Granted Patent
B2
US 12,729,302 · App. 17/311,631 · Granted Sep 8, 2026
Bio-based polymer compositions and methods of making and using thereof
Inventors:
Yael Vodovotz (Columbus, OH); Katrina Cornish (Wooster, OH); Kurt Koelling (Powell, OH); Xiaoying Zhao (Columbus, OH); Varun Venoor (Lowell, MA)
Assignee:
Ohio State Innovation Foundation
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Abstract
Disclosed are polymeric compositions comprising polyhydroxyalkanoates. These compostions can comprise a blend comprising a polyhydroxyalkanoate (PHA) polymer, and a rubber polymer. The blend can comprise a biphasic mixture comprising a first phase comprising the PHA polymer, and a second phase comprising the rubber polymer dispersed with the first phase. The rubber polymer can be crosslinked, for example, through reaction with a free radical initiator. By incorporating the dynamically crosslinked rubber polymer, the polymer composition can exhibit one or more improved characteristics relative to PHA alone, including improved thermal stability, improved melt strength, improved flexibility, improved toughness, or a combination thereof. Also provided are articles formed at least in part from these polymeric compositions, as well as methods of making these polymeric compositions.
Claims (27)
1 . A polymeric composition comprising a blend comprising:
a polyhydroxyalkanoate polymer comprising poly(3-hydroxybutyrate-co-3-hydroxypropionate), poly(3-hydroxybutyrate-co-4-hydroxybutyrate), poly(3-hydroxybutyrate-co-4-hydroxyvalerate), poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), poly(3-hydroxybutyrate-co-5-hydroxyvalerate), poly(3-hydroxybutyrate-co-6-hydroxyhexanoate), or combinations thereof; and
a rubber polymer, wherein the rubber polymer comprises natural rubber other than epoxidized natural rubber (ENR);
wherein the blend is formed by melting the polyhydroxyalkanoate polymer and the rubber polymer in the presence of a free radical initiator.
2 . The composition of claim 1 , wherein the rubber polymer is present in the blend in an amount of from 1% to 40% by weight, based on the total weight of all polymers present in the blend.
3 . The composition of claim 1 , wherein the polyhydroxyalkanoate polymer is present in the blend in an amount of from 60% to 99% by weight, based on the total weight of all polymers present in the blend.
4 . The composition of claim 3 , wherein the polyhydroxyalkanoate polymer comprises poly(3-hydroxybutyrate-co-3-hydroxyvalerate).
5 . The composition of claim 4 , wherein the poly(3-hydroxybutyrate-co-3-hydroxyvalerate) comprises from 99 mol % to 85 mol % 3-hydroxybutyrate and 1 mol % to 15 mol % 3-hydroxyvalerate.
6 . The composition of claim 1 , wherein the blend is formed by reactively extruding a mixture comprising the polyhydroxyalkanoate polymer, the rubber polymer, and a free radical initiator.
7 . The composition of claim 1 , wherein the free radical initiator comprises a peroxide.
8 . The composition of claim 1 , wherein the free radical initiator is present in an amount from 0.1 to 5 parts per hundred rubber.
9 . The composition of claim 1 , wherein the renewable carbon content of the blend is at least 50% by weight, as measured according to the standard method described in ASTMD6866-18.
10 . The composition of claim 1 , wherein the blend exhibits at least two distinct glass transition temperatures.
11 . The composition of claim 1 , wherein the blend exhibits:
a flexural modulus of less than 3250 MPa as measured according to the standard method described in ASTM D790-15;
a flexural modulus of from 750 MPa to 3250 MPa as measured according to the standard method described in ASTM D790-15;
a tensile strength of from 12 MPa to 33 MPa as measured according to the standard method described in ASTM D638-08;
a notched impact strength of at least 28 J/m as measured according to the standard methods described in ASTM D256-10;
a degree of crystallinity of from 50% to 70%, as determined by differential scanning calorimetry (DSC);
or a combination thereof.
12 . The composition of claim 1 , wherein neat polyhydroxyalkanoate polymer exhibits a melting temperature and the blend exhibits a melting temperature, and
wherein the melting temperature of the blend is at least 2° C. less than the melting temperature of the neat polyhydroxyalkanoate polymer.
13 . The composition of claim 1 , wherein neat polyhydroxyalkanoate polymer exhibits an onset crystallization temperature and the blend exhibits an onset crystallization temperature, and
wherein the onset crystallization temperature of the blend is at least 2° C. less than the onset crystallization temperature of the neat polyhydroxyalkanoate polymer.
14 . The composition of claim 1 , wherein the composition is compostable, as determined by ASTM D6400-19.
15 . An article comprising the composition of claim 1 .
16 . The composition of claim 1 , wherein the rubber polymer does not comprise epoxidized natural rubber.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Jun 7, 2021
From: VODOVOTZ, YAEL; CORNISH, KATRINA; KOELLING, KURT; ZHAO, XIAOYING; VENOOR, VARUN
To: OHIO STATE INNOVATION FOUNDATION
Reel/Frame 056510/0284 →
Continuity (2)
Provisional Application
62776755
· Dec 7, 2018
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