Sika Technology Ag

Dusko Paripovic

Leslie Wolschleger

Cendrine Ribot

Karsten Frick

Geng Lin

Christian Hardt

Antonio Voci

Jean Georges Becker

Dominique Gallo

Jena Mabilia

Engin Cil

Artur Marfinati

Jan Spengler

Achim Kohl

Loic Zingraff

Leslie Michele Wolschleger

Nicolae Bordeanu

A thermally expandable composition includes at least one polymer P, at least one chemical blowing agent CBA, at least one physical blowing agent PBA composed of expandable microspheres, and at least one filler F. A damping element includes a first layer composed of an expansion material and a second layer composed of an acoustic damping material. The damping element is suitable for providing vibration and/or noise damped systems.

Expandable material with improved thermal insulation properties and use thereof

A thermally expandable composition, including: (a) at least one polymer P, cross-linkable by a free-radical initiator; (b) at least one acrylate A; (c) at least one free-radical initiator; (d) at least one blowing agent; and (e) at least one surfactant, whereby the surfactant is a sulfonate salt. The thermally expandable composition is able to provide sufficient expansion behaviour when used in the form of a thin layer and is especially suitable for baffle and/or reinforcement elements.

Foam with improved expansion behaviour when used in thin layers

A thermally expandable composition, including at least one polymer, cross-linkable by peroxide, at least one peroxide, preferably at least one antioxidant, at least one chemical blowing agent, and at least one activator, wherein the activator includes at least one compound selected from formula (I), wherein radicals Rand Rrepresent hydrogen atoms or monovalent alkyl radicals with 1 to 10 carbon atoms which optionally include oxygen atoms; Rand Rrepresent hydrogen atoms or monovalent alkyl radicals with 1 to 10 carbon atoms which optionally include oxygen atoms, nitrogen atoms, and/or aromatic moieties or Rand Rtogether form a divalent alkyl radical with 1 to 10 carbon atoms which optionally includes oxygen atoms, nitrogen atoms or aromatic moieties. The composition shows excellent properties in terms of expansion stability over a wide temperature range, can be expanded at temperatures below 150&#xb0; C. and is suitable for baffle and/or reinforcement elements.

Heat expandable foam for low temperature cure

Disclosed is a thermally expandable composition, comprising at least one polymer P, cross-linkable by peroxide, and between 1 wt.-% and 2.5 wt.-%, based on the total weight of the composition, of at least one acrylate A, and between 0.2 wt.-% and 2.5 wt.-%, based on the total weight of the composition, of at least one peroxide, and at least one blowing agent, characterised in that the equivalent ratio of said peroxide to said acrylate A is between 0.01 and 0.5, preferably between 0.13 and 0.41, and the weight ratio of said peroxide to said acrylate A is lower than 0.33 and said polymer P comprises or essentially consists of at least two polymers PI and P2, wherein PI exhibits a melt flow index (MFI) of between 100 and 200 g/10 min, and P2 exhibits a melt flow index of between 0.1 and 60 g/10 min, wherein MFI is determined by ASTM D1238. The thermally expandable composition shows excellent properties in terms of expansion stability and minimised buckling and is especially suitable for baffle and/or reinforcement elements, e.g. in automotive manufacturing.

Acoustical foam with improved performance

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Zurich, Switzerland

Dusko Paripovic