Sizing composition and sized strand useful as reinforcement
AssigneePPG Industries, Inc.
InventorGary A. Pollman
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Abstract
Sizing compositions having polyurethane latex, cationic silane having unsaturation and polyamino silane are provided. The compositions are used to treat glass fibers to produce sized glass fibers having improved physical properties such as integrity. The sized glass fibers when used with molding compounds yields molded articles with improved physical properties like tensile strength, flexural strength and articles with impact strength.
Claims13
Glass fiber strand for use as reinforcement with molding compounds having a dried residue of an aqueous sizing composition where the dried residue constitutes 0.2 percent to 3 percent of said glass fiber strand and, said aqueous sizing composition comprises in weight percent of the aqueous sizing composition:
- 2 to 40 weight percent of curable polyurethane latex as the sole polymeric film former, 0.05 to about 2 weight percent of a cationic silane having unsaturation, and about 0.05 to about 2.0 weight percent of polyamine silane, and water in the remaining amount.
The method of forming glass fiber strand for use as reinforcement with molding compounds to produce molded articles, which comprises drawing glass streams from orifices in a bushing to form individual glass fibers;
- moving the fibers 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 and before strand formation an aqueous sizing solution;
- comprising:
- about 2 to about 40 weight percent of curable polyurethane latex as the sole polymeric film former, about 0.05 to about 2.0 weight percent of cationic silane with unsaturation and about 0.05 to about 2.0 weight percent of a polyamine silane, and water in an amount to give a solids content from about 1 to about 20 weight percent where all the weight percentages are based on the total sizing composition;
- drying the strand so formed and chopping said strands.
Dependencies are inferred from the claim text.