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US 3,949,015 AGranted
Internally plasticized poly(vinyl chloride)
AssigneeGeneral Motors Corporation
InventorsJohn J. Laverty, Zachariah G. Gardlund
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AssigneeGeneral Motors Corporation
InventorsJohn J. Laverty, Zachariah G. Gardlund
Estimating the term…
Macroazonitrile molecules formed of flexible poly(ethylene oxide) segments connected by azo linkages are heated in the presence of vinyl chloride to initiate the addition polymerization of the monomer onto the ends of the poly(ethylene oxide) segments. An ABA type block copolymer is formed wherein the A parts are poly(vinyl chloride) segments and B is a poly(ethylene oxide) block which was originally part of the macroazonitrile. The flexible poly(ethylene oxide) segments of this block serve as an internal (intramolecular) plasticizer such that the copolymer may be used in applications typically filled by externally plasticized poly(vinyl chloride). External plasticizers are still required but their concentrations may be reduced to a level where plasticizer migration problems are eliminated.
A flexible poly(vinyl chloride) molded article comprising by weight,
An ABA type block copolymer having a torsional stiffness below about 36.degree. C. wherein said A blocks each consist essentially of poly(vinyl chloride) having a molecular weight (Mn) in the range of from 15,000 to 20,000 and said B block consists essentially of poly(ethylene oxide) having a molecular weight (Mn) in the range of from 6,000 to 20,000.
A flexible sheet molding compound having a torsional stiffness below about 20.degree. C. comprising, by weight, 100 parts of an ABA type block copolymer wherein said A blocks each consist essentially of poly(vinyl chloride) having a molecular weight (Mn) in the range of from 15,000 to 20,000 and said B block consists essentially of poly(ethylene oxide) having a molecular weight (Mn) in the range of from 6,000 to 20,000, and from 5 to 40 parts of a plasticizer.
A block copolymer having the general formula
A plasticized poly(vinyl chloride) composition suitable for use in applications requiring thin, flexible and strong materials comprising by weight,
Dependencies are inferred from the claim text.