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Surface treated inorganic particle additive for increasing the toughness of polymers

A technology of inorganic particles, biopolymers, applied in applications, household appliances, garbage collection, etc., can solve problems such as poor mechanical strength

Inactive Publication Date: 2010-12-15
SPECIALITY MINERALS (MICHIGAN) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various polymers have been developed for biodegradability, however these polymers often have poor mechanical strength making them unsuitable for certain applications or e.g. requiring undesirably thick films for spoolability and break-free processing

Method used

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  • Surface treated inorganic particle additive for increasing the toughness of polymers
  • Surface treated inorganic particle additive for increasing the toughness of polymers
  • Surface treated inorganic particle additive for increasing the toughness of polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In a laboratory experiment, the inventors were able to demonstrate the beneficial effect of fatty acid-coated calcium carbonate additives in improving the toughness of PLA polymers. Specifically, improvements in room- and low-temperature impact toughness as well as improvements in rigidity of PLA were demonstrated.

[0031] The properties of PLA polymers can be controlled by controlling the ratio of stereoisomers comprising PLA. For example, polymerization of predominantly L-form with greater than about 15 mole percent D-form or meso-lactide produces amorphous PLA random copolymers. Polymerization of L-lactic acid instead produces poly-L-lactide (PLLA), which is a semi-crystalline polymer with crystallinity up to 40% or more.

[0032] The inventors used a number of different calcium carbonate-based additives, coated them with stearic acid, and compounded them into PLLA polymer samples to demonstrate the beneficial effect of stearic acid-coated calcium carbonate on the ...

Embodiment 2

[0049] Figure 6 Shown against uncoated The coating level of Bio's calcium carbonate precursor particles was studied to determine the results of the optimal coating level. The falling weight impact energy was determined for PLA polymer samples prepared from polymer resin composited with calcium carbonate particles at various coating levels. Calcium carbonate precursor samples were dry coated to each coating level (0.0 to 4.0 wt %) using a laboratory Henschel mixer. However, the coating method is not limited to the dry coating method. Wet coating methods can also be used. Each calcium carbonate material was compounded into PLLA at a target concentration of 25 wt%. Toughness in this test is measured as a falling weight. Figure 6 The resulting curve in shows the classic "S-shaped" curve60, which indicates the minimum coating level required to improve the impact toughness of PLLA. From the sloped portion 62 of the "S-curve" it is estimated that a minimum coating of about 2...

Embodiment 3

[0062] PLA test pieces of different thicknesses and containing different amounts of coated calcium carbonate were produced on a Brabender Intellitorque using a single-screw extruder with different die gaps and strip pullers at different speeds. Mechanical properties were determined using the Gardner impact test and the Elmendorf tear test at 23°C. The results are shown in Figure 8 and Figure 9 In the results, the filler shows a significant improvement in Gardner impact resistance. Figure 8 The average drop height required for failure of PLA samples containing different amounts of coated filler is shown. Figure 9 The force required to propagate a tear according to the Elmendorf tear test of various PLA samples containing coated fillers is shown, and a significant increase in tear strength is shown in the filled samples.

[0063] The aspect ratio distribution of the material was determined by TEM micrographs described earlier in this paper and at Figure 7 displayed in ....

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Abstract

A bioplastic composition comprising a biopolymer containing from 10 - 40 wt% of coated inorganic particles; the particles being coated with one or more of fatty acids, fatty acid derivatives, rosins, rosinates, polyolefin based waxes, oligomers and mineral oils, and combinations thereof has improved stiffness and toughness and also has improved crystallisation kinetics rendering it useful for extrusion, injection moulding and thermoforming.

Description

technical field [0001] The present invention relates to improvements in or relating to polymer compositions. In particular, the present invention relates to bioplastic systems comprising biopolymer materials which are biodegradable and or derived from renewable resources and which have sufficient improved strength. Improved strength manifests itself through a combination of stiffness and toughness. In one embodiment, the improved strength allows the polymer to be processed into films and used in economically attractive reduced thicknesses; it also allows the production of thermoformed articles such as food trays from thinner materials. Plastic films have many uses, and the economics of film manufacture and use are often limited by the film thickness required to provide certain mechanical properties. The thinner the film the better to provide the desired properties. The present invention can also improve the crystallization kinetics of biopolymers, which can improve the proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04
CPCC08K9/04B65F1/0006C08L67/04
Inventor P·C·韦奈特
Owner SPECIALITY MINERALS (MICHIGAN) INC
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