Patent GB-1121460-A (GB)
Title: Protective coating materials for glass fibres
IPC: C03C25/255
Filed: 1966-09-08
Abstract: Coating materials, particularly for protecting and lubricating glass fibres during working thereof, comprise 10-80% by weight, based on the total solids, of a wax, and 20-90% of a polysaccharide stabilizer having a hydrophilic main chain and one or more lipophilic side chains, and a non-waxy water-soluble polymeric film-former, the wax being distributed throughout the stabilizer and film-former as particles not larger than 10m .  The different functions need not be fulfilled by separate components. The stabilizing polysaccharide may be the starch fractions amylose and amylopectin, a polyuronide, or others (specified) in particular propylene glycol alginate, and the non-waxy film-former may be one of the fore-going, or whole starch, gelatine or polyvinyl alcohol.  The wax may be paraffin wax of M.Pt. above 120 DEG  F. (preferred), beeswax, carnauba, ceresin, mineral, Japan, vegetable or microcrystalline wax.  The coating may also include up to 30% of a cationic glass lubricant, e.g. comprising an imidazoline modified polyester (the reaction product of diethylene glycol, maleic acid, diethylene triamine and stearic acid disclosed in U.S.A. Specification 3,097,963), or octadecyl amine acetate or a quaternary ammonium product. The coating is preferably applied to glass fibres as an aqueous dispersion consisting of 1-7% by weight coating material and the balance water.ALSO:Coating materials, particularly for protecting and lubricating glass fibres during working thereof, comprise 10-80% by weight, based on the total solids, of a wax, and 20-90% of a polysaccharide stabiliser having a hydrophilic main chain and one or more lipophilic side chains, and a non-waxy water-soluble polymeric film former, the wax being distributed throughout the stabiliser and film former as particles not larger than 10m . The different functions need not be fulfilled by separate components.  The stabilising polysaccharide may be the starch fractions amylose and amylo-pectin, a polyuronide, or others (specified), in particular propylene glycol alginate, and the non-waxy film former may be one of the foregoing, or whole starch, gelatin or polyvinyl alcohol.  The wax may be paraffin wax of MPt above 120 DEG F (preferred), beeswax, carnauba, ceresin, mineral, Japan, vegetable or microcrystalline wax.  The coating may also include up to 30% of a cationic glass lubricant e.g. comprising an imidazoline modified polyester (the reaction product of diethylene glycol, maleic acid, diethylene triamine and stearic acid disclosed in U.S. 3,097,963), or octadecyl amine acetate or a quaternary ammonium product.  The coating is applied to the glass fibres during their formation from molten glass, preferably as an aqueous dispersion consisting of 1-7% by weight coating material and the balance water; a belt or apron applicator may be used. The fibres are composed of 100-1240 continuous filaments of less than 0.001 in diameter, and the coating, which constitutes only 0.2-1.5% by weight thereof, serves as a lubricant, to resist inter-fibrous abrasion, and to assist texturising.  It is removed from the woven fabric by heating to 1000 DEG F.  Specification 1,121,459 is referred to.