Inventor seeks license for barrier technology
Inventor Emery Valyi has applied for a patent for a technology that can use recycled PET to produce food-grade containers and is licensing the technology.
Although Valyi's news release stated that DuPont Films was working with Valyi on the process, DuPont issued a statement to the contrary.
``DuPont is familiar with Dr. Valyi and his industry contributions, but cannot comment on the nature of his work or the process available for license through Dr. Valyi ... DuPont's role in this technology, if commercially developed, is to be a quality supplier of PET resins.''
In fact, DuPont, which had held an exclusive license to this barrier technology, is converting it to a nonexclusive license, allowing Valyi to announce that it is available for licensing.
The two-stage compression stretch blow molded bottle, jar or can incorporate a barrier film to separate the contents from any resin impurities in the container.
Valyi was not available for comment.
The barrier material can be polypropylene, ethylene vinyl alcohol or nylon and can be multilayer to provide an oxygen barrier. The patent enables the use of textile-, low- or recycled-grade PET to be used without concern about contamination.
Valyi is working in conjunction with MGA Inc. in Gloucester, Mass.
Tel. (978) 281-3310, fax (978) 281-3315.
DuPont Co. introduces antimicrobial additive
DuPont Co. debuted its MicroFree, a powdered antimicrobial additive for plastics and other products.
Targeted applications include molded shower stalls, sinks, vinyl siding and packaging materials.
MicroFree is based on silver, zinc and copper for long-term prevention of bacterial, fungal and mold growth. A spokesman stressed the material is not a biocide that acts on contact.
The Wilmington, Del., firm said MicroFree is light colored, unaffected by solvents, odorless and can withstand high temperatures of processing. Typical usage levels range from 0.3 percent for hydrophilic plastics to about 1-2 percent for hydrophobic plastics like polyethylene.
Tel. (800) 255-4596, fax (302) 992-2571.
Millennium debuts several PP additives
Millennium Petrochemicals Inc. introduced five polypropylene grades for injection molding and another PP as a hardness additive for composites.
The Cincinnati firm claimed its new Petrofil mineral-filled PP resins outperform other filled PPs in impact strength, surface characteristics and processability. It said the improvements are the result of its new compounding technology.
New Petrofil grades range from a very high melt flow compound with notched Izod impact strength of 9.5 foot-pounds per square inch to a medium melt flow type with heat deflection temperature of 208° F at 66 psi. Millennium said they contain processing aids to reduce shear viscosity and ensure fast molding cycles.
Millennium also debuted a PP low-profile powder for sheet and bulk molding compounds. Microthene FP 800-00 has a higher softening temperature than conventional polyethylene low-profile powders, cutting down cooling time before deflashing.
The additive also increases surface hardness, allowing the use of high-intensity flash removal systems to boost throughput.
Tel. (513) 530-6239, fax (513) 530-6119.
Cannon offers new diffuser technology
Cannon USA Inc. has begun offering a new technology for foaming the inside of refrigerators that uses a pipe-shaped mechanical diffuser.
The diffuser system can be used without changing an existing plant layout. It mounts at the currently used injection port, which is in the compressor area of the refrigerator.
Cannon said the technique reduces foam density compared with currently available systems.
Cannon USA of Cranberry Township, Pa., near Mars, Pa., said the diffuser is simpler and cheaper than the baricentric method of injecting that must be fixed with a reusable threaded external flange during pre-assembly of the cabinet.
Cannon said its engineers have proved the claims in tests at the firm's laboratory near Milan, Italy.
Tel. (412) 772-5600, fax (412) 776-1070.