Starch-oil sizing for glass fibers
AssigneePPG Industries, Inc.
InventorsGarry D. Puckett, Ernest L. Lawton, Xiang Wu
Life of this patent
Estimating the term…
Abstract
An aqueous starch-oil sizing composition is provided which produces improved processibility in woven and non-woven applications. The sizing has low viscosity starch, a lubricant which is a mixture of oil and wax where the wax is present in an amount of at least twice the oil, cationic lubricants, and a humectant. The size also includes an organo-functional silane coupling agent such as gamma-glycidoxypropyltrimethoxy silane which may be hydrolyzed. Emulsifiers, defoamers, and biocides may be present. Strands of glass fiber which have been treated with this size have generally shown a reduced tendency to shed the size from the strands, a reduction in the buildup of broken filaments or "fuzz" on processing equipment and reduced strand breakage.
Claims14
An aqueous sizing composition for glass fibers comprising, in addition to water:
- a single low viscosity starch having a post-cook viscosity of 100 centipoise or less at 100.degree. F. at a 6 percent solids level;
- a nonionic lubricant which is a mixture of oil and wax wherein the wax is present in an amount of at least twice the amount of the oil on a weight basis;
- a cationic lubricant;
- a humectant;
- and
- at least one silane coupling agent.
An aqueous sizing composition for glass fibers comprising, in addition to water:
- between about 40 and 65 weight percent on a non-aqueous basis of a single low viscosity starch having a post-cook viscosity of 100 centipoise or less at 100.degree. F. at a 6 percent solids level;
- between about 15 and 45 weight percent on a non-aqueous basis of a nonionic lubricant which is a mixture of partially hydrogenated soybean oil and paraffin was wherein the wax is present in an amount of at least twice the amount of the oil on a weight basis;
- between about 1 and 10 weight percent on a non-aqueous, active ingredient basis, of a cationic lubricant;
- between about 1 and about 10 weight percent on a non-aqueous basis of an emulsifier which has an HLB of about between 8 and 20 and is an ethylene oxide derivative of sorbitol ester;
- between about 2 and 15 weight percent on a non-aqueous basis of a humectant which is polyethylene glycol;
- and
- between about 0.5 and 8 weight percent on a non-aqueous basis of at least one coupling agent selected from the group consisting of hydrolyzed silanes and non-hydrolyzed silanes and mixtures thereof.
Dependencies are inferred from the claim text.