Glass fiber sizing compositions for the reinforcement of resin matrices
Patent 4029623 Issued on June 14, 1977. Estimated Expiration Date: 
June 14, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 14, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2133238 2763573 2846348 2951772 3082183 3414432 3437517 3464942 3684467 InventorAssigneeApplicationNo. 05/606272 filed on 08/20/1975US Classes:523/503, Organic nitrogen DNRM523/504, Organic chalcogen DNRM525/168, Polycarboxylic acid or derivative, polyol, or other coreactant contains an ethylenic group; or wherein a condensate thereof has been prepared from a polycarboxylic acid or derivative and a polyol and subsequently reacted with an ethylenic reactant525/170, Solid polymer derived from ethylenic reactants only derived from at least one reactant containing an oxygen atom525/447, Solid polymer derived from polycarboxylic acid or derivative and a polyhydroxy compound derived from reactant containing ethylenic unsaturation525/448Solid polymer derived from polycarboxylic acid or derivative and polyhydroxy compound is derived from two or more polycarboxylic acids or derivativesExaminersPrimary: Welsh, M. J.Attorney, Agent or FirmAbstractA glass fiber sizing composition for the reinforcement of resin matrices is provided which comprises a homogeneous aqueous composition of two polyester resins. The first polyester resin is a water solubilized condensation cross-linkable, polyester resin, insoluble in aromatic solvents. The second polyester resin is insoluble but dispersible in water but insoluble in the first polyester resin. Thus, when the second polyester is blended with a water solution of the first polyester, a dispersion is produced. In this dispersion the water and the first polyester form the continuous phase and the second polyester forms the dispersed phase. A plasticizer and two silane coupling agents are also incorporated into the sizing composition. The first coupling agent is provided to promote adhesion between the glass fibers and the resin matrix and the second silane coupling agent is employed in the sizing composition to control the wetting of the glass fibers by the first silane coupling agent. A thermoplastic polymer of sufficiently low molecular weight is employed to impart pressure sensitive adhesive characteristics to the sizing composition. Glass fibers sized with the sizing composition of the invention have found particular utility when incorporated into resin matrices which are utilized as molding compounds. | |
