Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1988-02-22
1989-08-15
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264236, 264347, 264349, 525193, B29C 4736
Patent
active
048572543
ABSTRACT:
A method for the grafting of at least two different monomers onto molten hydrocarbon polymer, in which the monomers are capable of undergoing thermally induced copolymerization, is disclosed. The method involves contacting one of said monomers with the other of said monomers in the presence of molten polymer and under admixing conditions such that the monomers and polymer are rapidly admixed. In preferred embodiments, the process is operated in the absence of initiator for the grafting reaction and in the substantial absence of antioxidant in the polymer. Preferably, one of the grafting monomers is selected from the group consisting of styrene, 2-methyl styrene, 4-methyl styrene, alpha-methyl styrene, beta-methyl styrene, 4-vinyl anisole, stilbene and indene, and mixtures thereof, and the other of the grafting monomers is selected from the group consisting of maleic anhydride, itaconic anhdride, citraconic anhydride, maleimide and N-phenylmaleimide, and mixtures thereof. In emobodiments, the polymer is a homopolymer of ethylene, propylene or 4-methyl pentene-1, or a copolymer of ethylene and/or propylene with at least one of butene-1, hexene-1, 4-methyl pentene-1 and octene-1. The grafted polymers may be used in coatings, adhesives or the like, or in the form of film, moulded articles or the like.
REFERENCES:
patent: 3511896 (1970-05-01), Harmer
patent: 3862265 (1975-01-01), Steinkamp et al.
patent: 3966845 (1976-06-01), Van Brederode et al.
patent: 4612155 (1986-09-01), Wong et al.
Polymer Letters, vol. 10, pp. 95-100 (1972) "Alternating Copolymer Graft Copolymers v. `Carboxylation` of Polymers by in situ Spontaneous Bulk Polymerization of Styrene-Maleic Anhydride Complex".
Du Pont Canada Inc.
Thurlow Jeffery
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