Encapsulation of active ingredients

Microspheres having a particle size of 50 nm to 1 nm and a polydispersity of less than 40%, consisting of a chemically cross-linked starch shell containing an active ingredient, are obtained by preparing an oil-in-water emulsion of the active ingredient in a hydrophobic phase and starch or a dispersion of a solid active ingredient and starch in water, incorporating the oil-in-water emulsion or solid dispersion in an outer hydrophobic phase, particles of the oil-in-water emulsion or solid dispersion being formed in the outer hydrophobic phase, cross-linking the starch or derivative thereof and removing the outer hydrophobic phase if desired

Encapsulation of active ingredients

Microspheres having a particle size of 50 nm to 1 nm and a polydispersity of less than 40%, consisting of a chemically cross-linked starch shell containing an active ingredient, are obtained by preparing an oil-in-water emulsion of the active ingredient in a hydrophobic phase and starch or a dispersion of a solid active ingredient and starch in water, incorporating the oil-in-water emulsion or solid dispersion in an outer hydrophobic phase, particles of the oil-in-water emulsion or solid dispersion being formed in the outer hydrophobic phase, cross-linking the starch or derivative thereof and removing the outer hydrophobic phase if desired

Absorbing material based on starch having improved absorbent properties and process for the preparation thereof

A biodegradable, highly water-absorbing polymer based on starch or derivatives thereof is described, wherein the starch has not been chemically modified or only to a degree of substitution below 0.2, and has a water-absorbing power of at least 10 times its own weight, half of the water absorption being attained within 3 minutes. A process for producing such a water-absorbing polymer is also described, the process comprising modifying and treating the starch in a co-continuous water-oil or oil-water system in such a way that an open, slightly crosslinked structure is fixated

Method for the preparation of starch particles

A method for the preparation of starch particles in a two-phase system comprises at least the following steps: a) a preparation of a first phase comprising a dispersion of starch in water; b) preparation of a dispersion or emulsion of the first phase in a second liquid phase, with the proviso that the second phase is not water; c) cross-linking of the starch present in the first phase; d) separating the starch particles thus formed. According to a first aspect of the invention the second phase consists of a hydrophobic liquid and step b) consists in forming an oil-in-water emulsion, which is then inverted to a water-in-oil emulsion. According to a second aspect of the invention, the second phase consists of a water-miscible non-solvent for starch. Starch particles of very small particles size can be produced in a controlled manner by means of this method

Immobilization of active substances

The invention relates to a method for immobilizing an active substance, wherein a mixture is prepared of the active substance and a carrier material in a liquid phase, whereafter the liquid phase is converted to a solid phase, the carrier material being an esterified polysaccharide. The invention further relates to the use of an esterified polysaccharide for fixing or immobilizing active substances, in particular odorous substances

Immobilization of active substances

The invention relates to a method for immobilizing an active substance, wherein a mixture is prepared of the active substance and a carrier material in a liquid phase, whereafter the liquid phase is converted to a solid phase, the carrier material being an esterified polysaccharide. The invention further relates to the use of an esterified polysaccharide for fixing or immobilizing active substances, in particular odorous substances

Preparation of poly(2,6-dimethyl-1,4-phenylene ether) (PPE) and polyamide-6 blends via activated anionic polymerization of PPE and ε-caprolactam solutions

Activated anionic polymn. of homogeneous PPE/e-caprolactam solns. below the m.p. of polyamide-6 (PA-6) in the presence of a catalyst results in the prepn. of PPE/PA-6 blends. The morphol. of these blends consists of a continuous PPE and dispersed PA-6 phase or vice versa, depending on the PPE concn. The particle size of the dispersed PA-6 phase in the continuous PPE matrix is detd. by the viscosit