Meleic anhydride graft copolymers having low yellowness index an

Details Meleic anhydride graft copolymers having low yellowness index an Meleic anhydride graft copolymers having low yellowness index an

1990-03-06

1990-10-30

Buffalow, Edith

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Physical dimension specified

428500, 428516, 428520, 428522, B32B 2700

Patent

active

049668102

ABSTRACT:
Maleic anhydride can be satisfactorily grafted to polymers at low pressures by feeding the polymer through a multiple screw extruder and injecting the maleic anhydride and a free radical initiator into the extruder. The maleic anhydride and initiator can be pre-mixed in a solvent solution. The solvent and unreacted maleic anhydride can be removed by low pressure devolatilization. The graft copolymer has a yellowness index as measured by ASTM D-1925-70 less than about 10.0 and as measured by ASTM E-313-73 less than about 11.0. Further, between 0.75 and 2.0 weight percent of the graft copolymer comprises maleic anhydride. The graft copolymer can further be blended with an olefinic polymer to yield adhesive thermoplastics suitable for use as food packaging multilayer coextruded films.

REFERENCES:
patent: 3868433 (1975-02-01), Bartz et al.
patent: 4327009 (1982-04-01), Allen
patent: 4506056 (1985-03-01), Gaylor

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