Vinylpyrrolidone grafted polyolefins in polymer blends and compo

Details Vinylpyrrolidone grafted polyolefins in polymer blends and compo Vinylpyrrolidone grafted polyolefins in polymer blends and compo

1989-06-02

1991-10-29

Seccuro, Carman J.

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

Synthetic resins

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

525 58, 525 66, 525 67, 525 69, 525 73, 525283, 524 35, C08L 2904, C08L 5106, C08L 2304, C08L 2310

Patent

active

050617516

ABSTRACT:
A thermoplastic composition containing a first phase of a polar thermoplastic polymer, a second phase of non-polar polyolefin incompatible therewith, and a vinylpyrrolidone grafted polyolefin at least at an interface to compatibilize the different phases. A mixed phase monolayer of the composition containing ethylene-vinyl alcohol copolymer blended with vinylpyrrolidone grafted polypropylene as the first phase, and polypropylene as the second phase, has good oxygen and moisture barrier properties for food packaging applications. Also disclosed is a tieless multilayer laminate of the composition having an interlayer of a blend of ethylene-vinyl alcohol copolymer and vinylpyrrolidone grafted polypropylene and outer layers of polypropylene. The laminate has good oxygen and moisture barrier properties for food packaging applications. Further disclosed is a method for grafting vinylpyrrolidone onto polypropylene and polyethylene by melt blending the vinylpyrrolidone and the polyolefin to be grafted in the presence of a free radical initiator for a time effective to obtain a vinylpyrrolidone grafted product.

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