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US 8,895,669 B2Granted
Method for producing ABA-triblock copolymers with a bimodal B-block
AssigneesEvonik Roehm GmbH, Henkel AG & Co. KGaA
InventorsSven Balk, Holger Kautz, Stephan Fengler, Christine Troemer, Monika Maerz, Lars Zander, Jens Lueckert, Johann Klein, Thomas Moeller, Volker Erb
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Abstract
The invention relates to a controlled polymerization method for producing ABA-triblock copolymers on the basis of (meth)acrylate with A-blocks which have a narrow, monomodal molecular weight distribution and a B-block which has a bimodal molecular weight distribution, and to the use thereof as binders in glues and sealing materials.
Claims19
A process for preparing a block copolymer by a sequentially implemented atom transfer radical polymerization (ATRP), the process comprising:
- adding a bifunctional initiator to a polymerization solution in two batches, a first initiator batch and a second initiator batch,
- wherein the block copolymer has an ABA composition and an overall molecular weight distribution with a polydispersity index of greater than 1.8.
Dependencies are inferred from the claim text.