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Viscoelastic foams with slower recovery and improved tear

A foam material, resilience technology, used in low resilience, viscoelastic foam materials, the production of low resilience field

Inactive Publication Date: 2013-06-12
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not uncommon for viscoelastic foams to exhibit a soft and smooth hand at room temperature, but become very hard and brittle as the temperature decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 5B

[0160] [0159] Example 5B: Properties of Examples 23-29

[0161] Example 23 24 25 26 27 28 29 Density, pcf 4.8 4.82 5.03 5.3 3.28 3.31 3.38 Resilience, % 1 12 9 9 23 15 15.5 Air flow(scfm) 0.05 0.79 0.62 1.21 0.03 0.04 0.03 IFD height, inches 2.71 2.14 2.59 2.7 3.95 3.94 3.95 25% IFD, lbs 10.51 10.19 15.25 10.81 57.64 43.35 53.68 65% IFD, lbs 25.25 n.d. 41.46 31.96 131.4 112.57 132.21 25% reply, % 84.09 n.d. 80.23 79.01 77.9 59.35 53.59 Support Factor (65% / 25%) 2.4 n.d. 2.72 2.96 2.28 2.6 2.46 50% CFD, psi 0.11 0.12 0.15 0.11 0.47 0.36 0.44 stretch, psi 6.99 9.597 13.15 11.46 28.1 15.95 22.91 elongation,% 158 200 209 192 179 86 113 tear strength, pli 0.71 0.887 1.2 0.66 2.49 0.99 1.65 50% compression set, % 15.43 68.86 17.45 8.25 13.2 21.84 19.78 75%HACS,% 11.95 43.55 13.13 5.6 13.34 23.81 17.8...

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PUM

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Abstract

This invention relates to low resilience, viscoelastic foams which have slower recovery and improved tear strength, and to a process for the production of these foams. The viscoelastic foams of the invention comprise the reaction product of a polyisocyanate with an isocyanate-reactive component, in the presence of a blowing agent, a surfactant and a catalyst. Suitable isocyanate-reactive components comprise at least about 5% by weight of at least one polyether polyol having about 2 to about 4 reactive hydroxyl groups per molecule, an equivalent weight of about 280 to about 2,000, and which is the alkoxylation product of an organic compound which contains at least two aromatic rings, contains from about 2 to about 4 Zerewitinoff active hydrogen atoms and has an equivalent weight of about 100 to about 575.

Description

Background of the invention [0001] The present invention relates to low resilience, viscoelastic foams that exhibit slower recovery after compression and methods of producing these viscoelastic foams. [0002] Isocyanate-based polymeric foams and methods of producing these foams are described in US Patent 6,790,871. These flexible isocyanate polymer foams in this patent are characterized by: low resilience, T g tan less than or equal to about 0°C, measured over a temperature range of about -20°C to about +60°C The variation is within about 35% of the median. These flexible, low-resilience foams are prepared from a reaction mixture comprising a urethane-forming chemical, water, and a plasticizer selected from halogenated paraffins, C 2 / C 4 Aliphatic polymers and their mixtures. [0003] EP 1457508 discloses flexible polyurethane foams exhibiting low resiliency and processes for producing these polyurethane foams. These flexible foams are characterized by a core resilien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/32C08G18/48C08G18/66C08G18/76C08G65/26
CPCC08G18/4841C08G2101/0008C08G2101/0058C08G2350/00C08G2101/005C08G18/632C08G65/2612C08G65/2663C08G18/4812C08G2101/0083C08G18/4866C08G18/4072C08G2110/0008C08G2110/005C08G2110/0058C08G2110/0083C08G18/32C08G18/48C08G2101/00C08J9/22
Inventor S·L·哈格K·W·海德M·N·摩尔D·G·戴V·吉夫登
Owner BAYER MATERIALSCIENCE AG