Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1985-07-18
1986-09-16
Seccuro, Carman J.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264171, 264211, 264349, 525 74, 525 78, 525177, 525184, 525193, 525196, 525197, 525194, 525207, 525221, 525222, 525239, 525240, C08L 5106, C08L 2326
Patent
active
046121552
ABSTRACT:
A continuous process for the grafting of ethylenically unsaturated monomers onto homopolymers of ethylene and copolymers of ethylene and C.sub.4 -C.sub.10 higher alpha-olefins is disclosed. The process involves feeding to an extruder an admixture comprising (i) a major portion of the above polymer of ethylene, (ii) the monomer, (iii) 25-500 ppm of an organic peroxide and (iv) a minor portion of a normally solid thermoplastic polymer having a melting point of less than 185.degree. C. and a shear viscosity at 200.degree. C. and a shear rate of 400 sec.sup.-1 that is not more than 50% of that of the polymer of ethylene. The organic peroxide is in the form of a composition with the thermoplastic polymer. The admixture is mixed in a first zone at a temperature above the melting point of the polymers for at least ten seconds but for less than 25% decomposition of the peroxide and then in a second zone for a period that is at least four times the half-life of the peroxide. A grafted polymer having a melt index that is 20-100% of that of the polymer prior to grafting is obtained. The grafted polymer may be used in a variety of end-uses, for example, the manufacture of film, moulding of articles, extrusion coating of metals and coextrusion processes.
REFERENCES:
patent: 3868433 (1975-02-01), Bartz et al.
patent: 3966672 (1976-06-01), Gaylord
patent: 4234656 (1980-11-01), Amenbal et al.
Wong Chun S.
Zelonka Ronald A.
Du Pont Canada Inc.
Seccuro Carman J.
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