Improved, low viscosity, shelf stable, energy-actiivated compositions, equipment, sytems and methods for producing same

Inactive Publication Date: 2013-07-25
HB FULLER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an improved system for processing heat-activatable materials. It includes a heat break and a friction loss component that work together to prevent the material from solidifying in parts of the system where it cannot be reheated. The heat break can also be combined with a chemical heat break check to ensure complete prevention of plugging. Overall, this invention results in less waste, better shelf life, improved system stability, consistent start-up processing, no pack outs and ultimate performance advantages.

Problems solved by technology

There are several drawbacks with the use of conventional hot melt dispensing systems including handling solids, high energy consumption, polymer decomposition, expensive equipment, safety concerns and the like.
Compositions such as disclosed by Stumphauzer et al. and Jorgenson et al. tend to be thermodynamically unstable, meaning that pressure, shear forces or polymer hysteresis, chemical induced differentials on the composition tend to cause the various components of the composition to separate (e.g., the liquid carrier can separate from the polymer solids).
While the prior art gives pumpable, liquid, polymer compositions that are reasonably stable to separation, they suffer from being high viscosity requiring complicated equipment solutions to satisfactorily transfer and dispense the compositions.
Alternatively, pumpable, liquid polymer compositions that are low viscosities can be prepared but have limited resistance to separation of the polymer and the liquid phases which creates consistency problems in storage, separation in hoses and / or in a heat break and inconsistent processing of the pumpable, liquid polymer compositions.

Method used

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  • Improved, low viscosity, shelf stable, energy-actiivated compositions, equipment, sytems and methods for producing same
  • Improved, low viscosity, shelf stable, energy-actiivated compositions, equipment, sytems and methods for producing same
  • Improved, low viscosity, shelf stable, energy-actiivated compositions, equipment, sytems and methods for producing same

Examples

Experimental program
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Effect test

examples 2a-2b

Exemplary Intermediate Examples 2A-2B

[0177]In preparing the exemplary examples for intermediates, the polypropylene, polyethylene and silica were heated to approximately 260° F. to create a molten homogeneous liquid. The molten material was dispensed using a standard hot melt unit with a module fitted with a spray pattern nozzle to dispense the molten liquid into the room temperature soybean oil to create the first set of exemplary Intermediate Examples 2A-2B. In this example, the intermediate was dispersed in oil that created domains where the oil was well below the melting or solubility temperatures but above the room temperature in the regions where the molten homogeneous liquid enters the carrier.

TABLE 5Exemplary IntermediateExemplary IntermediateIngredient ID2A2BSoybean Oil41.541.5Polypropylene-116.516.5Polyethylene-100.25Silica0.50.5

examples 3a-3c

Exemplary Intermediate Examples 3A-3C

[0178]In another embodiment of the invention the oil and silica were heated to approximately 200 to 230° F. and the highest melting polymers which had melting points of about 300° F., polypropylene and maleated polypropylene, were added, stirred and allowed to bring the temperature down to less than 190° F. where the polymer having lower melting points of about 200° F., polyethylene, was added stirred and allowed to cool.

TABLE 6ComparativeComparativeComparativeIntermediateIntermediateIntermediateIngredient ID3A3B3CSoybean Oil41.541.540.5Polypropylene-116.516.516.5Maleated PP-1004Polyethylene-1033Silica0.50.50.5% Premix Total58.561.564.5

examples 4a-4e

Exemplary Intermediate Examples 4A-4E

[0179]In another embodiment of the invention the oil and silica was heated to approximately 130° F. and the highest melting polymers which had melting points of about 300° F., polypropylene and maleated polypropylene, were added, at which time the polymer having lower melting points of about 200° F., polyethylene, was added stirred and then the entire mixture was heat to 145° F. and the temperature is maintained for 20 minutes and then allowed to cool. Examples 4A and 4C.

[0180]Example 4B follows the same process as described for example 4A except for that at 100° F., the EVA is added to the formulation and mixed for 5 minutes. The mixture is then allowed to cool.

[0181]Example 4D follows the same process as described for example 4A except that instead of Silica, Pluronic F-127 surfactant is added to the oil at the start of the process.

[0182]Example 4E follows the same process as described for example 4A except that Irganox B225 is added to the oil...

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Abstract

The present invention provides low viscosity energy-activated room temperature polymer compositions, equipment, systems and methods for handling, activating and dispensing the thermodynamically unstable, high solids, activatable liquid compositions.

Description

PRIORITY CLAIM[0001]This application claims priority to U.S. App. Ser. No. 61 / 285,816, filed Dec. 11, 2009, U.S. App. Ser No. 61 / 294,679, filed Jan. 13, 2010, and U.S. App. Ser. No. 61 / 309,181, filed Mar. 1, 2010, each of which is hereby incorporated by reference in its entirety.BACKGROUND OF INVENTION[0002]1. Field of Invention[0003]The present invention provides low viscosity energy-activated room temperature polymer compositions, equipment, systems and methods for handling, activating and dispensing the thermodynamically unstable, high solids, activatable liquid compositions.[0004]2. Description of Related Art[0005]Hot melt adhesives are routinely used in various applications where a stable surface-to-surface bond must be formed. Further, hot melt adhesives are used in securing a variety of both similar and dissimilar materials (e.g., cellulosic substrates such as wood, corrugated paper, cardboard, paper, carton stock, and other substrate materials such as plastics, metals, fabri...

Claims

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Application Information

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IPC IPC(8): B65D83/14
CPCC09J123/10B65D83/14C08L23/06C08L51/06C08L91/00C08L2205/03
Inventor JORGENSON, MICHAEL W.KOETH, DANIELLE E.KROTINE, JR., JEFFREY C.
Owner HB FULLER CO
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