Aqueous dispersions of crystalline polymers and uses

摘要

Aqueous dispersions of crystalline polymers based on hydrophobic monomers, preferably on a mixture of hydrophobic and hydrophilic monomers which contains a crosslinking monomer, particularly side chain crystalline (SCC) polymers. The dispersions are useful for providing coatings on substrates, particularly on seeds (whose dormancy is thus extended) and on fibrous substrates, particularly human hair (which thus becomes heat-settable).

主权项

1. A coating composition which comprises water, a surfactant, and, dispersed in the water solid particles having an average particle size of less than 0.5 micron and comprising a crystalline polymer which
(1) has a melting point Tm and an onset-of-melting temperature, To, such that Tm-To is less than 20° C., (2) is derived from a monomer component comprising
(a) a hydrophobic monomer component comprising
(i) a first hydrophobic monomer which is such that a homopolymer thereof is a side chain crystalline (SCC) polymer having a melting point Tc, and(ii) a second hydrophobic monomer which is such that a homopolymer thereof is amorphous and has a glass transition point Tg which is less than Tc, and is from −50 to 120° C., and(b) a hydrophilic monomer component comprising a hydrophilic monomer,one or both of the hydrophobic monomer component and the hydrophilic monomer component containing at least one cross-linking monomer having at least two polymerizable groups.