Breathable polyurethane hotmelt adhesive

A hot-melt adhesive and crystalline polyester technology, applied in the direction of polyurea/polyurethane adhesive, adhesive type, adhesive, etc., can solve the problems of low initial strength, difficult to determine the difference, etc., and achieve low application viscosity , short storage time, avoid delamination effect

Inactive Publication Date: 2017-08-01
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Some fabric adhesives despite showing higher viscosities (eg 20000mPa at 70°C * s), but still have a low initial strength
It is difficult to determine the difference between the various types due to the very small values ​​obtained via standard methods for determining the onset strength

Method used

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  • Breathable polyurethane hotmelt adhesive
  • Breathable polyurethane hotmelt adhesive
  • Breathable polyurethane hotmelt adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0083] The following products were used in the test

[0084]

[0085]

[0086] The hot melt adhesives according to Examples B1-B4 and Comparative Examples VB1-VB9 were prepared according to the following general preparation procedures using the parts by amounts given in Table 1 below. In Table 1, parts by weight are expressed in % by weight, based on the total weight of all starting components. When the corresponding components were not used for the preparation in the relevant test, of course no corresponding addition or corresponding step is required. The effects of catalyst amount, reaction ratio, filler amount, types of various polyols and polypropylene glycol were especially studied in the tests. Table 1 also shows the NCO / OH-ratio (NCO / OH) of the starting formulations.

[0087] General preparation process

[0088]

[0089]

[0090] Additional additives (Add), if used, can be added together with the catalyst (in the last preparation step).

[0091] The obt...

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Abstract

Described is a hotmelt adhesive comprising a polyurethane polymer obtainable from the reaction of a) polyols comprising a1) at least one liquid polyester polyol, a2) at least one amorphous polyester polyol, a3) at least one crystalline polyester polyol and a4) at least one polypropylene glycol and b) at least one polyisocyanate, and c) at least one catalyst, the starting components of the hotmelt adhesive being used in defined weight proportions, with the polyols and the at least one polyisocyanate being present in a proportion such that the NCO / OH ratio is in the range from 2.1 / 1 to 3 / 1. The hotmelt adhesive is especially suitable as a textile adhesive for bonding permeable membranes in the manufacture of breathable textiles.

Description

technical field [0001] The invention relates to the field of hotmelt adhesives and their use as textile adhesives which can be used for lamination in breathable textiles. Background technique [0002] Reactive polyurethane compositions which can be used as hotmelt adhesives (also called hotmelts) are known (PUR-RHM). They generally consist of isocyanate-terminated polyurethane prepolymers obtained by reaction of suitable polyols with excess diisocyanates. The adhesive builds up its high initial strength by cooling immediately after its application and acquires its final properties, in particular heat and environmental impact. [0003] Hot melt adhesives are used in particular as fabric adhesives for fabric lamination. Textile adhesives are applied, for example, to polyurethane films, PTFE films, heat-sensitive films or PES films by means of roller devices such as screen printing devices and melt printing devices and wide-mouth nozzles. Usually only a small amount (<10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/12C08G18/20C08G18/40C08G18/42C08G18/48C08G18/76D06M17/10C08G18/30
CPCC08G18/12C08G18/2081C08G18/4018C08G18/4202C08G18/4825C08G18/7671C08G2170/20C09J175/06C09J175/08D06M17/10C08G18/307B32B7/12B32B27/08B32B27/285B32B27/286B32B27/322B32B27/40B32B2255/10B32B2255/26B32B2307/724C09J175/04
Inventor K·帕斯克考斯基D·扬克C·阿尔特
Owner SIKA TECH AG
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