Synthetic branched polyisoprenes and method of obtaining same

C - Chemistry – Metallurgy – 08 – F

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C08F 136/08 (2006.01) C08C 19/00 (2006.01)

Patent

CA 2503200

The invention relates to synthetic branched polyisoprenes having a macrostructure and a microstructure which are very similar to those of natural rubber. According to one aspect of the invention, said polyisoprenes have an apparent stress F/S¿0?which is equal to or greater than 0.4 MPa for an elongation .alpha. of 150 % which is applied to a dumb-bell-shaped test piece containing cross-linkable polyisoprene. According to another aspect of the invention, said polyisoprenes satisfy relation (i) Cotan .delta. = 0.3761. .eta.¿inh? + 0.15, wherein: cotan .delta. is the cotangent of the loss angle of a sample of the polyisoprene, which is measured at 130· C using a device with the trade name RPA2000, said sample being shear stressed at 10 % of deformation and at a stress frequency of 0.035 Hz; and .eta.¿inh? is the inherent viscosity of the polyisoprene, which is measured in toluene at 25· C and with a 0.1 g/dl concentration of polyisoprene in the toluene.

L'invention concerne des polyisoprènes ramifiés de synthèse présentant une macrostructure et une microstructure très proches de celles du caoutchouc naturel. Selon un aspect de l'invention, ces polyisoprènes présentent une contrainte apparente F/S0 égale ou supérieure à 0,4 MPa pour un allongement relatif .alpha. de 150 %, appliqué à une éprouvette en forme d'haltère constituée du polyisoprène réticulable. Selon un autre aspect de l'invention, ces polyisoprènes satisfont à la relation (i) : Cotan .delta. >= 0,3761. .eta.inh + 0,15, où cotan .delta. est la cotangente de l'angle de pertes d'un échantillon dudit polyisoprène, mesurée à 130~ C au moyen d'un appareil de dénomination commerciale «RPA2000 », ledit échantillon étant sollicité en cisaillement à 10 % de déformation et à une fréquence de sollicitations de 0,035 Hz, et où .eta.inh est la viscosité inhérente dudit polyisoprène, mesurée dans le toluène à 25~ C et à une concentration dudit polyisoprène dans le toluène de 0,1 g/dl.

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