Adhesion of silicone sealant

Claim 1

A composition consisting essentially of a product obtained by mixing (A) 100 parts by weight of a hydroxyl or alkoxy endblocked polydiorganosiloxane having viscosity of between 1.0 and 100 Pa.s at 25° C. the organic groups being selected from the group consisting of methyl, ethyl, propyl, phenyl, and trifluoropropyl. (B) from 0.35 to 9.0 parts by weight of an alkyltrialkoxysilane of the formula RSi(OR') 3 where R is a monovalent hydrocarbon radical of from 1 to 4 carbon atoms and R is an alkyl or alkoxyalkyl radical. (C) from 0.5 to 5.0 parts by weight of titanium catalyst such that there is from 0.05 to O.94 part of titanium. (D) from 0 to 250 parts by weight of filler, (E) silane of the formula (MeO).sub.3 SiCH.sub.2 CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2 in an amount such that there is from 0.1 to 1.0 mole of silane per mole of titanium in (C), and (F) silane of the formula ##STR8## an amount such that there is at least 25 percent on a molar basis of the amount of (E) present, and less than about 5 percent by weight based upon the weight of (A).

Claim 16

A method of producing a one-part silicone sealant curable on exposure to moisture having improved adhesion to a variety of substrates when cured consisting essentially of mixing, in the absence of moisture, (A) 100 parts by weight of a hydroxyl or alkoxy endblocked polydiorganosiloxane having viscosity of between 1.0 and 100 Pa.s at 25° C. the organic groups being selected from the group consisting of methyl, ethyl, propyl, phenyl, and trifluoropropyl. (B) from 0.35 to 9.O parts by weight of an alkyltrialkoxysilane of the formula RSi(OR') 3 where R is a monovalent hydrocarbon radical of from 1 to 4 carbon atoms and R' is an alkyl or alkoxyalkyl radical. (C) from 0.5 to 5.0 parts by weight of titanium catalyst such that there is from 0.05 to O.94 part of titanium, (D) from 0 to 250 parts by weight of filler, (E) silane of the formula (MeO).sub.3 SiCH.sub.2 CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2 in an amount such that there is from 0.1 to 1.0 mole of silane per mole of titanium in (C), and (F) silane of the formula ##STR9## in an amount such that there is at least 25 percent on a molar basis of the amount of (E) present, and less than about 5 percent by weight based upon the weight of (A). then storing in the absence of moisture, to yield a sealant material that cures upon exposure to moisture and bonds to a large variety of substrates when cured.

Claim 17

A method of producing a one-part silicone sealant curable on exposure to moisture having improved adhesion to a variety of substrates when cured consisting essentially of mixing, in the absence of moisture, (A) 100 parts by weight of a hydroxyl or alkoxy endblocked polydiorganosiloxane having viscosity of between 1.0 and 100 Pa.s at 25° C. the organic groups being selected from the group consisting of methyl, ethyl, propyl, phenyl, and trifluoropropyl. (B) from 0.35 to 9.O parts by weight of an alkyltrialkoxysilane of the formula RSi(OR') 3 where R is a monovalent hydrocarbon radical of from 1 to 4 carbon atoms and R' is an alkyl or alkoxyalkyl radical. (C) from 0.5 to 5.0 parts by weight of titanium catalyst such that there is from 0.05 to O.94 part of titanium, (D) from 0 to 250 parts by weight of filler, (E) silane of the formula (MeO).sub.3 SiCH.sub.2 CH.sub.2 CH.sub.2 NHCH.sub.2 CH.sub.2 NH.sub.2 in an amount such that there is from 0.1 to 1.0 mole of silane per mole of titanium in (C), and (F) silane of the formula ##STR9## in an amount such that there is at least 25 percent on a molar basis of the amount of (E) present, and less than about 5 percent by weight based upon the weight of (A). then storing in the absence of moisture, to yield a sealant material that cures upon exposure to moisture and bonds to a large variety of substrates when cured.