Abstract: A process is disclosed for preparing a thermoplastic composition having elastic memory and containing polyurethane interlocked in a network of polycaprolactone. The product of the aforementioned process is particularly useful as orthopedic cast or immobilizing device.

Abstract: The present invention relates to a new inert matrix having adjustable porosity and hardness.This matrix comprises polycaprolactone having an average molecular weight of between 2000 and 70,000, which is in the form of agglomerated grains having an average diameter of between 50 and 500 .mu.m and has a degree of crystallinity of at least 75%. The invention relates to the method for the preparation of a porous galenic form by means of the said matrix.

Abstract: The present invention relates to a process for preparing a polymer of the cross-linked polyurethane type, whereby(1) the following are reacted:(a) a polyolether, chosen from the group constituted by the oxyalkylene polyols (I) and mixtures thereof, obtained by condensation of a polyol (II) containing at least 2 OH groups and preferably 3 to 6 OH groups with an alkylene oxide (III) at a rate of 1 to 20 moles of (III) per free OH group of (II), and(b) a polyisocyanate (IV),the reaction being effected with an excess of OH groups of (I) with respect to the NCO isocyanate groups of (IV) to obtain a polyurethane-polyol (V) having free OH groups; and(2) the polyurethane-polyol (V) thus obtained is reacted with epichlorhydrin (VI) and a polyamine (VII) chosen from the polyamines having at least two NH.sub.2 amino groups and mixtures thereof. The invention also relates to this polymer as new industrial product and to its application as swelling agent.