Abstract: This invention refers to a process for the preparation of a 1,3-butadiene and styrene copolymer, containing a random section in its main chain, followed by a block with a structure differentiated from the main chain, homopolymeric or copolymeric, functionalized, and the product obtained from this.
Type:
Application
Filed:
December 11, 2008
Publication date:
June 2, 2011
Applicant:
PETROFLEX INDUSTRIA E COMERCIO S.A.
Inventors:
Luiz Fernando Nicolini, Clovis Henriques de Lira, Carlos Roberto de Albuquerque Campos, Fernando Vasconcelos Figueiredo, Mauro Cresta de Barros Dolinsky, Neusa Maria Toccheto Pires, Monica de Almeida de Sant'Anna
Abstract: A new process for the preparation of neodymium neodecanoate, which is utilized as the metallic component, in a new process for the preparation of three-component homogeneous catalytic systems. The invention also deals with a solution polymerization process for the preparation of polybutadiene with a high content of the 1,4-cis units.
Type:
Grant
Filed:
May 16, 2000
Date of Patent:
November 19, 2002
Assignee:
Petroflex Industria E Comércio
Inventors:
Neusa Maria Tocchetto Pires, Luiz Fernando Nicolini, Clóvis Henriques De Lira, Carlos Roberto De Albuquerque Campos, Paulo Luiz De Andrade Coutinho
Abstract: Process for the production of hydrated aluminae through the precipitation of aluminum hydroxide in a reactor by the reaction of an aluminum compound soluble in a polar solvent with a precipitating agent, also solubilized in the polar solvent, in constant conditions of pH, temperature, concentration and agitation; concentration of the suspension of precipitated aluminum hydroxide; crystallization in an alkaline pH, essentially constant; separation of the crystallized aluminum hydroxide, for later washing and drying. The product obtained is homogeneous and with excellent characteristics for utilization in the manufacturing of catalysts and catalytic supports. The process can be applied, advantageously, in the treatment of the acid waste from processes which utilize Friedel-Crafts type reactions, obtaining, in addition to the hydrated alumina, a liquid effluent with low metal contents.
Type:
Grant
Filed:
May 4, 1987
Date of Patent:
July 18, 1989
Assignee:
Petroflex, Industria E Comercio S.A.
Inventors:
Antonio L. R. de Castro Morshbacker, Dante F. F. Filho, Joaquim M. F. Filho, Marcus C. da Fonseca, Ricardo T. de Mello