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Foams based on thermoplastic polyurethanes

a polyurethane and foam technology, applied in the field of expandable thermoplastic polyurethane, can solve the problems of high energy consumption during production and processing, disadvantage in transportation and storage of these beads, etc., and achieve the effects of reducing melting point, improving flowability, and low hardness

Pending Publication Date: 2022-01-06
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention uses a type of TPU that has lower hardness, lower melting point, and better flowability. This results in lower temperatures and pressures during production of expanded TPU beads, especially when steam is used. The softness also makes adhesive-bonding of the foam beads more effective. The preferred TPUs have a melting range below 130°C and a melt flow rate of 250 g / 10 min or smaller. The TPUs can be based on polyether alcohol or polyester alcohol and can be produced by reacting isocyanates with compounds reactive towards isocyanates and chain extenders. The technical effects of this invention include improved feel and operability at lower temperatures.

Problems solved by technology

A disadvantage of the TPU foams described in WO 94 / 20568 is the high energy consumption during production and processing.
These TPU foam beads are produced at temperatures of 150° C. and higher and in the examples have a bulk density of from 55 to 180 g / L, with resultant disadvantage in transport and storage of these beads due to the increased space required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Foam Bead Production

[0091]100 parts of the TPUs stated in Table 1 in the form of pellets each weighing about 2 mg, 250 parts by weight of water, 6.7 parts of tricalcium phosphate, and 20 parts of n-butane were introduced, with stirring, into an autoclave and heated to the temperature stated in Table 2. The contents of the pressure vessel were then discharged through a basal valve and depressurized, while the pressure in the tank was kept constant by introducing, under pressure, nitrogen or the blowing agent used. The foam beads were freed from adherent residues of auxiliaries via washing with nitric acid and water and were air-dried at 50° C.

[0092]The impregnation conditions and the resultant bulk densities of the expanded beads are found in Table 2.

TABLE 2n-ButaneTPU of[parts byTemperatureBulkTable 1weight][° C.]density [g / L]A20112300A20114170B20119240B20120190B20122140B20125120

example 2

Production of Moldings

[0093]The foam beads produced in Example 1 were charged into a preheated mold, with pressure and compaction. The mold was heated by steam at from 1.0 to 4.0 bar, i.e. at temperatures of from 100° C. to 140° C., on alternate sides.

[0094]The mold was then depressurized and cooled with water and, respectively, air, and opened, and the mechanically stable molding was removed.

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Abstract

Molded parts for automobile interiors can be made from expanded thermoplastic polyurethane beads. Processes can be used to produce the molded parts from thermoplastic polyurethane.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. application Ser. No. 15 / 837,344, filed on Dec. 11, 2017; which was a divisional application of U.S. application Ser. No. 13 / 605,673, filed on Sep. 6, 2012, issued as U.S. Pat. No. 9,884,947; which was a divisional application of U.S. application Ser. No. 12 / 161,354, filed on Jul. 18, 2008; which was the National Stage entry under § 371 of International Application No. PCT / EP2007 / 050274, filed on Jan. 12, 2007, and which claims the benefit of priority to European Application No. 06100506.2, filed on Jan. 18, 2006. The content of each of these applications is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTIONField of the Invention[0002]The invention relates to expandable thermoplastic polyurethane, preferably in bead form, comprising blowing agent, where the Shore hardness of the thermoplastic polyurethane is from A 44 to A 84, preferably from A 62 to A 82, particularly pr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08J9/16C08J9/232C08J9/18A43B13/04A43B13/18A43B17/14C08G18/48C08L75/04B29B9/06B29B9/12B29B9/14B29B9/16A43B13/02C08G18/10C08G18/76C08J3/12C08J9/14
CPCC08J9/16C08G2101/00C08J9/18A43B13/04A43B13/187A43B17/14C08G18/4854C08L75/04B29B9/065B29B9/12B29B9/14B29B9/16A43B13/023C08G18/10C08G18/48C08G18/7657C08J3/12C08J9/141C08J9/232C08G18/6674C08L75/08C08J2375/08C08J2201/03C08J2375/04C08K3/32C08G2410/00C08J2203/14
Inventor PRISSOK, FRANKBRAUN, FRANK
Owner BASF AG