Polyfunctional amines with hydrophobic modification for controlled crosslinking of latex polymers
Polyfunctional amine structures exhibiting at least one hydrophobic moiety selected from the group consisting of; hydrophobic epoxides, hydrophobic glycidyl ethers and hydrophobic (meth)acrylates are described which provide crosslinking capabilities for latex polymer compositions. These crosslinkers not only exhibit latent crosslinking properties but also improved hydrophobicity when compared with existing latex formulations. Latent crosslinking provides advantages associated with fast interactions between the anionic latex charge and the cationic charge associated with these hydrophobically modified polyfunctional amine crosslinkers. Once the latex is coated onto a substrate, the volatile base evaporates and the groups react to form a crosslinked coating with both improved hydrophobic and wash-off properties.
1. A polyfunctional amine comprising recurring units derived from the reaction of one bi- or tri-glycidyl moiety and a single, di-, or tri-functional amino monomer(s), or combination of, mono/tri, mono/tetra, bi/bi, bi/tri, bi/tetra, tri/tri, tri/tetra, and tetra/tetra functional amino monomers resulting in one or more polyfunctional amines
wherein I-x-2-b′ is a hydrophobic crosslinking agent and comprises at least three pH responsive amino group sites configured to accept or release proton(s) in response to a change in pH, and comprises at least one NH and/or one —NH 2 site providing reactive sites for hydrophobic compounds that introduce at least one hydrophobic moiety into hydrophobic modifications of I-x-b-2′ structures represented by formulae I-x-b-2′ a, I-x-b-2′b, I-x-b-2′c and I-x-b-2′d:
wherein said structures of formulae I-x-b-2′a, I-x-b-2′b, I-x-b-2′c and I-x-b-2′d have at least one hydrophobic moiety introduced into said structures from the group consisting of: hydrophobic epoxides, hydrophobic glycidyl ethers and hydrophobic (meth)acrylates.
2. The polyfunctional amine of claim 1 , wherein said hydrophobic moiety is provided by post modification reactions with said epoxides, glycidyl ethers and (meth)acyrlates at ambient temperature and pressure.
3. A latex formulation comprising the polyfunctional amine of claim 1 .
4. The latex formulation of claim 3 , wherein said hydrophobic moiety is provided by carrying out post modification reactions with said epoxides, glycidyl ethers and (meth)acrylates at ambient temperature and pressure.