1959
- foundation of Organic Chemical Industry - OKI in Zagreb

1961
- start of the construction of the Žitnjak petrochemical complex 1962

1962
- installation of the first pieces of heavy equipment

1963
- firing of pyrolytic kilns
- start of trial operation at ethylene and polyethylene plants

1964
- gradual coming on line of other plants

1965
- decision to establish a plastic processing plant

1967
- merger with Preplam, the largest plastic processor in Zagreb at that time

1970
- start of production in the polyethylene packaging plant at Pregrada

1971
- merger with Dalmacijaplastika of Drniš
- decision to build the expanded polystyrene plant at General Janković in Kosovo

1974
- start of production in the rotational moulding plant at Pregrada, capacity 300t/y

1975
- start of construction of the Žitnjak polystyrene plant, a joint venture with the US Dow Chemical Company

1976
- referendum on integration with the INA Group - foundation of DINA Petrokemija (petrochemistry ) based in Rijeka
- OKI's plant reconstruction to increase polyethylene production to 33 000 t/y
- start of production in expanded polystyrene at General Janković in Kosovo

1977
- start of operation at DINA - Petrokemija

1978
- start of construction of polyethylene and VCM/EDC plants at DINA
- start of production in the DOKI polystyrene plant at Žitnjak; installed capacity: 40 000 t/y

1979
- modernisation and expansion of polyethylene and polystyrene processing facilities
- start of polyethylene production in the newly constructed plant at Žitnjak; capacity 50 000 t/y
- increase in expandable polystyrene capacity to
9 000 t/y

1982
- divestment of Ivanićplast processing plant

1983
- completion of the construction of polyethylene and power – generating plants at DINA
- modernisation of the PE pipe plant at Drniš; capacity 5 000 t/y

1984
- copperplate-printing plant at Drniš leaves
INA-OKI
- start of trial operation in the DINA LDPE plant,
70 000 t/y capacity plant
- reconstruction of the expandable polystyrene plant to increase capacity to 18 000 t/y
- completion of the VCM/EDC plant and auxiliary facilities at DINA

1985
- trial operation of the VCM/EDC plant at DINA
- start of operation in the reconstructed phenol and acetone production plant at Žitnjak

1986
- start of operation of the polyethylene powder plant at Pregrada; capacity 3 500 t/y

1988
- signing of the contract for the purchase of equipment for the production of polymer compounds and composites

1989
- ecological award the Vjesnik Blue Ribbon to DINA for its help in pumping out styrene monomer from the sunken S/S Brigitta Montanari
- harmonization of the Company by–law with the Companies Act
- significant changes in business operations and market position

1990
- the Foundation of Public Company
INA - Industrija nafte act under which socially owned property becomes state property
- definition of legal framework for the transformation of INA and all its members

1991
- INA-OKI becomes a joint stock company, and its subsidiaries located at Pregrada, Drniš and Kosovo are transformed into separate legal entities
- beginning of the war, market disintegration, loss of plants at General Janković and Drniš
- start of alerts at INA-OKI because of immediate war danger
- decision to temporary stop production
- one week's stoppage of production at DINA

1992
- resolution by INA-OKI Management Board to separate processing plants to form them as daughter – companies, and to expand operations of OKI, the parent company
- award of Golden Trophy for Quality (for the third time) for continuity of successful production of polyethylene and polystyrene
- the best annual results achieved in production and sale of plastics (140 759 t) in INA-OKI

1993
- certification of DINA (ISO 9002), DINA being the first company in Croatia to be awarded this certificate
- stop of production in refinery plants for production of petrochemicals (ethylene, styrene, alkylation, and phenol-acetone) for technological and economic reasons

1995
- implementation of the restructuring programme,
- establishment of new daughter companies, i.e. OKI Kemikalije (OKI Chemicals) and OKI-Usluge (OKI Services)
- foundation of INA-Polimeri d.o.o., a merger of INA-OKI, DINA and INA-Naftaplin's Ethylene Plant
- formation of the company's own Foreign Trade Department (until that time all foreign business was conducted through INA-Commerce)

1996
- award of ISO 9002/94 to INA-OKI

1997
- decision by INA to separate INA-Polimeri from INA Group. The company starts operating under the name Polimeri d.o.o.

1998
- in the process of voucher privatization majority interest in Polimeri d.o.o. (51%) transferred to three privatisation funds
- decision by the State Office for Standardization and Metrology to award an accreditation certificate to the company's own Physical and Chemical Laboratory for carrying out mechanical, thermal and rheological testing of polymer materials in compliance with the requirements of the HRN EN 45001 standard

1999
- registration of the company as a joint stock company (d.d.) with authorised share capital of HRK 2 021 029 000;
- the company changes its name to DIOKI d.d.

2000
- a new three-member Management Board prepared and started implementation of a medium-term Restructuring Plan with the purpose of modernising the company

2004
- in mid 2004, the DIOKI company was privatized and DIOKI Holding AG, headquartered in Switzerland became the majority owner. A new management board and supervisory board were appointed.

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