Polyurethane-based polymer composition

Patent metadata

Field	Value
Publication number	US-9499652-B2
Application number	US-201414778931-A
Country	US
Kind code	B2
Filing date	Mar 20, 2014
Priority date	Mar 20, 2013
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A polymer composition comprising at least one thermoplastic polyurethane (TPU) with a Vicat softening point (in accordance with ISO 306/A50) below 80° C. and from 5 to 95% by weight of at least one polymer obtainable via free-radical polymerization, based on the entirety of TPU and of the polymer obtainable via free-radical polymerization, where the polymer obtainable via free-radical polymerization has been bonded in the form of comb polymer, graft polymer, or copolymer to the TPU, is particularly suitable for injection-molding applications.

First claim

The invention claimed is:

1. A comb polymer comprising a thermoplastic polyurethane (TPU) component with a Vicat softening point, measured in accordance with ISO 306/A50, below 80° C., and from 5 to 95% by weight of at least one polymer component based on the entirety of the TPU component and of the polymer component, where the comb polymer is obtained via a free-radical polymerization of free-radically polymerizable monomers to form the polymer component in the presence of the TPU component, and wherein the TPU component comprises functional groups onto which the free-radically polymerizable monomers are bonded during the free-radical polymerization to form the comb polymer.

2. The comb polymer according to claim 1 , where the polymer component comprises polymerized units of styrene.

3. The comb polymer according to claim 1 , where the polymer component is polystyrene.

4. The comb polymer according to claim 1 , where the Vicat softening point of the TPU component is in a range from 60 to 75° C.

5. The comb polymer according to claim 1 , where a Shore hardness of the TPU component is in a range from 50 to 100, measured in accordance with DIN 53505.

6. The comb polymer according to claim 1 , where a glass transition temperature of the TPU component is in a range from −20 to −60° C., measured in accordance with ISO 11357/-1/-2.

7. The comb polymer according to claim 1 , where the TPU component comprises, in reacted form, at least one diisocyanate component selected from the group consisting of diphenylmethane 4,4′-diisocyanate, diphenylmethane 2,4′-diisocyanate, and diphenylmethane 2,2′-diisocyanate.

8. The comb polymer according to claim 1 , where the TPU component comprises, in reacted form, diphenylmethane 4,4′-diisocyanate, one or more polytetrahydrofurans, and 1,4-butanediol.

9. The comb polymer according to claim 8 , where the TPU component comprises at lease one of Polytetrahydrofuran 1000 and Polytetrahydrofuran 2000.

10. A process for producing a comb polymer, comprising:
a) dispersing one or more TPUs with a Vicat softening point below 80° C., from 5 to 95% by weight of one or more free-radically polymerizable monomers, based on the entirety of TPU and of the monomers mentioned, a polymerization initiator, a dispersing agent, and optionally other additional substances and/or polymerization aids, in an aqueous medium at a temperature at which no substantial polymerization of the free-radically polymerizable monomers takes place, wherein the TPU comprises functional groups,
b) optionally stirring the resultant dispersion for from one to 24 h at a temperature at which no substantial polymerization of the monomers takes place, and
c) polymerizing the free-radically polymerizable monomers with the functional groups of the TPU to form the comb polymer by free-radically polymerizing the free-radically polymerizable monomers onto functional groups of the TPU.

11. A process for producing a comb polymer, comprising:
a) dissolving one or more TPUs having a Vicat softening point below 80° C. and optionally other additional substances and/or polymerization aids, in a solvent, wherein the TPU comprises functional groups, which under conditions of a radical polymerization form a comb polymer structure, when radically polymerized with vinylically unsaturated monomers;
b) heating the solution to a polymerization temperature, and
c) introducing from 5 to 95% by weight of one or more vinylically unsaturated monomers to the heated solution, wherein the vinylically unsaturated monomers are polymerized with the functional groups of the TPU by a free-radical route, wherein % by weight is based on the entirety of TPU and of the vinylically unsaturated monomer(s), and one or more polymerization initiators.

12. The process according to claim 10 , wherein the polymerization is carried out in the presence of a brominated organic and/or phosphorus-containing flame retardant and/or an organic peroxide.

13. The process according to claim 10 , wherein the polymerization is carried out in the presence of a crosslinking agent.

14. The process according to claim 10 , where the polymerization is carried out at a polymerization temperature of from 80 to 140° C.

15. The process according to claim 10 , further comprising:
swelling the TPU in a solution comprising the vinylically unsaturated monomers, the polymerization initiator, and also optionally the auxiliaries and additional substances, below the polymerization temperature, and the polymerization temperature is above the temperature at which the swelling is carried out.

16. The process according to claim 15 , where the polymerization takes place at from 110 to 140° C. and the swelling takes place at from 10 to 60° C.

17. The process according to claim 10 , wherein an aqueous phase comprises a Pickering stabilizer in combination with a surfactant and/or a protective colloid.

18. A molding obtained via injection molding of the comb polymer according to claim 1 .

19. A cable insulation, drag cable, pneumatic hose, spiral hose, toothed belt, conveying hose, or hydraulic hose comprising the molding according to claim 18 .

20. The process according to claim 11 , wherein the polymerization is carried out in the presence of a brominated organic and/or phosphorus-containing flame retardant and/or an organic peroxide.

21. The process according to claim 11 , wherein the polymerization is carried out in the presence of a crosslinking agent.

22. The process according to claim 11 , where the polymerization is carried out at a polymerization temperature of from 80 to 140° C.

23. A comb polymer, comprising:
a thermoplastic polyurethane (TPU) with a Vicat softening point, measured in accordance with ISO 306/A50, below 80° C., and
from 5 to 95% by weight of at least one polymer component based on the entire weight of the TPU and the polymer component,
wherein the comb polymer is obtained via a free-radical polymerization of one or more vinylically unsaturated monomers in the presence of the TPU,
wherein the polymer component comprises reacted units of the one or more vinylically unsaturated monomers and the polymer component is bonded to the TPU by functional groups on the TPU by the free-radical polymerization of the vinylically unsaturated monomers in the presence of the TPU, and
wherein the TPU comprises, in reacted form, units of at least one diisocyanate selected from the group consisting of diphenylmethane 4,4′-diisocyanate, diphenylmethane 2,4′-diisocyanate and diphenylmethane 2,2′-diisocyanate.

Assignees

• Basf Se

Inventors

• Spies Patrick
• Braun Frank
• Prissok Frank

Classifications

• C08K5/0066

  Flame-proofing or flame-retarding additives · CPC title

• C08K5/02

  Halogenated hydrocarbons {(C08K5/0091 takes precedence)} · CPC title

• C08F283/006 Primary

  on to polymers provided for in C08G18/00 (C08F283/004 takes precedence) · CPC title

• C08L75/04

  Polyurethanes · CPC title

• C08K3/016

  Flame-proofing or flame-retarding additives · CPC title