A PROCESS FOR PRODUCING A HIGH-HEAT DELIVERY DEVICE OBTAINING OR CONSISTING OF A POLYMER COMPOSITION COMPRISING A FRAGRANCE, OR A PART THEREOF

Abstract

A process for producing a heat delivery device containing or consisting of a polymer composition comprising a fragrance or part thereof comprising the steps of: a) producing a first polymer composition, by feeding a thermoplastic polyester, optionally a first thermoplastic copolyester elastomer and optionally further components of the composition to an extruder, melting and mixing the components, b) cooling down the first polymer composition and c) feeding the first polymer composition and a master batch comprising a second thermoplastic copolyester elastomer and the fragrance to an injection molding machine, melting and mixing the first polymer composition and the master batch in the injection molding machine to obtain the second polymer composition and injection molding of the so obtained molten second polymer composition into the mold of the high-heat delivery device or the part thereof.

Claims

1. A process for producing a heat delivery device containing or consisting of a polymer composition comprising a fragrance or part thereof comprising the steps of: a) producing a first polymer composition, by feeding a thermoplastic polyester, optionally a first thermoplastic copolyester elastomer and optionally further components of the composition to an extruder, melting and mixing the components of the polymer composition, b) cooling down the first polymer composition and c) feeding the first polymer composition and a master batch comprising a second thermoplastic copolyester elastomer and the fragrance to an injection molding machine, melting and mixing the first polymer composition and the master batch in the injection molding machine to obtain the second polymer composition and injection molding of the so obtained molten second polymer composition into the mold of the high-heat delivery device or the part thereof.

2. Process according to claim 1, wherein the thermoplastic polyester is polyethylene terephthalate.

3. Process according to claim 1, wherein the second thermoplastic copolyester elastomer has a melting point of between 150 and 180 C.

4. Process according to claim 1, wherein the second thermoplastic copolyester elastomer has a melting point of between 155 and 175 C.

5. Process according to claim 3, wherein the thermoplastic copolyester elastomer comprises a third monomer in the polyester hard block.

6. Process according to claim 5, wherein the third monomer is iso-phthalic acid.

7. Process according to claim 1, wherein the process comprises the step b1) granulating the first polymer composition before, during or after cooling down.

8. High heat delivery device or part thereof obtainable with the process according to claim 1.

Description

[0045] The invention is illustrated by the following figures.

[0046] FIG. 1: high-heat delivery device ((A)+(B)) in schematic transverse view, comprising a part (B) being produced according to the process of the present invention.

[0047] FIG. 2: high-heat delivery device of FIG. 1, but now in schematic top view.

[0048] The high heat delivery device comprising the part (A) and (B) may be produced by over-molding or by two-K injection molding.

[0049] The invention is further illustrated by examples and comparative experiments.

Materials Used

[0050] Amite BAGA 5018 of DSM, polyethyleneterephthalate, Tm=254 C., delivered by DSM. [0051] PBT-Eco=polybutyleneterephthalate-co-dimerfattyacid 20% dimer fatty acid of DSM, Tm=210 C. [0052] Arnitel3106, block copolymer, comprising hard blocks polybutylene terephthalate, comprising isothalate comonomers and soft blocks of polyehtelene oxide-polpropylene oxide-polyethylene oxide, Tm=165 C., delivered by DSM. [0053] Akulon S222, PA6,6, delivered by DSM the Netherlands. [0054] Oil: a mixture of natural and synthetic oils. [0055] Floral rose 194, a fragrance. [0056] Masterbatch Floral Rose 5222603, comprising 80 wt. % polyethylene and 20 wt. % Floral rose 194.

Measurements

DSC Melting Point of the Thermoplastic Copolyester Elastomer.

[0057] The melting temperature Tm is the peak temperature of the endothermic melting peak measured in step [5] by DSC by the method according to ISO 11357-1/3 (2011) with a scan rate of 10 C./min, which includes the following steps: A sample is first heated in a conventional differential scanning calorimeter (DSC) with a heating rate of 10 C./min in which a first melting temperature [Tm1] is defined, herein understood as the peak temperature of the highest endothermic melting peak. The instrument is purged with dry nitrogen gas with a purge flow 50 ml/min. In order to measure the melting temperature of the polyester, Tm, the following standard temperature program is applied:

[1] Heat from 20 C. to Tm1+20 C. at a scan rate of 10 C./min; purge gas N2 50 ml/min
[2] Keep at Tm1+20 C. for 3 min; purge gas N2 50 ml/min
[3] Cool from Tm1+20 C. to 20 C. at a scan rate of 10 C./min; purge gas N2 50 ml/min
[4] Keep at 20 C. for 5 min; purge gas N2 50 ml/min
[5] Heat from 20 C. to Tm1+20 C. at a scan rate of 10 C./min; purge gas N2 50 ml/min.

[0058] The melting temperature Tm is defined as the peak temperature of the endothermic melting peak measured in step [5] by DSC by the method according to ISO 11357-1/3 (2011) with a scan rate of 10 C./min.

Overmolding Process Stability

[0059] During the overmolding of parts(B) the injection pressure was measured of several successive shots. The fluctuations in the injection pressure is taken as a measure of the overmolding stability of part (B). [0060] Very good: hardly any difference in pressure. [0061] Good: small fluctuations, but parts of equal quality are obtained. [0062] Not good: fluctuations to large.
Odour Duration: Amount of Cycles that High-Heat Delivery Devise can be Used

[0063] The high-heat delivery devices were pushed at each other by closing the hair ironing machine. In this way the machine was kept for 10 minutes at 220 C. After that an expert smelled the odour of the fragrance. This was repeated until the expert decided that the odour has become too weak. The result is indicated in amount of times that the device could be used.

Oil Release

[0064] A protein Saver Card (width 25 mm), Whatman GE Healthcare Bio-science corp. was placed between a pair of heat delivery devices in a hair straightener and kept in that position for 10 minutes at 200 C. The amount of oil that was sucked into the protein saver card was determined.

Preparation of the First Polymer Composition

[0065] 80 parts by weight of Amite BAGA 5018 and 20 parts by weight of PBT-Eco were fed to a feed opening of a twin screw extruder ZSK30/44D and were molten and mixed in the extruder. An oil mixture was injected in the melting zone. The hot polymer composition string was cooled in a water bath or cooling belt and cut into granules suitable for injection molding.

Preparation of the Masterbatch

[0066] Masterbatch was produced by feeding granulate of Arnitel 3106 to the extruder Berstorff ZE25/52 R. Fragrance is introduced via liquid dosing equipment into the mixing zone of the extruder. The output was 10 kg/hr. The extruder was provided with underwater granulator. The following master batches were prepared: [0067] Masterbatch 1: 90 wt % Arnitel 3106/10 wt % Floral Rose 194 [0068] Masterbatch 2: 80 wt % Arnitel 3106/20 wt % Floral Rose 194

Injection Mouding of the High Heat Delivery Device

[0069] Parts (A) were injection molded from Akulon S222 using an Arburg Allround injection molding machine. The size of parts (A) was about 90252 mm. Thereafter the parts (A) were placed in a mold of the same injection molding machine and parts (B) were produced in the opening of part (A) by overmolding. The size of part (B) is about 7550.7 mm.

EXAMPLE 1

[0070] Part (A) was produced as described above. Part (B) was produced by feeding 4 wt % of Masterbatch 1 and 96 wt. % of the first polymer composition to the feed opening of the Arburg injection molding machine.

[0071] The so obtained high heating device was placed on a hair straightening device and tested. The results are given in table. 1.

EXAMPLE 2

[0072] As example 1, but 6 wt. % of Masterbatch 1 was used. For the results see table 1 and 2.

EXAMPLE 3

[0073] As example 1, but 3 wt. % of Masterbatch 2 was used.

COMPARATIVE EXPERIMENT A

[0074] No masterbatch was used, but 0.4 wt. % of the fragrance Floral Rose 194 was directed dosed with the further components in the feed opening of the extruder during the production of the first polymer composition. The results are given in table 1.

COMPARATIVE EXPERIMENT B

[0075] As comparative experiment A, however the fragrance was injected in the melting zone of the injection molding machine. The results are given in table 1.

COMPARATIVE EXPERIMENT C

[0076] As example 1, however no masterbatch or fragrance in any other way was used. The results are given in table 2.

COMPARATIVE EXAMPLE D

[0077] As example 1, however 1 wt % of Masterbatch Floral Rose 5222603 was used. The results are given in tables 1 and 2.

COMPARATIVE E

[0078] As comparative experiment D, however 2 wt. % of the Masterbatch Floral Rose 5222603 was used. The results are given in table 2.

TABLE-US-00001 TABLE 1 Exam- Exam- Exam- Comp. Comp. Comp. Fragrance ple 1 ple 2 ple 3 exp. A exp. B exp. D Type of Master Master Master liquid liquid granular dosing batch batch batch Floral rose 0.4 0.6 0.6 0.4 0.4 0.2 conc. [wt. %] Tests Overmoldi Very Very Very N.A. Good Not good. process good good good stability Odour 6 7 7-8 N.A. 6 3-4 duration (times) Odour initial OK OK OK Not OK OK OK Oil release OK OK OK NA Not OK from part B N.A. = not analysed

TABLE-US-00002 TABLE 2 Oil release Concentration of fragrance additive Oil release Sample [wt %] [mg/sleeve pair] Comp. Exp. C 0 0.45 Example 2 0.6 0.27 Comp. Exp. D 0.2 0.27 Comp. exp. E 0.4 0.20

[0079] For a the good odour performance (intensity/duration) optimal fragrance concentration has turned out to be 0.4-0.6%. From table 2 it is clear that the oil release is reduced when fragrance is used in the polymer composition. However for comparative experiments D and E this reduction is much more significant than for example 2 according to the invention.