HIGH-HEAT DELIVERY DEVICE

Abstract

The present invention relates to a High-heat-delivery device suitable for use in an hair straightener, a hair curling iron or an ironing apparatus and suitable for heat transfer to a substrate by direct contact with said substrate, comprising at least one element (A) having a heat transfer contact surface area, wherein the element (A) comprises a thermo-conductive thermoplastic polymer composition comprising: 30 to 89 wt % of a polyester with a Tm of at least 170 C. as measured according to ISO 11357-1/3 (2011) with a scan rate of 10 C./min; and 10 to 50 wt % of glass fibers; and 1 to 40 wt % of a thermo-conductive additive, wherein the weight percentages are based on the total weight of thermo-conductive thermoplastic polymer composition of element (A).

Claims

1. High-heat-delivery device suitable for use in an hair straightener, a hair curling iron or an ironing apparatus and suitable for heat transfer to a substrate by direct contact with said substrate, comprising at least one element (A) having a heat transfer contact surface area, wherein the element (A) comprises a thermo-conductive thermoplastic polymer composition comprising: 30 to 89 wt % of a polyester with a Tm of at least 170 C. as measured according to ISO 11357-1/3 (2011) with a scan rate of 10 C./min; and 10 to 50 wt % of glass fibers; and 1 to 40 wt % of a thermo-conductive additive, wherein the weight percentages are based on the total weight of thermo-conductive thermoplastic polymer composition of element (A).

2. Device according to claim 1, wherein the device further comprises at least one element (B) having a heat transfer contact surface, wherein element (B) comprises a thermoplastic polymer composition comprising a polymer and at least one thermo-releasable substance.

3. Device according to claim 2, wherein the thermoplastic polymer composition of element (B) comprises a thermo-conductive additive.

4. Device according to claim 1, wherein element (A) comprises at least one thermo-releasable substance.

5. Device according to claim 2, wherein element (B) is partially embedded in element (A).

6. Device according to claim 2, wherein the thermoplastic polymer composition of element (B) comprises a thermoplastic polymer selected from the group consisting of polyamides, polyesters, polyphenylene sulphides, polyphenylene oxides, polysulfones, polyarylates, polyimides, polyetheretherketones and polyetherimides, and mixtures thereof and copolymers thereof.

7. Device according to claim 2, wherein the heat transfer contact surface area of element (A) constitutes 20-80% of the combined heat transfer contact surface areas of (A) and (B) and element (B) constitutes 80-20% of the combined heat transfer contact surface areas of (A) and (B).

8. Device according to claim 1, wherein the thickness of element (A) and optionally element (B) is is 0.5 mm to 2.0 mm.

9. Device according to claim 1, wherein the through-plane conductivity of element (A) and/or the through-plane conductivity of element (B) is in the range 0.3 to 2.5 W/m K at 200 C.

10. Device according to claim 1, wherein at least one of element (A) and/or (B) comprises a thermo-conductive additive selected from the group consisting of graphite, expanded graphite, carbon black and boron nitride.

11. Device according to claim 1, wherein the thermo-conductive thermoplastic polymer composition of element (A) comprises (i) 40 to 80 wt. % of polyesterterephtalate; and (ii) 15 to 40 wt % glass fibers; and (ii) 3 to 20 wt. % of a thermo-conductive additive, wherein the weight percentage is with respect to the total weight of thermo-conductive thermoplastic polymer composition of element (A).

12. Device according to claim 2, wherein the thermoplastic polymer composition of element (B) comprises (i) 30-85 wt. % of a polymer; and (ii) 5-50 wt. % of a thermo-conductive additive and (iii) 1-25 wt. % of a thermo-releasable substance wherein the weight percentage is with respect to the total weight of thermoplastic polymer composition of element (B).

13. Device according to claim 2, wherein the thermo-releasable substance comprises a fragrance and/or an oil selected from the group consisting of argan oil, avocado oil, sunflower oil, jojoba oil and camealia oil, and mixtures thereof.

14. Device according to claim 2, wherein the thermoplastic polymer composition in of (B) comprises a polyester.

15. Device according to claim 1, wherein elements (A) and/or (B) are injection moulded parts.

16. Method for releasing thermo-releasable substance from a composition as defined in claim 2, comprising heating the thermo-conductive composition and thereby releasing said thermo-releasable substance.

17. Hair styling apparatus comprising the high heat delivery device according to claim 1.

18. Ironing apparatus comprising the high heat delivery device according to claim 1.

Description

[0095] The invention is illustrated by the following figures. The invention is further illustrated by examples and comparative experiments.

[0096] FIG. 1: high-heat delivery device (transverse view) according to the present invention comprising an element (A) and an element (B) as defined herewith

[0097] FIG. 2: high-heat delivery device (top view) according to the present invention comprising an element (A) and an element (B) as defined herewith

EXAMPLES

Materials Used:

[0098] Polymers: [0099] PA-6=polyamide-6=Akulon K125 or Akulon K122 of DSM [0100] PA-66=polyamide-6,6=S222 of DSM [0101] PA-46=polyamide-4,6=KS200 of DSM [0102] PA-4,10=polyamide-4,10=EcoPaxx Q150MS of DSM [0103] SPS=Syndiotactic Polystyrene (Idemitsu Chemicals Europe, Xarec 90ZC, Xarec 300ZC, Xarec 142ZE) [0104] PET (5018)=polyethyleneterephthalate=Amite BAGA 5018 of DSM, Tm=254 C. [0105] PBT-Eco=polybutyleneterephthalate-co-dimerfattyacid 20% DFA of DSM (Melt volume rate=3), Tm=210 C. [0106] PBT-Eco-2=polybutyleneterephthalate-co-dimerfattyacid 20% DFA of DSM (Melt volume rate=25), Tm=209 C. [0107] PBT-Eco-3=polybutyleneterephthalate-co-dimerfattyacid 40% DFA of DSM (Melt volume rate=40), Tm=180 C. [0108] PBT-E=polybutyleneterephthalate-co-polytetramethyleneoxide=Arnitel EL740 (Melt volume rate=15), Tm=221 C. [0109] PBT=polybutyleneterephthalate, Tm=225 C. [0110] PBN-D=polybutylenenaphthanate-co-dimerfattyacid amide=experimental product of DSM [0111] Comp=Compatibilizer for PA with SPS: acid modified poly(phenylene ether) CX-1, FA-PPE (Idemitsu Kosan Co., Ltd)

Thermo-Conductive Additives

[0112] Expanded Graphite (C-Therm 01) [0113] Expanded Graphite (Ecophit GFG1200) [0114] Carbon black (Timcal Ensaco260G) [0115] Boron Nitride

Oils:

[0116] Argan Oil=product code 50 3808 1 of DSM Nutritional Products [0117] Avocado oil=Persea Gratissima oil, Avoaodo oil RBD, code 266554 of IMCD [0118] Sunflower oil=product code 1665N of Volatile [0119] Camealia Oleifera Seed Oil=Cropure Yuchayu-LQ-(JP), product code SV70391 of [0120] Croda Jojoba oil=Simmondsia Chenensis Seed Oil=Cropure Jojoba of Croda

Other Additives:

[0121] Irganox-1076=stabilizer Irganox1076 of Ciba (BASF) [0122] Irganox-1098=stabilizer Irganox 1098 of Ciba (BASF) [0123] Irganox-B1171=stabilizer Irganox B1171 of Ciba (BASF) [0124] Glass=3B CS173-x11 of Owens Corning [0125] HP 3786=Glass fibers of PPG Fiber Glass, average fiber diameter 10 micrometer. [0126] Licolub WE40=ester of montanic acids; mold release agent (Clariant) [0127] Table 1 shows various compositions according to the invention for which the thermo-conductivity was measured.

Preparing Compositions

[0128] Various compositions were made according to the tables below. The compositions were compounded on twin screw extruders like ZSK30/44D at a processing temperature being at least equal to the highest of Tg or Tm of the polymer of the composition. After the mixing the hot polymer composition string was cooled in a water bath or cooling belt and cut into granules suitable for injection molding.

Injection Molding

[0129] Injection molding was performed at an Engel 110, a machine with 110 ton maximum clamping force with a screw diameter of 30 mm. On this machine 1201201 mm plates were produced of almost all compositions using plate 1201201 mm, for some materials also mechanical test bars were produced on the Engel 110, for these test bars plate ISO 527-1A pr.80*10*4 2v. was used. From the plates plaques were cut to determine the release of the thermo-releasable substance from the composition when used on the straightener. Test bars (dog-bone) were used to produce stress-strain curves of various compositions. Tensile modulus was determined at 23 C. and 200 C. and 5 mm/min according to ISO 527; the dried granulate of the thermoplastic material of the different elements of the device was tested after injection moulding to form the test bars for the tensile tests having a thickness of 4 mm conforming to ISO 527 type 1A.

Hair Temperature Measurements

[0130] A high-heat-delivery device being a hair straightener, comprising at least one element (A) according to the invention was tested on human hair to measure the heat transfer to the hair as compared to a comparative straightener with aluminum plates.

[0131] The application temperature for both straightener was 200 C. The measured temperatures on the hair immediately after applying the straightener and after a stroke of about 20 cm on the hair was measured for severl strokes and is given in table 3.

[0132] The straightener, listed in table 3, was heated to 200 C. Human hair swatches were used as test material being 1.5 cm wide, 23 cm free length held together with by a glued part which was not pulled through the straightener (Klebetresse dicht aus Euro-Natur-Haar, remis, Farbe 6/0, Kerling International Haarfabrik GmbH, item number 826500). A stroke is defined as pulling the hair swatch through the straightener in approximately 10 seconds per pull. A test method has been performed to measure hair temperature after straightening of the hair with straightener with aluminum plates (without sleeves; comparative example in Table 3) in comparison to the straightener with 2 plastic sleeves mounted on aluminum plates. The sleeves, each having a thickness of 1.5 mm were prepared by overmolding two compositions: element A having the composition as described in Example 3 of Table 1 and Element B having the composition A of Table 2. Hair was treated with a number of strokes as given in Table 3. The temperature of the hair was recorded at the beginning of a stroke and at the end in order to measure heat transfer.

TABLE-US-00001 TABLE 1 Compositions for element (A) Tensile Thermo- Thermal modulus Tensile conductive Glass Additive conductivity at room modulus at Experi- polymer additive fiber mix at 200 C. temperature 200 C. ment no [wt %] [wt %] 1 [wt %] [wt %] [W/(m*K)] [MPa] [MPa] 1 PET(5018) 57.1 C-therm 01 7.5 35 2 0.4 1.07 15431 4593 2 PET(5018) 59.7 C-therm 01 9.9 30 2 0.4 1.22 14905 4716 3 PET(5018) 59.7 C-therm 01 4.9 35 2 0.4 0.83 14911 4676 4 PET(5018) 65.8 C-therm 01 7.5 25 2 0.4 Similar to exp 1* 12704 4098 5 PET(5018) 71.4 C-therm 01 9.9 33 2 0.4 Similar to exp 2* 10747 3167 1 thermo-conductive additive is added as masterbatch PET (5018) 70 wt % and thermo- conductive additive 30 wt %, with respect to the masterbatch; 2 0.3 wt % LicolubWE40, 0.1 wt % Sodium benzoate *Not measured, conductivity estimated based on the amount of thermo- conductive additive

TABLE-US-00002 TABLE 2 Compositions suitable for element (B) Conduc- Conduc- Thermo- tivity tivity polymer polymer conductive Other additive @ 25 @ 200 Experi- type type oil type additive Glass Additive Irganox C. [W/ C. [W/ ment no [wt %] [wt %] [wt %] [wt %] [wt %] [wt %] [wt %] (m*K] (m*K] A PET 43.24 PBT- 30.63 mix 1 5.41 C-Therm- 20.00 1076 0.72 0.97 1.03 BAGA Eco 001 B PET 40.84 PBT- 34.71 Avocado 6.13 C-Therm- 17.50 1076 0.82 0.67 0.68 BAGA Eco 001 (MB) C PET 54.70 PBT- 22.10 Avocado 7.36 C-Therm- 15.00 1076 0.84 0.51 0.50 BAGA Eco3 001 (MB) PBT- Eco2 50/50 D PET 50.50 PBT- 27.77 Avocado 5.89 C-Therm- 15.00 1076 0.84 0.75 0.76 BAGA Eco 001 (MB) E PA- 38.94 SPS 23.80 Argan 9.38 Ecophit 14.25 10 Comp 2.16 B1171 0.72 0.63 0.59 4,10 Xarec GFG1200 142ZE Timcal 0.75 ensaco260 F PA- 36.35 SPS 22.21 Argan 8.75 Boron 20.00 10 Comp 2.02 B1171 0.67 0.45 0.40 4,10 Xarec Nitride 142ZE G PA- 38.94 SPS 23.80 Argan 9.38 Ecophit 15.00 10 Comp 2.16 B1171 0.72 0.54 0.50 4,10 Xarec GFG1200 142ZE H PBT 53.47 PBT- 30.30 Argan 5.35 Ecophit 10.00 B1171 0.88 0.50 0.62 Eco2 GFG1200 mix 1 = 94/2, 5/2, 5/1 Avocado/Argan/Camelia/Vitamine-E

TABLE-US-00003 TABLE 3 Experiments on hair to measure heat transfer Example according to the invention Straightener according to the Comparative invention comprising two sleeves example made from element A: example 3 Straightener with from the table 1 and element aluminum plates B: example A from Table 2 Application 200 C. 200 C. temperature of the straightener Measured hair 155 C. 143 C. temperature 1.sup.st stroke beginning Measured hair 122 C. 109 C. temperature 1.sup.st stroke at the end Measured 150 C. 140 C. temperature 2.sup.nd stroke beginning Measured hair 132 C. 120 C. temperature 2nd stroke at the end Measured hair 155 C. 145 C. temperature 3.sup.rd stroke beginning Measured hair 137 C. 125 C. temperature 3.sup.rd stroke at the end
Table 1 shows compositions suitable for element (A) and Table 2 show compositions suitable for element (B) of the high-heat delivery device according to the invention; Comparative examples C_1 to C_3 exhibit less thermo-conductivity due to the absence of thermo-conductive additive.

[0133] The results of Table 3 clearly indicate that the hair straightener according to the invention can effectively transfer heat to hair, in a way almost similar to aluminium which is known to be of much better conductance as compared to a polyester composition according to the invention. Surprisingly, the hair straightener according to the invention showed very good straightening properties. A measure of straightening of hair is reflected by hair temperature after use of a straightener device and generally may be at least 120 C. to create proper straightening performance. Results are compared for the straightener without plastic sleeves and with sleeves comprising element A and B. Surprisingly, the straightener according to the invention was able to transfer heat in a way almost similar to a hair straightener with aluminum contact surface.