Enichem Elastomeri S.p.a.

Enichem Elastomeri Srl

Enichem Elastomeric S.r.l.

Alessandro Zazzetta

Sergio Custro

Enrico Agostinis

Elio Diani

A branched block copolymer is described, which can be defined by the formula (B.sub.1 -T-A-B.sub.2).sub.n X, where B.sub.1, and B.sub.2 are polydiene blocks, A is an aromatic polyvinyl block, T is a random copolymer segment made up of dienic monomeric and aromatic vinyl units, X is a coupling radical having a valence equal to n, and n is a whole number ranging from 3 to 20. This kind of block copolymer is used in formulations of adhesives having an excellent balance of adhesive, cohesive, rheological characteristics, as well as resistance to heat oxidation, and in compositions together with thermoplastic polymers capable of giving products with improved shock resistance and transparency.

Branched block copolymer, procedures for its preparation and use

A branched block copolymer is described, which can be defined by the formula (B.sub.1 --T--A--B.sub.2).sub.n X, where B.sub.1 and B.sub.2 are polydiene blocks, A is an aromatic polyvinyl block, T is a random copolymer segment made up of dienic monomeric and aromatic vinyl units, X is a coupling radical having a valence equal to n, and n is a whole number ranging from 3 to 20. This kind of block copolymer is used in formulations of adhesives having an excellent balance of adhesive, cohesive, rheological characteristics, as well as resistance to heat oxidation, and in compositions together with thermoplastic polymers capable of giving products with improved shock resistance and transparency.

Branched block, copolymer, procedures for its preparation and use

Polymeric compositions and method for preparing them

Styrene-isoprene block copolymers

Radial and branched block copolymers show a structure: ##STR1## wherein: Z is a radical deriving from a tetrafunctional coupling agent;

Radial and branched block copolymers, compositions which contain them,

Linear copolymers with four alternating blocks, represented by the following formula:

Linear alternating-block copolymers

A linear copolymer constituted by four alternating blocks:

Growing community of inventors

Cesena, Italy

Alessandro Zazzetta