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Improvements relating to polyurethanes

A polyurethane foam and polyisocyanate technology, applied in the field of polyurethane foam, can solve the problems of narrow processing window and very sensitive to small changes

Inactive Publication Date: 2017-08-29
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Unfortunately, low-index foam formulations are very sensitive to small changes in catalyst and surfactant dosage, so the processing window is undesirably narrow

Method used

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  • Improvements relating to polyurethanes
  • Improvements relating to polyurethanes

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0070] Examples of such polymer polyol systems and their preparation are disclosed, for example, in EP-A-076,491, EP-A-343,907 and EP-A-495,551. It is also known that polyurea or polyurethane polymers can be used as dispersion polymers in polymer polyols other than polymers based on ethylenically unsaturated monomers.

[0071] The polymer dispersed in the base polyol may in principle be any such polymer known to be suitable for this purpose. Accordingly, suitable polymers include polymers based on ethylenically unsaturated monomers, especially vinylaromatic hydrocarbons such as styrene, a-methylstyrene, methylstyrene and various other alkyl-substituted styrenes of polymers. Among them, styrene is preferably used. Vinyl aromatic monomers can be used alone or in combination with other ethylenically unsaturated monomers such as acrylonitrile, methacrylonitrile, vinylidene chloride, various acrylates and conjugated dienes such as 1,3-butadiene and combination with isoprene. Ho...

Embodiment 10

[0184] Example 10 (Prophetic)

[0185] Determining an amine catalyst component comprising N,N-dimethylaminoethanol instead of triethylenediamine, wherein N,N-dimethylaminoethanol provides the equivalent of 0.2-0.6 parts per 100 parts by weight of the polyol component ( pphp) gelling activity of triethylenediamine.

[0186] Referring to "Polyurethane Catalysis by Tertiary Amines" (Roger van Maris et al., Journal of Cellular Plastics, Vol. 41 - Jul. 2005, 305), especially Table 1 thereof, it was found that the gelling activity of triethylenediamine was 10.9 (×10), while the gelling activity of N,N-dimethylaminoethanol was 2.91 (×10). On this basis, the amount of N,N-dimethylaminoethanol that provides gelling activity equivalent to 0.2-0.6 parts by weight (pphp) of triethylenediamine per 100 parts by weight of the polyol component is calculated to be 0.75- 2.25 pphp.

[0187] Thus, it is contemplated that a suitable amine catalyst component could consist of 0.75-2.25 pphp dime...

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Abstract

A process for making a polyurethane foam, the process comprising combining, at an isocyanate index of at most 120: (a) a polyol component comprising, per hundred parts by weight: (i) from 10 to 70 parts by weight of a first polyol having a number average molecular weight in the range of from 2000 to 12000 Dalton, and a functionality in the range of from 2 to 6; and (ii) from 90 to 30 parts by weight of a second polyol having a number average molecular weight in the range of from 300 to 1500 Dalton, a functionality in the range of from 2 to 6, and a hydroxyl value in the range of from 100 to 600 mg KOH / g; (b) an amine catalyst component consisting of: (i) in the range of from 0.2 to 0.6 parts per hundred parts by weight of polyol component (pphp) of triethylenediamine or a delayed action form thereof, and optionally in the range of from 0.05 to 0.20 pphp bis(dimethylaminoethyl)ether or a delayed action form thereof; or (ii) an amount of one or more tertiary amines or delayed action forms thereof having a catalytic gelling and / or blowing activity equivalent to (i); and (c) foam-forming reactants comprising an aromatic polyisocyanate, to obtain the polyurethane foam.

Description

technical field [0001] The present invention relates to the preparation of polyurethane foam. In particular, but not exclusively, the invention relates to a method and a reaction system for the preparation of polyurethane foams, and the polyurethane foams obtainable therefrom. Background technique [0002] Polyurethane foams are widely used in many industrial and consumer applications. This ubiquity is due to its wide range of mechanical properties and ability to be easily fabricated. [0003] The preparation of polyurethanes by reaction of polyisocyanates (for example diisocyanates), polyols and possible additional constituents using catalysts is known. Catalysts are generally used to promote at least one of two primary reactions (and sometimes secondary crosslinking reactions), which must occur simultaneously and competitively at balanced rates to ensure stable processing and provide polyurethanes with desired physical properties. The first major reaction (commonly call...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/63C08G18/48C08G18/32C08G18/18C08G18/20C08G101/00
CPCC08G18/1833C08G18/2063C08G18/3275C08G18/4816C08G18/4829C08G18/632C08G18/6688C08G18/7621C08G2110/0058C08G2101/00C08G18/18C08G18/48C08G18/63C08G18/32C08G18/76C08J9/08C08G18/1808C08G18/4804
Inventor P·M·S·皮拉德罕M·维里沙巴多斯A·库玛P·德韩帕尔
Owner SHELL INT RES MAATSCHAPPIJ BV
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