IP Library › Granted Patent US 12,643,988
Granted Patent B2
US 12,643,988 · App. 17/838,191 · Granted Jun 2, 2026

Composition of polymers derived through the maleation of depolymerized polypropylene

Inventors: Domenic Di Mondo (Brampton, CA); Irina Fenton (Burlington, CA)
Assignee: GreenMantra Recycling Technologies Ltd.
C08J11/10C08F110/06C08F2810/00C08J2323/12
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Quick Facts
Patent No.
US 12,643,988
App. No.
17/838,191
Granted
Jun 2, 2026
Kind
B2
Abstract

Polymers are created via the depolymerization of a polypropylene feedstock. The polymers can be modified/grafted with maleic anhydride. In some embodiments the polypropylene feedstock contains recycled or discarded polypropylene. In some embodiments, the polymers contain olefins within the polymer backbone, and/or a suspension of iron, titanium, and/or zinc.

Claims (56)

1 . A composition comprising:

a depolymerized polymer wherein said depolymerized polymer has been maleated,

wherein said depolymerized polymer is derived from depolymerization of a polypropylene feedstock via a depolymerization process,

wherein said polypropylene feedstock comprises recycled polypropylene,

wherein said depolymerized polymer comprises greater than 0.25% olefin content on the backbone of the chain,

wherein said depolymerized polymer has a weight-average molecular weight between and inclusive of 500-45,000 atomic mass units,

wherein said depolymerized polymer has been maleated to an acid number greater than 1 mg KOH/g,

wherein said composition further comprises greater than 25 ppm zinc.

2 . The composition of claim 1 , wherein said depolymerization process is at least partially thermal.

3 . The composition of claim 1 wherein said depolymerization process is at least partially catalytic.

4 . The composition of claim 1 , wherein the polypropylene feedstock comprises a post-industrial derived recycled polypropylene or a post-consumer derived recycled polypropylene.

5 . A composition comprising:

a depolymerized polymer wherein said depolymerized polymer has been maleated;

greater than 25 ppm iron;

greater than 25 ppm zinc; and

greater than 50 ppm titanium,

wherein said depolymerized polymer is derived from depolymerization of a polypropylene feedstock via a depolymerization process,

wherein said polypropylene feedstock comprises recycled polypropylene,

wherein said depolymerized polymer has a weight-average molecular weight between and inclusive of 500-45,000 atomic mass units,

wherein said depolymerized polymer has been maleated to an acid number greater than 1 mg KOH/g.

6 . The composition of claim 5 , wherein said depolymerized polymer comprises greater than 0.25% olefin content on the backbone of the chain.

7 . The composition of claim 5 wherein said depolymerization process is at least partially catalytic.

8 . The composition of claim 5 , wherein the polypropylene feedstock comprises post-industrial derived recycled polypropylene.

9 . The composition of claim 5 , wherein the polypropylene feedstock comprises post-consumer derived recycled polypropylene.

10 . The composition of claim 5 , wherein said polypropylene feedstock comprises greater than 5% of post-consumer derived recycled polypropylene.

11 . The composition of claim 5 , wherein said polypropylene feedstock comprises between 5% to 30% material that is other than polypropylene material based on the total weight of said polypropylene feedstock.

12 . A composition comprising:

a depolymerized polymer wherein said depolymerized polymer has been maleated,

wherein said depolymerized polymer is derived from depolymerization of a polypropylene feedstock via a depolymerization process,

wherein said polypropylene feedstock comprises recycled polypropylene,

wherein said depolymerized polymer comprises greater than 0.25% olefin content on the backbone of the chain,

wherein said depolymerized polymer has a weight-average molecular weight between and inclusive of 500-45,000 atomic mass units,

wherein said depolymerized polymer has been maleated to an acid number greater than 1 mg KOH/g,

wherein said composition further comprises greater than 50 ppm titanium.

13 . The composition of claim 12 wherein said depolymerization process is at least partially catalytic.

14 . The composition of claim 12 , wherein the polypropylene feedstock comprises a post-industrial derived recycled polypropylene or a post-consumer derived recycled polypropylene.

15 . A composition comprising:

a depolymerized polymer wherein said depolymerized polymer has been maleated,

wherein said depolymerized polymer is derived from depolymerization of a polypropylene feedstock via a depolymerization process,

wherein said polypropylene feedstock comprises recycled polypropylene,

wherein said depolymerized polymer comprises greater than 0.25% olefin content on the backbone of the chain,

wherein said depolymerized polymer has a weight-average molecular weight between and inclusive of 500-45,000 atomic mass units,

wherein said depolymerized polymer has been maleated to an acid number greater than 1 mg KOH/g,

wherein said composition further comprises greater than 25 ppm iron.

16 . The composition of claim 15 wherein said depolymerization process is at least partially catalytic.

17 . The composition of claim 15 , wherein the polypropylene feedstock comprises a post-industrial derived recycled polypropylene or a post-consumer derived recycled polypropylene.

18 . A composition comprising:

a depolymerized polymer wherein said depolymerized polymer has been maleated,

wherein said depolymerized polymer is derived from depolymerization of a polypropylene feedstock via a depolymerization process,

wherein said polypropylene feedstock comprises recycled polypropylene,

wherein said depolymerized polymer comprises greater than 0.25% olefin content on the backbone of the chain,

wherein said depolymerized polymer has a weight-average molecular weight between and inclusive of 500-45,000 atomic mass units,

wherein said depolymerized polymer has been maleated to an acid number greater than 1 mg KOH/g,

wherein said depolymerized polymer comprises at least one grafted succinate group.

19 . The composition of claim 18 , wherein said depolymerization process is at least partially catalytic.

20 . The composition of claim 18 , wherein the polypropylene feedstock comprises a post-industrial derived recycled polypropylene or a post-consumer derived recycled polypropylene.

Assignments (1)
NUNC PRO TUNC ASSIGNMENT Recorded Oct 24, 2022
From: DI MONDO, DOMENIC; FENTON, IRINA
To: GREENMANTRA RECYCLING TECHNOLOGIES LTD.
Reel/Frame 061515/0829 →
Continuity (3)
Continuation PCTCA2020000141 · Dec 11, 2020
Provisional Application 62946647 · Dec 11, 2019
Related Publication 20220315726A1 · Oct 6, 2022
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