Nitrogen-containing esterified carboxy-containing...

C - Chemistry – Metallurgy – 10 – M

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C10M 149/14 (2006.01) C08F 8/32 (2006.01) C10M 149/06 (2006.01) C10M 149/10 (2006.01)

Patent

CA 2379204

A nitrogen-containing ester derived from a carboxy-containing interpolymer having a reduced specific viscosity (RSV) of from about 0.05 to about 2, said interpolymer being derived from at least two monomers, (i) one of said monomers being at least one of an aliphatic olefin containing from 2 to about 30 carbon atoms and a vinyl aromatic monomer and (ii) the other of said monomers being at least one alpha, beta-unsaturated acylating agent, said ester being characterized by the presence within its polymeric structure of each of the following groups which are derived from the carboxy groups of said interpolymer: (A) from about 20 to about 70 mole % based on moles of carboxyl groups in said interpolymer, of ester groups containing from about 13 to about 19 carbon atoms; (B) from about 80 to about 30 mole %, based on moles of carboxyl groups in said interpolymer, of ester groups containing from about 8 to about 12 carbon atoms, optionally; (C) up to about 20 mole %, based on moles of carboxyl groups in said interpolymer, of ester groups containing from 2 to 7 carbon atoms; wherein from about 93 to about 97% of the carboxy groups derived from the carboxy-containing interpolymer are ester groups, the balance of the carboxy groups comprising residual carboxylic acid or anhydride groups which are then (D) reacted with at least one amino compound having an average of from 1 to about 1.1 primary or secondary amino groups, to convert from about 5 up to less than 50 % of the carboxylic acid or anhydride groups to carbonyl-amino groups, with the unreacted carboxylic acid or anhydride groups remaining as (E) residual carboxylic acid or anhydride groups. Additive concentrates and lubricating oil compositions are also disclosed.

La présente invention concerne un ester azoté d'interpolymère carboxy possédant une viscosité spécifique réduite (RSV) comprise entre environ 0,05 et environ 2, cet interpolymère étant dérivé d'au moins deux monomères, (i) l'un des monomères étant constitué au moins d'une oléfine aliphatique contenant de 2 à 30 atomes de carbone et d'un monomère vinylique aromatique et (ii) l'autre monomère étant au moins un agent d'acylation alpha, bêta insaturé, ledit ester étant caractérisé par la présence dans sa structure polymérique de chacun des groupes qui suivent, dérivés des groupes carboxy de l'interpolymère: (A) à partir d'environ 20 jusqu'à environ 70 mole % en moles de groupes carboxy, de groupes esters contenant environ de 13 à 19 atomes de carbone, (B) à partir d'environ 80 à environ 30 mole % en moles de groupes carboxy de l'interpolymère, de groupes esters contenant environ de 8 à 12 atomes de carbone, éventuellement, (C) jusqu'à environ 20 mole % en mole de groupes carboxy de l'interpolymère, de groupes esters contenant de 2 à 7 atomes de carbone, dans lequel interpolymère à partir d'environ 93 jusqu'à environ 97 % des groupes carboxy dérivés sont des groupes ester, le solde des groupes carboxy comprenant des groupes acide carboxylique ou anhydride résiduels est alors (D) réagi avec au moins un composé amino possédant une moyenne d'environ 1 à environ 1,1 groupes amino primaire ou secondaire, afin de transformer environ de 5 à moins de 50 % des groupes acide carboxylique ou anhydride en groupes carbonyl-amino, les groupes acide carboxylique et anhydride n'ayant pas réagi restant comme (E) des groupes résiduels. L'invention concerne aussi des concentrés d'addition et des compositions d'huile lubrifiante.

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