PROCESS FOR THE PRODUCTION OF EXPANDABLE VINYL AROMATIC POLYMER GRANULATE HAVING DECREASED THERMAL CONDUCTIVITY
First Claim
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1. Extrusion process for the production of expandable vinyl aromatic polymer granulate comprising the steps:
- i) feeding a first polymer component comprising vinyl aromatic polymer into a first mixer;
ii) feeding a first additive component a) into the first mixer, to produce a first mixture from the first polymer component and the first additive component;
iii)feeding a second polymer component b) comprising vinyl aromatic polymer into a second mixer;
iv) feeding a second additive component b) into the second mixer, to produce a second mixture from the second polymer component and the second additive component, wherein the processing conditions in the second mixer are more severe than the processing conditions in the first mixer, by providing higher shear force;
v) combining the first and second mixtures, to produce a third mixture;
vi) injecting blowing agent c) into the third mixture, to produce a fourth mixture;
vii)mixing the fourth mixture; and
viii) pelletizing the fourth mixture, to obtain the granulate,wherein the process comprises an extrusion.
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Abstract
The invention relates to an extrusion process for the production of expandable vinyl aromatic polymer granulate comprising mixing first and second additives with first and second polymer components, respectively, in dedicated mixers.
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Citations
21 Claims
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1. Extrusion process for the production of expandable vinyl aromatic polymer granulate comprising the steps:
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i) feeding a first polymer component comprising vinyl aromatic polymer into a first mixer; ii) feeding a first additive component a) into the first mixer, to produce a first mixture from the first polymer component and the first additive component; iii)feeding a second polymer component b) comprising vinyl aromatic polymer into a second mixer; iv) feeding a second additive component b) into the second mixer, to produce a second mixture from the second polymer component and the second additive component, wherein the processing conditions in the second mixer are more severe than the processing conditions in the first mixer, by providing higher shear force; v) combining the first and second mixtures, to produce a third mixture; vi) injecting blowing agent c) into the third mixture, to produce a fourth mixture; vii)mixing the fourth mixture; and
viii) pelletizing the fourth mixture, to obtain the granulate,wherein the process comprises an extrusion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification