Polymer resin polyvinyl formal

Epoxy resins may be blended with certain vinyl polymers to improve the impact strength and peel strength of the adhesive. Polyvinyl acetals, such as polyvinyl butyral and polyvinyl formal, and polyvinyl esters are compatible with DGEBA epoxy resins when added at concentrations of 10 to 20% by weight. The addition improves the resulting impact resistance and peel strength of the cured adhesive. However, temperature and chemical resistance are sacrificed by the addition of the low-glass-transition-temperature vinyl resins. 

PVCC. See Polyvinyl chloride, chlorinated PVC/PVA PVCA/A copolymer. See Vinyl chloride/vinyl acetate copolymer PVDC. See Polyvinylidene chloride PVDF. See Polyvinylidene fluoride resin PVE. See Polyvinyl ethyl ether PVF PVFM. See Polyvinyl formal PVI. See Polyvinyl isobutyl ether PVM. See Polyvinyl methyl ether PVM/MA. See PVM/MA copolymer PVM/MA copolymer CAS 9011-16-9 52229-50-2 Synonyms 2,5-Furandione, polymer with methoxyethene 2,5-Furandione, polymer with methoxyethylene Methyl vinyl ether/maleic anhydride copolymer Poly (maleic anhydride-methyi vinyl ether) Poly (methyl vinyl ether-alt-maleic anhydride)... 

In the waterborne phenolic adhesives, a new dispersion system (98) has been reported. This system uses the solubility of some thermoplastics in phenol, and the subsequent polymerization takes place upon the addition of formaldehyde, an emulsifier, and water. The dispersion is then formed in situ. The versatility of this process is indicated by the use of many polymers with a wide range of properties, e.g., polyvinyl formal, polyvinyl butyral, acrylonitrile-butadiene copolymer, bisphenol-A resins, polyvinyl acetate, polycarbonate, polymethyl methacrylate, and nylons. 

In most widely used two-polymer adhesives, the thermosetting component is phenolic. Phenolic resins are generally compatible, although not easily miscible, with a number of thermoplastic polymers. Particularly good compatibility is demonstrated between conventional alcohol-soluble phenolic resins and polyvinyl esters and acetals. Epoxies are important in two polymer adhesive systems. The most important thermoplastic components are the polyvinyl acetals (polyvinyl formal and butyral) and synthetic rubber, particularly nitrile rubber. Soluble nylons are also an important class. ... 

Vinyl resins (1934) n. According to common chemical nomenclature, all resins and polymers made from monomers containing the vinyl group, H2C=CHX. In the chemical literature, polystyrene, polyolefins, polymethyl methacrylate and many other styrenic, ethenic, and acrylic co-polymers are classified as vinyls. In the plastics literature, the above materials are given their own classifications and the term vinyl is restricted to compounds in which X, above, is not H, a hydrocarbon radical, nor an acrylic-type ester. In daily use, the term vinyl plastics refers primarily to polyvinyl chloride and its co-polymers, and secondarily to the following polyvinyl acetal, polyvinyl acetate, poly-vinyl alcohol, polyvinyl but-yral, poly(n-vinylcar-bazole), polyvinyl dichloride, polyvinyl formal, polyvinylidene chloride, polyisobutylvinyl ether, and poly (1-vinylpyrrolidone). Mishra MKM, Yagd Y (1998) Handbook of vinyl polymerization. Marcel Dekker, New York. 

Figure 1 Polymer interpretation chart. PAI, polyamideimide PC, polycarbonate UP, unsaturated polyester PDAP, diarylate phtalate resin VC-VAc, vinyl chloride-vinyl acetate copolymer PVAc, polyvinyl acetate PVFM, polyvinyl formal PUR, polyurethane PA, polyamide PMA, methacrylate ester polymer EVA, ethylene-vinyl acetate copolymer PF, phenol resin EP, epoxide resin PS, polystyrene ABS, acrylonitrile-butadiene-styrene copolymer PPO, polyphenylene oxide P-SULFONE, poly-sulfone PA, polyamide UF, urea resin CN, nitrocellulose PVA, polyvinyl acetate MC, methyl cellulose MF, melamine resin PAN, polyacrylonitrile PVC, polyvinyl chloride PVF, polyvinyl fluoride CR, polychloroprene CHR, polyepichlorohydrin SI, polymethylsiloxane POM, polyoxy-methylene PTFE, polytetrafluoroethylene MOD-PP, modified PP EPT, ethylene-propylene terpolymer EPR, ethylene-propylene rubber PI, polyisoprene BR, butyl rubber PMP, poly(4-methyl pentene-1) PE, poly(ethylene) PB, poly(butene-l). (Adapted from Ref. 22, p. 50.)...

Reaction of PVOH with butyraldehyde or formaldehyde gives products of commercial significance. Two of these are polyvinyl butyral (PVB) and polyvinyl formal. These are examples of useful resins made by modifying modified polymers. The latter is made into a varnish for coating wire and cable, and the former is extruded into sheet. Large quantities of PVB are used for the energyabsorbing layer in auto windshields. 

Adhesives which incorporate phenol-formaldehyde resins are much used as structural adhesives for metals. They comprise the original polyvinyl formal/PF, and polyvinyl butyral/PF together with nitrile phenolics and epoxy phenolics. The ratio of non-phenolic polymer to the PF resin in the structural adhesives determines the morphology of the material, whether it is two-phased, and which phase is continuous and which discrete. This, in turn, influences the flexibility of the... 

---