderer Corp has introduced what is termed the “ZME self-wiping distributive mixing element” which allows compounders to maximize the physical properties of a reinforced thermoplastic using dies with relatively high L/D ratios (ratio of land length to hole diameter). Contact: Werner & Pfleiderer Corp, 663 E. Crescent Ave, Ramsey, NJ 07446, USA. Tel. + l-201 -32 7-6300.
TECHNICAL
BRIEFS
Thermal degradation of short Kevlar fibre-thermoplastic polyurethane composites Results of a study by the Cochin University of Science and Technology, Kochi, India, show the thermal degradation of these composites takes place in two steps. Short Kevlar fibre improves the thermal stability of thermoplastic polyurethane, the optimum loading being 20 phr. The degradation of thermoplastic polyurethane and Kevlarthermoplastic polyurethane composite follows first-order kinetics. Polymer Degradation & Stability, 1992, 38, (31, 187-192
Antioxidants
and light stabilizers
Reactions of indoline nitroxide and phenoxy radicals. X-ray crystallographic analysis of l[0-(3,5-di-tert-butyl-4-hydroxy)-benzyll-1,2dihydro-2-methyl-2-phenyl-3-oxo-3H-indole and 3,5,3’5’-tetra-rcrr-butylstilbene-4,4’quinone. Polymer Degradation & Stability, 1993, 39, (I), 73-83 O1993 Elsevier Science Publishers L_td
Additivesfor Polymers
that permits the addition of up to 10 materials, many of which, until now, could only be dosed separately. granule, The product, a free-flowing combines UV stabilizers, heat stabilizers, and other additives with a phenolic antioxidant base. It is part of a new family of additive formulations called No Dust Blend. The Milan, Italy, company does not disclose details about the technology, because a patent is pending. However, it is said that the key to the process is the use of phenolic antioxidants, which act as a glue to bind additives within the granule. Blends can be individual process meet tailored to requirements. Contact: Enichem Synthesis SPA, Strade 2, Palazzo F7, Milanofiori I-20094, Assago, MI, Italy. Tel: -I-39-52-01. Fax: + 39-52-02-6684.
Processing aids for re-processing starch-filled plastics Processing aids for extrusion and reprocessing of starch-filled and conventional resins, have been introduced by Ecostar International. They are designed primarily, but not exclusively, to work with Ecostar Plus, a modified-starch additive system that allows conventional polymers to bio- and “E-flow extrusion aid” photodegrade. reportedly boosts output rates - by up to 50% with LLDPE, for example - and eliminates melt fracture in a variety of polythene blown films. It comes in masterbatch form with A second new loadings. customized masterbatch, E-flow desiccant, removes moisture when re-processing starched-tilled polythene. The company says these products eliminate two potential sources of processing difficulties with Ecostar Plus. Contact: Ecostar International, Tonawanda, NY, USA.
8
Mixing teeth improve compounding
glass
Using a relatively new toothed mixing element for compounding glass-reinforced polymers, reportedly can maximize both physical properties and process stability. Werner & Pfleiderer Corp has introduced what is termed the “ZME self-wiping distributive mixing element” which allows compounders to maximize the physical properties of a reinforced thermoplastic using dies with relatively high L/D ratios (ratio of land length to hole diameter). Contact: Werner & Pfleiderer Corp, 663 E. Crescent Ave, Ramsey, NJ 07446, USA. Tel. + l-201 -32 7-6300.
TECHNICAL
BRIEFS
Thermal degradation of short Kevlar fibre-thermoplastic polyurethane composites Results of a study by the Cochin University of Science and Technology, Kochi, India, show the thermal degradation of these composites takes place in two steps. Short Kevlar fibre improves the thermal stability of thermoplastic polyurethane, the optimum loading being 20 phr. The degradation of thermoplastic polyurethane and Kevlarthermoplastic polyurethane composite follows first-order kinetics. Polymer Degradation & Stability, 1992, 38, (31, 187-192
Antioxidants
and light stabilizers
Reactions of indoline nitroxide and phenoxy radicals. X-ray crystallographic analysis of l[0-(3,5-di-tert-butyl-4-hydroxy)-benzyll-1,2dihydro-2-methyl-2-phenyl-3-oxo-3H-indole and 3,5,3’5’-tetra-rcrr-butylstilbene-4,4’quinone. Polymer Degradation & Stability, 1993, 39, (I), 73-83 O1993 Elsevier Science Publishers L_td