High moisture vapor transmission hot mele moisture cure polyurethane adhesive with exellent hydrolysis resistance

A moisture-curing, polyurethane technology, applied in the direction of adhesive products, chemical instruments and methods, synthetic resin layered products, etc., can solve problems such as uninstructed and unsuggested moisture vapor permeability

Inactive Publication Date: 2002-03-20
HB FULLER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Werner et al. do not teach nor suggest how to combine specific crystalline polyester polyols with specific polyether polyols to obtain fast-setting hot-melt moisture-curable compositions with high moisture vapor transmission rates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The reactor was charged with about 180 g Polyol 1 (45 wt%), 64.0 g Dynacoll® 7371 (a crystalline polyester polyol from Huls America) (16.0 wt%), 60.0 g (15.0 wt%) with an OH value of 260 polypropylene glycol, 1.80 g Irganox® 1010 hindered phenol antioxidant (0.45 wt%), 0.12 g 85% phosphoric acid (0.03 wt%) and 0.08 g Modaflow® resin modifier / defoamer (0.02 wt%). The solids were then melted and dried under vacuum at about 215°F (about 100°C) for 1 hour. The temperature was reduced to about 160°F (about 70°C), the vacuum was released, and 94.0 g of Isonate(R) 2125M isocyanate (23.5 wt %) was added. The reaction was carried out under vacuum at 190°F (about 88°C) for about 2 hours. The resulting product was then decanted from the reactor and purged with nitrogen. The resulting NCO:OH ratio was 1.87.

[0087] The resulting prepolymer had a viscosity of 3055 cP at about 175°F (about 80°C).

[0088] The composition was tested for washability using Test Method 5. All lamin...

Embodiment 2

[0092] In the same manner as in Example 1, 180 g of polyol 2 (45 wt %), 64.0 g of Dynacoll® 7371 (16.0 wt %), 60.0 g of polypropylene glycol with a molecular weight of 400 g / mol, 1.80 g of Irganox ® 1010 (0.45 wt %) , 0.03 g 85% phosphoric acid, 0.08 g (0.2 wt %) Modaflow(R) resin modifier / defoamer, and 94.0 g (23.5 wt %) Isonate(R) 2125 M isocyanate. This reaction yielded a prepolymer with an NCO:OH ratio of 1.84.

[0093] The resulting prepolymer had a viscosity of 3020 cP at about 175°F (about 80°C).

[0094] The washability of this sample was determined and the laminate was still intact after two wash cycles.

[0095] The T-peel value for the unwashed laminate was about 2.7 kg / cm, with substrate breakage occurring after both the first and second wash cycles. No adhesive failure or laminate delamination was observed.

[0096] The film sample had an MVTR of about 195 g / m as measured by MVTR Method B 2 / day.

Embodiment 3

[0098] Samples were prepared as described in Example 1. The reactants were 60.0 g polyol 2 (15 wt %), 120 g of polypropylene glycol (PPG) (30 wt %) with a molecular weight of 4000 g / mol, 64 g of Dynacoll® 7371 crystalline polyester polyol (16 wt %), 60.0 g of a molecular weight of 400 g / mol mol of PPG, 1.8 g Irganox® 1010 antioxidant (0.45 wt%), 0.12 g (0.03 wt%) phosphoric acid (85%), 0.08 Modaflow® resin modifier / defoamer (0.02 wt%) and 94.0 g Isonate® 2125M Isocyanate (23.5 wt%). This example yielded an NCO:OH ratio of 1.86.

[0099] The resulting prepolymer had a viscosity of 2730 cP at about 175°F (about 80°C).

[0100] Laminates were tested according to Test Method 5. The laminate was still intact after two wash cycles. Tested for T-Peel, the substrate (but not the adhesive) failed.

[0101] Measure MVTR, at a film thickness of about 475g / m 2 In the case of , the MVTR is 115.6g / m 2 / day. The permeability coefficient is about 4. This MVTR is lower than for some o...

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Abstract

This invention relates to a hot melt moisture cure polyurethane composition which is the reaction product of a polyether polyol formed from a compound selected from the group consisting of ethylene oxide, propylene oxide, 1,2-butylene oxide, 1,4-butylene oxide and mixtures thereof; a low molecular weight polyalkylene glycol having from 3 to 7 carbon atoms; a crystalline polyester polyol having a melting point from about 40 DEG C. to about 120 DEG C.; and at least one polyfinctional isocyanate component wherein said composition has a moisture vapor transmission rate of greater than about 100 g / m2 / day film thickness of from about 450 to about 500 g / m2, and hydrolysis resistance.

Description

field of invention [0001] The present invention relates to hot-melt moisture-curing polyurethane compositions comprising the reaction of polyether diols, low molecular weight polyalkylene glycols, crystalline polyester diols and at least one polyfunctional isocyanate component having two or more -NCO groups product. The composition also optionally includes a thermoplastic component. The compositions are suitable for use as adhesives and coatings, especially where high moisture vapor transmission rates and excellent hydrolysis resistance are required. Background of the invention [0002] Water vapor permeable materials have been commercially available for a considerable time. These materials do not allow the passage of liquid water and are therefore useful when it is desired to keep the underlying article or skin dry while allowing air and water vapor to pass through the material. These water vapor permeable materials are suitable for sportswear, medical clothing, rain gea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/22B32B7/12C08G18/12C08G18/40C08G18/48
CPCC08G18/4841B32B5/22B32B7/12C08G18/4018Y10S528/905C08G2170/20C08G18/12Y10T428/264Y10T428/263Y10T428/265Y10T428/31551C08G18/307B32B2375/00B32B27/12B32B2307/724B32B2307/728B32B27/40B32B2405/00
Inventor M·B·海尔枚克
Owner HB FULLER CO
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