Organopolysiloxane composition for fire-resistant foamed silicone rubber

Claim 2

A foamable organopolysiloxane composition capable of being converted into a cured foamed silicone rubber which comprises: (a) 100 parts by weight of a first diorganopolysiloxane having a hydroxy group bonded to the silicon atom at each of the molecular chain ends and represented by the general formula HO--SiR.sub.2 --O--SiR.sub.2 --O.sub.m SiR.sub.2 --OH, in which R is a monovalent hydrocarbon group free from aliphatic unsaturation and m is a positive integer in the range from 5 to 10,000; (b) from 10 to 100 parts by weight of a second diorganopolysiloxane having a vinyl group bonded to the silicon atom at each of the molecular chain ends and represented by the general formula CH.sub.2 ═CH--SiR.sub.2 --O--SiR.sub.2 --O.sub.n SiR.sub.2 --CH═CH.sub.2, in which R has the same meaning as defined above and n is a positive integer in the range from 10 to 1000; (c) an organohydrogenpolysiloxane having, in a molecule, at least two hydrogen atoms directly bonded to the silicon atoms in such an amount that from 2.0 to 40.0 moles of the silicon-bonded hydrogen atoms are provided per mole of the overall amount of the hydroxy groups in the first diorganopolysiloxane and the vinyl groups in the second diorganopolysiloxane; (d) from 5 to 100 parts by weight of an inorganic filler; (e) a platinum compound in a catalytic amount; (f) from 5 to 100 parts by weight of aluminum hydroxide; and (g) from 0.1 to 5 parts by weight of red phosphorus.

Claim 3

The foamable organopolysiloxane composition as claimed in claim 1 wherein the monovalent hydrocarbon group free from aliphatic unsaturation denoted by R is a methyl group or a phenyl group.

Claim 4

The foamable organopolysiloxane composition as claimed in claim 1 wherein the platinum compound is chloroplatinic acid.

Claim 5

The foamable organopolysiloxane composition as claimed in claim 1 wherein the amount of the platinum compound is in the range from 1 to 200 ppm by weight based on the overall amount of the components (a), (b) and (c).

Claim 6

The foamable organopolysiloxane composition as claimed in claim 1 which further comprises an acetylene alcohol.

Claim 9

The method for the preparation of a cured foamed silicone rubber body as claimed in claim 6 wherein the components (a) to (g) before blending are stored in two packages and the component (c) and the component (e) are contained in different packages each from the other.

Claim 10

The method for the preparation of a cured foamed silicone rubber body as claimed in claim 7 wherein one of the two packages contains the components (a), (d), (e), (f) and (g) and the other of the two packages contains the components (b), (c), (d), (f) and (g).

Claim 11

A cured foamed silicone rubber body which is a product produced by curing and foaming a foamable organopolysiloxane composition capable of being converted into a cured foamed silicone rubber which comprises: (a) 100 parts by weight of a first diorganopolysiloxane having a hydroxy group bonded to the silicon atom at each of the molecular chain ends and represented by the general formula HO--SiR.sub.2 --O--SiR.sub.2 --O.sub.m SiR.sub.2 --OH, in which R is a monovalent hydrocarbon group free from aliphatic unsaturation and m is a positive integer in the range from 5 to 10,000; (b) from 10 to 100 parts by weight of a second diorganopolysiloxane having a vinyl group bonded to the silicon atom at each of the molecular chain ends and represented by the general formula CH.sub.2 ═CH--SiR.sub.2 --O--SiR.sub.2 --O.sub.n SiR.sub.2 --CH═CH.sub.2, in which R has the same meaning as defined above and n is a positive integer in the range from 10 to 1000; (c) an organohydrogenpolysiloxane having, in a molecule, at least two hydrogen atoms directly bonded to the silicon atoms in such an amount that from 2.0 to 40.0 moles of the silicon-bonded hydrogen atoms are provided per mole of the overall amount of the hydroxy groups in the first diorganopolysiloxane and the vinyl groups in the second diorganopolysiloxane; (d) from 5 to 100 parts by weight of an inorganic filler; (e) a platinum compound in a catalytic amount; (f) from 5 to 100 parts by weight of aluminum hydroxide; and (g) from 0.1 to 5 parts by weight of red phosphorus.

Claim 12

A cured foamed silicone rubber body which is a product produced by curing and foaming a foamable organopolysiloxane composition capable of being converted into a cured foamed silicone rubber which comprises: (a) 100 parts by weight of a first diorganopolysiloxane having a hydroxy group bonded to the silicon atom at each of the molecular chain ends and represented by the general formula HO--SiR.sub.2 --O--SiR.sub.2 --O.sub.m SiR.sub.2 --OH, in which R is a monovalent hydrocarbon group free from aliphatic unsaturation and m is a positive integer in the range from 5 to 10,000; (b) from 10 to 100 parts by weight of a second diorganopolysiloxane having a vinyl group bonded to the silicon atom at each of the molecular chain ends and represented by the general formula CH.sub.2 ═CH--SiR.sub.2 --O--SiR.sub.2 --O.sub.n SiR.sub.2 --CH═CH.sub.2, in which R has the same meaning as defined above and n is a positive integer in the range from 10 to 1000; (c) an organohydrogenpolysiloxane having, in a molecule, at least two hydrogen atoms directly bonded to the silicon atoms in such an amount that from 2.0 to 40.0 moles of the silicon-bonded hydrogen atoms are provided per mole of the overall amount of the hydroxy groups in the first diorganopolysiloxane and the vinyl groups in the second diorganopolysiloxane; (d) from 5 to 100 parts by weight of an inorganic filler; (e) a platinum compound in a catalytic amount; (f) from 5 to 100 parts by weight of aluminum hydroxide; and (g) from 0.1 to 5 parts by weight of red phosphorus.