Nexam Chemical – PBO in Armacell chemistry…

Posted: 28 September, 2015 in Published Investment Calls

This invention presented here describes a thermoplastic foam material and a method to manufacture said foam material having much lower thermal conductivity by selecting an extrusion tooling (multihole die) in a way that the foam material must be significantly stretched, producing strong cellular orientation with aspect ratio significantly larger than 1.5, ideally even larger than 2.0. In order for the foam material to be able to resist such stretching motion, also the melt strength of the material needs to be increased by means of chain extension via reactive extrusion. Because high viscosity resins, such as described in EP 0866089, are not widely available, recent technological advances have focused on reactive extrusion. During the subsequent foam extrusion chain extending additives need to be added to raise the intrinsic viscosity to a level above 1.2 ml/g. For example EP2163577A1, EP2343330B1, EP 2009043B2, EP2048188A1, WO2009149845A1, US4145466A, and US5000991describe such technologies in detail. For this invention a reactive additive masterbatch (MB) that increases the viscosity by chain extension and side chain branching during extrusion (described as chain extending concentrate in EP2343330B1) has been used.


PBO was used in EP2163577A1, (EP2163577) Chain-extenders and foamed thermoplastic cellular materials obtained by reactive extrusion process and with help of said chain-extenders .

EP2343330B1, (EP2343330) High-concentrate masterbatches comprised of multifunctional compounds for polyester expanding process . ARMACELL ENTERPRISE GMBH

PBO was not used in: EP 2009043B2 Concentrate of polyfunctional compounds usable for the preparation of foamed polyester materials

POINT PLASTIC S R L , EP2048188 B L PLASTIC S R L,  Masterbatch of polyfunctional compounds usable for producing manufactured articles made of expanded polyester resi


(US4145466) Melt strength improvement of PET . Rohm and Haas Company


 Furthermore, an oxazoline for further improvement of foamability of the polyesters can also be composed in the recipe of the multifunctional compound comprising mixture of sterically hindered phenolic antioxidant and tetracarboxylic dianhydride. Mixtures of different oxazoline can be applied in the concentrate recipes. Preferred oxazoline is the monooxazoline for instance 2-, 3- or 4-oxazoline as well as bisoxazoline. Particularly preferred bisoxazoline is 1,3-phenyl bisoxazoline and 1,4-phenyl bisoxazoline. Trioxazoline can be alternatively integrated into the recipe of said concentrates.

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