The present invention relates to the use of amines and/or Mannich adducts as detergents and/or dispersants in fuel and lubricant compositions for direct-injection gasoline engines. The invention further relates to fuel and lubricant compositions which comprise at least one such Mannich adduct, and also a bisaminoalkylated Mannich adduct.

Polyisobutylenes (PIBs) containing a high proportion of vinylidene end groups are generally favored over conventional PIBs because of their higher reactivity in reactions that are needed to prepare fuel and lubricant additives. However, detergent additives that have been prepared from conventional PIBs actually perform better than detergent additives prepared from high reactive PIBs. Specifically, detergent additives that were prepared from conventional PIB that was then enriched with tri- and tetra-PIB resulted in altered thermal stability and improved detergency of the resulting compound as compared to the structures which were created using a high proportion of vinylidene end groups.

A PIB derivative suitable for use as a fuel additive or lubricant additive prepared from a reactive low molecular weight polyisobutylene composition comprising at least 50 mol percent alpha vinylidene terminated polyisobutylene molecules, the composition having a polydispersity of no more than 1.5 and a number average molecular weight of at least 500 Daltons and no more than 1000 Daltons. The derivative is selected from the group consisting of: alkyl hydroxyaromatic compounds; alkyl alkoxy aromatic compounds; polyisobutenylsuccinic anhydrides; polyisobutenylsuccinimides; PIB-amine compounds; sulfurized PIB compounds; and Mannich condensation products of an alkylated hydroxyaromatic compound.

A PIB derivative suitable for use as a fuel additive or lubricant additive prepared from a reactive low molecular weight polyisobutylene composition comprising at least 50 mol percent alpha vinylidene terminated polyisobutylene molecules, the composition having a polydispersity of no more than 1.5 and a number average molecular weight of at least 500 Daltons and no more than 1000 Daltons. The derivative is selected from the group consisting of: alkyl hydroxyaromatic compounds; alkyl alkoxy aromatic compounds; polyisobutenylsuccinic anhydrides; polyisobutenylsuccinimides; PIB-amine compounds; sulfurized PIB compounds; and Mannich condensation products of an alkylated hydroxyaromatic compound.

A PIB derivative suitable for use as a fuel additive or lubricant additive prepared from a reactive low molecular weight polyisobutylene composition comprising at least 50 mol percent alpha vinylidene terminated polyisobutylene molecules, the composition having a polydispersity of no more than 1.5 and a number average molecular weight of at least 500 Daltons and no more than 1000 Daltons. The derivative is selected from the group consisting of: alkyl hydroxyaromatic compounds; alkyl alkoxy aromatic compounds; polyisobutenylsuccinic anhydrides; polyisobutenylsuccinimides; PIB-amine compounds; sulfurized PIB compounds; and Mannich condensation products of an alkylated hydroxyaromatic compound.

This invention relates to a lubricating oil composition and production thereof. The lubricating oil composition comprises a Mannich base represented by the following formula (III) (wherein A and R.sub.2 are as defined in the specification) and a lubricant base oil. The lubricating oil composition according to this invention exhibits excellent cleansing and dispersing performance and excellent anticorrosion performance. ##STR00001##

This invention relates to a lubricating oil composition and production thereof. The lubricating oil composition comprises a Mannich base represented by the following formula (III) (wherein A and R.sub.2 are as defined in the specification) and a lubricant base oil. The lubricating oil composition according to this invention exhibits excellent cleansing and dispersing performance and excellent anticorrosion performance. ##STR00001##

This invention relates to a Mannich base, production and use thereof in producing a detergent. The Mannich base is represented by the following formula (III), wherein A and R.sub.2 are as defined in the specification. The Mannich base can be used to produce a detergent and a fuel oil composition exhibiting excellent deposit formation suppressing performance and excellent anticorrosion performance. ##STR00001##

This invention relates to a Mannich base, production and use thereof in producing a detergent. The Mannich base is represented by the following formula (III), wherein A and R.sub.2 are as defined in the specification. The Mannich base can be used to produce a detergent and a fuel oil composition exhibiting excellent deposit formation suppressing performance and excellent anticorrosion performance. ##STR00001##