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EP0200197A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method for impregnating a thermoplastic polymer

Assignee: Hercules LLC
•
Filing: 1986-04-29
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Granted: —
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Expires: 2006-04-29
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Abstract

Abstract Disclosed is a method for impregnating a thermoplastic polymer with an impregnation material such as a fragrance or pest control agent or pharmaceutical composition. A thermoplastic polymer is impregnated by 1) dissolving an impregnation material such as a fragrance or pest control agent or pharmaceutical composition material in a volatile swelling agent maintained at or near supercritical conditions for the volatile swelling agent, 2) swelling the thermoplastic polymer by contacting it at or near supercritical conditions for the volatile swelling agent with the impregnation material-laden volatile swelling agent and then 3) reducing the pressure so that the volatile swelling agent diffuses out of the thus impregnated thermoplastic polymer.

Inventors

  • 👤 Michael Leonard Sand

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-24 04:48
CPC Classifications
B; B29; B29C; B29C71/00; A; A61; A61K; A61K9/00; A61K9/70; A61K9/7007; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/042; C; C08; C08J; C08J7/00; C08J7/04; C08J7/06; C08J7/065; D; D06; D06M; D06M23/00; D06M23/10; D06M23/105; B29C71/0009; B29C2071/0018; B29C2071/0054; B29K; B29K2105/00; B29K2105/0005; B29K2105/0011; B29K2105/0029; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/54

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 116 words
A method for impregnating a solid with an impregnation material by contacting the solid with a volatile solvent in which the impregnation material is dissolved and then the pressure is reduced, characterized in that the solid is a thermoplastic polymer and the solvent is also a swelling agent for the polymer, the polymer is contacted with and swollen by the solvent containing the impregnation material in solution at or near the supercritical conditions of temperature and pressure of the solvent, and the pressure is reduced to diffuse the solvent out of the swollen thermoplastic polymer, the impregnation material being a fragrance or pest control agent or pharmaceutical agent and being less volatile than the volatile solvent.
Claim 2
Independent Claim 116 words
A method for impregnating a solid with an impregnation material by contacting the solid with a volatile solvent in which the impregnation material is dissolved and then the pressure is reduced, characterized in that the solid is a thermoplastic polymer and the solvent is also a swelling agent for the polymer, the polymer is contacted with and swollen by the solvent containing the impregnation material in solution at or near the supercritical conditions of temperature and pressure of the solvent, and the pressure is reduced to diffuse the solvent out of the swollen thermoplastic polymer, the impregnation material being a fragrance or pest control agent or pharmaceutical agent and being less volatile than the volatile solvent.
Claim 3
Dependent Claim 25 words
An impregnation method as claimed in claim 1, further characterized in that the volatile solvent/swelling agent is lipophilic, and the impregnation material is fat- soluble.
Claim 4
Dependent Claim 23 words
An impregnation method as claimed in claim 1 or 2, further characterized in that the swelling agents is carbon dioxide or nitrous oxide.
Claim 5
Dependent Claim 31 words
An impregnation method as claimed in claim 1, 2 or 3, further characterized in that the impregnation material is musk, rose oil, honeysuckle oil, pine oil, and jasmine or oak musk.
Claim 6
Dependent Claim 24 words
An impregnation method as claimed in claim 1, 2 or 3, further characterized in that the impregnation material is a pheromone or a pyrethrin.
Claim 7
Dependent Claim 20 words
An impregnation method as claimed in claim 1, 2 or 3, further characterized in that the impregnation material is scopolamine.

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