Glass fibers coated with silicon containing aminimide compounds

A glass fiber bundle formed of a plurality of glass fibers, each of the glass fibers having a thin size coating thereon, said coating formed from a compound having the formula ##EQU59## wherein R.sub.1 and R.sub.2 are each alkyl containing 1 to 6 carbon atoms;

• R.sub.5 is selected from the group consisting of alkyl, aryl, cycloalkyl, alkenyl and acryloxyalkyl and methacryloxyalkyl, R.sub.5 containing 1 to 20 carbon atoms;
• R.sub.6 and R.sub.7 are each selected from the group consisting of alkoxy containing 1 to 5 carbon atoms, R.sub.5 and hydrogen;
• and R.sub.8 is selected from the group consisting of hydrogen, alkyl containing 1 to 8 carbon atoms and a group of the formula
• --CH.sub.2 -- O -- R.sub.4
• wherein R.sub.4 is selected from the group consisting of phenyl;
• phenyl substituted with an amino group, a halogen group or an alkyl group;
• alkyl containing 1 to 20 carbon atoms;
• alkenyl containing 2 to 8 carbon atoms and a group of the formula ##EQU60## where R' is hydrogen or methyl.

In a glass fiber reinforced elastomeric product wherein an elastomeric material constitutes a continuous phase in which the glass fibers are distributed, the improvement in the bonding relationship between the glass fibers and the elastomeric material comprising a coating on the glass fibers, said coating formed from a compound having the formula ##EQU63## wherein R.sub.1 and R.sub.2 are each alkyl containing 1 to 6 carbon atoms;

• R.sub.5 is selected from the group consisting of alkyl, aryl, cycloalkyl, alkenyl and acryloxyalkyl and methacryloxyalkyl, R.sub.5 containing 1 to 20 carbon atoms;
• R.sub.6 and R.sub.7 are each selected from the group consisting of alkoxy containing 1 to 5 carbon atoms, R.sub.5 and hydrogen;
• and R.sub.8 is selected from the group consisting of hydrogen, alkyl containing 1 to 5 carbon atoms and a group of the formula
• -- CH.sub.2 -- O -- R.sub.4
• wherein R.sub.4 is selected from the group consisting of phenyl;
• phenyl substituted with an amino group, a halogen group or an alkyl group;
• alkyl containing 1 to 20 carbon atoms;
• alkenyl containing 2 to 8 carbon atoms and a group of the formula ##EQU64## where R' is hydrogen or methyl.

In a glass fiber reinforced plastic product wherein a thermosetting or thermoplastic resin constitutes a continuous phase in which the glass fibers are distributed, the improvement in the bonding relationship between the glass fibers and the resin comprising a coating on the glass fibers, said coating formed from a compound having the formula ##EQU65## wherein R.sub.1 and R.sub.2 are each alkyl containing 1 to 6 carbon atoms;

• R.sub.5 is selected from the group consisting of alkyl, aryl, cycloalkyl, alkenyl and acryloxyalkyl and methacryloxyalkyl, R.sub.5 containing 1 to 20 carbon atoms;
• R.sub.6 and R.sub.7 are each selected from the group consisting of alkoxy containing 1 to 5 carbon atoms, R.sub.5 and hydrogen;
• and R.sub.8 is selected from the group consisting of hydrogen, alkyl containing 1 to 8 carbon atoms and a group of the formula
• -- CH.sub.2 -- O -- R.sub.4
• wherein R.sub.4 is selected from the group consisting of phenyl;
• phenyl substituted with an amino group, a halogen group or an alkyl group;
• alkyl containing 1 to 20 carbon atoms;
• alkenyl containing 2 to 8 carbon atoms and a group of the formula ##EQU66## where R' is hydrogen or methyl.