Flame-resistant airbag, method of manufacturing flame-resistant airbag, and addition-curable liquid silicone rubber composition for flame-resistant airbags

A method of manufacturing flame-resistant airbags, comprising the steps of:

• preparing an addition-curable liquid silicone rubber composition comprising
• (A) 100 parts by weight of an organopolysiloxane which contains at least two silicon-bonded alkenyl groups of 2 to 8 carbon atoms per molecule and is liquid at 25° C.,
• (B) from 5 to 100 parts by weight of a three-dimensional network-type organopolysiloxane resin in which from 0.05 to 0.15 mol/100 g of alkenyl groups are bonded solely to difunctional R1R2SiO2/2 units (D units;
• in the formula, R1 is an alkenyl group of 2 to 8 carbon atoms and R2 is a group selected from alkyl groups of 1 to 8 carbon atoms, alkenyl groups of 2 to 8 carbon atoms and aryl groups of 6 to 12 carbon atoms), in which the ratio (M units/T and/or Q units) of monofunctional R33SiO1/2 units (M units;
• in the formula, each R3 is independently a group selected from alkyl groups of 1 to 8 carbon atoms and aryl groups of 6 to 12 carbon atoms) to branched siloxane units which are trifunctional R3SiO3/2 units (T units;
• in the formula, R3 is the same as above) and/or tetrafunctional SiO4/2 units (Q units) is from 0.65 to 1.40, and in which the amount of hydroxyl groups is 0.040 mol/100 g or less,
• (C) from 0.1 to 50 parts by weight of a silica fine powder having a specific surface area according to the BET method of at least 50 m2/g,
• (D) an organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms per molecule, in an amount such that the number of silicon-bonded hydrogen atoms included on a molecule of component (D) per silicon-bonded alkenyl group in components (A) and (B) combined is from 1 to 10,
• (E) an effective amount of a platinum family metal catalyst as a hydrosilylation reaction catalyst, and
• (F) from 0.1 to 10 parts by weight of an organosilicon compound having on the molecule, as adhesion-promoting functional groups, an epoxy group and a silicon-bonded alkoxy group;
• coating the composition onto at least one side of an airbag base fabric to a coating weight of from 5 to 150 g/m2;
• and
• heat-curing the base fabric coated with the composition.

An addition-curable liquid silicone rubber composition for flame-resistant airbags, comprising:

• (A) 100 parts by weight of an organopolysiloxane which includes at least two silicon-bonded alkenyl groups of 2 to 8 carbon atoms per molecule and is liquid at 25° C.;
• (B) from 5 to 100 parts by weight of a three-dimensional network-type organopolysiloxane resin in which from 0.05 to 0.15 mol/100 g of alkenyl groups are bonded solely to difunctional R1R2SiO2/2 units (D units;
• in the formula, R1 is an alkenyl group of 2 to 8 carbon atoms and R2 is a group selected from alkyl groups of 1 to 8 carbon atoms, alkenyl groups of 2 to 8 carbon atoms and aryl groups of 6 to 12 carbon atoms), in which the ratio (M units/T and/or Q units) of monofunctional R33SiO1/2 units (M units;
• in the formula, each R3 is independently a group selected from alkyl groups of 1 to 8 carbon atoms and aryl groups of 6 to 12 carbon atoms) to branched siloxane units which are trifunctional R3SiO3/2 units (T units;
• in the formula, R3 is the same as above) and/or tetrafunctional SiO4/2 units (Q units) is from 0.65 to 1.40, and in which the amount of hydroxyl groups is 0.040 mol/100 g or less;
• (C) from 0.1 to 50 parts by weight of a silica fine powder having a specific surface area according to the BET method of at least 50 m2/g;
• (D) an organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms per molecule, in an amount such that the number of silicon-bonded hydrogen atoms included on a molecule of component (D) per silicon-bonded alkenyl group in components (A) and (B) combined is from 1 to 10;
• (E) an effective amount of a platinum family metal catalyst as a hydrosilylation reaction catalyst;
• and
• (F) from 0.1 to 10 parts by weight of an organosilicon compound having on the molecule, as adhesion-promoting functional groups, an epoxy group and a silicon-bonded alkoxy group.