Another synthetic polymer, sometimes called by the same general category, is acetal resin. By contrast with the other synthetics, however, it has a simple chain structure with the repeat unit of form −[CH 2 O]−. Ion exchange resins are used in water purification and catalysis of organic reactions. See also AT10 resin, melamine resin.Cyclic olefin copolymer (COC) is an amorphous polymer made by several polymer manufacturers.COC is a relatively new class of polymers as compared to commodities such as polypropylene and polyethylene.This newer material is used in a wide variety of applications including packaging films, lenses, vials, displays, and medical devices.
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