Claims
- 1. 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.
- 2. 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.
- 3. 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.
- 4. The gas-barrier polymer blend of claim 3 where the blend contains from about 5% to about 30% by weight of one or more additional thermoplastic polymers that are compatible with the continuous phase.
- 5. The gas-barrier polymer blend of claim 3 where the blend contains from about 20% to about 30% by weight of one or more additional thermoplastic polymers that are compatible with the continuous phase.
Parent Case Info
This is a division of application Ser. No. 843,784, filed Feb. 28, 1992, now U.S. Pat. No. 5,208,083, which was a division of application Ser. No. 438,371, filed Nov. 16, 1989, now U.S. Pat. No. 5,147,930.
US Referenced Citations (11)
Foreign Referenced Citations (6)
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May 1975 |
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Divisions (2)
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Number |
Date |
Country |
Parent |
843784 |
Feb 1992 |
|
Parent |
438371 |
Nov 1989 |
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