C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/375
C08F 10/00 (2006.01) C08F 4/62 (2006.01) D01D 5/38 (2006.01)
Patent
CA 1049196
ABSTRACT OF THE DISCLOSURE : The invention relates to a process for the production of polymeric products in the from of fibrids, comprising polymeri- zing at least one compound containing at least one olefinic unsa- turation in the presence of a catalytic system comprising a redu- cing aluminium compound and a compound of a transition metal se- lected from the groups IV and VIII of the Periodic System, the aluminium compound being selected either among organometallic compounds having the general formula Al RxX3-x wherein R is an aryl, alkyl or cycloalkyl radical, X is a hydrocarbon radical or hydrogen, x is a whole or fractional number between 0 and 3 or among polymeric compounds of polyiminic nature containing repeat- ing units of the type (AlH-NR) where is R has the aforesaid mean- ing, the catalytic system having a Al Me ratio, wherein Me repre- sents the transition metal, ranging from 1 to 200 and a total concentration of the transition metal, ranging from 1 to 200 and a total concentration of the transition metal compound ranging from 0.001 to 5 mmoles/1, in a solvent selected among those ha- ving good solvent power for the monomer and low solvent power for the polymer which forms, at a temperature comprised between 0°C and -20°C, when the catalytic system comprises aluminium com- pounds AlRxX3-x and vanadium compounds, between 50°C and 90°C, when the catalytic system comprises a polyiminoalane and a tita- nium compound, and between -15°C and +90°C, when the catalytic system comprises a polyiminoalane and a vanadium compound. It is therefore possible to obtain fibrids directly during polymerisa- tion without application of shear stress. The fibrids of the pre- sent invention can be used as synthetic pulp for the production of papers.
198622
Baradel Agostino
Borri Carlo
Della Fortuna Giorgio
LandOfFree
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