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The invention is a composition comprising a) one or more organotitanates having four ligands wherein the ligands are hydrocarbyl, optionally containing one or more functional groups having one or more heteroatoms selected from the group comprising oxygen, nitrogen, phosphorus and sulfur wherein two

The invention is a composition comprising a) one or more organotitanates having four ligands wherein the ligands are hydrocarbyl, optionally containing one or more functional groups having one or more heteroatoms selected from the group comprising oxygen, nitrogen, phosphorus and sulfur wherein two or more of the ligands may form a cyclic structure; b) one or more mercaptosilanes; c) one or more polyaminosilanes; d) one or more secondary aminosilanes; and e) a solvent which dissolves the components of the composition. The composition also includes an organotin compound f). This composition is referred to as a clear primer hereinafter. In another embodiment the invention is a system for bonding glass to a substrate which comprises a clear primer according to the invention; and an adhesive comprising an isocyanate functional prepolymer and a catalyst for the cure of the isocyanate functional prepolymer.

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What is claimed is: 1. A composition comprising: a) one or more organotitanates or organozirconates having four ligands wherein the ligands are hydrocarbyl, optionally containing one or more functional groups having one or more heteroatoms selected from the group comprising oxygen, nitrogen, phosph

What is claimed is: 1. A composition comprising: a) one or more organotitanates or organozirconates having four ligands wherein the ligands are hydrocarbyl, optionally containing one or more functional groups having one or more heteroatoms selected from the group comprising oxygen, nitrogen, phosphorus and sulfur wherein two or more of the ligands may form a cyclic structure; b) one or more mercaptosilanes; c) one or more polyaminosilanes; d) one or more secondary aminosilanes; e) one or more solvents which dissolve the components of the composition; and f) one or more organotin compounds selected from the group consisting of one or more alkyl tin oxides, stannous alkanoates, dialkyl tin carboxylates, tin mercaptides, dialkyltin di(acetylacetonate) and mixtures thereof in an amount of from about 0.00001 to about 20 percent by weight based on the weight of the composition; wherein the components are contained in one solution. 2. A composition according to claim 1 wherein the organotin compound comprises one or more stannous alkanoates, dialkyl tin carboxylates, dialkyltin di(acetylacetonate) or mixtures thereof. 3. A composition according to claim 1 wherein the organotin compound is present in an amount of from about 0.0006 to about 1.0 percent by weight based on the weight of the formulation. 4. A composition according to claim 1 wherein the organotin compound comprises one or more dialkyltin di(acetylacetonates). 5. A composition according to claim 1 wherein the organotitanate or organozirconate corresponds to the formula M(—OR1)4 wherein M is Ti or Zr, R1 is independently in each occurrence hydrocarbyl, hydrocarbyl carboxyl, hydrocarbyl sulfonyl, hydrocarbyl amino, phosphato hydrocarbyl, pyrophosphato hydrocarbyl, with the proviso that two or more of R1 may combine to form a cyclic ring structure. 6. A composition according to claim 1 which comprises: a) from about 0.08 to about 45 percent by weight of one or more organotitanates or organozirconates; b) from about 0.03 to about 59 percent by weight of one or more mercapto-silanes; c) from about 0.005 to about 16 percent by weight of one or more polyaminosilanes; d) from about 0.01 to about 16 percent by weight of one or more secondary aminosilanes; e) from about 30 to about 99.5 percent by weight of one or more solvents; and f) from about 0.00001 to about 20 percent by weight of one or more organotin compounds; wherein the weight percents stated are based on the weight of the total composition. 7. The composition according to claim 1 wherein the weight ratio of b) one or more mercaptosilanes to c) one or more polyaminosilanes to d) one or more secondary aminosilanes is from about 10:1.0:0.40 to about 1.0:1.0:1.0.