Polypropylene (PP)
9/21/2008
“Polypropylene or polypropene (PP) is a thermoplastic polymer, made by the
chemical industry and used in a wide variety of applications, including
packaging, textiles (e.g., ropes, thermal underwear and carpets), stationery,
plastic parts and reusable containers of various types, laboratory equipment,
loudspeakers, automotive components, and polymer banknotes. An addition polymer
made from the monomer propylene, it is rugged and unusually resistant to many
chemical solvents, bases and acids. Polypropene is commonly recycled, and has
the number "5" as its recycling symbol:
.”
Wikipedia:
http://en.wikipedia.org/wiki/Polypropylene (11/9/2008)
Ethylene Propylene Diene Monomer Copolymers (EPDM)
Warning: Sometimes the older links no longer work. Go to the US Patent Patent number search page, copy the Patent number into the search box and search. For the articles, use your browser to go the Journal site.
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Notes
“Melt
processing of polypropylene can be achieved via extrusion and molding. Common
extrusion methods include production of melt blown and spun bond fibers to form
long rolls for future conversion into a wide range of useful products such as
face masks, filters, nappies and wipes.”
Wikipedia:
http://en.wikipedia.org/wiki/Polypropylene (11/9/2008)
“The most
common shaping technique is injection molding, which is used for parts such as
cups, cutlery, vials, caps, containers, housewares and automotive parts such as
batteries. The related techniques of blow molding and injection-stretch blow
molding are also used, which involve both extrusion and molding.”
Wikipedia:
http://en.wikipedia.org/wiki/Polypropylene (11/9/2008)
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“The large
number of end use applications for PP are often possible because of the ability
to tailor grades with specific molecular properties and additives during its
manufacture. For example, antistatic additives can be added to help PP surfaces
resist dust and dirt. Many physical finishing techniques can also be used on PP,
such as machining. Surface treatments can be applied to PP parts in order to
promote adhesion of printing ink and paints.”
Wikipedia:
http://en.wikipedia.org/wiki/Polypropylene (11/9/2008)
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Review Articles
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US Patents
12/16/2008
7,465,776
High crystallinity, high melt flow rate polypropylene
12/2/2008
7,459,503
Process for production of modified propylene polymers and modified propylene
polymers produced by the process
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Journal Articles
1/23/2009
Stress-induced changes in microstructure of a
low-crystalline polypropylene investigated at uniaxial stretching
(p 188-199)
Journal of Applied Polymer Science 112 #1 (2009)
Abstract
9/26/2008
Improvement of thermal and fire properties of polypropylene
(p 2971-2979)
Journal of Applied Polymer Science 110 #5 (2008)
Abstract
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Roger D. Corneliussen
Editor
Telephone: 610 883 0055
rcorneliussen@4spe.org
www.maropolymeronline.com
Copyright 2008 by Roger D. Corneliussen