The abbreviation TPX scientific name is poly4-methylpentene-1 monomer 4-methylpentene-1 natural color poly4-methylpentene-1 is a highly crystalline transparent plastic with a specific gravity of 0.83 , the lightest of all plastics. The surface hardness is low and non-toxic. The light transmission performance is between that of organic glass and polystyrene. Combustion characteristics: Can burn, continue to burn slowly after leaving the fire, with molten dripping. Advantages: The light transmittance of TPX does not change with changes in processing conditions, nor does it change with the thickness of the product. Therefore, it is suitable for making transparent products. It has high rigidity, exceeding polypropylene when the temperature is above 100℃; exceeding PC when the temperature is above 150℃. Basic introduction Chinese name: TPX Temperature: 160℃-180℃ Pressure: 30-50kg/㎝2 Preload: 5-10sec Introduction, characteristics, Basic characteristics, market application, specific uses, processing technology, instructions for use, introduction TPX is a polymer of 4-methylpentene (4-methylpentene-1) produced by Mitsui Chemicals Co., Ltd. of Japan, TPX is its trade name, chemical The name is Methyl pentene copolymer, or PMP for short. Mitsui Chemicals Co., Ltd. is the only manufacturer of TPX in the world; density: 0.82-0.83; water absorption: 0.01%; melting point: 240°C; Vicat softening point 160°C ~ 170°C; shrinkage Rate: 1.5% ~ 3.0%; Transmittance: 90% ~ 92% (the only crystalline polymer among currently commercialized high-transparency resins); Characteristics (high temperature resistance, clear and transparent, high melting point, chemical resistance, Acid resistance, alcohol resistance, impact resistance): ⒈Comparison at high temperatures: quite high elongation at break, impact resistance, superior creep resistance (high rigidity); a. More than PP at 100℃ or above; b. 130℃ It can be used for one year in the environment; c. It can be used for 100 hours in the environment of 180℃. ⒉ Electrical insulation: (TPX molecules have no polar groups) a. Dielectric strength: 65KV/mm (better than PTFE and propylene); b. Dielectric constant: 2.12 (PTFE dielectric constant is 2.0~2.1); ⒊ Chemical resistance: acid, alkali, edible oil; (low water absorption: extremely high tolerance to water and water vapor) ⒋Hygienic safety: non-toxic, in line with US FDA certification; TPX electrical insulation properties Better than polypropylene. Resistant to acids and alkalis, chemical corrosion, organic solvents, and stress cracking. There is no tendency for other transparent materials to suffer from stress cracking due to the action of detergents during use. TPX can be steamed and sterilized at 130°C 400 times without fogging. It can withstand hot air sterilization at 160°C 50 times in one hour. It can also be sterilized at temperatures above 200°C. It can also withstand ethylene oxide and radiation sterilization. Disadvantages: poor environmental resistance, easily oxidized, degraded by radiation after exposure to light, and turns yellow when exposed to heat. Applicable to transparent medical equipment, microwave tableware and ordinary tableware. TPX also has good fiber-forming properties and a wide range of raw materials. Therefore, some people call it "poor man's nylon". Injection molding characteristics: TPX is a crystalline polymer with an obvious melting point. It can generally be melted when heated to 235°C. During injection molding, the general operating temperature is 260°C--300°C. TPX does not absorb water and generally does not need to be dried. Sometimes for the sake of product quality, it can be dried at a temperature of 60°C for 30 minutes to 1 hour to discharge floating water in the raw materials. The shrinkage rate of TPX is 22‰; Basic properties of poly(4-methylpentene) The use of Ziegler-Natta catalysts such as TiCl3/AlCl3/Al(C2H5)2Cl system can polymerize 4-methylpentene into poly(4-methylpentene) -methylpentene), generally, the obtained poly(4-methylpentene) has a head-to-tail structure and an isotactic stereoregular structure. Stereoregularity gives poly(4-methylpentene) a fairly high degree of crystallinity. Poly(4-methylpentene) has a crystal structure composed of polymer chains wound into a helix, with each two-turn helix containing seven monomer units. The only stable crystalline form is tetragonal, with each unit lattice containing four polymer chains and twenty-eight monomer units. The parameters of the lattice are a=18.6-18.7 A and b=13.8 A.

Theoretically, the density of its crystals is 0.812-0.813 g/cm3, which can be said to be one of the lowest among polymers. The main reason why the density of the crystalline part of poly(4-methylpentene) is so low is that the arrangement of the polymer helices is quite loosely packed. At room temperature, the density of the amorphous part of poly(4-methylpentene) is 0.838 g/cm3, while the density of the crystalline part is about 0.813g/cm3, and the overall polymer density is about 0.830 g/cm3 . This crystalline phase has a lower density than the amorphous phase and is similar to the properties of water (frozen has a lower density than water). Poly(4-methylpentene) is also the only semi-crystalline polymer with an average density greater than the crystalline part. Impact TPX is a commercial poly(4-methylpentene) resin, usually a polymer of 4-methylpentene and several wt% α-olefins (such as hexene). Taking hexene as an example, the hexene monomer unit in the polymer can easily replace the 4-methylpentene unit in the polymer helix without affecting the crystal structure and properties. Therefore, the crystalline properties of *** polymers containing 5-10 mol% hexene, such as melting point and crystallinity, are somewhat similar to poly(4-methylpentene) homopolymers, as shown in Table 1. The Tg of poly(4-methylpentene) homopolymer is about 50°C, while the Tg of some polymers drops to 20-30°C. Generally speaking, semi-crystalline polymers form opaque or translucent materials due to the difference in refractive index between the crystalline part and the amorphous part, as well as the scattering of light by the crystalline part. However, poly(4-methylpentene) has a very high transparency, with a light transmittance of 90-92%, which is comparable to amorphous polystyrene (PS) and polymethylmethacrylate (PMMA). The high transparency of poly(4-methylpentene) is mainly due to the low optical anisotropy of the molecules in the helical configuration of the crystalline phase and the close density and refractive index of the crystalline part and the amorphous part. . The refractive index of the crystalline part and the amorphous part are very close, making the material highly isotropic. Therefore, TPX has become the only crystalline polymer among the currently commercialized high-transparency resins. High transparency, excellent heat resistance and low specific gravity can be said to be the most unique properties of TPX. Application Market Currently, the annual usage of TPX around the world is about 6,000T, mainly in the European, American and Japanese markets. In the past, Taiwan's industry was not familiar with TPX materials, and the main reasons for using TPX were usually specified by foreign manufacturers. Therefore, a few years ago, the usage of TPX in Taiwan was not large, with an annual usage of about 10 tons, and its uses were limited to microwave tableware, transparent cosmetic containers and medical equipment. However, with the development of Taiwan's electronics industry, Taiwan's TPX usage has grown significantly in recent years. The release properties and temperature resistance of TPX make it an excellent mold material for epoxy tree limb packaging. In 2000, Taiwan used approximately 90 hectares of TPX to manufacture LED packaging molds. In the electronic packaging industry, some heat-resistant release papers or films are often used. Release films made of TPX are popular because of their excellent temperature resistance. In 2000, Taiwan's industry used approximately 50 hectares of release film. In addition, the dielectric constant of TPX is very low, so some TPX is used to make high-frequency connectors. Therefore, the current annual usage of TPX in Taiwan is approximately 150 metric tons, and the usage is expected to continue to grow in the future. Specific uses: ⒈ beakers, petri dishes, incubators (transparency, chemical resistance, water vapor permeability); ⒉ cosmetic containers, bottle caps (flavor) (it does not have a plastic smell and will not interfere with the original aroma); ⒊ microwave lunch boxes , food containers (non-toxic, good temperature resistance, no absorption of microwaves); ⒋Electronics, electrical parts, LED mold strips, coated cables (insulation, extrusion grade); ⒌Medical equipment: speculum tubes, syringes (hygiene); ⒍Oven appliances (high temperature); ⒎Film (extrusion grade) Processing technology ⒈Injection molding process: Material temperature: 260℃~300℃; Mold temperature: 70℃; It is recommended to choose the screw aspect ratio of the injection molding machine: L/P=20 above.

⒉Blow molding ⒊Extrusion molding Instructions for use 1. Name and specifications Product name: TPX release film Packaging specifications: Carton packaging, 590mm×640mm×2000pcs/carton Registered trademark 2. Product function: Protect FPC products from line breaks, wrinkles, stains, glue overflow, etc. during the manufacturing process. 3. Operation steps: Cut the release film into the required dimensions. Use a brush to lightly brush (or suck with a suction gun) the surface of the FPC to remove lint or impurities. Place the release film according to the position and position of the work instructions and inspection standard card. It is stipulated that the stacking and fixation should be aligned. The stacked semi-finished products are sent to the hot pressing station for pressing. 4. Traditional pressing conditions: Temperature: 145℃; Pressure: 30Kg - 40Kg; Time: 60 min Rapid pressing conditions: , forming pressure: 60~180sec, aging: 175℃/2hr 5. Operation Precautions: TPX release film is often used for quick pressing. During operation, attention must be paid to the cleanliness of the joint interface between the release film and FCCL. Do not place work tools on the product, otherwise it may cause scratches or crushing. 6. Storage of raw materials Condition temperature: < 25 ℃; Humidity: < 65%; Storage time: 12 months. 7. Safety precautions: Keep away from open flames and handle with care.