Durable polyhydroxyalkanoate compositions

a technology of polyhydroxyalkanoate and composition, applied in the field of durable polyhydroxyalkanoate composition, can solve the problems of lack of thermal stability, poor processability, and inability to meet the requirements of use, and achieve the effects of improving processing properties, improving aesthetics, and improving processing properties

Inactive Publication Date: 2019-05-16
SABIO SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text discusses the use of certain components to improve the mechanical properties of a PHA composition. It states that the presence of PLA reduces impact resistance and elongation at break, while the presence of PBS as a single component only marginally improves elongation at break. However, using both TPU and PBS in combination results in a synergistic effect, significantly improving both impact resistance and elongation at break. The text also mentions that the use of an acrylic polymer, specifically an acrylic block copolymer or an acrylic terpolymer, in combination with TPU, improves the mechanical properties of the PHA composition. The optimal combination is TPU and acrylic polymer in a ratio of 2:1 to 1:3. Overall, the patent aims to improve the durability and mechanical properties of PHA compositions through the use of specific components and a combination of TPU and acrylic polymer.

Problems solved by technology

Biodegradability for non-disposable and / or durable goods is then a disadvantage.
For durable goods, the presence of degradability enhancing components like PLA and starch are clearly undesired.
PLA, being rather crystalline in nature, is undesired also for its lack of thermal stability and rather poor processability.
On the other hand, the compositions are based on PLA and therefore not an ideal replacement of conventional plastics.
It is therefore not as easy to melt process into consumer articles, and the articles so produced are more fragile.
Unfortunately, so far no compositions that contain more than 20% wt of non-fossil carbon have been found that can meet the demands both of the producers and the end-users.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

, Comparison with PP

[0072]Table 1 shows a comparison between a PP based composition based on 69.2% wt polypropylene, 0.5% wt antioxidant; 0.8% wt titanium dioxide and 29.5% wt talc and a PHA composition according to the invention, containing 56.5% wt P(3HB-co-3HV), 16.0% wt TPU, 0.5% wt antioxidant, 3.5% wt epoxidized soybean oil and 23.5% wt talc. The table shows that the PHA composition is very similar to the PP based composition, even outperforming the PP based composition in terms of flexural modulus, thermal properties and gloss.

[0073]The table here below represents the amounts of the ingredients of the PP-based composition and the PHA-based composition.

TABLE 1PP-basedPHA-basedcompositioncompositionMechanicalStrength atASTMMPa2827propertiesbreakD638FlexuralASTMMPa30403255modulusD790ThermalVicat BASTM° C.9397propertiesD1525AestheticalGloss 60°3675propertiesSurfacemN / m3138TensionEnviron-% wt of% wt060mentalingre-propertiesdientswithcarbonfromrenew.sources

Example 2, Adverse Effect...

example 2

, Component (II)

[0075]Table 4 shows a composition containing the pure PHA (comparative) and compositions containing TPU polymer, acrylic polymer or a mixture of polyurethane and acrylic polymers. Table 5 reports measures of physical properties.

[0076]Entry 4, Entry 5 in comparison to Entry 3 show that the presence of the claimed non-HPA component (II), either an acrylic polymer or TPU polymer improve the values of both Resilience and Elongation at break.

[0077]Entry 5 in comparison to Entry 4 shows that the presence of acrylic polymers leads to a higher value of elongation at break than the one exhibited by a composition containing the same amount of TPU. Thus an object made of a material whose composition is Entry 5 will withstand a higher deformation before breaking down than one whose composition is Entry 4.

[0078]Nevertheless a comparison between Entry 4 and Entry 5 shows that the presence of TPU leads to a higher value of Vicat than the one exhibited by a composition containing th...

example 4

, The Selection of Plasticizer

[0079]Table 6 shows compositions containing different plasticizers wherein epoxidized soybean oil is the preferred plasticizer according to the invention. Although glycerine, triethyl citrate and polyadipate are conventional plasticizers, in the current composition they are not preferred. In Table 7 the results are reported.

[0080]Entry 10, Entry 11, Entry 12, Entry 13 show different values of Elongation at break. The highest value is given by Entry 10 where epoxidized soybean oil is used. The use of epoxidized Soybean oil is preferred because represents the best trade-off between the properties of Elongation at Break and resistance to heat softening.

TABLE 6Entry 10Entry 11Entry 12Entry 13P(3HB-CO-3HV)39%39%39%39%TPU19%19%19%19%Acrylic polymer19%19%19%19%Glycerine 5%Epoxidized soybean oil 5%Triethyl citrate 5%Polyadipate 5%Talc18%18%18%18%100% 100% 100% 100    

TABLE 7EntryEntryEntryEntry10111213Izod test,ASTMJ / mRPRPRPRPnotched (0° C.)D256Charpy test,ISO ...

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Abstract

A polyhydroxyalkanoate composition, having a an elongation at break (ASTM D648) greater than 3%, an impact resistance (IS0179 1 eA, 23° C., unnotched) greater than 18 KJ / m2 and a flexural modulus of at least 950 MPa, includes at least 25% wt of a polyhydroxyalkanoate component (I); from 5 to 40% wt of a mixture (II) of a thermoplastic polyurethane and an acrylic polymer; from 0 to 40% wt of one or more fillers (III); from 0 to 20% wt of one or more plasticizers (IV); and from 0 to 10% wt of one or more additives (V). The polyhydroxyalkanoate composition can be used for the preparation of durable goods that may be labelled as containing more than 20% non-fossil carbon, and for articles prepared therefrom.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. application Ser. No. 15 / 668,831, filed Aug. 4, 2017, which is a divisional of U.S. application Ser. No. 14 / 379,810, filed Aug. 20, 2014, now abandoned, which is the National Stage of International Application No. PCT / EP2013 / 053468, filed Feb. 21, 2013, which claims the benefit of Italian Application No. TO2012A000155, filed Feb. 21, 2012, the contents of all of which are incorporated by reference herein.TECHNICAL FIELD[0002]The current invention concerns durable polyhydroxyalkanoate compositions. More in particular, the present invention relates to polymeric compositions that are based on polyhydroxyalkanoate polymers, which are biodegradable and renewable bioplastics, and that can be melt processed similar to polypropylene based compositions into various forms such as moulded articles, films, fibers and nonwovens, and the like.BACKGROUND ART[0003]While aromatic polyesters are almost totally resi...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C08L67/04C08L23/08C08L51/04C08L75/04
CPCC08L67/04C08L23/0884C08L51/04C08L75/04C08L23/0869C08L2203/12C08L2203/16C08L2207/04C08L2201/06
InventorCARFAGNINI, ALESSANDROBELLOMO, LEONARDO
OwnerSABIO SRL