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US 2019/0338077 A1Published application
Elastomeric compositions and their applications
AssigneeDow Silicones Corporation
InventorsGregory CHAMBARD, Tommy DETEMMERMAN, Tatiana DIMITROVA, Frederic GUBBELS
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Abstract
The present disclosure generally relates to 2 part silicone compositions which cure via a condensation cure chemistry using titanium and/or zirconium based catalysts to generate elastomeric or gel end products and the applications for same.
Claims23
A multiple part condensation curable elastomer or gel composition based on titanate/zirconate cure catalysts, the composition comprising:
- (i) at least one condensation curable silyl terminated polymer having at least one, optionally at least 2 hydroxyl functional groups per molecule;
- (ii) a cross-linker selected from the group consisting of;
- silanes having at least 2 hydrolysable groups, optionally at least 3 hydrolysable groups per molecule, and/or
- silyl functional molecules having at least 2 silyl groups, each silyl group containing at least one hydrolysable group;
- (iii) one or more hydrous fillers having a moisture content of >0.05% by weight as determined in accordance with ISO 787-2:1981;
- and
- (iv) a condensation catalyst selected from the group consisting of titanates and/or zirconates;
- wherein polymer (i), cross-linker (ii) and condensation catalyst (iv) are not stored together in the same part;
- and
- wherein the condensation catalyst (iv) is present in a molar amount which is at least 50% of the moisture present cumulatively in the parts of the composition as determined in accordance with ISO 787-2:1981.
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Dependencies are inferred from the claim text.