Molded polyurethane body

a polyurethane body and molding technology, applied in the direction of flexible covers, superstructure subunits, packaging, etc., can solve the problems of insufficient ability to sterilize using superheated steam, and insufficient use of such molding materials in the interior of motor vehicles

Inactive Publication Date: 2003-08-28
MUHLFELD HORST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The resulting polyurethane exhibits improved processability, crystallization, tensile strength, and elastic properties, maintaining dimensional stability up to 150°C with enhanced resistance to heat, light, and mechanical stress, suitable for high-temperature applications and sterilization.

Problems solved by technology

However, using such polyurethane molding materials in the interior of motor vehicles is not guaranteed due to the automobile industry's increased demands on the materials used to produce dashboard coatings, according to which these materials must possess grain stability and hot-light stability of at least 130.degree. C.
Also for use as food packaging or as molded bodies for hygienic or medicinal purposes, the ability to sterilize using superheated steam is not sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

[0045] Step 1

[0046] A thermoplastic polyurethane was produced in accordance with Step 1 of Example 1.

[0047] Step 2

[0048] 100.00 parts by weight of the thermoplastic polyurethane from Step 1 are reacted with 10.00 parts by weight of a dimeric isocyanate based on isophorone diisocyanate having a uretdione structure and an isocyanate content of 16% by weight analogously to Example 1.

[0049] The following properties were established for this material: Melting point: 190.degree. C. to 195.degree. C.;

[0050] Melt index in accordance with DIN ISO 1133 under a 2.16 kg load; measured at 170.degree. C.: not measurable;

[0051] measured at 200.degree. C.: not measurable;

[0052] measured at 220.degree. C.: 65 g / 10 min;

[0053] heat aging of a molded part in 500 hours at 140.degree. C.: no change on the surface, no melting of the grain structure;

[0054] hot-light aging in 500 hours at 130.degree. C.: no discoloration, no change on the surface, no melting of the grain structure.

example 3

[0055] Step 1

[0056] A thermoplastic polyurethane was produced in accordance with Step 1 of Example 1.

[0057] Step 2

[0058] 100.00 parts by weight of the thermoplastic polyurethane from Step 1 are reacted with 3.00 parts by weight of paraformaldehyde analogously to Example 1. The following properties were established for this material:

[0059] Melting point: no longer capable of being melted;

[0060] Melt index in accordance with DIN ISO 1133 under a 2.16 kg load; measured at 170.degree. C.: not measurable;

[0061] measured at 200.degree. C.: not measurable;

[0062] measured at 220.degree. C.: not measurable;

[0063] heat aging of a molded part in 500 hours at 140.degree. C.: no change on the surface, no melting of the grain structure;

[0064] hot-light aging in 500 hours at 130.degree. C.: no discoloration, no change on the surface, no melting of the grain structure.

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Abstract

A molded polyurethane body is free of by-products capable of migrating and has high light fastness as well as improved temperature stability. The molded polyurethane body is obtainable by reacting: a) one or more aliphatic polyols having a molecular weight of 450 to 6000 g / mol and a hydroxyl value of 10 to 235; b) with aliphatic and / or cycloaliphatic diisocyanates in an equivalent ratio of diisocyanate to polyol of 1.2:1.0 to 16.0:1.0; c) with diols as chain lengthening agents having a molecular weight of 60 to 450 g / mol, the NCO index formed from the quotient, which is multiplied by 100, of the equivalent ratio of isocyanate groups to the sum of the hydroxyl groups of polyol and chain lengthening agents lying within a range of 90 to 105; and d) with an at least bifunctional reaction component, which is suitable for subsequent cross-linking and which reacts with the terminal hydroxyl groups of the polyurethane chain as well as with the acidic hydrogen atoms of the urethane groups and leads to branched-chain reactions, the thermoplastic polyurethane formed by conversion from the components a) through c) in a first step being homogenously mixed in a second step with 0.2 to 25 parts by weight of the component d) with respect to 100 parts by weight of the thermoplastic polyurethane, formed into a molded body, and subsequently cross-linked at temperatures from 80 to 240° C.

Description

[0001] The present invention relates to a molded polyurethane body having high light fastness as well as improved temperature stability.BACKGROUND INFORMATION[0002] German Published Patent Application Nos. 26 58 136 and 42 03 307 describe thermoplastic, processable molding materials are made of mixtures of different aliphatic polyols and 1,6 hexamethylene diisocyanate having chain lengthening means such as 1,4 butane diol. The polyurethane molding materials described can be used, in particular, for manufacturing food packaging, but also for manufacturing films for decorative purposes.[0003] However, using such polyurethane molding materials in the interior of motor vehicles is not guaranteed due to the automobile industry's increased demands on the materials used to produce dashboard coatings, according to which these materials must possess grain stability and hot-light stability of at least 130.degree. C.[0004] Also for use as food packaging or as molded bodies for hygienic or medi...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B29B7/10B60R13/02B65D65/02C08G18/08C08G18/65C08G18/78C08G18/79C08G18/83C08J5/00
CPCC08G18/0895C08G18/833C08G18/797C08G18/7831
InventorMUHLFELD, HORSTSCHAUBER, THOMASWAGENER, SILKE
OwnerMUHLFELD HORST