Thermoplastic elastomer based on polycondensates

A technology of thermoplastic elastomers and polycondensates, which is applied in the field of new thermoplastic elastomers to achieve good UV stability

Inactive Publication Date: 2006-12-06
DEGUSSA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this approach is limited to elastomers whose polyamide hard blocks are derived from lactams

Method used

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  • Thermoplastic elastomer based on polycondensates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of PA12 prepolymer with OH end groups

[0036] Add 25.00 g of high molecular weight PA12 to a 250 ml three-necked flask by weighing, and flush with extremely pure nitrogen. After adding 0.5 g of dimethyl adipate to block the amino end groups, the particles were melted at a metal bath temperature of 250° C. under a nitrogen atmosphere. 4.274 g of adipic acid (29.27 mmol) as a splitting agent was added to the melt with stirring and stirred for 15 minutes. The obtained number group terminated prepolymer (number average molecular weight M n 1000; 29.3 mmol) was immediately further processed in the molten state.

[0037] After cooling the melt to 180 °C, a micro-distillation column was attached to the flask. A solution of 8.80 g of glycidylphenyl ether (58.6 mmol) dissolved in 10 ml of dried N-methylpyrrolidone (NMP) was then rapidly added to the melt under stirring. The batch was stirred for an additional 2 hours, the supply of ultra pure nitrogen...

Embodiment 2

[0038] Example 2: Preparation of isocyanate-terminated PTHF prepolymer

[0039] 29.00 g (29 mmol) of dried PTHF-1000 with OH end groups were melted at 80° C. and degassed alternately by evacuation and nitrogen. Then 8.780 g of 1,6-hexamethylene diisocyanate (52.2 mmol) was rapidly added to the material while stirring at 80° C. and the reaction mixture was mixed uniformly. The temperature was then increased to 120°C. The theoretically calculated NCO concentration is reached after about 150 minutes at 120° C. under these conditions. The reaction was terminated after 3 hours; the melt of the prepolymer was used directly in Example 3.

Embodiment 3

[0040] Example 3: Kneader reaction (reaction coupling)

[0041] The chamber of the Haake laboratory kneader was heated to 200°C and the rotation speed was adjusted to 90 revolutions per minute. The melt of Example 1 and the melt of Example 2 were added successively to the kneader. Five minutes after the feed addition was complete, the chamber temperature was lowered to 150°C, the chamber was opened and the product was removed. After hardening an elastic material with thread-forming properties is obtained.

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PUM

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Abstract

The invention relates to a method for producing thermoplastic elastomers, comprising the following steps: a) providing a polycondensate which carries reactive groups selected from -NH2 and -OH, b) providing a soft component, selected from polyether and polyester, which carries isocyanate groups, c) reacting the polycondensate with the soft component in a solution or a melt. The structure and properties of these novel thermoplastic elastomers can be adjusted over a wide range. The inventive method allows to produce thermoplastic elastomers having polyester soft segments that are not producible by direct polycondensation.

Description

technical field [0001] The present invention relates to a process for the preparation of novel thermoplastic elastomers having high or low polycondensate hard segments and polyether and / or polyester soft segments. The subject of the invention is also the thermoplastic elastomer obtained by this method. Background technique [0002] Thermoplastic elastomers consisting of polycondensate hard segments and soft segments are known, for example polyetheresteramides (DE-A-2523991; DE-A-2712987), polyetheramides (DE-A-3006961) and Polyetheresters (DE-A-2213128). Such elastomers can be prepared in stirred tanks from polyamide or polyester forming monomers, chain regulators and polyether diols or polyether diamines by direct condensation reactions, or by preformed rigid and The soft block is prepared by a reaction similar to polymerization. However, these methods have the disadvantage that the polyester blocks and, to a lesser extent, the polyether blocks are not particularly therm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G65/325C08G63/685C08G69/48C08G69/44
CPCC08G18/4854C08G18/10C08G18/0895
Inventor D·勒曼
Owner DEGUSSA AG
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