| 摘要 |
<p>Sized glass fiber strands are provided, that have an improved slip/flow property and resultant thermosetting articles reinforced with the sized glass fiber strands have improved impact properties. The aqueous sizing composition has a poly(vinyl acetate) silane copolymer, epoxy polymer, one or more lubricants, an organo silane coupling agent, which may be an amino-silane coupling agent, lubricant modified-amino-organo silane coupling agent, epoxy-containing silane coupling agent vinyl-containing silane coupling agent or a mixture of one or more of these coupling agents, one or more nonionic surfactants, a polyethylene-containing polymer and/or a wax, a hydrocarbon acid and water. Polyethylene polymer is present in an amount of about 0 to about 25 weight percent of the solids of the aqueous sizing composition. The wax is present in an amount of about 0 to about 5 weight percent solids of the aqueous sizing composition. The amount of the hydrocarbon acid present is that sufficient to give a pH for the composition in the range of about 4 to around 9. The amount of water present in the aqueous sizing composition is that sufficient to give a total solids for the composition of about 1 to about 30 weight percent. The sized glass fiber strands have good choppability in that there is not a high amount of fly or fuzz produced during the chopping operation. The sized glass fiber strands in any form may be used for reinforcing thermosetting polymeric material.</p> |
