Maleated high acid number high molecular weight...

Details Maleated high acid number high molecular weight... Maleated high acid number high molecular weight...

2005-02-04

2008-08-05

Woodward, Ana L (Department: 1796)

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

Synthetic resins

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

C525S184000, C525S284000, C525S333700, C525S387000

Reexamination Certificate

active

07408007

ABSTRACT:
A process for the manufacture of maleated polypropylenes having an acid number greater than 4.5, a yellowness index color of no greater than 76, and a number average molecular weight of at least 20,000. The process for making the maleated polypropylenes includes forming a mixture of molten polypropylene and molten maleic anhydride in a reactor, introducing a free radical initiator into the molten mixture to produce a product having maleic anhydride grafted onto the polypropylene, and recovering a high acid number, high molecular weight maleated polypropylene of low color from the reactor.

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