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AssigneeImperial Chemical Industries PLC
InventorsPaul A. Holmes, Frank M. Willmouth, Alan B. Newton
Estimating the term…
Polymer blends containing (i) 0.2-95% by weight of a high molecular weight .beta.-hydroxybutyric acid homo- or copolymer and (ii) a polymer containing at least 25% by weight of chlorine or nitrile groups, such as chlorinated polyethylene, polyvinyl chloride, or a high acrylonitrile resin. In small quantities the .beta.-hydroxybutyric acid polymer acts as a processing aid for the chlorine or nitrile containing polymer. In larger quantities the properties of the .beta.-hydroxybutyric acid polymer or the chlorine or nitrile containing polymer are improved.
A polymer blend comprising (i) 0.2 to 95% by weight of a .beta.-hydroxybutyric acid polymer of molecular weight above 50,000 and containing 100 to 50 mole % of .beta.-hydroxybutyric acid residues and correspondingly 0-50 mole % of .beta.-hydroxyvaleric acid residues in the polymer chain, and (ii) an organic polymer containing at least 25% by weight of chlorine and/or nitrile groups.
Dependencies are inferred from the claim text.