Nucleating agent for compact thermoplastic polyurethanes

Patent metadata

Field	Value
Publication number	US-10927253-B2
Application number	US-201716078070-A
Country	US
Kind code	B2
Filing date	Feb 22, 2017
Priority date	Feb 22, 2016
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

The present invention relates to a process for producing a composition (I) at least comprising a compact thermoplastic polyurethane (P1), comprising the providing of at least one compact thermoplastic polyurethane (P1) or a reaction mixture for production of a compact thermoplastic polyurethane (R-P1), the adding of at least one compound (N) that has a conjugated, nitrogen-containing aromatic structure as nucleating agent to the at least one thermoplastic polyurethane (P1) or to the reaction mixture for production of a compact thermoplastic polyurethane (R-P1), wherein the compound (N) is a solid; and the mixing of the nucleating agent and the thermoplastic polyurethane (P1) or the reaction mixture (R-P1) to obtain a composition (I). The nucleating agent is used here in an amount in the range from 0.01% by weight to 2.0% by weight, based on the thermoplastic polyurethane (P1) or the reaction mixture (R-P1). Further relates the present composition comprising at least one compact thermoplastic polyurethane and at least one compound (N) that has a conjugated, nitrogen-containing aromatic structure as nucleating agent, wherein the compound (N) is a solid, and the use of the compounds mentioned as nucleating agents for a compact thermoplastic polyurethane.

First claim

The invention claimed is:

1. A process for producing a composition (I) comprising a compact polyurethane (P1), the process comprising:
(i) adding at least one compound (N) that has a conjugated, nitrogen-containing aromatic structure as a nucleating agent to a polyurethane (P1) or to a reaction mixture for production of a compact polyurethane (R-P1), wherein the compound (N) is a solid; and
(ii) mixing the nucleating agent and the polyurethane (P1) or the reaction mixture (R-P1) to obtain a composition (I),
wherein a total amount of nucleating agents used is in a range from 0.01% by weight to 2.0% by weight, based on the polyurethane (P1) or the reaction mixture (R-P1),
wherein the nucleating agent is at least one compound selected from the group consisting of a quinacridone, a monoazo compound, a perylene, a diketopyrrolopyrrole, an isoindoline, a phthalocyanine, and a derivative of one of these compounds.

2. The process according to claim 1 , wherein the compact polyurethane is a compact thermoplastic polyurethane.

3. The process according to claim 1 , further comprising (iii) and (iv):
(iii) heating the composition (I) to a temperature in a region of a melting range of a thermoplastic polyurethane (P1) with at least partial melting of the thermoplastic polyurethane (P1); and
(iv) cooling the composition.

4. The process according to claim 3 , wherein the composition (I) in (iii) is heated to a temperature in the region of the melting temperature of a hard phase or above the melting temperature of the hard phase of the thermoplastic polyurethane (P1).

5. The process according to claim 1 , wherein the total amount of the nucleating agents used is in a range from 0.04% by weight to 0.3% by weight, based on the polyurethane (P1) or the reaction mixture (R-P1).

6. The process according to claim 1 , wherein the nucleating agent is at least one compound selected from the group consisting of a quinacridone, a diketopyrrolopyrrole, a phthalocyanine, and a derivative of one of these compounds.

7. The process according to claim 1 , wherein the nucleating agent has been subjected to:
a treatment comprising grinding;
a treatment with a solvent, acid, alkali, bleach, crystallization or extraction;
a finishing operation to reduce or prevent flocculation or lump formation;
a finishing operation to control particle size; or
a finishing operation to regulate viscosity.

8. The process according to claim 1 , wherein the nucleating agent is used in solid form with a specific surface area in a range from 10 m 2 /g to 150 m 2 /g.

9. The process according to claim 1 , wherein the nucleating agent is used in combination with a further additive.

10. The process according to claim 9 , wherein the further additive is at least one selected from the group consisting of carbon black and a wax-based demolding agent.

Assignees

• Basf Se

Inventors

• Dabbous Raphael
• Poeselt Elmar
• Lahrmann Birte
• Bilges Guido

Classifications

• C08G18/4825 Primary

  Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title

• C08K5/34

  Heterocyclic compounds having nitrogen in the ring · CPC title

• C08L75/04 Primary

  Polyurethanes · CPC title

• C08K5/3437

  condensed with carbocyclic rings · CPC title

• C08G18/4808

  Mixtures of two or more polyetherdiols · CPC title