The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 1998
Filed:
Feb. 24, 1997
Applicant:
Inventors:
Roberto Santi, Novara, IT;
Giuseppe Cometti, Verbania, IT;
Riccardo Po', Livrono, IT;
Nicoletta Cardi, Novara, IT;
Assignee:
Enichem S.p.A., Milan, IT;
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C07F / ;
U.S. Cl.
CPC ...
526133 ; 526134 ; 526153 ; 526160 ; 526170 ; 526346 ; 5263472 ; 526943 ; 556 52 ; 502103 ; 502132 ; 502152 ; 502153 ; 502154 ;
Abstract
Process for the preparation of crystalline vinylaromatic polymers with a predominant syndiotactic structure which involves polymerizing vinylaromatic monomers in the presence of a catalytic system comprising: a titanium complex having general formula (I): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4, the same or different, represent a hydrogen atom or a C.sub.1 -C.sub.20 alkyl radical or a C.sub.6 -C.sub.20 arylalkyl or aryl radical, on the condition that at least one of these is different from hydrogen.