1. A production process of a beverage comprising a dried green tea polyphenol, said process comprising:
subjecting green tea leaves to a first extraction with water having a temperature of \u22125\xb0 C. to 8\xb0 C.,
separating and removing a first extraction solution obtained by the first extraction,
subjecting residual green tea leaves from the first extraction to a second extraction with warm water of 50\xb0 C. or higher,
drying a second extraction solution obtained from the second extraction to obtain the dried green tea polyphenol, and
mixing the dried green tea polyphenol with a beverage to produce the beverage comprising a dried green tea polyphenol,
with the proviso that the beverage comprising a dried green tea polyphenol does not comprise the first extraction solution or an extract of the first extraction solution.
2. The production process according to claim 1, wherein from 45 to 65 wt. % of non-polymer catechins of the dried green tea polyphenol consist of gallate esters of catechins.
3. The production process according to claim 1, wherein the drying is freeze drying.
4. A beverage comprising a dried green tea polyphenol obtained by the process according to claim 1.
5. A semi-fermented tea beverage or fermented tea beverage comprising a dried green tea polyphenol obtained by the process according to claim 1.
6. A beverage comprising:
(A) a polyphenol solution obtained by a first extraction of green tea leaves with water having a temperature of \u22125\xb0 C. to 8\xb0 C., and then a second extraction of residual green tea leaves from the first extraction with warm water of 50\xb0 C. or higher, and
(B) a semi-fermented tea extract or fermented tea extract,
with the proviso that the beverage does not comprise a first extract solution obtained by the first extraction or an extract of the first extraction solution.
7. The beverage according to claim 6, which contains from 0.092 to 0.5 wt. % of non-polymer catechins.
8. The beverage according to claim 7, wherein from 45 to 65 wt. % of the non-polymer catechins consist of gallate esters of catechins.
9. The beverage according to claim 6, wherein the semi-fermented tea extract or fermented tea extract is oolong tea or black tea.
10. A beverage comprising a dried green tea polyphenol obtained by the process according to claim 2.
11. A beverage comprising a dried green tea polyphenol obtained by the process according to claim 3.
12. A semi-fermented tea beverage or fermented tea beverage comprising a dried green tea polyphenol obtained by the process according to claim 2.
13. A semi-fermented tea beverage or fermented tea beverage comprising a dried green tea polyphenol obtained by the process according to claim 3.
14. The beverage according to claim 7, wherein the semi-fermented tea extract or fermented tea extract is oolong tea or black tea.
15. The beverage according to claim 8, wherein the semi-fermented tea extract or fermented tea extract is oolong tea or black tea.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An electrical contact element having a connecting segment which is formed of a copper sheet and comprises a coating, wherein the coating comprises:
a first layer containing at least 60% by weight of tin; and
a second layer disposed between the first layer and the copper sheet and containing a copper-containing alloy, wherein the copper-containing alloy contains 40 to 80% by weight of copper and 20 to 60% by weight of zinc, wherein the combined percentage by weight of copper and zinc is at least 90%.
2. The electrical contact element according to claim 1, wherein the second layer has a thickness of 0.5 to 5 \u03bcm.
3. The electrical contact element according to claim 1, wherein the second layer consists of the copper-containing alloy.
4. The electrical contact element according to claim 1, wherein the first layer has a thickness in a range of 1 to 15 \u03bcm.
5. The electrical contact element according to claim 1, wherein the first layer contains up to 40% by weight of zinc.
6. The electrical contact element according to claim 1, wherein the coating comprises a third layer disposed between the second layer and the copper sheet, wherein the third layer contains tin.
7. The electrical contact element according to claim 6, wherein the coating comprises a fourth layer disposed on a side of the first layer opposite the second layer wherein the fourth layer contains zinc.
8. A method for manufacturing an electrical contact element, comprising the steps of:
providing a base body;
applying a second layer on the base body, wherein the second layer contains a copper-containing alloy, wherein the copper-containing alloy contains 40 to 80% by weight of copper and 20 to 60% by weight of zinc, and wherein the combined percentage by weight of copper and zinc is at least 90%; and
applying a first layer, containing at least 60% by weight of tin, on a side of the second layer opposite the base body.
9. The method according to claim 8, further comprising a step of heat treating the electrical contact element, wherein the heat treating step is performed after the step of applying the first layer.
10. The method according to claim 8, wherein the layers are each applied by a process selected from the group consisting of galvanic technique, vapor coating, sputtering, dip coating, spray coating, and any combinations of the above processes.
11. The method according to claim 8, wherein the base body is formed of a fire-tinned copper sheet.
12. The method according to claim 9, wherein the heat treating step is performed in a temperature range of 50 to 350\xb0 C. for a time period of 1 second to 48 hours.
13. The method according to claim 12, wherein the heat treating step is performed in a temperature range of 220 to 270\xb0 C. for a time period of 5 seconds to 2 minutes.