Glass fiber sizing, sized glass fibers and polyolefin reinforced articles

An aqueous sizing composition for glass fibers, comprising:

• a) an aminofunctional organosilane coupling agent and hydrolysis products thereof in an amount ranging from about 5 weight percent to about 25 weight percent;
• b) an aqueous emulsion of a carboxylic acid modified polypropylene film forming material in an amount ranging from about 50 weight percent to about 90 weight percent;
• and
• c) a stabilizer, in an amount ranging from about 2 weight percent to about 20 weight percent, selected from the group consisting of:
• i) phosphinates selected from the group consisting of alkali metal phosphinates, alkaline earth metal phosphinates, ammonium phosphinate, organic phosphinates and mixtures thereof;
• ii) phosphonites selected from the group consisting of alkali metal phosphonites, alkaline earth metal phosphonites, ammonium phosphonite, organic phosphonites and mixtures thereof;
• iii) phosphites selected from the group consisting of alkali metal phosphites, alkaline earth metal phosphites, ammonium phosphite, organic phosphites and mixtures thereof;
• iv) hypophosphites selected from the group consisting of alkali metal hypophosphites, alkaline earth metal hypophosphites, ammonium hypophosphite and mixtures thereof;
• v) sulfites selected from the group consisting of alkali metal sulfites, alkaline earth metal sulfites, ammonium sulfite and mixtures thereof.
• vi) bisulfites selected from the group consisting of alkali metal bisulfites, alkaline earth metal bisulfites, ammonium bisulfite and mixtures thereof;
• and
• vii) mixture of one or more of the stabilizers of i through vi with an antioxidant selected from the group consisting of hindered phenols, diarylamines, thioethers and mixtures thereof, the percentages based on the weight of total solids of the aqueous sizing composition.