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<B><P ALIGN="CENTER">UNITED STATES</P>


<P ALIGN="CENTER">SECURITIES AND EXCHANGE COMMISSION</P>


<P ALIGN="CENTER">Washington, D.C. 20549</P>


</B><P ALIGN="CENTER"></P>


<B><P ALIGN="CENTER">FORM 8-K</P>


<P ALIGN="CENTER"></P>


</B><P ALIGN="CENTER">Current Report </P>


<P ALIGN="CENTER">Pursuant to Section </P>


<P ALIGN="CENTER">3 or 15(d) of the</P>


<P ALIGN="CENTER">Securities Exchange Act of 1934</P>


<P ALIGN="CENTER"></P>


<P ALIGN="CENTER">&nbsp;</P>


<P ALIGN="CENTER">Date of Report (date of earliest event reported): December 9, 2004</P>


<P ALIGN="CENTER"></P>


<P ALIGN="CENTER">&nbsp;</P>


<B><FONT SIZE=5><P ALIGN="CENTER">LYONDELL CHEMICAL COMPANY</P>


</B></FONT><P ALIGN="CENTER">(Exact name of registrant as specified in its charter)</P>


<P ALIGN="CENTER"></P>


<B><P ALIGN="CENTER">Delaware</P>


</B><P ALIGN="CENTER">(State or other jurisdiction of incorporation)</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&#9;<B>1-10145&#9;&#9;&#9;&#9;&#9;&#9;&#9;&#9;95-4160558</P>


</B><P ALIGN="JUSTIFY">(Commission File Number)&#9;&#9;&#9;&#9;&#9;(I.R.S. Employer Identification No.)</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&nbsp;</P>


<B><P ALIGN="JUSTIFY">1221 McKinney Street, Suite 700, Houston, Texas&#9;&#9;&#9;   77010</P>


</B><P ALIGN="JUSTIFY">&#9;(Address of principal executive offices)&#9;&#9;&#9;&#9;(Zip Code)</P>


<P ALIGN="JUSTIFY"></P>


<B><P ALIGN="CENTER">(713) 652-7200</P>


</B><P ALIGN="CENTER">(Registrant's telephone number, including area code)</P>


<P ALIGN="CENTER"></P>


<B><P ALIGN="CENTER">Not Applicable</P>


</B><P ALIGN="CENTER">(Former Name or Former Address, if Changed Since Last Report)</P>


<P ALIGN="CENTER"></P>


<P ALIGN="JUSTIFY">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (<I>see </I>General Instruction A.2. below):</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&#9;<FONT FACE="Wingdings">&#111;</FONT>


&#9;Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&#9;<FONT FACE="Wingdings">&#111;</FONT>


&#9;Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&#9;<FONT FACE="Wingdings">&#111;</FONT>


&#9;Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&#9;<FONT FACE="Wingdings">&#111;</FONT>


&#9;Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</P>


<B><P ALIGN="JUSTIFY">Item 8.01&#9;Other Events</P>


</B><U><P ALIGN="JUSTIFY">&nbsp;</P>


</U><P ALIGN="JUSTIFY">Today, Lyondell Chemical Company (&quot;Lyondell&quot;) announced that its Board of Directors has elected to convert Lyondell's outstanding shares of Series B Common Stock, held solely by Occidental Petroleum (through a subsidiary), to Common Stock on December 31, 2004.<FONT FACE="Arial" SIZE=3>  </FONT>These shares will not be registered at the time of the conversion.</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">Lyondell's December 10, 2004 press release regarding this matter is filed with this Current Report on Form 8-K as Exhibit 99.1.</P>


<B><P ALIGN="JUSTIFY"></P>


<P>&nbsp;</P>


<P ALIGN="JUSTIFY">Item 9.01&#9;Financial Statements and Exhibits</P><DIR>


<DIR>





</B><P ALIGN="JUSTIFY"> (c)&#9;Exhibits</P></DIR>


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<OL>





<LI>Press Release</LI></OL>


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<P>&nbsp;</P>


<P ALIGN="JUSTIFY">&nbsp;</P>


<B><P ALIGN="CENTER">SIGNATURE</P>


</B><P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&nbsp;</P>


<P ALIGN="JUSTIFY">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&#9;&#9;&#9;&#9;&#9;&#9;&#9;LYONDELL CHEMICAL COMPANY</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&nbsp;</P>


<P ALIGN="JUSTIFY">&nbsp;</P>


<P ALIGN="JUSTIFY">&#9;&#9;&#9;&#9;&#9;&#9;&#9;By:<U>/s/ Kerry A. Galvin&#9;&#9;&#9;</P>


</U><P ALIGN="JUSTIFY">&#9;&#9;&#9;&#9;&#9;&#9;&#9;Name:&#9;Kerry A. Galvin</P>


<P ALIGN="JUSTIFY">&#9;&#9;&#9;&#9;&#9;&#9;&#9;Title:&#9;Senior Vice President, General &#9;&#9;&#9;&#9;&#9;&#9;&#9;&#9;&#9;Counsel &amp; Secretary</P>


<P ALIGN="JUSTIFY">&#9;&#9;&#9;&#9;&#9;&#9;&#9;&#9;</P>


<P ALIGN="JUSTIFY"></P>


<P ALIGN="JUSTIFY">&nbsp;</P>


<P ALIGN="JUSTIFY">Date:  December 10, 2004</P>


<FONT FACE="Arial" SIZE=1><P ALIGN="CENTER"></P>


</FONT><B><P ALIGN="CENTER">INDEX TO EXHIBITS</P>


</B><P ALIGN="CENTER"></P>


<P>Exhibit</P>


<U><P>Number</U>&#9;&#9;<U>Description</P>





</U><P ALIGN="JUSTIFY">&nbsp;</P><DIR>


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<P>99.1&#9;Press Release</P></DIR>


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{"company-data": {"conformed-name": "LYONDELL CHEMICAL CO", "cik": "0000842635", "assigned-sic": "2860", "irs-number": "954160558", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-10145", "film-number": "041196957"}, "business-address": {"street1": "1221 MCKINNEY ST", "street2": "STE 700", "city": "HOUSTON", "state": "TX", "zip": "77010", "phone": "7136527200"}, "mail-address": {"street1": "1221 MCKINNEY ST", "street2": "SUITE 700", "city": "HOUSTON", "state": "TX", "zip": "77010"}, "former-company": {"former-conformed-name": "LYONDELL PETROCHEMICAL CO", "date-changed": "19920703"}}
SECURITIES AND EXCHANGE COMMISSION
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
Current Report
Pursuant to Section
3 or 15(d) of the
Securities Exchange Act of 1934
Date of Report (date of earliest event reported): December 9, 2004
LYONDELL CHEMICAL COMPANY
(Exact name of registrant as specified in its charter)
Delaware
(State or other jurisdiction of incorporation)
1-10145								95-4160558
(Commission File Number)					(I.R.S. Employer Identification No.)
1221 McKinney Street, Suite 700, Houston, Texas			   77010
(Address of principal executive offices)				(Zip Code)
(713) 652-7200
(Registrant's telephone number, including area code)
Not Applicable
(Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (
see
General Instruction A.2. below):
o
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 8.01	Other Events
Today, Lyondell Chemical Company ("Lyondell") announced that its Board of Directors has elected to convert Lyondell's outstanding shares of Series B Common Stock, held solely by Occidental Petroleum (through a subsidiary), to Common Stock on December 31, 2004.
These shares will not be registered at the time of the conversion.
Lyondell's December 10, 2004 press release regarding this matter is filed with this Current Report on Form 8-K as Exhibit 99.1.
Item 9.01	Financial Statements and Exhibits
(c)	Exhibits
Press Release
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
LYONDELL CHEMICAL COMPANY
By:
/s/ Kerry A. Galvin
Name:	Kerry A. Galvin
Title:	Senior Vice President, General 									Counsel & Secretary
Date:  December 10, 2004
INDEX TO EXHIBITS
Exhibit
Number
Description
99.1	Press Release