Foamable silicone composition
AssigneeWacker Chemie AG
InventorsYuanyuan Xu, Anxiang Gao
Life of this patent
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Abstract
Foamable silicone compositions, containing (A) at least one organopolysiloxane containing at least two alkenyl groups bonded to silicon per molecule, (B) at least one organopolysiloxane containing at least two hydrogen atoms bonded to silicon per molecule, (C) at least one porogenic agent generating gaseous hydrogen in the presence of component (B), and (D) at least one hydrosilylation catalyst. Foams obtained by curing such foamable silicone compositions have excellent resilience, moderate hardness, good mechanical properties, and flame retardancy, suitable for the sealing of battery pack cases.
Claims20
A foamable silicone composition comprising the following components:
- (A) at least one organopolysiloxane containing at least two alkenyl groups bonded to silicon, per molecule;
- (B) at least one organopolysiloxane containing at least two hydrogen atoms bonded to silicon, per molecule;
- (C) at least one hydroxy group-containing porogenic agent to generate gaseous hydrogen in the presence of component (B);
- (D) at least one hydrosilylation catalyst;
- and
- (E) a halogen-free graphite flame retardant having a sieve particle size of 80 to 150 μm, the halogen-free graphite flame retardant being present in an amount of 5 wt % to 15 wt % based on the total weight of the foamable silicone composition;
- wherein the molar ratio of SiH groups from component (B) to silicon-bonded alkenyl groups from component (A) is from 5:1 to 15:1;
- the molar ratio of SiH groups from component (B) to hydroxy groups from component (C) is 2:1 to 20:1;
- and the foamable silicone composition is curable to form a foam having a density of 0.4 to 0.6 g/cm3.
A foamable silicone composition comprising the following components:
- (A) at least one organopolysiloxane containing at least two alkenyl groups bonded to silicon, per molecule;
- (B) at least one organopolysiloxane containing at least two hydrogen atoms bonded to silicon, per molecule;
- (C) at least one hydroxy group-containing porogenic agent to generate gaseous hydrogen in the presence of component (B);
- (D) at least one hydrosilylation catalyst;
- and
- (E) a halogen-free graphite flame retardant having a sieve particle size of 80 to 150 μm, the halogen-free graphite flame retardant being present in an amount of 5 wt % to 15 wt % based on the total weight of the foamable silicone composition;
- wherein the molar ratio of SiH groups from component (B) to silicon-bonded alkenyl groups from component (A) is from 5:1 to 15:1;
- the molar ratio of SiH groups from component (B) to hydroxy groups from component (C) is 2:1 to 20:1;
- and the foamable silicone composition has a viscosity of 100,000 to 300,000 mPa·s.
Dependencies are inferred from the claim text.