Method for producing Mannich adducts that contain polyisobutylene phenol

A Mannich adduct obtained by

• a) alkylating a phenol with polyisobutene to form an alkylation product, wherein the polyisobutylene has more than 70 mol % of vinylidene double bonds and a number average molecular weight of from 300 to 3000 at below about 50° C. in the presence of an alkylation catalyst;
• b) reacting the alkylation product with at least one of formaldehyde, an oligomer of formaldehyde and a polymer of formaldehyde, and at least one amine having at least one secondary amino function and no primary amino function;
• wherein the amine has at least two secondary amino functions.

A Mannich adduct obtained by

• a) alkylating a phenol with polyisobutene to form an alkylation product, wherein the polyisobutylene has more than 70 mol % of vinylidene double bonds and a number average molecular weight of from 300 to 3000 at below about 50° C. in the presence of an alkylation catalyst;
• b) reacting the alkylation product with at least one of formaldehyde, an oligomer of formaldehyde and a polymer of formaldehyde, and at least one amine having at least one secondary amino function and no primary amino function;
• wherein the amine has at least one secondary amino function and at least one tertiary amino function.