Maleated polypropylenes and processes for the preparation thereof
AssigneeHoneywell International Inc.
InventorScott M. Hacker
Life of this patent
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Abstract
Disclosed are methods for advantageously producing maleated polypropylenes having a relatively high percentage of bound maleic anhydride, based on the total amount of maleic anhydride moieties present in the grafting reaction product, and the maleated polypropylenes produced therefrom. The methods produce maleated polypropylenes wherein at least about 60% of the maleic anhydride moieties in the grafting reaction product are bound to the polypropylene.
Claims28
A composition comprising:
- (a) a graft copolymer product comprising (i) backbone comprising polypropylene or derived from polypropylene, and (ii) bound maleic anhydride moieties;
- said graft copolymer having an average molecular weight of not greater than about 20,000 and a viscosity of from about 200 to about 1000 cps at about 190° C.;
- and
- (b) unbound maleic anhydride moieties,
- wherein said unbound maleic anhydride moieties are present in a concentration less than about 50% by weight of the total bound and unbound maleic anhydride present in the compatibilizing agent;
- wherein said graft copolymer is a product of a grafting reaction;
- and
- wherein said unbound maleic anhydride comprises unreacted maleic anhydride and oligomers containing maleic anhydride moieties.
A composition comprising:
- (a) a graft copolymer product comprising (i) polypropylene backbone derived from polypropylene, and (ii) bound maleic anhydride moieties;
- said graft copolymer having an average molecular weight of not greater than about 25.000 and a viscosity of from about 1000 to about 25.000 cps at about 190° C.;
- and
- (b) unbound maleic anhydride moieties,
- wherein said unbound maleic anhydride moieties are present in a concentration of less than about 50% by weight of the total bound and unbound maleic anhydride moieties present in the compatibilizing agent;
- wherein said graft copolymer is a product of a grafting reaction;
- and
- wherein said unbound maleic anhydride comprises unreacted maleic anhydride and oligomers containing maleic anhydride moieties.
A process for producing compositions containing maleated polypropylene, said process comprising grafting maleic anhydride to polypropylene in a melt reaction wherein said maleic anhydride is added to the melt at a rate and under conditions effective to produce a grafting reaction product having at least about 50% by weight of bound maleic anhydride based on the total weight of bound and unbound maleic anhydride moieties in the grafting reaction product;
- and wherein said unbound maleic anhydride comprises unreacted maleic anhydride and oligomers containing maleic anhydride moieties.
A process for producing maleated polypropylene comprising the step of reacting maleic anhydride with polypropylene in a reaction mixture comprising a concentration of maleic anhydride maintained so as to produce a reaction product in which at least about 60% by weight of maleic anhydride moieties in the reaction product are bound maleic anhydride, based on the total weight of bound and unbound maleic anhydride moieties in the reaction product;
- wherein said unbound maleic anhydride comprises unreacted maleic anhydride and oligomers containing maleic anhydride moieties.
Dependencies are inferred from the claim text.