Process for the preparation of low branch content polybutadiene

Details Process for the preparation of low branch content polybutadiene Process for the preparation of low branch content polybutadiene

2006-09-26

2006-09-26

Teskin, Fred (Department: 1713)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S232000, C525S237000, C525S269000, C525S285000, C525S286000, C525S302000, C525S333200, C526S164000, C526S340400, C524S572000

Reexamination Certificate

active

07112632

ABSTRACT:
A process for the preparation of low branch content polybutadiene comprising:(a) a first butadiene polymerisation stage;(b) treatment of the polymer solution obtained upon completion of stage (a) with a coupling agent selected from:(i) polyunsaturated natural oils;(ii) butadiene and/or isoprene oligomers;(iii) butadiene and/or isoprene co-polymers with vinylarene monomers;the unsaturations present in compounds (i)–(iii) being at least partially substituted with groups selected from epoxides, anhydrides and esters;(c) recovery of the low branch content polybutadiene obtained upon completion of stage (b).

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R. P. Quirk, et al., “Butadiene polymerization using neodymium versatate-based catalysts: catalyst optimization and effects of water and excess versatic acid”, Polymer, Elsevier Science Publishers B.V, GB, vol. 41, No. 15, Jul. 2000, pp. 5903-5908.

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