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Antioxidant dispersant polymer dendrimer

  • US 4,938,885 A
  • Filed: 09/28/1989
  • Issued: 07/03/1990
  • Est. Priority Date: 09/28/1989
  • Status: Expired due to Fees
First Claim
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1. A lubricating composition comprising a major portion of a lubricating oil and a minor, effective dispersant, amount of a reaction product by a process comprising the following steps which can be repeated any desired number of times, said process comprising:

  • (a) reacting an amine or polyamine with an alkyl acrylate in the presence of an alkyl alcohol to produce a first generation polyamine ester dendrimer;

    (b) reacting said first generation polyamine ester dendrimer with an amine or a polyamine to produce a first generation polyamidoamine dendrimer;

    (c) reacting said first generation polyamidoamine dendrimer with an alkyl acrylate to produce a 12-branch second generation polyamidoamine ester dendrimer;

    (d) reacting said 12-branch second generation polyamidoamine ester dendrimer with an amine or polyamine to produce a 12-branch second generation polyamidoamine dendrimer; and

    (e) reacting said 12-branch second generation polyamidoamine dendrimer with a polyisobutenyl succinimide acid anhydride to produce the product lubricant, a 12-polyisobutenyl succinicimide-12-polyamidoamine dendrimer polymer.

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