Preparation of syndiotactic 1, 2-polybutadiene using a chromium-containing catalyst system
AssigneeBridgestone Corporation
InventorsSteven X. L. Luo, Yoichi F. Ozawa, James E. Hall, Jung W. Kang
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Abstract
The instant invention teaches a method for forming a syndiotactic 1,2-polybutadiene product having a syndiotacticity of more than 66.5% and a melting temperature of more than about 100° C. The method includes polymerizing 1,3-butadiene in solution with a solvent, in the presence of catalytically effective amounts of: (a) an organomagnesium compound; (b) a chromium compound; and, (c) a dihydrocarbyl hydrogen phosphite. The present invention also contemplates a product of the method and an article made from the product.
Claims12
A method for forming a syndIotactic 1,2-polybutadiene product, comprising:
- polymerizing 1,3-butadiene in a hydrocarbon solvent, in the presence of catalytically effective amounts of:
- (a) an organomagnesium compound;
- (b) a chromium compound;
- and,
- (c) a dihydrocarbyl hydrogen phosphite, wherein the chromium compound is soluble in the hydrocarbon solvent.
A method for forming a syndiotactic 1,2-polybutadiene product, comprising:
- polymerizing 1,3-butadiene in a hydrocarbon solvent, in the presence of catalytically effective amounts of:
- (a) an organomagnesium compound;
- (b) a chromium compound selected from the group consisting of:
- chromium 2-ethylhexanoate, chromium neodecanoate, chromium naphthenate, chromium stearate, chromium oleate, chromium benzoate, chromium tris(acetylacetonate), chromium tris(trifluoroacetylacetonate), chromium tris(hexafluoroacetylacetonate), chromium tris(benzoylacetonate), chromium tris(2,2,6,6-tetramethyl-3,5-heptanedionate), chromium ethoxide, chromium isopropoxide, chromium 2-ethylhexoxide, chromium phenoxide, chromium nonylphenoxide, chromium naphthoxide, tris(allyl)chromium, tris(methally)chromium, tris(crotyl)chromium, bis(cyclopentadienyl)chromium, bis(pentamethylcyclopentadienyl)chromium, bis(benzene)chromium, bis(ethylbenzene)chromium, and bis(mesitylene)chromium;
- and,
- (c) a dihydrocarbyl hydrogen phosphite.
Dependencies are inferred from the claim text.