Low softening point homopolypropylene wax
AssigneeEastman Chemical Company
InventorsVernon K. Park, Randal R. Ford, Robert P. Allen
Life of this patent
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Abstract
A low molecular weight crystalline homopolypropylene wax of low softening point is disclosed. This homopolypropylene wax is prepared from high molecular weight crystalline polypropylene by thermal degradation in the presence of a relatively high amount of peroxide.
Claims20
A composition comprising a low molecular weight crystalline homopolypropylene wax having a number average molecular weight below 10,000, a ring and ball softening point below about 155.degree. C., a comonomer content of less than 1 mole percent and a melt viscosity of at least 30 cP at 190.degree. C. wherein said low molecular weight crystalline homopolypropylene wax is produced from a high molecular weight crystalline polypropylene homopolymer containing less than one percent comonomer having a number average molecular weight from 20,000 to 500,000 and a flow rate of 0.1 to 800.
A process for producing a crystalline homopolypropylene wax having a number average molecular weight below 10,000 and a ring and ball softening point below 155.degree. C. comprising degrading in the presence of about 1 to 15 weight percent peroxide, a crystalline polypropylene homopolymer having less than one mole percent comonomer and a number average molecular weight from 20,000 to 50,000 at a temperature of about 190.degree.-250.degree. C.
Dependencies are inferred from the claim text.