Composition Comprising a Thermoplastic Polyisocyanate Polyaddition Product and a Flame Retardant

Abstract

A composition contains a thermoplastic polyisocyanate polyaddition product and a flame retardant, and essentially contains no melamine cyanuric acid. The polyaddition product is obtained by reacting, a substance reactive with isocyanate, a polyisocyanate, a chain extender, and is eventually in the presence of a catalyst and an additive. The flame retardant contains a phosphinate.

Claims

1: A composition, comprising: a thermoplastic polyisocyanate polyaddition product, and a flame retardant, wherein the composition does not comprise melamine cyanuric acid, wherein the thermoplastic polyisocyanate polyaddition product is obtained by reacting a. a substance reactive with isocyanate, b. a polyisocyanate, c. a chain extender, eventually in the presence of d. a catalyst, and e. an additive; and wherein the flame retardant comprises a phosphinate.

2: The composition according to claim 1, wherein the composition comprises phosphinate in an amount from 5 to 30 weight %, based on the composition.

3: The composition according to claim 1, wherein the flame retardant is a phosphinate.

4: The composition according to claim 1, wherein the phosphinate is an aluminum phosphinate.

5: The composition according to claim 1, wherein the phosphinate is an aluminum dialkyl-phosphinate.

6: The composition according to claim 5, wherein an alkyl of the phosphinate is independently selected from the group consisting of methyl-, ethyl-, propyl, butyl-, pentyl-, hexyl-, heptyl- octyl-, nonyl-, and dodecyl-.

7: The composition according to claim 1, wherein the phosphinate is aluminum diethyl phosphinate.

8: The composition according to claim 1, wherein the polyisocyanate is diphenylmethane-4,4′-diiscocyanate.

9: The composition according to claim 1, wherein the phosphinate is the only flame retardant in the composition.

10: The composition according to claim 1, wherein the substance reactive with isocyanate is a polyetherdiol.

11: The composition according to claim 10 wherein the polyetherdiol is polytetrahydrofuran or polycarbonate diol.

12: The composition according to claim 1, wherein the chain extender is selected from the group consisting of 1,3-propanediol, 1,4-butanediol, 1,5-petanediol, and 1,6-hexanediol.

13. (canceled)

14: A process, comprising: forming an article by injection molding, calenderine, powder sintering, or extruding the composition of claim 1.

15: An article, comprising the composition according to claim 1.

16: The composition according to claim 2, wherein the composition comprises the phosphinate in an amount from 10 to 15 weight %, based on the composition.

17: The composition according to claim 12, wherein the chain extender is 1,3-propanediol.

18: An article, obtained by the process according to claim 14.

Description

EXAMPLES

Example 1

[0073] The following tables list the compositions in which the individual ingredients are listed in weight proportions (GT). The compounds were each produced with a twin-screw extruder type ZE 40 A from Berstorff with a processing section length of 35 D divided into 10 housings. The pelletizing was carried out using a standard underwater pelletizer from Gala (UWG).

[0074] The compounds were extruded in a single-screw extruder type Arenz with a three-zone screw with mixing section (screw ratio 1:3) to films with a thickness of 1.6 mm. The density, Shore hardness, tensile strength, tear propagation strength, abrasion and elongation at break of the test specimens were measured. The results are summarized in the following table.

Example 2

[0075] TPU 1 with a Shore hardness of 90 A is based on Polytetrahydrofuran polyol (PTHF) with a number average molecular weight of 1000 g/mol, 1,4-butanediol und 4,4′-diisocyanatodicyclohexylmethane, commercially available as Elastollan® 1190A10 from of BASF Polyurethanes GmbH, Germany.

[0076] TPU 2 with a Shore hardness of 48 D is based on Polytetrahydrofuran polyol (PTHF) with a number average molecular weight of 1000 g/mol, 1,3-propanediol und 4,4′-diisocyanatodicyclohexylmethane, commercially available as Ellastollan® 1598A10 from of BASF Polyurethanes GmbH, Germany.

[0077] Aluminumdiethylphosphinate (ADP), CAS #: 225789-38-8 water content less than 0.2 weight %, average particle size (D50) 20-40 μm, commercially available as Exolit® OP 1230 from Clariant Produkte GmbH, Germany.

Example 3

[0078]

TABLE-US-00001 TABLE 1 This table indicates the composition of the material and its respective mechanical properties. Material A B C D TPU 1 100 90 TPU 2 100 90 ADP 10 10 Dichte [g/cm.sup.3] DIN EN ISO 1183-1, A 1, 13 1, 16 1, 15 1, 17 hardness [Shore A] [A] DIN 53505 90 95 hardness [Shore D] [D] DIN ISO 7619-1 48 50 tensil strength [MPa] DIN EN ISO 527 50 45 50 45 elongation at break [%] DIN EN ISO 527 550 490 500 460 tear resistance [kN/m] DIN ISO 34-1, B (b) 85 70 125 100 abrasion [mm].sup.3 DIN 53516 25 60 35 45

Example 4

[0079] The test pieces for the cone measurement with dimensions of 200×150×5 mm were injection molded on an Arburg 520S with a screw diameter of 30 mm. These plates were then sawn to the size required for the cone measurement (100×100×5 mm).

[0080] To evaluate the flame retardancy, a 5 mm thick specimen is tested horizontally at a radiation intensity of 35 kW/m.sup.2 in the Cone calorimeter according to ISO 5660 Part 1 and Part 2 (2002-12).

[0081] The results are summarized in Table 2. For mixture B compared to mixture A, the total heat release (THE) and peak of heat release rate (PHRR) were significantly reduced.

TABLE-US-00002 TABLE 2 A B THE 175 135 PHRR 2850 750 Time to ignition 75 80