9010-85-9

Basic information

• Product Name: EXXON BUTYL RUBBER 065
• Synonyms: 1,3-Butadiene,2-methyl-,polymerwith2-methyl-1-propene;3-butadiene,2-methyl-polymerwith2-methyl-1-propene;Butylrubber;POLY(ISOBUTYLENE-CO-ISOPRENE);LANXESS BUTYL 100;LANXESS BUTYL 101-3;LANXESS BUTYL 301;LANXESS BUTYL 402
• CAS NO: 9010-85-9
• Molecular Formula: (C5H8)x.(C4H8)x
• Molecular Weight: 56.10630
• Product Categories: Polymers
• Mol File: 9010-85-9.mol
• Article Data: 0

Chemical Properties

• Boiling Point: 34.1°C at 760 mmHg
• Appearance: /
• Vapor Pressure: 549mmHg at 25°C
• CAS DataBase Reference: EXXON BUTYL RUBBER 065(CAS DataBase Reference)
• NIST Chemistry Reference: EXXON BUTYL RUBBER 065(9010-85-9)
• EPA Substance Registry System: EXXON BUTYL RUBBER 065(9010-85-9)

Safety Data

• Statements: 10
• Safety Statements: 16
• Hazardous Substances Data: 9010-85-9(Hazardous Substances Data)

Usage

Description

EXXON BUTYL RUBBER 065 is a synthetic copolymer that contains 0.5 to 2.0 molar percent of isoprene, with the remainder consisting of isobutylene. It is prepared by copolymerization of isobutylene and isoprene in methyl chloride solution, using aluminum chloride as the catalyst. After polymerization, the rubber particles are treated with hot water containing a food-grade deagglomerating agent, such as stearic acid, and then dried to remove residual volatiles.

Uses

Used in Tire Industry:
EXXON BUTYL RUBBER 065 is used as a key component in the production of inner tubes and tires due to its high impermeability to gases, making it the best-suited rubber for these applications.
Used in Air Chambers:
EXXON BUTYL RUBBER 065 is used as a material for air chambers because of its excellent gas barrier properties, ensuring the retention of air and maintaining the structural integrity of the chamber.
Used in Adhesives:
EXXON BUTYL RUBBER 065 is used as a component in adhesive formulations, providing excellent adhesion and bonding properties, as well as resistance to gas permeation.
Used in Dielectrics:
EXXON BUTYL RUBBER 065 is used in the manufacturing of dielectric materials, offering excellent electrical insulation properties and resistance to gas permeation, making it suitable for various electrical applications.
Note: While the provided materials mention that isobutene can be hazardous in high concentrations, it is important to follow safety guidelines and regulations when handling and using EXXON BUTYL RUBBER 065.

Preparation

Commercial butyl rubbers generally contain 1-3 mole % isoprene. In a typical process, a solution of the monomers in methyl chloride is pre-cooled to -lOO°C and then fed continuously into the base of a reactor together with a solution of aluminium chloride (initiator) in the same diluent. The reaction is highly exothermic and in order to maintain the temperature at -100°C the reactor is fitted with a powerful stirrer and cooling coils containing liquid ethylene. The polymer forms as a granular slurry which is displaced continuously from the top of the reactor. The slurry passes into a flash tank where it is vigorously agitated with hot water. This treatment deactivates the initiator and extracts water-soluble products. At the same time the diluent and unreacted monomers are flashed off and are purified and re-used. Also at this point a lubricant and an antioxidant are introduced into the polymer. The lubricant, usually zinc stearate, prevents agglomeration of wet crumb and the antioxidant, usually phenyl-p-naphthylamine, reduces degradation during drying operations. The slurry then passes to a screen where wet polymer crumb is isolated. The crumb is dried at about 95-170°C, fed through an extruder and then hot milled. The object of these last operations is to compact the polymer and remove all traces of residual water. In butyl rubber the isoprene is present as random l,4-units and the copolymer thus has the following form:

Production Methods

The bulk of butyl rubber is made by a slurry process using aluminum chloride at 98–99°C and methyl chloride as a diluent. The extremely rapid reaction is unique, and proceeds via cationic polymerization to completion at 100°C in less than a second. Butyl rubber may be vulcanized by three basic methods: accelerated sulfur vulcanization, cross-linking with dioxime and related dinitroso compounds, and polymethylol– phenol resin cure. Halogenated butyl rubber allows broadened vulcanization latitude and rate, and enhanced covulcanization to general-purpose elastomers while it maintains the unique attributes of the basic butyl molecule.

InChI:InChI=1/C5H8.C4H8/c1-4-5(2)3;1-4(2)3/h4H,1-2H2,3H3;1H2,2-3H3