Hydrocarbyl substituted carboxylic compositions and derivatives thereof useful as dispersant/viscosity improvers for lubricating oil and fuel compositions. Carboxylic compositions are derived from (A) a hydrocarbon polymer having M.sub.n ranging from about 20,000 to about 500,000, and (B) an .alpha.,.beta.-unsaturated carboxylic compound prepared by reacting (1) an active methylene compound of the formula (I), and (2) a carbonyl compound of the general formula (II), wherein R.sup.a is H or hydrocarbyl and R.sup.b is a member of the group consisting of H, hydrocarbyl and (III), wherein each R' is independently R or OR and each R is, independently, H or a hydrocarbyl group; and lower alkyl acetals, ketals, hemiacetals and hemiketals of the carbonyl compound (2). Carboxylic derivative compositions are obtained by reacting the carboxylic compositions with a reactant selected from the group consisting of (a) amines characterized by the presence within their structure of at least one condensable H--N< group, (b) alcohols, (c) reactive metal or reactive metal compounds, and (d) a combination of two or more of any of (a) through (c), the components of (d) being reacted with the carboxylic composition simultaneously or sequentially, in any order.

Composiciones substituidas Hydrocarbyl y derivados carboxylic de eso útiles como promotores de dispersant/viscosity para las composiciones del aceite lubricante y del combustible. Las composiciones carboxylic se derivan (a) de un polímero del hidrocarburo que tiene M.sub.n el extenderse de cerca de 20.000 a cerca de 500.000, y (b) de un alpha., compuesto carboxylic de.beta.-unsaturated preparado reaccionando (1) un compuesto activo del metileno del fórmula (i), y (2) un compuesto de carbonyl del fórmula general (ii), en donde R.sup.a es H o el hydrocarbyl y R.sup.b es un miembro del grupo que consiste en H, hydrocarbyl y (iii), en donde cada R ' está independientemente R u O y cada R es, independientemente, H o un grupo del hydrocarbyl; y acetales, ketals, hemiacetals y hemiketals alkyl más bajos del compuesto de carbonyl (2). Las composiciones derivadas carboxylic son obtenidas reaccionando las composiciones carboxylic con un reactivo seleccionado de las aminas que consisten en del grupo (a) caracterizadas por la presencia dentro de su estructura por lo menos de un H--N condensable