Thermally expandable compositions comprising urea derivatives
AssigneeHenkel AG & Co. KGaA
InventorsRainer Kohlstrung, Klaus Rappmann, Sascha Poeller
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Abstract
The present application relates to a thermally expandable composition containing at least one peroxide cross-linking polymer, at least one peroxide and at least one endothermic, chemical blowing agent, the blowing agent comprising at least one solid, optionally functionalized, polycarboxylic acid or the salt thereof and at least one urea derivative according to the formula (I) as defined herein; as well as shaped bodies containing the composition and to a method for sealing and filling voids in components, for strengthening or reinforcing components, in particular hollow components, and for bonding mobile components using shaped bodies of this type.
Claims20
A thermally expandable composition, comprising:
- a) at least one peroxidically cross-linking polymer;
- b) at least one peroxide;
- and
- c) at least one endothermic chemical blowing agent comprising at least one carboxylic acid or salt thereof, and at least one urea derivative of formula(I)
- R1—NH—C(═X)—NR2R3 (I),
- wherein X denotes O or S;
- and
- R1, R2 and R3 independently denote H, unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl or —C(O)—R4, where R4 denotes H or substituted or unsubstituted alkyl;
- wherein the thermally expandable composition comprises less than 0.1 wt. % of hydrogen carbonates and carbonates.
A thermally expandable composition, comprising:
- a) at least one peroxidically cross-linking polymer;
- b) at least one peroxide;
- and
- c) at least one endothermic chemical blowing agent comprising at least one carboxylic acid or salt thereof, and at least one urea derivative of formula (I)
- R1—NH—C(═X)—NR2R3 (I),
- wherein in the urea derivatives of formula (I):
- (i) X denotes O;
- and
- (ii) R2 and R3 are selected from H and unsubstituted alkyl functional groups, optionally comprising C1-4 alkyl functional groups;
- and
- (iii) R1 is selected from H;
- unsubstituted alkyl functional groups, optionally comprising C1-4 alkyl functional groups;
- substituted or unsubstituted aryl functional groups, optionally comprising substituted or unsubstituted phenyl functional groups.
A thermally expandable composition, comprising:
- a) at least one peroxidically cross-linking polymer;
- b) at least one peroxide;
- and
- c) at least one endothermic chemical blowing agent,
- wherein the at least one endothermic chemical blowing agent comprises at least one solid, optionally functionalized, polycarboxylic acid or the salt thereof, and at least one urea derivative of formula (I)
- R1—NH—C(═X)—NR2R3 (I),
- where X denotes O or S,
- R1, R2 and R3 independently denote H, substituted or unsubstituted alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted aryl or —C(O)—R4, where R4 denotes H or substituted or unsubstituted alkyl;
- wherein the weight ratio of the urea derivative to the solid polycarboxylic acid is from 0.1:1 to 0.1:20;
- and the thermally expandable composition comprises less than 0.1 wt. % of hydrogen carbonates and carbonates.
Dependencies are inferred from the claim text.