Glass fiber sizing compositions, sized glass fibers, and polyolefin composites

A polyolefin composite, comprising:

• (a) a plurality of glass fibers at least partially coated with a sizing composition comprising a film-former comprising a polymer, wherein the repeating unit of the polymer comprises four to six carbon atoms and one carbon-carbon double bond, in an amount between about 60 and about 90 weight percent on a total solids basis and a silane comprising a terminal vinyl group in an amount between about 5 and about 25 weight percent on a total solids basis;
• and
• a polyolefin prepared by combining (a) a cyclic olefin;
• (b) a metathesis catalyst for polymerizing the cyclic olefin;
• (c) 0.1-30 wt. % of a compound comprising at least one vinyl group;
• and (d) 0.1-10 wt. % of a curing agent for compound (c) to form a curable composition, and subjecting the curable composition to conditions effective to promote an olefin metathesis reaction of the cyclic olefin and a radical polymerization of compound (c);
• or
• (b) a plurality of glass fibers at least partially coated with a sizing composition consisting essentially of a film-former comprising a polymer, wherein the repeating unit of the polymer comprises four to six carbon atoms and one carbon-carbon double bond;
• a silane comprising a terminal vinyl group;
• and one or more surfactants;
• and
• a polyolefin prepared by combining (a) a cyclic olefin;
• (b) a metathesis catalyst for polymerizing the cyclic olefin;
• (c) 0.1-30 wt. % of a compound comprising at least one vinyl group;
• and (d) 0.1-10 wt. % of a curing agent for compound (c) to form a curable composition, and subjecting the curable composition to conditions effective to promote an olefin metathesis reaction of the cyclic olefin and a radical polymerization of compound (c).