CPC A61M 1/915 (2021.05) [A61F 13/0216 (2013.01); A61L 15/26 (2013.01); A61L 15/425 (2013.01); A61L 15/585 (2013.01); A61L 24/0073 (2013.01); A61L 26/0095 (2013.01); C08L 83/04 (2013.01); C08G 77/12 (2013.01); C08G 77/20 (2013.01)] | 17 Claims |
1. A curable composition apportioned between at least one Part A and at least one Part B, the composition comprising:
the at least one Part A comprising one or more alkenyl-group containing polymers having at least one, or at least two, alkenyl group or moiety per molecule,
the at least one Part B comprising one or more SiH-containing polymers having at least one, or at least two, Si—H unit or moiety per molecule,
a catalyst for curing by addition of an alkenyl-containing polymer to a SiH-containing polymer, and
a blowing agent configured to evolve gas as part of or during the curing reaction,
wherein the SiH-containing polymer is absent from Part A and the alkenyl-group containing polymer is absent from Part B or Part B incorporates a trace amount of the alkenyl-group containing polymer represented as a molar ratio (Si—H unit or moiety)/(alkenyl unit or moiety) of greater than or equal to 2000.
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