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US 2022/0033609 A1Published application
High-strength eTPU
AssigneeBASF SE
InventorsElmar POESELT, Peter Gutmann, Edgar Schander, Rebecca Spreen, Christiane Martina Dieckmann, Dennis Jopp
Life of this patent
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Abstract
Foamed pellets contain a thermoplastic polyurethane obtainable or obtained by reacting a polyisocyanate composition (IC), containing at least one aliphatic diisocyanate having a number-average molecular weight of less than 200 g/mol, at least one chain extender (CE1), and a polyol composition (PC). A process can be used for the production of such foamed pellets. The foamed pellets can be used for the production of a molded body.
Claims19
1-13. (canceled)
14:
- Foamed pellets, comprising a thermoplastic polyurethane obtainable or obtained by reacting at least components (i) to (iii):
- (i) a polyisocyanate composition (IC),
- (ii) at least one chain extender (CE1), and
- (iii) a polyol composition (PC),
- wherein the polyisocyanate composition (IC) comprises at least one aliphatic diisocyanate having a number-average molecular weight of less than 200 g/mol, and, if the polyisocyanate composition (IC) comprises further isocyanates, the further isocyanates are present in the polyisocyanate composition (IC) at an amount in the range from 0.1% to 20% by weight,
- wherein the chain extender (CE1) is a diamine or a diol having a molecular weight of less than 500 g/mol, and
- wherein an average diameter of beads of the foamed pellets is from 0.2 to 20 mm.
4 more elements
15:
- The foamed pellets according to claim 14, wherein the at least one aliphatic diisocyanate is a linear diisocyanate having an even number of carbon atoms.
16:
- The foamed pellets according to claim 14, wherein the at least one aliphatic diisocyanate is hexamethylene diisocyanate (HDI).
17:
- The foamed pellets according to claim 14, wherein the chain extender (CE1) is selected from the group consisting of propane-1,3-diol, ethane-1,2-diol, butane-1,4-diol, hexane-1,6-diol, and HQEE.
18:
- The foamed pellets according to claim 14, wherein the polyol composition (PC) comprises a polyol selected from the group consisting of a polyetherol, a polyesterol, a polycaprolactone polyol, and a polycarbonate polyol.
19:
- The foamed pellets according to claim 14, wherein the polyol composition (PC) comprises a polyol selected from the group consisting of a polytetrahydrofuran having a number-average molecular weight Mn in the range from 500 g/mol to 2000 g/mol.
20:
- A process for the production of foamed pellets, comprising:
- (i) providing a composition (C1) comprising a thermoplastic polyurethane, wherein the thermoplastic polyurethane is obtained or obtainable by reacting at least components (a) to (c):
- (a) a polyisocyanate composition (IC),
- (b) at least one chain extender (CE1), and
- (c) a polyol composition (PC),
- wherein the polvisocyanate composition (IC) comprises at least one aliphatic diisocyanate having a number-average molecular weight of less than 200 g/mol, and, if the polyisocyanate composition (IC) comprises further isocyanates, the further isocyanates are present in the polyisocyanate composition (IC) at an amount in the range from 0.1% to 20% by weight,
- wherein the chain extender (CE1) is a diamine or a diol having a molecular weight of less than 500 g/mol;
- (ii) impregnating the composition (C1) with a blowing agent under pressure;
- and
- (iii) expanding the composition (C1) by a pressure decrease,
- wherein an average diameter of beads of the foamed pellets is from 0.2 to 20 mm.
8 more elements
21:
- Foamed pellets, obtained or obtainable by a process according to claim 20.
22:
- A molded body, comprising the foamed pellets according to claim 21.
23:
- A method of producing the molded body according to claim 22, the method comprising:
- fusing or bonding the foamed pellets to one another.
24:
- The molded body according to claim 22, wherein the molded body is a shoe sole, a part of a shoe sole, a bicycle saddle, a cushioning, a mattress, an underlay, a grip, a protective film, or a component in automobile interiors and exteriors.
25:
- The foamed pellets according to claim 21, wherein the foamed pellets are molded into a ball, sports equipment, a floor covering, or a wall paneling.
26:
- A hybrid material, comprising a matrix composed of a polymer (PM) and the foamed pellets according to claim 21.
27:
- A molded body, comprising the foamed pellets according to claim 14.
28:
- A method of producing the molded body according to claim 27, the method comprising:
- fusing or bonding the foamed pellets to one another.
29:
- The molded body according to claim 27, wherein the molded body is a shoe sole, a part of a shoe sole, a bicycle saddle, a cushioning, a mattress, an underlay, a grip, a protective film, or a component in automobile interiors and exteriors.
30:
- The foamed pellets according to claim 14, wherein the foamed pellets are molded into a ball, sports equipment, a floor covering, or a wall paneling.
31:
- A hybrid material, comprising a matrix composed of a polymer (PM) and the foamed pellets according to claim 14.