Compositions containing ground vulcanized rubber and high melt flow polymer
OwnerEdgar A Gonzalezinventor
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Abstract
Improved thermoplastic compositions comprising a blend of ground vulcanized rubber and an alpha olefin copolymer which have improved compatibility and properties are described; they are improved by incorporation of a high melt flow index polypropylene homopolymer.
Claims11
Improved thermoplastic compositions comprising a blend of about 10-90 parts by weight of ground vulcanized rubber in the form of small dispersed particles essentially of 1.5 mm number average or below, wherein said rubber is selected from the group consisting of natural rubber, synthetic polymer and copolymer rubber derived from alkadienes, and mixtures thereof, about 0.5-80 parts by weight of one or more metallocene catalyzed alpha olefin copolymer and about 90-10 parts by weight of high melt flow index homopolymer polypropylene polymer of 30 melt flow index (230° C./2.16 kg) or above.
A process for manufacturing improved thermoplastic compositions which comprises mixing a blend of about 10-90 parts by weight of ground vulcanized rubber in the form of small dispersed particles essentially of 1.5 mm number average or below, wherein said rubber is selected from the group consisting of natural rubber, synthetic polymer and copolymer rubber derived from alkadienes, and mixtures thereof, about 0.5-80 parts by weight of one or more metallocene catalyzed alpha olefin copolymer and about 90-10 parts by weight of high melt flow index homopolymer polypropylene polymer of 30 melt flow index (230° C./2.16 kg) or above at a temperature high enough to soften or melt the polymers, and for sufficient time to obtain a homogeneous mixture.
Dependencies are inferred from the claim text.