METHYLALUMINOXANE Property

Boiling point:

111 °C

Density 

0.875 g/mL at 25 °C

vapor pressure 

0.76 mm Hg ( 60 °C)

storage temp. 

2-8°C

Safety

Hazard Codes 

F,C,Xn

Risk Statements 

11-14-17-34-48/20-63-65-67-38

Safety Statements 

26-36/37/39-45-62-36/37

RIDADR 

UN 3394 4.2/PG 1

WGK Germany 

2

HS Code 

29310099

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H228Flammable solid

H250Catches fire spontaneously if exposed to air

H252Self-heating in large quantities; may catch fire

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P222Do not allow contact with air.

P235+P410Keep cool. Protect from sunlight.

P240Ground/bond container and receiving equipment.

P241Use explosion-proof electrical/ventilating/lighting/…/equipment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P302+P334IF ON SKIN: Immerse in cool water/wrap in wet bandages.

P370+P378In case of fire: Use … for extinction.

P407Maintain air gap between stacks/pallets.

P413Store bulk masses greater than … kg/…lbs at temperatures not exceeding … oC/…oF.

P420Store away from other materials.

P422Store contents under …

METHYLALUMINOXANE Chemical Properties,Usage,Production

Description

Methylaluminoxane (MAO) is by far the industrially most significant aluminoxane. The direct hydrolysis of trimethylaluminum (TMA) with water, however, is extremely exothermic and difficult to control. Thus, small scale, continuous processes, rather than large scale batch processes, are used for the direct hydrolysis of TMA to MAO. MAO can also be produced by reaction of TMA with organic acids, ketones, or carbon dioxide. The synthesis of MAO from TMA and CO2 actually has substantial literature precedent. Carbonation of an organoaluminum compound with carbon dioxide forms an aluminum carboxylate. 

Chemical Properties

Clear colorless solution

Mechanism of action

The role of Methylaluminoxane in metallocene catalyst polymerization is fourfold. First, it alkylates the transition metal. Second, it extracts an alkyl group from the transition metal to generate an active cationic polymerization catalyst. Third, it acts as a bulky, inert anion to the highly reactive transition metal cation. Fourth, it scavenges impurities from the polymerization reactor.