Polyurea or polyurea-urethane adhesive for bonding elastomers

As a polyurea adhesive composition formed by mixing two parts (A and B) together in predetermined relative amounts, Part A and Part B comprising, respectively:

• Part A--a mixture of
• a) a synthetic polymer of di-p-aminobenzoate containing a poly(tetramethyleneglycol) (PTMEG) backbone, and
• b) optionally an aromatic diamine selected from the group consisting of the aromatic diamines used as a chain extender which include but are not limited to methylene dianiline (MDA);
• 4,4'-methylene-bis-3-(chloro-2,6-diethylbenzenamine) (MCDEA);
• diethyltoluenedeamine (DETDA);
• 4,4'-methylene-bis-(2-ethyl-6-methylaniline) (MMEA);
• 4,4'-bis-(2,6-diethylaniline) (MDEA);
• 4,4'-methylene-bis-(2-isopropyl-6-methylaniline) (MMIPA);
• 4,4'-methylene-bis-(2-ethyl-6-methylcyclohexylamine) (M-MECA);
• 4,4'-bis(sec-butylamino), diphenylmethane;
• phenylenediamine;
• methylene-bis-orthochloroaniline (MBOCA);
• 4,4'-methylene-bis-(2-methylaniline) (MMA);
• 4,4'-methylene-bis-(2-chloro-6-ethylaniline) (MCEA);
• 4,4'-methylene-bis-(2,6-diethyl cyclohexylamine) (MDECA);
• 1,2-bis(2-aminophenylthio) ethane;
• N,N'-di-alkyl-p-phenylenediamine;
• 4,4'-bis(paraaminocyclohexyl) methane;
• 4,4'-methylene-bis(2,6-diisopropylaniline) (MDIPA);
• and dimethylthiotoluenediamine (DMTDA).
• Part B--an isocyanate terminated polyurea prepolymer formed by mixing
• a) a synthetic polymer of di-p-aminobenzoate containing a poly(tetramethyleneglycol (PTMEG) backbone with
• b) a diisocyanate selected from the group consisting of 4,4'methylene diisocyanate (MDI);
• 2,4'-methylene diisocyanate;
• polymeric MDI;
• toluene diisocyanates;
• p- and m-phenylene diisocyanates;
• tetramethylene diisocyanate;
• 1,6-hexamethylene diisocyanate;
• 1,4-cyclohexylene diisocyanate;
• 4,4'-methylene dicyclohexyl diisocyanate;
• 4,4'-diphenylmethane diisocyanate;
• 1,5-naphthalene diisocyanate;
• carbodimide modified methylene diisocyanate;
• 1,5-tetrahydronapthalene diisocyanate;
• and mixtures of these.