Size for forming glass fibers having a reduced tendency to give gumming deposits

Claim 1

A sizing composition to treat glass fibers to produce a glass fiber strand with a reduced tendency to form gummy deposits on fabrication machinery under high relative humidity conditions, comprising in weight percent based on the non-aqueous components in the sizing composition: (a) about 50 to about 65 of a starch having cross-links that has been partially cooked at a temperature in the range of about 220° F. to about 250° F. in a jet cooker at a pressure of 90 to about 110 psi and cooled to around 190° F., (b) 4 to 52 percent of the salt of a polyaminofunctional polyamide resin, said polyaminofunctional polyamide resin salt being formed from the condensation reaction product of a polycarboxylic acid and a polyamine, said polyamine having greater than 2 amine groups per molecule and a carboxylic acid having 1 to 5 carbon atoms, (c) 5 to 25 of a wax selected from the group consisting of animal waxes, vegetable waxes, mineral waxes and synthetic waxes; (d) 9 to 77 percent of a fatty triglyceride; (e) an amount of ethylene oxide derivative of sorbitol ester to prepare an emulsion of the wax and triglyceride; (f) 1.5 to 20 of gamma-methacryloxypropyltrimethoxysilane, and (g) 5 to 45 of an alkyl imidozaline.