[Python] How to prevent lxml from converting '&' character to '&'?

I need to send the control characters 
 and 
 in my XML file so that the text is displayed correctly in the target system.

For the creation of the XML file I use the lxml library. This is my attempt:

from lxml import etree as et
import lxml.builder

e = lxml.builder.ElementMaker()

xml_doc = e.newOrderRequest(
e.Orders(
e.Order(
e.OrderNumber('12345'),
e.OrderID('001'),
e.Articles(
e.Article(
e.ArticleNumber('000111'),
e.ArticleName('Logitec Mouse'),
e.ArticleDescription('* 4 Buttons
* 600 DPI
* Bluetooth')
)
)
)
)
)

tree = et.ElementTree(xml_doc)
tree.write('output.xml', pretty_print=True, xml_declaration=True, encoding="utf-8")


This is the result:

<?xml version='1.0' encoding='UTF-8'?>
<newOrderRequest>
<Orders>
<Order>
<OrderNumber>12345</OrderNumber>
<OrderID>001</OrderID>
<Articles>
<Article>
<ArticleNumber>000111</ArticleNumber>
<ArticleName>Logitec Mouse</ArticleName>
<ArticleDescription>* 4 Buttons&amp;#x0D;&amp;#x0A;* 600 DPI&amp;#x0D;&amp;#x0A;* Bluetooth</ArticleDescription>
</Article>
</Articles>
</Order>
</Orders>
</newOrderRequest>


This is what I need:

<ArticleDescription>* 4 Buttons&#x0D;&#x0A;* 600 DPI&#x0D;&#x0A;* Bluetooth</ArticleDescription>


Is there a function in the lxml library to turn off the conversion or does anyone know a way to solve this problem? Thanks in advance.

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