Glass fiber size

Claim 2

The method of claim 1 wherein the size contains 0.2 to 4 percent by weight of a glass fiber textile lubricant.

Claim 3

In the method of forming a glass fiber strand which can be used as a reinforcement for resins and elastomers which comprises drawing glass streams through orifices in a bushing to form individual glass fibers, moving the fibers away from the bushing at a high rate of speed and forming them into a strand, applying to the fibers while they are moving at this speed an aqueous sizing solution, drying the sized glass fibers and preparing them for use as a reinforcement, the improvement, whereby the sized glass fibers exhibit improved wetting by resins, which comprises sizing the glass with an aqueous size consisting essentially of 2 to 15 percent by weight of a polyolefin emulsion selected from the group consisting of polypropylene and polyethylene-polypropylene mixtures, wherein the polypropylene is present from about 25 to about 100 percent by weight of the polyolefin and the polyethylene is present from about 0 to about 75 percent by weight of the polyolefin, a coupling agent and a textile lubricant, the viscosity of the size being less than 100 centipoises at 20* C. and thereafter coating it with an aqueous elastomeric adhesive composition containing an elastomer latex and a heat curable resin, then drying the adhesive coated strand to remove the water and thereafter curing the resin by the application of additional heat.

Claim 4

The method of claim 4 wherein the size contains 0.1 to 2 percent by weight of a coupling agent.

Claim 5

The method of claim 4 wherein the size contains 0.2 to 4 percent by weight of a glass fiber textile lubricant.

Claim 6

Glass fiber strand having disposed upon the glass fibers in an amount from about 0.2 to about 2.0 percent by weight of the glass a dried residue of an aqueous size comprising, when applied, 2 to 15 percent by weight of a polyolefin emulsion selected from the group consisting of polypropylene and polyethylene-polypropylene mixtures, wherein the polypropylene is present from about 25 to about 100 percent by weight of the polyolefin and the polyethylene is present from about 0 to about 75 percent by weight of the polyolefin, a coupling agent and a textile lubricant and having disposed about said dried residue upon the glass fibers an elastomeric adhesive composition.

Claim 7

Glass fiber strand according to claim 7 wherein the size, when applied, contains 0.1 to 2 percent by weight of a coupling agent.

Claim 8

Glass fiber strand according to claim 7 wherein the size, when applied, contains 0.2 to 4 percent by weight of a glass fiber textile lubricant.