High resilience foams

A kind of resilience, foam technology, applied in examples 53 to 56 of 004/096882, in the field of flexible polyurethane foam, can solve problems such as reducing the rebound value of falling balls

Inactive Publication Date: 2010-06-16
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of natural oil based polyols in place of conventional polyols in HR foams has been shown to reduce the ball rebound values ​​disclosed in Examples 53 to 56 of WO 2004 / 096882

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0093] Examples 1-3 and comparative samples A-C:

[0094] The foams described in Table 1 were prepared using Method A:

[0095] Table 1, Examples 1-3 and Comparative Samples A-C

[0096] Example (Ex)

[0097] Example (Ex)

[0098] The data in Table 1 shows that PEOP-2 when used with NOPO-1 at levels up to 40% gives foam resiliency of 40% or greater. The rebound resilience of Comparative Samples A and C without NOPO-1 was above 50%. Comparative Example B of NOPO-1 based on PEOP-1 and 30PHP is just above 40% resilience and will therefore fail at 40PHP. This shows that the polyether polyol equivalent weight is important when using a combination of natural oil based polyols and polyether polyols to prepare HR foams.

Embodiment 4

[0099] Example 4 and comparative samples D-F:

[0100] Method A was used to prepare the foams described in Table 2:

[0101] Table 2, embodiment 4 and comparative samples D-F

[0102] Example (EX)

[0103] Example (EX)

[0104] Example (EX)

[0105] The data in Table 2 show that foams can be obtained with PEOP-2 and 30PHP NOPO-1, which have a resilience of 45% and low dry and humid aged Compression Sets. ). The properties of these foams were close enough to those of the control CS D to meet typical OEM specifications.

Embodiment 5-8

[0107] Method A was used to prepare the foams described in Table 3:

[0108] Table 3, Examples 5-8

[0109] Example (EX)

[0110] Example (EX)

[0111] The data in Table 3 show that foam properties are maintained by using the diol PEOP-3. CAT-1 (DMEA), although it opened the foam, was not as effective as CAT-2 in curing the foam skin and stabilizing the rising foam. However, the properties of the foam are maintained.

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Abstract

A high resilience (HR) polyurethane foam comprising the reaction product of (1) at least one polyisocyanate comprising at least about 5 weight percent of at least one methylene diphenyl diisocyanate isomer, derivative or a combination thereof and (2) an admixture of at least one natural oil based polyol and at least one additional polyol which is not a natural oil based polyol, wherein the admixture comprises at least about 10 weight percent natural oil based polyol and at least about 40 weight percent additional polyol having an equivalent weight of at least about 1700 Daltons; and the foam has a resiliency indicated by a ball rebound of at least 40 percent as measured according to the procedures of ASTM D 3574, Test H. An HR foam is made according to a process comprising steps of (a) forming a natural oil based polyol composition comprising at least about 10 weight percent of at least one natural oil based polyol having an OH functionality of at least about 2.2 and an equivalent weight of at least about 500 Dalton (Da) and at least about 40 weight percent of at least one conventional polyol having an equivalent weight of at least about 1700 Da and water; (b) admixing at least one catalyst with the natural oil based polyol composition to form a catalyst polyol admixture; (c) supplying a poly isocyanate comprising at least about 5 weight percent of at least one methylene diphenyl diisocyanate isomer, derivative or combination thereof in an amount corresponding to an isocyanate index of at least about 55 and at most about 105 and (c) admixing the isocyanate with the catalyst polyol admixture. The foams are useful in such applications as comfort, sound absorption including noise dampening, harshness dampening, protection, packaging, medical equipment, safety equipment and combinations thereof.

Description

Background technique [0001] The present invention relates to flexible polyurethane foams, preferably such foams based on natural oils and having high resilience. [0002] Foam articles, especially polyurethane foam articles, have been known for many years and are used in many applications, especially for car seats, cushioning and mattresses. Polyurethane foams are referred to as high resiliency (HR) if they have a resiliency, as measured by ASTM D3574 Test H, of greater than about 40 percent. High resilience foams are often foamed using petroleum derived polyols having a nominal functionality averaging about 3 hydroxyl groups per molecule and an average molecular weight of about 5,000. These foams are produced with an isocyanate index of 65 to 115, typically using water levels of up to about 5.0 parts by weight per hundred parts by weight polyol (pphp). [0003] It is desirable to use an isocyanate based on methylene diphenyl diisocyanate (MDI) because it has a lower vapor p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/32C08G18/48C08G18/61C08G18/66C08G18/72C08G18/76
CPCC08G2101/0083C08G18/7664C08G18/6681C08G18/4009C08G18/61C08G18/4812C08G18/4891C08G18/10C08G18/4829C08G18/4837C08G18/721C08G2101/005C08G18/4816C08G18/3275C08G2110/005C08G2110/0083
Inventor 弗朗索瓦·卡萨蒂琼-玛丽·桑尼
Owner DOW GLOBAL TECH LLC
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