Maleic anhydride graft copolymers having low yellowness index an

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

1988-08-05

1990-05-22

Briggs, Sr., Wilbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525257, 525539, C08F25502, C08F28300

Patent

active

049278886

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: 3177270 (1965-04-01), Jones et al.
patent: 3658948 (1972-02-01), McConnell
patent: 3776866 (1973-12-01), Nakayama
patent: 3868433 (1975-02-01), Bartz et al.
patent: 3882194 (1975-05-01), Krebaum et al.
patent: 4010223 (1977-03-01), Caywood, Jr.
patent: 4147740 (1979-03-01), Swiger
patent: 4506056 (1985-03-01), Gaylord
patent: 4639495 (1987-01-01), Waggoner
patent: 4684576 (1987-08-01), Tabor
patent: 4753997 (1988-06-01), Shyu et al.
patent: 4762890 (1988-08-01), Strait et al.
The Effective Extrusion Variables on the Fundamental Properties of Tubular Polythene Film, Huck and Clegg, pp. 1-14.

Affiliated with

Also associated with

Rating

Maleic anhydride graft copolymers having low yellowness index an does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Maleic anhydride graft copolymers having low yellowness index an, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Maleic anhydride graft copolymers having low yellowness index an will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2135464