DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS To describe the invention in further detail, the organosilanes or organosiloxanes as the first component in the primer composition are expressed by the above-mentioned formula, in which the alkylene groups having 1 to 4 carbon atoms denoted by R.
sup.
1 are exemplified by methylene, ethylene, propylene and butylene groups; the substituted or unsubstituted monovalent hydrocarbon groups denoted by R.
sup.
2 are exemplified by alkyl groups, such as, methyl, ethyl and propyl groups, and cycloalkyl, alkenyl, cycloalkenyl, aryl, halogen-substituted hydrocarbon and cyano-substituted hydrocarbon groups; the hydrolyzable atoms or groups denoted by X besides a hydroxy group are exemplified by alkoxy groups, such as, methoxy and ethoxy groups, acyloxy groups, such as, acetoxy groups, aminoxy and oxime groups.
Illustrative of the mercapto-containing silanes or siloxanes useful in the composition of the invention are the following.
They are used either singly or in combination of two or more.
##STR1## Next, the titanic acid esters as the second component to form the primer compositions of the present invention are exemplified by the following examples.
Tetraethyl titanate, tetraisopropyl titanate, tetra(2-ethylhexyl) titanate, tetraphenyl titanate, tetra(2-methoxyethoxy) titanate and diisopropyldiacetoxy titanate and condensates of the partial hydrolyzates or cohydrolyzates of these titanates.
They are employed either singly or in combination of two or more.
The above described first and second components of the primer composition in accordance with the present invention are employed in the proportions of from 2 to 98 parts by weight, preferably from 10 to 90 parts by weight of the former to from 98 to 2 parts by weight, preferably from 90 to 10 parts by weight of the latter.
The primer compositions of the present invention are applied to surfaces preferably in the form of dilutions with one or more solvents selected from the group consisting of alcohols, such as, methyl, ethyl and isopropyl alcohols, aromatic hydrocarbons such as, benzene, toluene and xylene, chlorinated, hydrocarbons, such as, trichloroethylene and perchloroethylene, aliphatic hydrocarbons, such as, hexane, ketones, such as, acetone and methylethyl ketone, and esters, such as, ethylacetate
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