US 12,281,227 B2
Rubber composition with enhanced curing and adhesion properties, process for its preparation, and engineered rubber products made therefrom
Ümit Özkütükcü, Heilbronn (DE); Anne Schulz, Flein (DE); Stefan Mark, Bad Rappenau (DE); and Ralph Schäfer, Wiesbaden (DE)
Assigned to L. Brüggemann GmbH & Co. KG, Heilbronn (DE); and Allnex Germany GmbH, Wiesbaden (DE)
Appl. No. 17/283,822
Filed by L. Brüggemann GmbH & Co. KG, Heilbronn (DE)
PCT Filed Dec. 9, 2019, PCT No. PCT/EP2019/084295
§ 371(c)(1), (2) Date Apr. 8, 2021,
PCT Pub. No. WO2020/074751, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 18199042.5 (EP), filed on Sep. 12, 2019.
Prior Publication US 2021/0388184 A1, Dec. 16, 2021
Int. Cl. C08L 7/00 (2006.01); C08J 3/22 (2006.01)
CPC C08L 7/00 (2013.01) [C08J 3/226 (2013.01); C08L 2205/03 (2013.01); C08L 2310/00 (2013.01); C08L 2312/00 (2013.01)] 10 Claims
 
1. A rubber composition with enhanced curing and adhesion properties, comprising the following ingredients:
R1 an elastomer or rubber E which is a diene-based elastomer selected from the group consisting of natural rubber NR, synthetic polyisoprene IR, butadiene rubber BR, and styrene-butadiene rubber SBR,
R2 a particulate active filler which comprises carbon black, silica, or a combination of both,
R3 a cobalt free curing or crosslinking or vulcanising system which includes sulphur, an active zinc composition ZnX having a specific surface area of from 10 m2/g to 100 m2/g, and accelerators, wherein the active zinc composition comprises at least one of oxides, hydroxides, carbonates and basic carbonates of zinc, and has an average composition according to the general formula ZnxOy(OH)z(CO3)v, wherein the indexes x, y, z, and v are integer and non-integer numbers in the following ranges: x=1 to 6, y=0 to 5, z=0 to 6, and v=0 to 5, with the requirement that more than one of y, z and v is greater than zero, and wherein the sum 2×x−2×y−z−2×v=0,
R4 a novolak composition NC which is a mixture of a novolak resin PA and a urethane-aldehyde resin UA′, and
R5 a methylene donor.