Craft 31 plastics production

Koller Craft Plastic Products buys/sells off-specification or off-grade resins, regrind and obsolete or surplus virgin resins. They have been in business since 1941 and employ 70 people. They own a custom injection molder used primarily for large parts. 

Alkylation. Benzene and phenol feedstocks are readily alkylated under Friedel-Crafts conditions to prepare extensive families of alkylated aromatics. These materials generally are intermediates in the production of surfactants or detergents such as linear alkylbenzenesulfonate (LABS) and alkylphenolethoxylate (APE). Other uses include the production of antioxidants, plasticizers, and lube additives. 

As films are used e.g. the polymerization product of ethylbenzene and divinylbenzene (33) the copolymer of styrene and butadiene (755) the copolymer of styrene and butadiene mixed with polyethylene (157) a vulcanized or cyclized copolymer of an aromatic vinylcompound and an aliphatic conjugated polyene (2). As a crack resisting matrix is mentioned the copolymer of styrene, divinylbenzene and butadiene with e.g. dioctylphthalate as a plasticizer (176). Other examples are the copolymers of unsaturated aromatic compounds and unsaturated aliphatic compounds (77) and the reaction products of polyolefines and partially polymerized styrene (174). Primary groups can be introduced also with the help of Friedel-Crafts catalyst. Ts. Kuwata and co-workers treated a film of a copolymer of styrene and butadiene with an aluminium-ether complex and ethylenedichloride (79). Afterwards they allowed the film to react with trimethylamine. Another technique is the grafting of e.g. a polyethylene film with styrene (28). 

The interest of 2,6-dialkylnaphthalenes as starting materials in the production of polyester fibers and plastics with superior properties [1, 2] and of thermotropic liquid crystal polymers [3] is clearly shown by the increasing number of recent patents relevant to their preparation and separation[3.5]. However, the selective formation of 2,6-dialkylnaphthalenes is not obvious, not only with conventional Friedel-Crafts catalysts [6-8], but also over solid catalysts such as silica-alumina [9-11] or zeolites. 

Through Friedel-Crafts chlorination of biphenyl with FeCls as a catalyst, a total of 209 chlorobiphenyls can be obtained. The earlier importance of biphenyl for the production of polychlorinated biphenyls (PCB), with a chlorine content of around 50 to 55%, for plasticizers and transformer oils no longer exists today, since it was recognized in the late 1960 s that these compounds are not readily biodegradable and that their combustion at temperatures between 600 and 900 °C can release toxic dioxins. Production of polychlorinated biphenyls was therefore banned in a number of industrialized countries, e.g. in the USA in 1976. 

C -l,4-polyisoprenes are produced by depolymerizing polyisoprene or natural rubber. The material is used as a reactive plasticizer for adhesive tape, abrasive and friction products such as grinding wheels, and automobile brake linings, wire and cable sealants, and hot melt adhesives. The natural rubber product serves as a base for cold molding compounds for arts and crafts, asphalt modifier, as potting, or in molds. 

In this section, we have considered how plastic can be portrayed as a material that has served in the differentiation of the sociomaterial spaces of industrial workplace and home, and between the practices of production, craft and consumption. At the same time, we have also noted that these divisions are not simple that craft attaches to the way that even the most mundane and putatively skill-less plastic artefacts are put to work, not least when craft is understood in terms of a heterogeneous performativity that straddles both the practical and the expressive. As such, we have moved from a... 

Sometimes chemists need to change the structure of an arene in order to make a new product. Examples include the manufacture of detergents or the reactants needed to make plastics, such as poly(phenylethene) - commonly known as polystyrene. They can use a Friedel-Crafts reaction to substitute a hydrogen in the benzene ring for an alkyl group, such as a methyl (—CH3) or an ethyl (—CjHj) group ... 

Hand appUcation of fabrics or leathers to plastic enclosures has been done for some time. For this process, the surface material is applied to the part using thermal adhesives. A craftsman then cuts and contours the surface material, producing a part with a hand-crafted appearance. Typical volumes are less than 50,000 pieces per year. The process is labor intensive but does not require extensive coital equipment for the application of the fabric. This process is well suited for custom, low volume applications. The method is not well suited for mass production. 

---