Glass fiber reinforced vinyl chloride polymer products and proce

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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523212, 523213, 523214, 428251, 428288, 428290, 428291, 428391, 428392, 264142, C08K 900

Patent

active

048016276

ABSTRACT:
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 a particularly characterized basic film former. At the processing temperature of VC resin, containing a stabilizer against degradation during thermoforming, for example in an extruder, or on a mixing mill used to blend the resin with sized glass fibers, a reaction occurs between an aminosilane coupling agent and the VC resin which reaction involves C.dbd.C bonds in the homopolymer, provided the polymer film former in the size is more basic than poly(vinyl acetate) ("PVA"). The film former catalyzes the thermal dehydrohalogenation of the VC homopolymer at the fiber-resin interface so as to generate allylic Cl moieties in chains of the homopolymer, which moieties react with the amine groups of the aminosilane. The size is most conveniently coated on the fibers from a sizing solution, dispersion or emulsion containing the coupling agent and film former in which allylic Cl moieties in VC resin chains become covalently bonded to an aminosilane, so that even upon thorough extraction of a GFR VC composite with tetrahydrofuran (THF), sufficient bound VC resin remains so that X-ray photoelectron spectroscopic (XPS) examination indicates that the ratio of total chlorine to total carbon remaining on the surface of the glass fibers, i.e. the ratio of the areas of the "Cl(2p)/C(1s)" peaks, is at least 0.91.

REFERENCES:
patent: 4536360 (1985-08-01), Rahrig

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