Grafting of monomers onto polyolefins in presence of organic peroxides
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United States of America Patent
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Dec 18, 2001
Grant Date -
N/A
app pub date -
Apr 28, 1994
filing date -
Apr 27, 1993
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Abstract
A method for the grafting of a monomer onto a polyolefin in the presence of an organic peroxide is disclosed. The polyolefin is a polyolefin that, when molten, undergoes cross-linking in the presence of the organic peroxide. The method comprises: (a) admixing the polyolefin in an extruder with 25 to 6000 ppm, based on the weight of the polyolefin, of an organic peroxide coated onto a carrier polymer and up to 5%, by weight of the polyolefin, of a grafting monomer capable of being grafted onto the polyolefin in the presence of the organic peroxide. The admixture is heated to a temperature above the melting point of both the polyolefin and the carrier polymer under admixing conditions to effect grafting of said grafting monomer onto the polyolefin, said carrier polymer undergoing chain scission in preference to cross-linking in the presence of the organic peroxide at said temperature. Grafted polyolefin is extruded from the extruder. The method may be used to produce grafted polyolefins with lower levels of gels and specks, especially for use in films and adhesives.
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