Polymethylpentane (PM) is a thermoplastic polymer of 4-methyl-1-pentane. It is used for gas permeable packaging, autoclavable medical and laboratory equipment, microwave components, and cookware. Polymethylpentene has a very low density and moisture absorption. However, its acoustical and electrical properties are exceptional. It also high a high thermal stability, excellent dielectric characteristics and a high chemical resistance.
Properties of Polymethylpentane
- Excellent high resistance
- Good peelability/non-compatibility
- Low Refractive Index
- High gas permeability
- Has lowest density among all thermoplastic resins
- Excellent steam resistance
- Excellent chemical resistance
- Low-dielectric properties
- Low refracative index and resin FDA complian
- Polymethylpentene is a 4-methyl-1-pentene based linear isotactic polyolefin that can be manufactured using the Ziegler-Natta type catalysis. The Ziegler – Natta catalyst is used in the synthesis of polyme of 1-alkenes (α-olefins).
- Polymethylpentene can be extruded and molded (by injection molding or blow molding)
PMP is used in many food containers because it has good releasability following fluorine resin. It prevents the stain, colors, and smells of food from remaining in a container. Furthermore, it has excellent heat resistance and can withstand cooking oily food in a microwave oven.
PMP is used for molding FPC substrates and has widespread application for release films. While boasting high heat resistance, PMP also features low heat distortion temperature, which enables it to follow minute protrusions and recesses of FPC substrate surface. This stops adhesive leaking to the circuit section during the pressing process. PMP is also more releasable than other materials, simplifying releasing tasks.
PMP is applied widely for process materials for rubber hose manufacturing process (sheaths and mandrels). PMP features excellent heat resistance and enables high temperature vulcanization. PMP mandrels ensure high precision of the hose’s inner diameter while PMP sheaths enable mirror finishing of the hose’s exterior. Both mandrels and sheaths can be used repeatedly, enabling manufacturing costs to be lowered.
Because of its stable C-C bonds, PMP has better chemical resistance compared with PC/PMMA materials. PMP basically shows excellent chemical resistance, particularly against acids, alkalis, and alcohols. For this reason, PMP is also used for experimental apparatus.
PMP is used for hollow fiber due to its gas permeability. PMP is characterized by its excellent gas permeability, which derives from its molecular structure. This gives PMP broad gas permeative applications, such as hollow fiber for artificial lungs and gas separation membranes for sewage treatment facilities.
Due to its heat resistance, transparency, light weight, PMP also used for animal cages. PMP has also found medical-related applications, signifying that the cages have a minimal effect on living things.
Given its characteristics, PMP is used for resin modifier. Above all, its superior heat resistance and releasability enable it to be used for electronic materials and special printing paper. When PMP is added to another resin and then stretched, an even void is created between the PMP and the resin. This helps improve the printability and optical properties.