Hydrogels coated with steric or electrostatic spacers

Details Hydrogels coated with steric or electrostatic spacers Hydrogels coated with steric or electrostatic spacers

A - Human Necessities

61

L

A61L 15/60 (2006.01) A61L 15/18 (2006.01)

Patent

CA 2433044

The invention relates to non-water soluble hydrogels which can swell in water, and which are coated with steric or electrostatic spacers. Before being coated, the hydrogels comprise the following characteristics: absorbency under load (AUL) (0.7 psi) of at least 20 g/g, and gel strength of at least 1600 Pa. The coated hydrogels preferably have the following characteristics: centrifuge retention capacity (CRC) of at least 24 g/g, saline flow conductivity (SFC) of at least 30 x 10-7 cm3 s/g, and free swell rate (FSR) of at least 0.15 g/g s and/or a maximum vortex time of 160 s.

L'invention concerne des hydrogels non hydrosolubles, gonflant dans l'eau, revêtus de séparateurs stériques ou électrostatiques. Avant d'être revêtus, ces hydrogels présentent les caractéristiques suivantes: absorption sous pression (0,7 psi) d'au moins 20 g/g, module d'élasticité du gel d'au moins 1600 Pa. Les hydrogels revêtus présentent de préférence les caractéristiques suivantes : capacité de rétention après centrifugation d'au moins 14 g/g, perméabilité aux flux salins d'au moins 30 x 10?-7¿ cm?3¿ s/g et taux de gonflement libre d'au moins 0,15 g/g s et/ou durée maximale de vortex de 160 s.

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