Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1987-10-23
1989-09-26
Kendell, Lorraine T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
428361, 428391, 428392, 428288, 428290, 428378, 523209, 523213, 523214, 524494, B32B 2700, C08K 900, C08K 906, D04H 158
Patent
active
048701262
ABSTRACT:
A high temperature PVC resin blend is made by blending from 60 to 85 parts PVC with no more than 40 parts of a ("alpha-SAN") copolymer of alpha-methyl styrene ("AMS"), styrene ("S") and acrylonitrile ("AN") and less than 20 parts by wt additives including stabilizers, antioxidants, lubricants, and processing aids. In addition, an impact modifier may be added. The blend with particularly sized glass fibers, may be thermoformed at an elevated processing temperature and pressure, to provide a reinforced composite in which the PVC is covalently bonded to the glass fiber. The composite has a substantially higher HDT and equivalent tensile strength, compared to that of a similarly reinforced, unblended PVC composite, without sacrificing the novel composite's other desirable physical properties. The glass is sized with an aminosilane coupling agent, and, a polymer film former selected from the group consisting of (i) a polymer with a nitrogen-containing repeating unit such as an amine, amide, ureido, or urethane group, and (ii) a dispersible or emulsifiable epoxide polymer, which composite, upon extraction with THF, and a subsequent XPS examination, yields a Cl(2p)/C(1s) ratio of at least 0.91, and more preferably of at least 1.13. Glass fibers, thus sized, provide cohesive bonding of the resin, so the composite fails in cohesive failure. A unique sequence of mixing the blend ingredients with glass fiber provides optimum properties in the composite. The sequence requires formation of a single phase of PVC and alpha-SAN copolymer before dispersing the glass fibers in the blend.
REFERENCES:
patent: 3053800 (1962-09-01), Grabowski et al.
patent: 3671378 (1972-06-01), Baer et al.
patent: 4536360 (1985-08-01), Rahrig
Faber Edward M.
Kinson Philip L.
Csontos Alan A.
Kendell Lorraine T.
Lindsay James R.
Lobo Alfred D.
The B. F. Goodrich Company
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