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Dry melt coating process and formulation for volatile compounds

A technology of volatile compounds and compounds, applied to the preservation of plants, animal repellants, plant growth regulators, etc.

Inactive Publication Date: 2016-01-13
AGROFRESH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Many methods in which the product is encapsulated in a liquid or solid matrix (obtained using various methods) have been tried, but with little success

Method used

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  • Dry melt coating process and formulation for volatile compounds
  • Dry melt coating process and formulation for volatile compounds
  • Dry melt coating process and formulation for volatile compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1 - Release rate results

[0084] used in experiments 30% HAIP in 2304 resin was performed. Mesh #45 was used to grind particles to image 3 shown. Addition of 2% surfactant (eg Dawnsoap from Procter & Gamble) enhanced 1-MCP release under the conditions tested.

[0085]

Embodiment 2- 2

[0086] Example 2 - Silica Coating

[0087] Two silica powders were tested in this example: R202 and R8200 (Evonik Degussa Corporation Inorganic Materials, 2 Turner Place Piscataway, NJ08855). Both are highly hydrophobic treated silicas. R8200 is denser and is believed to support the particles better during the second melting (ie, coating) process.

[0088] R202 is fumed silica after treatment with polydimethylsiloxane. BET surface area is 100±20[m 2 / g]. R202 is one of the most hydrophobic silicas (hydrophobic rating by Evonik).

[0089] R8200 is a structure modified with hexamethyldisilazane after treated fumed silica. BET surface area is 160±25[m 2 / g].

[0090] The release rate results in water containing 1% surfactant are shown in Table 2.

[0091]

[0092]

Embodiment 3

[0093] Example 3 - Clay Coating

[0094] The clay was originally used for the scaffolding support that adhered the silica to the core particles. Unexpectedly, clay itself appears to be a suitable coating material / coating particle. Various types of organoclay were tested in this example.

[0095]

[0096] 1000 is an organic derivative of bentonite from Elementis Specialties (Elementis Specialties, Inc. 329 Wyckoffs Mill Road, Hightstown, NJ08520). This rheological additive is designed for use in low to moderately polar organic systems. The experimental results using Bentone 1000 are shown in Table 3.

[0097] 27 The rheological additive is an organoclay (trialkylarylammonium hectorite) (available from Elementis) designed for low to moderate polarity systems.

[0098] 38 is an organic derivative of hectorite clay. This rheological additive is designed for use in low to moderately polar organic systems (available from Elementis).

[0099] 34 is an organic derivat...

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Abstract

This invention is based on surprising results that dry-coat particles using a melt process where the dispersed melted polymer core (for example a linear polyester diol containing dispersed HAIP) can bead up effectively in a surrounding hydrophobic powder. One good coating powder is identified as organoclay. Silica coating also works well when combined with clay coating. With the coating provided, this invention enables generation of a stable powder with, for example approximately 20%, HAIP loading using a simple grinding and sieving process. The formulations provided can release less than 25% 1-MCP over a period of 4 hours under stirring conditions.

Description

Background technique [0001] Volatile compounds such as 1-methylcyclopropene (1-MCP) can be trapped in cyclodextrins, and the resulting product, in the case of 1-MCP, is a complex known as a high active ingredient product (or HAIP for short). HAIP contained on average 1-MCP at a concentration of 4.5%. HAIPs are composed of long crystals that cannot be suspended due to their large size (up to 100-150 μm in length). However, some air-milled products can be produced with an average particle size of about 3-5 [mu]m (microns). [0002] Because HAIP rapidly releases 1-MCP when in contact with water, producing a tank-mixable formulation clearly presents challenges. Also, from a safety perspective, the release of flammable 1-MCP in an enclosed space (ie, a sealed tank) above a concentration threshold of 13,300 ppm is problematic. It is therefore advisable (for safety and legal considerations) that when mixed in a stirred tank, 1-MCP is released at typical application rates over a pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N27/00A01N3/02A01N25/10A01N25/26
CPCA01N3/02A01N27/00A01N25/10A01N25/26A01N25/28B05D1/02
Inventor C·G·贝克
Owner AGROFRESH