Back to results
US 4,536,360 AGranted
Glass fiber reinforced vinyl chloride polymer products and process for their preparation
AssigneeThe B. F. Goodrich Company
InventorDouglas B. Rahrig
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeThe B. F. Goodrich Company
InventorDouglas B. Rahrig
Estimating the term…
Vinyl chloride (VC) resins, particularly poly(vinyl chloride) (PVC) and chlorinated poly(vinyl chloride) (CPVC) are reinforced with glass fibers which have been sized with a particular aminosilane coupling agent and an alkylene oxide-containing film former. This combination of sizing components, among all others, generates allylic Cl atoms in the VC chain of the polymer. Though the VC resin contains an adequate amount of stabilizer to counter the formation of such allylic Cl atoms in the mass of the resin, enough are generated near the surface of the glass to cause a reaction with the aminosilane so as to bond the glass fibers to the VC resin so strongly that a composite only fails in coherent failure. The sizing consists essentially of (i) an aminosilane coupling agent having a reactive amine moiety which upon reaction with the VC resin results in a compound having a peak in a proton magnetic resonance spectra at 5.65 ppm, and (ii) a film former consisting essentially of a polymer having a ring-opened lower alkylene oxide containing from about 2 to about 4 carbon atoms as an essential component in a repeating unit optionally containing another copolymerizable component. The wet strength of the composite is about equal to or greater than the dry strength of an identical composite which has no film former in the sizing.
A thermoplastic composition of vinyl chloride resin and glass fibers particularly well-adapted to be thermoformed, comprising a mixture of,
In a process for pelletizing vinyl chloride homopolymer and glass fibers, the improvement comprising,
A shaped article formed from a composite of a vinyl chloride resin in which the vinyl chloride portion of each repeating unit contains from about 57% to about 72% by wt chlorine, reinforced with glass fibers and containing a stabilizer, in which composite said resin is present in an amount in the range from about 50 percent to about 95 percent by weight (% by wt) based on the combined weight of glass fibers and resin in the composite, and the glass fibers are present in an amount in the range from about 5% to about 50% by wt and have a diameter less than about 20 microns, and are coated with a size consisting essentially of
Dependencies are inferred from the claim text.