Lubricant composition for internal combustion engine oil

Patent metadata

Field	Value
Publication number	US-9447358-B2
Application number	US-201314385572-A
Country	US
Kind code	B2
Filing date	Mar 19, 2013
Priority date	Mar 21, 2012
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

The present disclosure relates to a lubricating oil composition containing a base oil, a thioheterocyclic compound represented by the formula:

(R 1 ) k —(S) m —As—(S) n —(R 2 ) l ,

and an aminoalcohol compound containing, in the molecule thereof, a piperazine moiety and one or more hydroxyl groups. The lubricating oil composition has a phosphorus content (P mass %) and a sulfated ash content (M mass %), based on a total mass of the lubricating oil composition, satisfying any of the following conditions A to C:
condition A: P<0.03, and M<0.3; condition B: P<0.03, and 0.3≦M≦0.6; and condition C: 0.03≦P≦0.06, and M<0.3.

First claim

The invention claimed is:

1. A lubricating oil composition for internal combustion engines, the lubricating oil composition comprising:
a base oil;
a thioheterocyclic compound represented by the following formula (I):
(R 1 ) k —(S) m -A S -(S) n —(R 2 ) l   (I); and

an aminoalcohol compound comprising, in the molecule thereof, a piperazine moiety and one or more hydroxyl groups,
wherein:
As represents a thioheterocycle;
each of R 1 and R 2 represents a hydrogen atom, an amino group, a C1 to C50 hydrocarbyl group selected from among an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, and an aryl group, or, in the case of a hydrocarbyl group, a C1 to C50 heteroatom-containing group having an atom selected from among an oxygen atom, a nitrogen atom, and a sulfur atom, in the hydrocarbyl group; and
each of k, l, m, and n is an integer of 0 to 5;
the lubricating oil composition has a phosphorus content (P mass %) and a sulfated ash content (M mass %), based on a total mass of the lubricating oil composition, satisfying any of the following conditions A to C:
condition A: P<0.03, and M<0.3;
condition B: P<0.03, and 0.3≦M≦0.6; and
condition C: 0.03≦P≦0.06, and M<0.3.

2. The lubricating oil composition of claim 1 , wherein the aminoalcohol compound is a reaction product prepared by reacting a compound having an epoxy group with a piperazine-containing compound having at least one of a primary amino group and a secondary amino group.

3. The lubricating oil composition of claim 1 , wherein:
the aminoalcohol compound comprises a compound represented by the following formula (II):

each of R 3 , R 4 , and R 5 represents a hydrogen atom, an amino group, or a C2 to C38 hydrocarbyl group selected from among an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, and an aryl group.

4. The lubricating oil composition of claim 1 , wherein the aminoalcohol compound is a boronated aminoalcohol derivative.

5. The lubricating oil composition of claim 1 , wherein the case where both m and n are 0 is excluded.

6. The lubricating oil composition of claim 1 , wherein the thioheterocycle is a thiadiazole ring.

7. The lubricating oil composition of claim 6 , wherein the thiadiazole ring is a 1,3,4-thiadiazole ring to which a sulfur atom is bonded to the 2-position and the 5-position of the ring.

8. The lubricating oil composition of claim 6 , wherein one sulfur atom is bonded to the 2-position or the 5-position of the 1,3,4-thiadiazole ring.

Assignees

• Idemitsu Kosan Co

Inventors

• Shimizu Yasunori
• Iwasaki Junya

Classifications

• C10N2040/25

  Internal-combustion engines · CPC title

• C10M2223/045

  Metal containing thio derivatives · CPC title

• C10M2215/221

  Six-membered rings containing nitrogen and carbon only · CPC title

• C10M2229/02

  Unspecified siloxanes; Silicones · CPC title

• C10N2030/45

  Ash-less or low ash content · CPC title