C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/2043
C08G 81/02 (2006.01) C08F 297/04 (2006.01)
Patent
CA 1290873
ABSTRACT OF THE DISCLOSURE: Bimodal star-block copolymers are disclosed, containing from 60 to 90% by weight of an aromatic vinyl monomer and from 40 to 10% by weight of a conjugated diene, these copolymers having the general formula: (S - S1 - B/S2 - B1)m - X - (B1 - S2/B - S1)n wherein X is a polyfunctional redical, m and n are integers (being m ? n) the sum of which is between 3 and 20 and equal to the functionality degree of the radical X, S and S1 are polymer blocks of an aromatic vinyl monomer, B1 is an elastomeric copolymer of conjugated dienic units, containing up to 20% of all the dienic units of the copolymer, and B/S2 and S2/B are blocks of copolymers of aromatic vinyl monomer and conjugated diene of the ramdom and/or tapered type. The copolymers according to the invention are thermoplastic, wholly transparent, highly resilient, that is impact- resistant, and show excellent optical properties.
542131
Callaioli Andrea
Corrado Francesco
Nocci Roberto
Rendina Gabriele
Callaioli Andrea
Corrado Francesco
Montedipe S.p.a.
Nocci Roberto
Rendina Gabriele
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