Versatile new modifiers for reactive extrusion.A new family of materials is said to allow production of new types of acrylic or styrenic block copolymers, as well as improved versions of existing copolymers with tighter control of molecular weight and sequencing of monomer monomer (mŏn`əmər): see polymer. monomer Molecule of any of a class of mostly organic compounds that can react with other molecules of the same or other compounds to form very large molecules (polymers). units. New BlocBuilder technology from Arkema Inc.'s Organic Peroxides Organic peroxides are organic compounds containing the peroxide functional group (ROOR'). If the R' is hydrogen, the compound is called an organic hydroperoxide. Peresters have general structure RC(O)OOR. unit, Philadelphia, will be available in three forms: * BlocBuilder nitroxide compounds--a reaction controller and free-radical initiator in one molecule--are available to resin producers for making block copolymers. * Developmental FlexiBloc Living Polymers--reactive prepolymers made with BlocBuilder--are offered to compounders and resin producers for reactive extrusion and chain extension. * Specialty block copolymers made with BlocBuilder are being developed by Arkema for sale to molders, extruders, and compounders. Developed by Arkema's French parent, BlocBuilder nitroxides are non-toxic, non-corrosive compounds that impart no odor or discoloration dis·col·or·a·tion n. 1. a. The act of discoloring. b. The condition of being discolored. 2. A discolored spot, smudge, or area; a stain. Noun 1. , unlike other radical polymerization Radical polymerization is a type of polymerization in which the reactive center of a polymer chain consists of a radical. The polymerization reaction is initiated by three classes of free-radical initiators: Arkema uses BlocBuilder technology to make its new Nanostrength acrylic copolymer tougheners and compatibilizers (reported in January). BlocBuilder could also be used to enhance flow, paintability, scratch resistance, or adhesive properties. The latter could be used in tie-layer resins, TPEs for hard/soft overmolding, or for pretreating nanoctays or wood fibers. Arkema's first FlexiBloc prepolymer for reactive extrusion is a developmental butyl butyl /bu·tyl/ (bu´t'l) a hydrocarbon radical, C4H9. bu·tyl n. A hydrocarbon radical, C4H9. butyl a hydrocarbon radical, C4H9. acrylate Noun 1. acrylate - a salt or ester of propenoic acid propenoate salt - a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal) that can be used to build heat- and uv-stable toughening into the backbone of a block copolymer. It has reactive nitroxide end groups that are stable at room temperature and reactive only above a certain temperature--an attractive characteristic of nitroxides in general. Tel: (800) 558-5575 * PTDirect: 187ZD |
|
||||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion