OJSC Efremov Synthetic Rubber Enterprise

Ефремовский завод синтетического каучука

ГОСТ 13303-86

High molecular weight Polyisobutene (Polyisobutylene)

TECHNICAL DATA

Seven grades of high molecular weight polyisobutene are produced with different molecular masses. Technical data of the product is shown in the table:

TECHNICAL DATA
Properties Values
P-80 P-85 P-100 P-118 P-155 P-220 P-225
Apperance Rubber-like with colour ranging from white to grey
Staudinger molecular mass×103 71 … 94 59 … 104 104 … 131 106 … 159 153 … 206 170 … 243 221 … 260
Staudinger Index (Io), cm3/g 178 … 236 150 … 260 260 … 325 265 … 395 380 … 510 420 … 600 550 … 640
Viscosity-Average molecular mass, Mv, (×103) 619 … 965 476 … 1110 900 … 1564 1143 … 2112 1989 … 3128 2331 … 4017 3512 … 4435
Number-Average molecular weight, Mn,(×103) 161 … 217 134 … 241 192 … 305 246 … 376 361 … 493 401 … 586 535 … 628
Ash mass content, %, max 0,04
Volatile matter at 105°C, %, max 0,5
Non-staining stabilizer content, %, max 0,04

BASIC DATA

High molecular weight polyisobutene is a solid rubber­like substance; it retains its resilient and high elastic properties and belongs to "the elastomers" in contrast to such polyolefines as polyethylene, polypropylene, polybutene, which belong to "thermoelasticoplasts".

High molecular weight polyisobutene is a product of the method of low temperature polymerization with evaporating liquid ethylene and in presence of catalyst boron trifluoride and together with the process regulators.

Polymerization is performed on continuously moving line at temperature minus 100 °C. Heat removal is performed by means of liquid ethylene evaporation. Gas phase is sent to gasholder and is further recycled, purified for use

CHEMICAL PROPERTIES

Polyisobutene is a saturated carbon-chain polymer. As such it is highly resistant to oxygen, ozone, and solutions of acids, alkalis and salts. The polymer doesn't swell or dissolve in oxygen containing polar solvents, but readily dissolved in aliphatic or aromatic hydrocarbons (passing through a swelling stage).

PHYSICAL AND PROCESSING PROPERTIES

High molecular weight polyisobutene is an elastic rub­ber-like product, nearly colorless and free of odor or taste, density — 0.91 ...0.93 g/cm3.

When heated in air up to 100 °C over a long period of time polyisobutene becomes increasingly plastic, at 180...200 °C it can be shaped. At 350...400 °C thermal degradation occurs with evolution of oily gaseous products. Polyisobutene retains its resilient and elastic properties down to -55 °C, it remains practically unchanged after immersion in water or at elevated tempera­tures.

Being a non-polar substance of regular macromolecular structure, polyisobutene shows good dielectric properties. In common with other rubbers polyisobutene can be mixed with variable ingredients, thermoplastic polymers that fully reduce cold flow and improve dielectric properties.

APPLICATION FIELDS

The outstanding chemical stability of polyisobutene has won it a place in the forefront of rubbers used for corrosion protection of equipment, for manufacturing of seals, rubber things, insulating materials, adhesives, covers and many other products.

PACKING, TRANSPORTATION AND STORAGE.

Polyisobutene is produced in bales of 25 ±1 kg or 30 ±1 kg which are packed in polyethylene film and then in metal or wooden containers, laid by polyethylene film, or it is packed into paper bags with 4-6 layers. Polyisobutene can be transported by any kind of covered transportation means. Polyisobutene is stored in closed warehouses at temperature 25 °C. Guaranteed period of storage — 2 years.

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