US 12,435,204 B2
Compositions for elastomeric compounds including polytetrazole cross-linking agents and tyres comprising the same
Luca Giannini, Milan (IT); Luciano Tadiello, Milan (IT); Antonio Papagni, Milan (IT); and Mauro Monti, Milan (IT)
Assigned to PIRELLI TYRE S.p.A., Milan (IT)
Appl. No. 17/757,909
Filed by Pirelli Tyre S.p.A., Milan (IT)
PCT Filed Dec. 29, 2020, PCT No. PCT/IB2020/062501
§ 371(c)(1), (2) Date Jun. 23, 2022,
PCT Pub. No. WO2021/137143, PCT Pub. Date Jul. 8, 2021.
Claims priority of application No. 102019000025804 (IT), filed on Dec. 30, 2019.
Prior Publication US 2023/0058851 A1, Feb. 23, 2023
Prior Publication US 2025/0230297 A2, Jul. 17, 2025
Int. Cl. C08K 5/3472 (2006.01); B60C 1/00 (2006.01); C08K 3/04 (2006.01); C08K 3/36 (2006.01)
CPC C08K 5/3472 (2013.01) [B60C 1/00 (2013.01); C08K 3/04 (2013.01); C08K 3/36 (2013.01)] 20 Claims
 
1. An elastomeric composition for tyre compounds comprising at least:
100 phr of at least one diene elastomeric polymer (A),
at least 0.1 phr of at least one reinforcing filler (B),
at least 0.1 phr of at least one polytetrazole cross-linking agent (C) of formula (I)

OG Complex Work Unit Chemistry
wherein
A is an organic group covalently bound to n tetrazoles,
n is an integer from 2 to 10;
each of the n tetrazoles is bound to A in position 2 or 5 and is respectively substituted in position 5 or 2 with a R group selected, independently for each tetrazole, from: C3-C10 linear or branched alkyl, C6-C20 aryl, C3-C10 cycloalkyl, monocyclic or bicyclic heterocyclyl, saturated, unsaturated or aromatic, with 5- or 6-member rings comprising at least one heteroatom selected from N, S, and O, optionally benzocondensed, being R in turn possibly substituted with at least one electron withdrawing group X or one electron donor group Y,
the polytetrazole cross-linking agent (C) having a molecular weight lower than 10000 g/mol, and
from 0 to 20 phr of a vulcanising agent (D).