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A fiber size composition contains a modified polyolefin, a hydrophilic coupling agent, a boron-containing, fluorine-containing compound, a blend of at least two fatty acids and a compound selected from phosphorus(V) compounds and sulfur(VI) compounds, the fiber size composition being substantially f

A fiber size composition contains a modified polyolefin, a hydrophilic coupling agent, a boron-containing, fluorine-containing compound, a blend of at least two fatty acids and a compound selected from phosphorus(V) compounds and sulfur(VI) compounds, the fiber size composition being substantially free of conventional lower oxidation state antioxidants and optical brighteners. Composite materials produced from reinforcing fiber materials sized with a fiber size composition according to the invention exhibit improved properties such as, for example, increased strength and/or improved color stability.

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We claim: 1. A fiber size composition comprising: 1) a modified polyolefin; 2) a hydrophilic coupling agent; 3) two or more size enhancing compounds selected from the group consisting of a) one or more fatty acids selected from the group consisting of cyclic fatty acids and fatty dimer diacids; b)

We claim: 1. A fiber size composition comprising: 1) a modified polyolefin; 2) a hydrophilic coupling agent; 3) two or more size enhancing compounds selected from the group consisting of a) one or more fatty acids selected from the group consisting of cyclic fatty acids and fatty dimer diacids; b) boron compounds; c) one or more fluorine compound selected from alkali metal fluorides, alkali metal tetrafluoroaluminates, alkali metal hexafluorozirconates and hexafluorosilicates; d) fluoro-boro compounds; and e) hydrophobic coupling agents; and 4) an additive selected from sulfur(VI) compounds alone or in combination with a member selected from the group consisting of P(III) compounds, P(V) compounds and a mixture of P(III) compounds and P(V) compounds. 2. The fiber size composition according to claim 1, wherein: the fiber size composition is an aqueous emulsion. 3. The fiber size composition according to claim 1 wherein: the modified polyolefin is a nonionic aqueous polymer emulsion, the modified polyolefin being modified by the addition of a substituent selected from the group consisting of maleic acid, acrylic acid, methacrylic acid, maleic anhydride, acrylic anhydride, methacrylic anhydride and oxiranes. 4. The fiber size composition according to claim 3 wherein: the modified polyolefin is a maleic anhydride modified polypropylene having a molecular weight of at least about 10,000. 5. The fiber size composition according to claim 3 wherein: the modified polyolefin is a maleic anhydride modified polypropylene having a molecular weight of at least about 80,000. 6. The fiber size composition according to claim 1, wherein: the fluoro-boro compound is a tetrafluoroborate. 7. The fiber size composition according to claim 1, wherein: the fluoro-boro compound is a tetrafluoroborate selected from the group consisting of alkaline earth tetrafluoroborates, ammonium tetrafluoroborate and mixtures thereof. 8. The fiber size composition according to claim 7, wherein: the tetrafluoroborate is selected from the group consisting of potassium tetrafluoroborate, ammonium tetrafluoroborate and mixtures thereof. 9. The fiber size composition according to claim 8, wherein: the tetrafluoroborate is ammonium tetrafluoroborate. 10. The fiber size composition of claim 1 wherein: one of the two or more size enhancing compounds includes a boron compound selected from the group consisting of borohydrides, boron halides, boron nitride, organoboron compounds, borazoles, perborates, borosilicates, boric acid and mixtures thereof. 11. The fiber size composition of claim 10 wherein: the boron compound includes boric acid. 12. The fiber size composition of claim 1 wherein: the boron compound includes a tetraborate. 13. The fiber size composition of claim 12 wherein: the tetraborate is selected from the group consisting of dipotassium tetraborate, diammonium tetraborate and mixtures thereof. 14. The fiber size composition of claim 1, further comprising: a polyurethane. 15. A reinforcing fiber comprising: a mineral fiber; and a size composition layer formed on a majority of a surface area of the mineral fiber, wherein the size composition layer includes, 1) a modified polyolefin; 2) a hydrophilic coupling agent; 3) two or more enhancers selected from the group consisting of a) one or more fatty acids selected from the group consisting of cyclic fatty acids and fatty dimer diacids; b) boron compounds; c) one or more fluorine compound selected from alkali metal fluorides, alkali metal tetrafluoroaluminates, alkali metal hexafluorozirconates and hexafluorosilicates; d) fluoro-boro compounds; and e) hydrophobic coupling agents; and 4) S(VI) compounds alone or in combination with a member selected from the group consisting of P(III) compounds, P(V) compounds and a mixture of P(III) compounds and P(V) compounds. 16. The reinforcing fiber according to claim 15, wherein: one enhancer includes a hydrophobic silane coupling agent. 17. The reinforcing fiber according to claim 16, wherein: the hydrophobic silane coupling agent is selected from the group consisting of alkylsilanes, vinylsilanes and mixtures thereof. 18. A composite, fiber reinforced product comprising: a polymer matrix; and reinforcing fibers distributed throughout the polymer matrix, wherein the reinforcing fibers include a substantially complete layer of a size composition, and further wherein the size composition includes, 1) a modified polyolefin; 2) a hydrophilic coupling agent; 3) two or more enhancers selected from the group consisting of a) one or more fatty acids selected from the group consisting of cyclic fatty acids and fatty dimer diacids; b) boron compounds; c) one or more fluorine compound selected from alkali metal fluorides, alkali metal tetrafluoroaluminates, alkali metal hexafluorozirconates and hexafluorosilicates; d) fluoro-boro compounds; and e) hydrophobic coupling agents; and 4) an additive selected from sulfur(VI) compounds alone or in combination with a member selected from the group consisting of P(III) compounds, P(V) compounds and a mixture of P(III) compounds and P(V) compounds. 19. The composite, fiber reinforced product according to claim 18, wherein: one of the enhancers includes a hydrophobic silane coupling agent. 20. The reinforcing fiber according to claim 19, wherein: the hydrophobic silane coupling agent is selected from the group consisting of alkylsilanes, vinylsilanes and mixtures thereof. 21. A fiber size composition comprising: a modified polyolefin; a hydrophilic coupling agent; a compound selected from the group consisting of boron compounds and fluorine compounds and mixtures thereof; a blend of at least two fatty acids, said blend including at least one saturated fatty acid having at least two fatty acid groups; and an additive selected from S(VI) compounds alone or in combination with a member selected from the group consisting of P(III) compounds, P(V) compounds and a mixture of P(III) compounds and P(V) compounds. 22. The fiber size composition of claim 21, wherein: the hydrophilic coupling agent includes one or more aminosilanes. 23. The fiber size composition of claim 21, wherein: the fatty acids include a compound selected from the group consisting of C8-C40 alkyl chain fatty acids, lower alkyl acids and mixtures thereof. 24. The fiber size composition of claim 23, wherein: the fatty acids include a lower alkyl acid selected from the group consisting of succinic acid, propionic acid and butyric acid. 25. The fiber size composition of claim 21, wherein: the hydrophilic coupling agent includes an aminosilane; and the additive includes both a P(III) compound and a P(V) compound, the P(III) and P(V) compounds being included at a molar ratio of from 1:1 to 10:1. 26. The fiber size composition of claim 21, wherein: the hydrophilic coupling agent includes an aminosilane; and the additive includes both a P(III) compound and a P(V) compound, the P(III) and P(V) compounds being included at a molar ratio of from 10:1 to 100:1. 27. The fiber size composition of claim 21, wherein: the hydrophilic coupling agent includes an aminosilane; and the additive includes a P(V) compound selected from the group consisting of aromatic alcohol phosphates, aromatic phosphoric acid esters, aromatic phosphoric acid ester salts, fatty alcohol phosphates and ethoxylated phosphates. 28. The fiber size composition of claim 21, wherein: the hydrophilic coupling agent includes an aminosilane; and the additive includes a S(VI) compound selected from the group consisting of sulfuric acid (H2SO4), Al2SO4, NaHSO4, (NH4)HSO4, (NH4)2SO4 and mixtures thereof.