Packaging and containers made of water-soluble polyamides and processes for their manufacture
AssigneeE.I. du Pont de Nemours and Company
InventorRolando U. Pagilagan
Life of this patent
Estimating the term…
Abstract
Packaging materials made from water-soluble nylons are disclosed, that readily contain materials such as caustic chemicals and upon exposure to water dissolve to provide for the release of the chemical into an aqueous environment. The materials are made from select polyether diamines and select aliphatic dicarboxylic acids.
Claims17
A packaging material comprising a water-soluble polyamide with a solubility in water at 23 C. of at least 1.0 weight percent and derived from the reaction of adipic acid and ether diamines with a molecular weight of 148 to 396 and represented by the general formulas
- H2N—R1—O—R2—O—R1—NH2
- wherein R1 and R2 are either —CH2—CH2— or —CH2—CH2—CH2—;
- H2N—R1(—O—CH2—CH2—)XO—R1—NH2
- wherein R1 is either —CH2—CH2— or —CH2—CH2—CH2—
- and X has an average value of 2 to 6;
- and mixtures thereof.
A process for the manufacture of water-soluble polyamide packaging materials comprising:
- (i) Forming a water-soluble polyamide as a film, said polyamide having an RV of less than 50, preferably between 10 and 35, solubility in water at 23 C. of at least 1.0 weight percent and at such a rate that a 5-10 mil film will dissolve in less than an hour, preferably in less than 30 minutes, and derived from the reaction of adipic acid and ether diamines with a molecular weight of 148 to 396 and represented by the general formulas
- H2N—R1—O—R2—O—R1—NH2
- wherein R1 and R2 are either —CH2—CH2— or —CH2—CH2—CH2—;
- H2N—R1(—O—CH2—CH2—)XO—R1—NH2
- wherein R1 is either —CH2—CH2— or —CH2—CH2—CH2—
- and X has an average value of 2 to 6;
- and mixtures thereof;
- (ii) Shaping said film so formed in step (i) into a container suitable for placement therein of a material of interest;
- (iii) Depositing within said container formed in step (ii) the material of interest;
- and
- (iv) Sealing said container so that the material of interest is retained therewithin.
- (v)
A process for the manufacture of packaging for materials of interest by including water-soluble polyamide interspersed therewithin comprising:
- (i) Presenting the material to be packaged;
- (ii) Interspersing with the material presented in step (i) a water-soluble polyamide having a solubility in water at 23 C. of at least 1.0 weight percent and derived from the reaction of adipic acid and ether diamines with a molecular weight of 148 to 396 and represented by the general formulas
- H2N—R1—O—R2—O—R1—NH2
- wherein R1 and R2 are either —CH2—CH2— or —CH2—CH2—CH2—;
- H2N—R1(—O—CH2—CH2—)XO—R1—NH2
- wherein R1 is either —CH2—CH2— or —CH2—CH2—CH2—
- and X has an average value of 2 to 6;
- and mixtures thereof, and
- (iii) Shaping the material in step (i) as interspersed with water-soluble polyamide in step (ii) into a solid form suitable for the application of interest.
Dependencies are inferred from the claim text.