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US3881026A Expired / Lapsed US ⏱️ 0.0 years remaining

Powdered water-insoluble polymers containing absorbed additives

Assignee: National Patent Development Corp
•
Filing: 1971-06-14
•
Granted: 1975-04-29
•
Expires: 1991-06-14
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Abstract

Abstract A process for preparing hydrophilic homopolymers and products prepared thereby, said process comprising admixing in a solventfree system in the presence of a free radical, vinyl polymerization catalyst. Shaped bodies can be prepared in the form of articles which can be cast with additives such as fragrances, medicinals, flavors, chemicals and the like, which are gradually released from the article when it is wetted in water or alcohol. Liquid casting syrups adapted to be polymerized in situ with with or without additives can be formed. The casting syrups can be prepared in water to yield a polymer soluble in alcohol which is suitable for formation of hydrophilic coatings as by spray, dip, casting and the like. Polymerization to solvent soluble polymers is accomplished in the presence of a suspending medium.

Inventors

  • 👤 Thomas T Shepherd
  • 👤 Francis E Gould

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 04:29
CPC Classifications
A; A61; A61Q; A61Q19/00; A23; A23L; A23L27/00; A23L27/70; A23L27/74; A23P; A23P10/00; A23P10/30; A24; A24D; A24D3/00; A24D3/06; A24D3/08; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8141; A61K8/8152; A61K9/00; A61K9/20; A61K9/2004; A61K9/2022; A61K9/2027; A61K9/70; A61L; A61L9/00; A61L9/015; A61L9/04; A61L9/042; A61Q11/00; A61Q13/00; C; C08; C08F; C08F120/00; C08F120/02; C08F120/10; C08F120/26; C08F120/28; C11; C11B; C11B9/00; A61K2800/00; A61K2800/40; A61K2800/56; A61Q17/00; A61Q17/005; Y; Y10; Y10S; Y10S521/00; Y10S521/905

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 66 words
A POWDER FOR CONTROLLED RELEASE OF AN ADDITIVE UPON INCURRING WETTING WITH WATER OR ALCOHOL PREPARED BY THE PROCESS OF GRINDING TO A POWDER A HARD, FRIABLE FOAM OF WATERINSOLUBLE POLYMER OF A MONOESTER OF THE GROUP CONSISTING OF HYDROXYETHYL ACRYLATE, HYDROXYPROPYL ACRYLATE, HYDROXYETHYL METHACRYLATE AND HYDROXYPROPYL METHACRYLATE HAVING ABSORBED THEREIN AFTER POLYMERIZATION OF AN ADDITIVE, SAID POLYMER BEING SUBSTANTIALLY COMPLETELY POLYMERIZED IN A WATERFREE STATE.
Claim 2
Dependent Claim 66 words
A POWDER FOR CONTROLLED RELEASE OF AN ADDITIVE UPON INCURRING WETTING WITH WATER OR ALCOHOL PREPARED BY THE PROCESS OF GRINDING TO A POWDER A HARD, FRIABLE FOAM OF WATERINSOLUBLE POLYMER OF A MONOESTER OF THE GROUP CONSISTING OF HYDROXYETHYL ACRYLATE, HYDROXYPROPYL ACRYLATE, HYDROXYETHYL METHACRYLATE AND HYDROXYPROPYL METHACRYLATE HAVING ABSORBED THEREIN AFTER POLYMERIZATION OF AN ADDITIVE, SAID POLYMER BEING SUBSTANTIALLY COMPLETELY POLYMERIZED IN A WATERFREE STATE.
Claim 3
Dependent Claim 12 words
A powder according to claim 1 wherein the monoester is hydroxyethyl acrylate.
Claim 4
Dependent Claim 16 words
A powder according to claim 1 wherein the additive is a flavoring agent or fragrance agent.
Claim 5
Dependent Claim 17 words
A POWDER ACCORDING TO CLAIM 3 WHEREIN THE FLAVORING AGENT OR FRAGRANCE AGENT IS AN ESSENTIAL OIL.
Claim 6
Dependent Claim 14 words
A powder according to claim 1 wherein the polymer is an organic solvent-soluble polymer.

References Cited (Backward Citations)

US3567118A Cited
US3576760A Cited
US3681248A Cited
US3681089A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-04-28 1978-10-28 1979-04-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-04-28 1982-10-28 1983-04-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-04-28 1986-10-28 1987-04-29 $7700.00 Window Closed / Lapsed

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