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Polyurethane foams for comfort applications

A polyurethane and foam technology, applied in the field of flexible polyurethane foam, can solve the problems of low compression set, heat dissipation, low foam density, etc.

Active Publication Date: 2020-08-07
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foam should be able to dissipate heat and absorb moisture, but the foam density should be low while also exhibiting low compression set

Method used

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  • Polyurethane foams for comfort applications
  • Polyurethane foams for comfort applications
  • Polyurethane foams for comfort applications

Examples

Experimental program
Comparison scheme
Effect test

example 1-2

[0095] Examples 1-2 and Comparative Samples A-F

[0096] A. Quasi-prepolymer formation

[0097] Quasi-prepolymers A-C were prepared from the ingredients as indicated in Table 1 in the following general manner. One or more polyols were dried to a moisture content of less than 250 ppm by heating the polyol to 100° C. overnight with stirring under nitrogen. A trace amount of benzoyl chloride was added to the dry polyol and stirred. Separately, one or more polyisocyanates are heated to 50°C and combined with one or more polyols. No urethane catalyst is added to the resulting reaction mixture, which contains not more than 1 part per million by weight of metal and not more than 100 parts per million of amine compound. The reaction mixture was heated at 75°C under nitrogen until a constant isocyanate content was obtained. The quasi-prepolymer was then cooled to room temperature and stored under nitrogen.

[0098] NCO content was measured according to ASTM D5155. The ethylene o...

example 2

[0122] Example 2 is the same as Comparative Sample B and Comparative Sample C except that both the silicone surfactant and the ethylene oxide / propylene oxide block copolymer are present in the aqueous phase. Density reduced to less than 60kg / m 3 , and the compression set was significantly reduced to 10%. At the same time, good moisture absorption is retained and a high air flow rate is obtained.

example 1

[0123] Example 1 shows the effect of using a quasi-prepolymer with a slightly lower ethylene oxide content. The density is significantly lower than any of Comparative Samples A-C, and the compression set is significantly lower. Moisture is retained. Example 1 represents a significant improvement over Comparative Samples A-C.

[0124] Comparative Sample D and Comparative Sample E demonstrate the effect of varying the amount of polymer polyol. Too little polymer polyol (D) or too much polymer polyol (E) can result in a significant and undesirable increase in compression set. Too little polymer polyol also results in a significant increase in density.

[0125] Comparative Sample F demonstrates the need for the quasi-prepolymer to contain oxyethylene groups. Quasi-prepolymers are not even capable of forming stable foams without the hydrophilic properties imparted by the oxyethylene groups.

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Abstract

Flexible polyurethane foams are made by reacting a hydrophilic quasi-prepolymer, water and a polymer polyol in the presence of a silicone surfactant and an ethylene oxide / higher alkylene oxide block copolymer. The foams exhibit desirably low densities and compression sets, and have good thermal and moisture-wicking properties. The foams are useful in bedding and other comfort applications in whichthey are exposed to body heat and bear at least a portion of the weight of the user. The thermal and moisture wicking properties contribute to perceived comfort for the user.

Description

technical field [0001] The present invention relates to flexible polyurethane foams suitable for comfort applications such as pillows, mattresses, mattress toppers and seat cushions. Background technique [0002] Polyurethane foam is used in very large quantities to make a cushioning material, especially for bedding and seating. The problem with these foams is that they do not conduct heat very efficiently. Thus, heat given off by the user is captured by the foam in the immediate vicinity of the user's body. This results in a localized temperature rise, often perceived as discomfort by the user. [0003] One way to solve this problem is to make the foam more hydrophilic. The polyurethane foams most commonly used in these applications are somewhat hydrophobic materials that do not absorb much moisture. The water vapor evaporated by the user is then trapped near the user's body. This increases the local relative humidity and promotes local trapping of heat and perceived d...

Claims

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Application Information

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IPC IPC(8): C08G18/12
CPCC08G18/4825C08G18/4833C08G18/4837C08G18/7671C08G18/00C08G18/12C08G2110/0058C08G2110/0008C08G18/302C08G18/632C08G2101/00
Inventor Y·斯里瓦斯塔瓦W·库恩斯
Owner DOW GLOBAL TECH LLC
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