Composition and process for making precipitated nylon-polyvinyl alcohol biconstituent composition
AssigneeAkzona Incorporated
InventorsNeal E. Franks, Julianna K. Varga
Life of this patent
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Abstract
A composition and process are provided for making precipitated biconstituent nylon-polyvinyl alcohol shaped articles by dissolving polyvinyl alcohol and a nylon having an amide group index of less than about 145 in a mixture of a tertiary amine oxide solvent and water, with the solution containing from about 3.0 to about 11% water, to form a biconstituent dispersion wherein the nylon and the polyvinyl alcohol comprise distinct separate phases. Shaped articles can be formed from the biconstituent dispersions of the invention.
Claims14
A biconstituent dispersion comprising:
- (A) a first distinct phase comprising a solution of
- (1) a nylon having an amide group index (molecular weight of repeating unit.div.number of amide groups per repeating unit) or less than 145,
- (2) a tertiary amine oxide nylon solvent which has an N-methylamine oxide group endo or exo to an aromatic or saturated or unsaturated ring and which has substantial stability at about 125.degree. C., and
- (3) a nylon solubility enhancing amount of water, and
- (B) a second distinct phase comprising a solution of
- (1) polyvinyl alcohol
- (2) a tertiary amine oxide polyvinyl alcohol solvent, and
- (3) a polyvinyl alcohol solubility enhancing amount of water.
A process for forming a biconstituent dispersion of a nylon and polyvinyl alcohol adapted for use in forming shaped biconstituent polymer articles which comprises:
- (A) separately forming a nylon solution comprising:
- (1) a nylon having an amide group index (molecular weight of repeating unit.div.number of amide groups per repeating unit) of less than about 145,
- (2) a tertiary amine oxide nylon solvent which has an N-methylamine oxide group endo or exo to an aromatic or saturated or unsaturated ring and which has substantial stability at about 125.degree. C., and
- (3) a nylon solubility enhancing amount of water,
- (B) separately forming a polyvinyl alcohol solution comprising:
- (1) polyvinyl alcohol
- (2) a tertiary amine oxide polyvinyl alcohol solvent which has an N-methylamine oxide group endo or exo to an aromatic or saturated or unsaturated ring and which has substantial stability at about 125.degree. C., and
- (3) a polyvinyl alcohol solubility enhancing amount of water
- (C) admixing said separately formed solutions at a temperature adapted to maintain the nylon and polyvinyl alcohol in solution to provide a biconstituent dispersion.
A process for forming a biconstituent dispersion of a nylon and polyvinyl alcohol adapted for use in forming shaped biconstituent polymer articles which comprises:
- (A) forming a nylon solution comprising:
- (a) a nylon having an amide group index (molecular weight of repeating unit.div.number of amide groups per repeating unit) of less than about 145,
- (2) a tertiary amine oxide nylon solvent which has an N-methylamine oxide group endo or exo to an aromatic or saturated or unsaturated ring and which has substatantial stability at about 125.degree. C., and
- (3) a nylon and polyvinyl alcohol solubility enhancing amount of water,
- (B) adding and dissolving therein polyvinyl alcohol thereby forming a biconstituent dispersion.
A process for forming a biconstituent dispersion of a nylon and polyvinyl alcohol adapted for use in forming shaped biconstituent polymer articles which comprises heating a mixture of:
- (a) a nylon hving an amide group index (molecular weight of repeating unit.div.number of amide groups per repeating unit) of less than about 145
- (b) polyvinyl alcohol
- (c) a tertiary amine oxide nylon and polyvinyl alcohol solvent which has an N-methylamine oxide group endo or exo to an aromatic or saturated or unsaturated ring and which has substantial stability at about 125.degree. C., and
- (d) a nylon and polyvinyl alcohol solubility enhancing amount of water to form a biconstituent dispersion.
Dependencies are inferred from the claim text.