US 12,187,975 B2
Use of a lubricating grease composition having a high upper use temperature
Christof Schmitz, Munich (DE); Wolfgang Tiepermann, Weilheim (DE); Raphaela Makrutzki, Dietramszell-Ascholding (DE); and Stefan Seemeyer, Wolfratshausen (DE)
Assigned to KLUEBER LUBRICATION MUENCHEN GMBH & CO. KG, Munich (DE)
Filed by Klueber Lubrication Muenchen SE & CO. KG, Munich (DE)
Filed on Jul. 26, 2023, as Appl. No. 18/358,987.
Application 18/358,987 is a division of application No. 17/783,655, abandoned, previously published as PCT/EP2020/080748, filed on Nov. 3, 2020.
Claims priority of application No. 10 2019 134 330.5 (DE), filed on Dec. 13, 2019.
Prior Publication US 2023/0365884 A1, Nov. 16, 2023
Int. Cl. C10M 169/02 (2006.01); C10M 107/02 (2006.01); C10M 117/08 (2006.01); C10M 119/24 (2006.01); C10M 123/04 (2006.01); C10N 40/06 (2006.01); C10N 50/10 (2006.01)
CPC C10M 169/02 (2013.01) [C10M 107/02 (2013.01); C10M 117/08 (2013.01); C10M 119/24 (2013.01); C10M 123/04 (2013.01); C10M 2205/0206 (2013.01); C10M 2207/284 (2013.01); C10M 2217/0456 (2013.01); C10N 2040/06 (2013.01); C10N 2050/10 (2013.01)] 10 Claims
 
1. A method of lubricating surfaces of plastic-containing friction partners, the method comprising:
providing a lubricant grease composition having an upper use temperature of at least 90° C., the lubricant grease composition comprising:
a base oil, wherein the base oil comprises one or more of polyalphaolefins, metallocene polyalphaolefins, and naphthenic mineral oils according to the API GroupI classification; and
a thickener comprising an aluminum-based complex soap and a polyurea thickener; and
lubricating the surfaces of plastic-containing friction partners or of a combination of metallic and plastic-containing friction partners;
wherein the polyurea thickener is a reaction product of a diisocyanate selected from the group consisting of 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, 4,4′-diisocyanatodiphenylmethane, 2,4′-diisocyanatophenyl-methane, 4,4′-diisocyanatodiphenyl, 4,4′-diisocyanato-3,3′-dimethylphenyl, 4,4′-diisocyanto-3,3′-dimethyl-phenylmethane, which may be used individually or in combination, with an amine of the general formula R′2-N—R, or a diamine of the general formula R′2-N—R—NR′2 where R is an aryl, alkyl or alkylene radical having 2 to 22 carbon atoms and R′ is identical or different and is a hydrogen or an alkyl, alkylene or aryl radical, or with mixtures of amines and diamines;
wherein the aluminum-based complex soap has the formula (A)

OG Complex Work Unit Chemistry
where R is an aliphatic hydrocarbyl radical having 4 to 28 carbon atoms;
wherein R is derived from one or more fatty acids selected from the group consisting of lauric acid, palmitic acid, myristic acid, and stearic acid;
wherein the base oil has a kinematic viscosity of 18 mm2/s to 20,000 mm2/s at 40° C.
wherein a proportion of the polyurea thickener in the lubricant grease composition is 1% by weight to 11% by weight based on the total weight of the lubricant grease composition; and
wherein a proportion of the aluminum-based complex soap in the lubricant grease composition is from 1% by weight to 11% by weight based on the total weight of the lubricant grease composition.