Patent EA-001952-B1 (EA)
Title: Nonaqueous sizing system for glass fibers and injection moldable polymers
Inventor: ADZIMA LEONARD J
IPC: C03C25/40
Filed: 1998-06-05
Abstract: 1. A nonaqueous sizing composition for application to glass reinforcing fibers comprising: a) one or more film formers that are miscible with the polymer to be reinforced, the film former having a melting point in the range of from 30-60 degree C., and a viscosity of from 75-400 cPs and b) one or more coupling agents selected from the group consisting of silanes; 2. The nonaqueous sizing composition of claim 1, wherein said coupling agent is selected from the group consisting of 3-glycidoxypropyltrimethoxy silane, 3-methacryloxypropyltrimethoxy silane and 3-aminopropyltriethoxy silane. 3. The nonaqueous sizing composition of claim 1, wherein said film formers are selected from the group consisting of polyamide, polypropylene, polybutyl, terathalate, polyamide having a carbon chain containing 6 carbon atoms, polyamide having a repeating unit comprising two carbon chains, each chain containing 6 carbon atoms, chemically coupled polypropylene, polycarbonate, polyphenalene sulfide, thermoplastic polyurethane, acetal, and HDPE. 4. The nonaqueous sizing composition of claim 1, wherein said film formers are selected from the group consisting of high m.w. waxes, lower m.w. waxes, lower m.w. polyester alkyds, polycaprolactones, low m.w. maleated polypropylenes. 5. A nonaqueous sizing for application to glass fibers for reinforcing polyamide comprising: a) one or more film formers that are miscible with the polymer to be reinforced, the film former having a melting point in the range of from 30-60 degree C., and a viscosity of from 75-400 cPs and b) one or more coupling agents selected from the group consisting of silanes. 6. The nonaqueous sizing of claim 5, wherein said film former is selected from the group consisting of low m.w. polyurethanes, polycaprolactones, polyesters, unsaturated polyesters. 7. The nonaqueous sizing of claim 5, wherein said film formers are polycaprolactones; and said coupling agent is amine silane. 8. A nonaqueous sizing composition for application to glass fibers for reinforcing polypropylene comprising: a) one or more film formers that are miscible with the polymer to be reinforced, the film former having a melting point in the range of from 30-60 degree C., and a viscosity of from 75-400 cPs and b) one or more coupling agents selected from the group consisting of silanes. 9. The nonaqueous sizing of claim 8, wherein said film former is selected from the group consisting of amorphous waxes, microcrystaline waxes, maleated low molecular weight polypropylenes, hydrocarbon resins. 10. The nonaqueous sizing of claim 8, wherein said film formers are amorphous waxes and said coupling agent is amine silane. 11. Glass fibers having at least a portion of their surfaces covered with the dried residue of a nonaqueous sizing composition according to claim 1. 12. The glass fiber of claim 11, wherein said nonaqueous sizing composition is the composition defined in claim 7. 13. The glass fiber of claim 11, wherein said nonaqueous sizing composition is the composition defined in claim 10. 14. Glass fibers of claim 11 wirecoated with polymer selected from the group consisting of polyamide, polypropylene, polycarbonate, polybutylterphalate. 15. A process for producing a glass fiber containing molding compound comprising the steps of: (a) forming glass fiber strand; (b) coating said glass fiber strand with the nonaqueous sizing composition of claim 1 and (c) applying a wirecoating of polymer resins.