Synthetic branched polyisoprenes and process for obtaining them

Details Synthetic branched polyisoprenes and process for obtaining them Synthetic branched polyisoprenes and process for obtaining them

2008-01-15

2008-01-15

Harlan, Robert D. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S337000, C524S127000, C524S140000

Reexamination Certificate

active

07319126

ABSTRACT:
Branched synthetic polyisoprenes are described having a macrostructure and a microstructure very similar to those of natural rubber. According to one aspect, these polyisoprenes have an apparent stress F/S0greater than or equal to 0.4 MPa at a relative elongation α of 150%, applied to a dumbbell-shaped test specimen consisting of the crosslinkable polyisoprene. According to another aspect, these polyisoprenes fulfill the relationship:in-line-formulae description="In-line Formulae" end="lead"?Cotan δ≧0.3761. ηinh+0.15,:  (i)in-line-formulae description="In-line Formulae" end="tail"?where cotan δ is the cotangent of the loss angle of a sample of said polyisoprene, measured at 130° C. by means of an instrument known by the trade name “RPA2000”, said sample being subjected to shear stress to 10% deformation and at a stress frequency of 0.035 Hz, and where ηinhis the inherent viscosity of said polyisoprene, measured in toluene at 25° C. and at a concentration of said polyisoprene in toluene of 0.1 g/dl.

REFERENCES:
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patent: 5064910 (1991-11-01), Hattori et al.
patent: 1 026 181 (2000-08-01), None
patent: WO 02/38635 (2002-05-01), None

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