Akzo Nobel Chemicals International B.v.

Manfred Menzel

Olaf Klobes

Volker Burkhardt

Heinz Aldenhoven

Antonius Van Pelt

Daniela Lungu

Process for the preparation of a polysulfide comprising the step of reacting in the absence of a dihaloalkane a bis(2-dihaloalkyl)formal in the presence of (i) a pre-polymer (I) according to structure (I)X&#x2014;(R2&#x2014;O)&#x2014;CH2&#x2014;O&#x2014;(R1&#x2014;O)&#x2014;CH2&#x2014;(O&#x2014;R2)&#x2014;X&#x2003;&#x2003;(I),wherein R1 and R2 can be the same or different and are selected from alkane chains containing 2-10 carbon atoms, X is a halogen atom, and n, m, and p are integers that can be the same or different and have a value in the range 1-6, with either (i) sodium polysulfide or (ii) a combination of sodium hydrosulfide and sulfur.

Low-salt process for the preparation of a polysulfide

Process for the preparation of a mercapto-terminated liquid polymer comprising the steps of: a) reacting (para)formaldehyde with a halo-alcohol to form a reaction mixture comprising bis(2-dihaloalkyl)formal and b) reacting the reaction mixture of step a) with either (i) sodium polysulfide or (ii) a combination of sodium hydrosulfide and sulfur, wherein the process is performed in the presence of a branching agent selected from the group consisting of di-aldehydes and their corresponding actetals and hemi-acetals.

Process for the preparation of a mercapto-terminated liquid polymer

Pre-polymer according to structure (I) X&#x2014;(R&#x2014;O)&#x2014;CH&#x2014;O&#x2014;(R&#x2014;O)&#x2014;CH&#x2014;(O&#x2014;R)&#x2014;X (I) wherein Rand Rcan be the same or different and are selected from alkane chains containing 2-10 carbon atoms, X is a halogen atom, and n, m, and p are integers that can be the same of different and have a value in the range 1-6. The use of this pre-polymer in the preparation of a liquid polysulfide polymer allows better control over the sulfur and oxygen content and the polarity of the resulting polymer.

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Greiz, Germany

Manfred Menzel