Patent ID: 6107435
Filing Date: 2000-08-22
Classification: C08K

Abstract:
A RTV composition, curable in the presence of moisture, comprising(A) about 20 to 95 weight percent polymers comprising on average at least 1.2 hydroxysilyl chain terminations per molecule described by formula--SiR.sup.9.sub.2 OH, (I)or on average at least 1.2 alkoxysilyl chain terminations per molecule described by formula--SiR.sup.9.sub.x (OR).sub.3-x, (II)where each R is an independently selected alkyl radical comprising 1 to about 8 carbon atoms, each R.sup.9 is independently selected from the group consisting of monovalent hydrocarbon radicals comprising 1 to about 18 carbon atoms and monovalent halohydrocarbon radicals comprising 1 to about 18 carbon atoms, and x is 0 or 1;(B) about 0.05 to 1.4 weight percent of a titanium compound;(C) a sufficient amount of an aminofunctional alkoxysilane described by formulaX.sub.2 N--R.sup.6 --SiR.sup.7.sub.y (OR.sup.8).sub.3-yto provide a nitrogen concentration from about 0.01 to 2 weight percent, where R.sup.6 is selected from the group consisting of divalent hydrocarbon radicals comprising about 2 to 18 carbon atoms and divalent halohydrocarbon radicals comprising about 2 to 18 carbon atoms, each R.sup.7 is an independently selected monovalent hydrocarbon radical comprising 1 to about 18 carbon atoms, each R.sup.8 is an independently selected alkyl radical comprising 1 to about 6 carbon atoms, each X is independently selected from the group consisting of hydrogen, monovalent hydrocarbon radicals comprising 1 to about 18 carbon atoms, and a group expressed by formula --R.sup.6 --NX.sub.2, where R.sup.6 and X are as defined above, and y is 0, 1, or 2;(D) about 0.5 to 40 weight percent of an alkoxysilane described by formulaR.sup.7.sub.z Si(OR.sup.8).sub.4-z ;where each R.sup.7 is an independently selected monovalent hydrocarbon radical comprising 1 to about 18 carbon atoms, each R.sup.8 is an independently selected alkyl radical comprising 1 to about 6 carbon atoms, and z is 0, 1, or 2, provided that when Component (A) comprises polymers comprising on average at least 1.2 hydroxysilyl chain terminations per molecule z is not 2; and(E) about 3 to 40 weight percent of a silica filler.