Modified polymers having controlled transmission rates

• US 6,124,006 A
• Filed: 05/29/1998
• Issued: 09/26/2000
• Est. Priority Date: 04/19/1995
• Status: Expired due to Term

• Current Assignee: CSP Technologies North America LLC (AptarGroup Incorporated)
• Original Assignee: Capitol Specialty Plastics Incorporated
• Inventors: Hekal, Ihab M.
• Primary Examiner(s): Silbaugh, Jan H.
• Assistant Examiner(s): McDowell, Suzanne E.
• Application Number:
  US09/087,830
• Time in Patent Office: 851 Days
• Field of Search: 206/204, 34/95, 34/329, 502/402, 502/405, 53/400, 53/428, 53/111, 264/DIG. 78, 264/250, 264/259, 264/510, 264/173.16, 264/268, 264/165, 264/299, 264/176.1, 264/255, 252/194, 428/613, 428/34.1, 428/35.7
• US Class Current: 428/34.1
• CPC Class Codes: B01J 20/28014 characterised by their form
• CPC Class Codes: B01J 20/28033 Membrane, sheet, cloth, pad, lamellar or mat
• CPC Class Codes: B01J 20/28042 Shaped bodies; Monolithic structures
• CPC Class Codes: B29C 45/16 Making multilayered or multicoloured articles B29C45/0062 takes precedence; feeding colouring materials into the injection unit B29C45/1816
• CPC Class Codes: B65D 81/264 for absorbing liquids
• CPC Class Codes: B65D 81/266 for absorbing gases, e.g. oxygen absorbers or desiccants B65D51/244, B65D51/30 take precedence
• CPC Class Codes: C08J 9/26 by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
• CPC Class Codes: F26B 21/083 by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
• CPC Class Codes: Y10T 428/12479 Porous [e.g., foamed, spongy, cracked, etc.]
• CPC Class Codes: Y10T 428/13 Hollow or container type article [e.g., tube, vase, etc.]
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]

Abstract

The present invention includes processes and resulting structures for producing a modified polymer having channels. The channels act as controlled transmission passages through the polymer. A polymer is caused to assume a molten state, typically by applying heat and melting the polymer. A channeling agent is blended then reacted into the polymer so that it is distributed within the polymer. In one embodiment, an absorbtion additive is blended into the product so that the additive is distributed within the product. The product is solidified so that the channeling agent forms passages in the product through which a desired compound is communicable to the additive that is entrained within the product. The solidified product may be used to form a desired shaped article such as plug type inserts and liners for closed containers, or it may be formed into a film, sheet, bead or pellet.

Claims

1. An article of manufacture comprising a shaped article formed by:

(a) mixing at least about 20% by weight of a polymer, between about 10% to about 70% by weight of an absorption additive and at least about 5% by weight of a channeling agent, wherein the percent by weight of each component is based on the total weight of the three components;

(b) heating the mixture at a temperature at least above the melt point of the channeling agent so that the absorption additive and channeling agent are distributed within the polymer;

(c) cooling the mixture to form a shaped article having a channel morphology in the polymer wherein the channels are composed of the channeling agent and wherein the absorption additive is primarily concentrated within the channeling agent.

3. The article of claims 1 or 2, wherein the article is a container.

2. An article of manufacture comprising a shaped article formed by:

(a) heating at least about 20% by weight of a polymer;

(b) mixing between about 10% to about 70% by weight of an absorption additive and at least about 5% by weight of a channeling agent with the polymer material at a temperature at least above the melt point of the channeling agent, wherein the percent by weight of each component is based on the total weight of the three components; and

(c) cooling the blend to form a shaped article having a channel morphology in the polymer wherein the channels are composed of the channeling agent and wherein the absorption additive is primarily concentrated within the channeling agent.

4. An article of manufacture comprising a monolithic composition formed by:

(a) mixing at least about 20% by weight of a polymer, between about 10% to about 70% by weight of a desiccating agent and at least about 5% by weight of a channeling agent, wherein the channeling agent is a hydrophilic material and the percent by weight of each component is based on the total weight of the three components;

(b) heating the mixture at least above the melt point of the channeling agent so that the absorption additive and channeling agent are distributed within the polymer; and

(c) cooling the mixture to form a shaped article having a channel morphology in the polymer wherein the channels are composed of the channeling agent and wherein the absorption additive is primarily concentrated within the channeling agent.

6. The article of claims 4 or 5, wherein the article is in a form of a sheet.

7. The article of claims 4 or 5, wherein the article is extruded into a shaped article.

8. The article of claims 4 or 5, wherein the absorbtion additive is selected from the group consisting of a silica gel, molecular sieve and clay.

9. The article of claims 4 or 5, wherein the article is a container.

10. The article of claims 4 or 5, wherein the polymer is a thermoplastic.

11. The article of claims 4 or 5, wherein the channeling agent is selected from the group consisting of a polyglycol, glycerin, ethylene-vinyl alcohol and polyvinyl alcohol.

12. The article of claims 4 or 5, wherein the article is in the form of a disc.

13. The article of claims 4 or 5, wherein the article is in the form of a film.

14. The article of claims 4 or 5, wherein the article is in a form of a sleeve.

15. The article of claims 4 or 5, wherein the article is in a form of beads.

5. An article of manufacture comprising a monolithic composition formed by:

(a) mixing a polymer selected from the group consisting of polyolefins, polycarbonates and polyamides;

between about 10% to about 70% by weight of an absorption additive; and

a channeling agent selected from the group consisting of polyglycol, glycerin, ethylene-vinyl alcohol and polyvinyl alcohol;

(b) heating the mixture at least above the melt point of the channeling agent so that the absorption additive and channeling agent are distributed within the polymer; and

(c) cooling the mixture to form a monolithic composition having a channel morphology in the polymer wherein the channels are composed of the channeling agent and wherein the absorption additive is primarily concentrated within the channeling agent.

16. An article of manufacture comprising a monolithic composition formed by:

(a) mixing a polymer, a channeling agent, and between about 10% to about 70% by weight of an absorption additive, wherein the percent by weight of each component is based on the total weight of the three components;

(b) exposing the mixture to a temperature at least above the melt point of the channeling agent so that the absorption additive and channeling agent are distributed within the polymer; and

(c) forming a monolithic composition having a channel morphology in the polymer wherein the channels are composed of the channeling agent and wherein the absorption additive is primarily concentrated within the channeling agent.

17. The article of claim 16, wherein:

(a) the polymer is selected from the group consisting of polyolefins, polycarbonates and polyamides; and

(b) the channeling agent is selected from the group consisting of polyglycol, glycerin, ethylene-vinyl alcohol and polyvinyl alcohol.

18. An article of manufacture comprising a monolithic composition formed by:

(a) mixing at least about 20% by weight of a polymer, between about 10% to about 70% by weight of an absorption additive and at least about 5% by weight of a channeling agent, wherein the percent by weight of each component is based on the total weight of the three components;

(b) exposing the mixture to a temperature at least above the melt point of the channeling agent so that the absorption additive and the channeling agent are distributed within the polymer; and

(c) cooling the mixture to form a monolithic composition having a channel morphology in the polymer wherein the channels are composed of the channeling agent and wherein the absorption additive is primarily concentrated within the channeling agent.