Document:

Exhibit 4.05

 

English Summary of

Petrochemical Naphtha Purchase and Sale Agreement
by and Between

Petróleo Brasileiro S.A. –
Petrobras and Braskem S.A.

The summary below contains an abridged description of the principal
terms of the agreement originally executed in Portuguese language by the parties referred to herein (the “Agreement”).

1. Date of execution: June 8, 2020.

2. Parties: Petróleo Brasileiro S.A. –
Petrobras (“Petrobras”), as seller, and Braskem S.A. (“Braskem”), as purchaser.

3. Object: sale by Petrobras and purchase by Braskem
of up to 2,850,000 tons per year, at Petrobras’ option, of petrochemical naphtha to be delivered to Braskem’s petrochemical
plants in the State of Bahia and Rio Grande do Sul. The agreement contains certain terms relating to additional orders, and other related
terms and schedules. Pursuant to the Agreement, the parties may agree to modify the amount of firm orders under certain conditions and
subject to price adjustments according to calculation formulas contained in the Agreement. The Agreement also contains provisions for
quantities not delivered or not received and corresponding adjustments.

4. Term: the term of the agreement is five years, from
January 1, 2021 to December 31, 2025.

5. Delivery schedule: the Agreement contains certain
provisions relating to delivery and retrieval schedules that may be adjusted based on forecasts and other variables.

6. Quality and inspection: the naphtha delivered pursuant
to the terms and conditions contained in the Agreement must comply with certain technical and quality specifications set forth in the
Agreement.

7. Measurement and delivery: the Agreement contains
certain terms, conditions and requirements for the measurement of amounts delivered and conditions for delivery.

8. Price: the naphtha prices will be 100% Naphtha ARA.

9. Credit facility: the Agreement contains a provision
allowing Petrobras to grant a credit facility for the benefit of Braskem under the Agreement for payment of invoices on credit, at its
sole discretion, which shall be subject to certain guarantees and may be terminated at any time with prior notice.

10. Liability and indemnification: the Agreement contains
certain provisions relating to the parties’ liabilities and indemnification obligations for damages, loss of profit and other events,
including certain exceptions for acts of God and force majeure under Brazilian law.

    	 

    	 

    

11. Termination: the Agreement may be terminated by
either party upon: (i) being notified at least 30 days in advance of the failure to comply with any terms or conditions of the Agreement;
(ii) transfer or assignment of the Agreement; (iii) certain changes in the capital structure or modification of any party’s corporate
purpose or whenever there is a conflict with the purpose of the Agreement; (iv) failure to comply with certain specific provisions of
the Agreement; and (v) other conditions set forth in the Agreement. In addition, Petrobras may terminate the Agreement in case of bankruptcy,
ratification of extrajudicial reorganization or approval of judicial reorganization proceedings of Braskem if no sufficient security deposit
is posted pursuant to contractual obligations. A non-defaulting party may choose to suspend the Agreement instead of terminating it until
the breach of a contractual provision is cured.

12. Assignment: a party may not assign or transfer the
agreement without the prior written consent of the other party, and shall remain jointly and severally liable with the assignee for any
contractual obligation that is assigned.

13. Confidentiality: for five years after the termination
of the Agreement, the parties agreed to hold all information transmitted under, pursuant or related to the Agreement in confidentiality.

14. Governing law and forum: the Agreement is governed
by Brazilian law, and any dispute under the Agreement shall be resolved by the courts of the city of Rio de Janeiro, in the State of Rio
de Janeiro, Brazil.Exhibit 4.06

 

English Summary of

Petrochemical Naphtha Purchase and Sale Agreement
by and Between

Petróleo Brasileiro S.A. –
Petrobras and Braskem S.A.

The summary below contains an abridged description of the principal
terms of the agreement originally executed in Portuguese language by the parties referred to herein (the “Agreement”).

1. Date of execution: June 8, 2020.

2. Parties: Petróleo Brasileiro S.A. –
Petrobras (“Petrobras”), as seller, and Braskem S.A. (“Braskem”), as purchaser.

3. Object: sale by Petrobras and purchase by Braskem
of 37,500 tons per month of petrochemical naphtha to be delivered to Braskem’s petrochemical plant in the State of Bahia. The monthly
minimum amount may be subject to reduction in case of certain events, including stoppages, and according to a calculation formula set
forth in the agreement. The agreement contains certain terms relating to additional orders, and other related terms and schedules. Pursuant
to the Agreement, the parties may agree to modify the amount of firm orders under certain conditions and subject to price adjustments
according to calculation formulas contained in the Agreement. The Agreement also contains provisions for quantities not delivered or not
received and corresponding adjustments.

4. Term: the term of the agreement is five years, from
December 23, 2020 to December 31, 2025.

5. Delivery schedule: the Agreement contains certain
provisions relating to delivery and retrieval schedules that may be adjusted based on forecasts and other variables.

6. Quality and inspection: the naphtha delivered pursuant
to the terms and conditions contained in the Agreement must comply with certain technical and quality specifications set forth in the
Agreement.

7. Measurement and delivery: the Agreement contains
certain terms, conditions and requirements for the measurement of amounts delivered and conditions for delivery.

8. Price: the naphtha prices will be 100% Naphtha ARA.

9. Credit facility: the Agreement contains a provision
allowing Petrobras to grant a credit facility for the benefit of Braskem under the Agreement for payment of invoices on credit, at its
sole discretion, which shall be subject to certain guarantees and may be terminated at any time with prior notice.

10. Liability and indemnification: the Agreement contains
certain provisions relating to the parties’ liabilities and indemnification obligations for damages, loss of profit and other events,
including certain exceptions for acts of God and force majeure under Brazilian law.

    	 

    	 

    

11. Termination: the Agreement may be terminated by
either party upon: (i) being notified at least 30 days in advance of the failure to comply with any terms or conditions of the Agreement;
(ii) transfer or assignment of the Agreement; (iii) certain changes in the capital structure or modification of any party’s corporate
purpose or whenever there is a conflict with the purpose of the Agreement; (iv) failure to comply with certain specific provisions of
the Agreement; and (v) other conditions set forth in the Agreement. In addition, Petrobras may terminate the Agreement in case of bankruptcy,
ratification of extrajudicial reorganization or approval of judicial reorganization proceedings of Braskem if no sufficient security deposit
is posted pursuant to contractual obligations. A non-defaulting party may choose to suspend the Agreement instead of terminating it until
the breach of a contractual provision is cured.

12. Assignment: a party may not assign or transfer the
agreement without the prior written consent of the other party, and shall remain jointly and severally liable with the assignee for any
contractual obligation that is assigned. Petrobras may assign this agreement to the corporate that may succeed Petrobras in the ownership
of the Asset Refinaria Landulpho Alves (RLAM).

13. Confidentiality: for five years after the termination
of the Agreement, the parties agreed to hold all information transmitted under, pursuant or related to the Agreement in confidentiality.

14. Governing law and forum: the Agreement is governed
by Brazilian law, and any dispute under the Agreement shall be resolved by the courts of the city of Rio de Janeiro, in the State of Rio
de Janeiro, Brazil.Exhibit 4.07

 

English Summary of

Petrochemical Naphtha Purchase and Sale Agreement
by and Between

Petróleo Brasileiro S.A. –
Petrobras and Braskem S.A.

The summary below contains an abridged description of the principal
terms of the agreement originally executed in Portuguese language by the parties referred to herein (the “Agreement”).

1. Date of execution: December 22, 2020.

2. Parties: Petróleo Brasileiro S.A. –
Petrobras (“Petrobras”), as seller, and Braskem S.A. (“Braskem”), as purchaser.

3. Object: sale by Petrobras and purchase by Braskem
of petrochemical naphtha in certain minimum monthly and maximum yearly amounts set forth in the Agreement. The maximum yearly amount is
2,000,000 tons per year. The monthly minimum amount may be subject to reduction in case of certain events, including stoppages, and according
to a calculation formula set forth in the agreement. The agreement contains certain terms relating to firm orders for certain periods
of time, minimum orders, additional orders, and other related terms and schedules. Pursuant to the Agreement, the parties may agree to
modify the amount of firm orders, minimum orders and additional amounts under certain conditions and subject to price adjustments according
to calculation formulas contained in the Agreement. The Agreement also contains provisions for quantities not delivered or not received
and corresponding adjustments.

4. Term: the term of the agreement is five years, from
December 23, 2020 to December 31, 2025.

5. Delivery schedule: the Agreement contains certain
provisions relating to delivery and retrieval schedules that may be adjusted based on forecasts and other variables.

6. Quality and inspection: the naphtha delivered pursuant
to the terms and conditions contained in the Agreement must comply with certain technical and quality specifications set forth in the
Agreement.

7. Measurement and delivery: the Agreement contains
certain terms, conditions and requirements for the measurement of amounts delivered and conditions for delivery.

8. Price: the naphtha prices will be based on international
references.

9. Credit facility: the Agreement contains a provision
allowing Petrobras to grant a credit facility for the benefit of Braskem under the Agreement for payment of invoices on credit, at its
sole discretion, which shall be subject to certain guarantees and may be terminated at any time with prior notice.

    	 

    	 

    

10. Liability and indemnification: the Agreement contains
certain provisions relating to the parties’ liabilities and indemnification obligations for damages, loss of profit and other events,
including certain exceptions for acts of God and force majeure under Brazilian law.

11. Termination: the Agreement may be terminated by
either party upon: (i) being notified at least 30 days in advance of the failure to comply with any terms or conditions of the Agreement;
(ii) transfer or assignment of the Agreement; (iii) certain changes in the capital structure or modification of any party’s corporate
purpose or whenever there is a conflict with the purpose of the Agreement; (iv) failure to comply with certain specific provisions of
the Agreement; and (v) other conditions set forth in the Agreement. In addition, Petrobras may terminate the Agreement in case of bankruptcy,
ratification of extrajudicial reorganization or approval of judicial reorganization proceedings of Braskem if no sufficient security deposit
is posted pursuant to contractual obligations. A non-defaulting party may choose to suspend the Agreement instead of terminating it until
the breach of a contractual provision is cured.

12. Assignment: a party may not assign or transfer the
agreement without the prior written consent of the other party, and shall remain jointly and severally liable with the assignee for any
contractual obligation that is assigned.

13. Confidentiality: for five years after the termination
of the Agreement, the parties agreed to hold all information transmitted under, pursuant or related to the Agreement in confidentiality.

14. Governing law and forum: the Agreement is governed
by Brazilian law, and any dispute under the Agreement shall be resolved by the courts of the city of Rio de Janeiro, in the State of Rio
de Janeiro, Brazil.

15. Exhibits and schedules: the Agreement contains an
exhibit with information regarding delivery forecasts, criteria for the calculation of balances, and certain other technical terms.

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