Thermoplastic polymers

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/08 (2006.01) A63H 33/00 (2006.01) B44C 3/04 (2006.01) C08L 67/04 (2006.01) C08G 63/82 (2006.01)

Patent

CA 2241298

Products intended for use as hand mouldable materials should meet the objectives of not causing pain to the user when held in the hand, and retaining malleability for a sufficient but not excessive length of time. The invention hand-mouldable compositions comprise selected copolymers of lactones and lactides which manifest a melt temperature T m in the range of from 48 to 58°C and a crystallisation temperature T c in the range of from 16 to 30°C. They are preferably produced from .epsilon.caprolactone and L-lactide, most desirably in a weight ratio of from 94:6 to 91:9, and especially at a reaction temperature in the range of from 150 to 190°C. They are often coloured and can be employed in kits.

Les produits à mouler à la main doivent respecter les critères suivants : ils ne doivent pas faire mal aux mains lors de leur manipulation; ils doivent rester malléables assez longtemps, mais pas pendant une période excessivement longue. Les compositions moulables à la main de l'invention renferment des copolymères sélectionnés de lactones et de lactides, qui possèdent une température Tf de fusion de l'ordre de 48-58 degrés C et une température Tc de cristallisation de 16-30 degrés C. Elles sont préférablement produites à partir d'epsilon-caprolactone et de L-lactide, avec - c'est fortement souhaitable - un rapport pondéral de 94:6 à 91:9, et tout spécialement à une température de réaction de 150-190 degrés C. Ils sont souvent colorés et peuvent être employés dans des trousses.

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