Stereoblock diene copolymers and preparation process thereof
OwnerAdriano Malacchini, Giovanni Ricci +1inventors
InventorsAdriano Malacchini, Giovanni Ricci, Giuseppe Leone
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Abstract
The invention relates to isoprene and butadiene and/or pentadiene stereoblock copolymers in which the different stereoregular blocks, joined to each other by means of a single junction point, have different structures and thermal properties. The invention also relates to a process for the preparation of the aforesaid copolymers which comprises the formation of stereoblocks in successive steps but in the presence of a single catalytic system obtained from cobalt dichloride, a phosphine and an organic compound of aluminum.
Claims21
1-22. (canceled)
A composition of stereoblock copolymers having a general formula (I)
- wherein:
- PI is a 1,4-cis/3,4 polyisoprene block with an alternating structure;
- PB is a polybutadiene block with a syndiotactic 1,2 structure in which the content in 1,2 units is ≥80%;
- PP is a polypentadiene block with a syndiotactic 1,2 structure in which the content in 1,2 units is ≥90%;
- m, n, and z are equal to 1 or equal to 0 according to the following conditions:
- m and n are simultaneously equal to 1 or alternatively m is equal to 1 and n is equal to zero, or m is equal to 0 and n is equal to 1;
- if m is equal to 1, z is equal to 0 and n is equal to 1 or 0;
- if m is equal to 0, n is equal to 1, and z is equal to 1 or equal to 0.
Dependencies are inferred from the claim text.