Polymer blends with enhanced properties
AssigneeRohm and Haas Company
InventorsEdward E. La Fleur, Robert M. Amici, William T. Freed, William J. Work, William G. Carson
Life of this patent
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Abstract
Polymer blends of a) polymers containing predominantly mers of (meth)acrylates and/or glutarimides with b) up to about 40 weight percent of polymers having greater than 50 mol % vinyl alcohol mers exhibit useful barrier properties to oxygen and other environmental gases, while maintaining or enhancing physical properties and clarity.
Claims5
A gas-barrier polymer blend comprising
- a) from about 20% to about 95% by weight of a first polymer containing at least 50 mole percent mers of one or both of lower alkyl (meth)acrylates and glutarimides of the formula ##STR2## wherein R.sup.1 and R.sup.2 are selected from H and lower alkyl, and R.sup.3 is selected from hydrogen, alkyl, aryl, alkaryl and aralkyl and forming a continuous phase,
- b) from about 2.5% to about 40% by weight of a second polymer having at least 50 mole percent vinyl alcohol mers which is either miscible with, or forms a discontinuous phase in, the continuous phase, wherein the permeability to oxygen of the blend is 10% or less of the permeability of the first polymer alone, in the form of a laminar film or sheet having one or more additional layers, and
- c) up to about 75% by weight of one or more additional thermoplastic polymers that are compatible with the continuous phase.
The process for protecting materials from environmental gases which comprises sealing the materials in a polymeric sheet, film, wrapping, or container formed from a gas-barrier polymer blend comprising:
- a) from about 20% to about 95% by weight of a first polymer containing at least 50 mole percent mers of one or both of lower alkyl (meth)acrylates and glutarimides and forming a continuous phase, and
- b) from about 2.5% to about 40% by weight of a second polymer having at least 50 mole percent vinyl alcohol mers which is either miscible with, or forms a discontinuous phase, in the continuous phase wherein the permeability to oxygen of the blend is 10% or less of the permeability of the first polymer alone.
A gas-barrier polymer blend comprising
- a) from about 20% to about 95% by weight of a first polymer containing at least 50 mole percent mers of one or both of lower alkyl (meth)acrylates and glutarimides and forming a continuous phase, and
- b) from about 2.5% to about 40% by weight of a second polymer having at least 50 mole percent vinyl alcohol mers which is either miscible with, or forms a discontinuous phase in, the continuous phase wherein the permeability to oxygen of the blend is 10% or less of the permeability of the first polymer alone, and where the blend contains up to about 75% by weight of one or more additional thermoplastic polymers that are compatible with the continuous phase.
Dependencies are inferred from the claim text.