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Fast demold/extended cream time polyurethane formulations

A polyurethane foam, polyisocyanate technology, applied in the field of polyurethane products and their production, can solve problems such as increasing incremental cost, increasing demolding time, and impairing productivity

Active Publication Date: 2007-10-24
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, catalysts that delay the onset of the polyurethane-forming reaction also tend to increase the demold time, thereby increasing incremental cost
[0004] At the same time, there is a trend towards producing polyurethane foams of lower and lower densities, which tends to increase demold times, further compromising productivity

Method used

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  • Fast demold/extended cream time polyurethane formulations
  • Fast demold/extended cream time polyurethane formulations
  • Fast demold/extended cream time polyurethane formulations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

Demolding time (minutes and seconds)

4′45″

4′00″

3′30″

3′15″

2′15″

[0031] Catalyst Composition 1 at 2.80 pphp provided the closest match to the 9 second cream of the control (TEDA at 0.5 pphp) while reducing the demold time from 4'30" to 2'45". An increase of 2 seconds in creaminess was also observed. When the demold time of the TEDA control (0.66 pphp contained TEDA) was matched by using Catalyst Composition 1 at 2.0-2.2 pphp, the cream period of 7 seconds was extended to 13-14 seconds. In commercial practice, such an improvement is expected to provide excellent model filling performance.

[0032] Table 9 illustrates the effect of removing any of several ingredients (cure accelerator, trimerization catalyst or blowing catalyst) from the preferred catalyst composition.

Catalysts and supports used

control

Have

Glycerol

comparison of

control

Have

Glycerol

comparison o...

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PUM

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Abstract

Catalyst compositions for use in forming polyurethane products include a gelling catalyst, a trimerization catalyst, and a cure accelerator. The gelling catalyst is a tertiary amine, mono(tertiary amino) urea, bis(tertiary amino) urea, or a combination of any of these. Any known trimerization catalyst may be used. The cure accelerator may be a diol having at least one primary hydroxyl group, and having from 5 to 17 chain backbone atoms chosen from carbon, oxygen, or both between the hydroxyl groups, provided that at least five of the backbone atoms are carbon. Alternatively or in addition, the cure accelerator may be a polyol having three or more hydroxyl groups, at least two of which are primary, and having molecular weights between 90 g / mole and 400 g / mole. Delayed initiation of the polyurethane-forming reaction and / or reduced demold time for producing the polyurethane part can be obtained by using these catalyst compositions.

Description

[0001] cross-reference to related applications [0001] This application is a continuation-in-part of Application Serial No. 10 / 856,042 filed May 28, 2004, which is incorporated herein by reference. technical field [0002] The present invention relates to polyurethane products and methods for their production. More specifically, it relates to catalyst compositions for use in forming polyurethane products. Background technique [0003] Manufacturers of polyurethane articles require ever-improving processing techniques to meet increasing pressures for cost-efficiency and complex part designs. Two important parameters that affect a manufacturer's ability to meet these challenges are the ability to completely and quickly fill the mold before the initiation of the urethane reaction increases viscosity, and the system cures very rapidly thereafter so that the part can be quickly removed from the mold. The abilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/18C08L75/04C08G101/00C08G18/16C08G18/32C08G18/66C08J9/00
CPCC08G2101/0008C08G18/6677C08G18/18C08G18/165C08G18/6644C08G18/3206C08G2110/0008
Inventor G·D·安德烈M·L·里斯特曼恩P·G·斯特勒伊J·D·托比亚斯J·W·米勒
Owner AIR PROD & CHEM INC