Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
103 words
A method for the grafting of alpha,beta-unsaturated acids and anhydrides onto polypropylene comprising the steps of: (a) admixing polypropylene in melt processing apparatus with 0.01 to 5% by weight of at least one of alpha,beta unsaturated carboxylic acid and alpha,beta-unsaturated carboxylic anhydride and 0.01 to 2% by weight of an organic peroxide at a temperature above the melting point of the polypropylene, said melt processing apparatus being a twin-screw extruder comprised of a pair of elongated communicating barrels with parallel adjacent rotatable screws located therein, said screws having flights thereon that are in a non-intermeshing relationship; and (b) extruding and recovering grafted polypropylene.
Claim 2
Independent Claim
103 words
A method for the grafting of alpha,beta-unsaturated acids and anhydrides onto polypropylene comprising the steps of: (a) admixing polypropylene in melt processing apparatus with 0.01 to 5% by weight of at least one of alpha,beta unsaturated carboxylic acid and alpha,beta-unsaturated carboxylic anhydride and 0.01 to 2% by weight of an organic peroxide at a temperature above the melting point of the polypropylene, said melt processing apparatus being a twin-screw extruder comprised of a pair of elongated communicating barrels with parallel adjacent rotatable screws located therein, said screws having flights thereon that are in a non-intermeshing relationship; and (b) extruding and recovering grafted polypropylene.
Claim 3
Dependent Claim
21 words
The method of Claim 1 in which the polypropylene is grafted with at least one of maleic acid and maleic anhydride.
Claim 4
Dependent Claim
22 words
The method of Claim 2 in which the amount of maleic anhydride is in the range of 0.1 to 0.4% by weight.
Claim 5
Independent Claim
25 words
The method of any one of Claims 1-3 in which the amount of organic peroxide is in the range of 0.05 to 0.5% by weight.
Claim 6
Independent Claim
29 words
The method of any one of Claims 1-4 in which the grafted polypropylene is treated with an aqueous solution of sodium hydroxide or has an alkaline material added thereto.
Claim 7
Dependent Claim
19 words
The method of Claim 5 in which the grafted polypropylene is treated with an aqueous solution of sodium hydroxide.
Claim 8
Dependent Claim
16 words
The method of Claim 5 in which the grafted polypropylene has an alkaline material added thereto.
Claim 9
Independent Claim
27 words
The method of any one of Claims 1-7 in which at least one of un-grafted polypropylene and a toughening agent is subsequently blended with the grafted polypropylene.
Claim 10
Independent Claim
17 words
The method of any one of Claims 1-8 in which the polypropylene is a homopolymer of propylene.
Claim 11
Independent Claim
50 words
The method of any one of Claims 1-8 in which the polypropylene is selected from block copolymers of propylene and ethylene in which the ethylene content is less than 25% by weight and random copolymers of propylene and ethylene in which the ethylene content is less than 8% by weight.