Surface modified particles by multi-step Michael-type addition and process for the preparation thereof

A method of producing a surface-modified aluminum oxyhydroxide particle comprising:

• (a) reacting an aluminum oxyhydroxide particle with a first reactive compound having an anchoring group and a first reactive group which is a first member of a Michael-type donor-acceptor pair, whereby the anchoring group reacts with the particle, producing a first surface-modified particle;
• and
• (b) reacting said first surface-modified particle with a second reactive compound which is not an alumoxane and does not contain an N-alkylacrylamidoglycosyl group, said second reactive compound having a second reactive group which is a second member of the Michael-type donor-acceptor pair by a Michael-type addition, producing a second surface-modified particle.

A method of producing a surface-modified particle comprising:

• (a) reacting a nonsilica-containing particle with a first organic reactive compound having an anchoring group and a first reactive group which is a first member of a Michael-type donor-acceptor pair, whereby the anchoring group reacts with the particle, producing a first surface-modified particle;
• and
• (b) reacting said first surface modified particle with a second reactive compound which is not an alumoxane and does not contain an N-alkylacrylamidoglycosyl group, said second reactive compound having a second reactive group which is a second member of the Michael-type donor-acceptor pair by a Michael-type addition, producing a second surface-modified particle.

A method of producing a surface-modified particle comprising:

• (a) reacting a particle that does not have a shell containing silica with a first organic reactive compound having an anchoring group and a first reactive group which is a first member of a Michael-type donor-acceptor pair, whereby the anchoring group reacts with the particle, producing a first surface-modified particle;
• and
• (b) reacting said first surface modified particle with a second reactive compound which is not an alumoxane and does not contain an N-alkylacrylamidoglycosyl group, said second reactive compound having a second reactive group which is a second member of the Michael-type donor-acceptor pair by a Michael-type addition, producing a second surface-modified particle.