Polymeric compositions for sustained release of volatile materials

• US 8,916,140 B2
• Filed: 09/21/2011
• Issued: 12/23/2014
• Est. Priority Date: 12/07/2005
• Status: Active Grant

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: MacBeath, Calum, Corzani, Italo, Mimassi, Lamia Delphine
• Primary Examiner(s): FISHER, ABIGAIL L
• Application Number:
  US13/238,473
• Publication Number:
  US 20120010122A1
• Time in Patent Office: 1,189 Days
• Field of Search: 424/76.4, 424/76.1, 424/76.2, 424/76.3, 523/102, 428/905, 239/60
• US Class Current: 424/76.4
• CPC Class Codes: C08K 2201/007 Fragrance additive
• CPC Class Codes: C08K 5/0008 Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
• CPC Class Codes: C08L 2205/025 containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 23/08 Copolymers of ethene C08L23/16 takes precedence
• CPC Class Codes: C08L 23/0846 Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
• CPC Class Codes: C08L 23/0853 Vinylacetate
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 2666/26 Natural polymers, natural resins or derivatives thereof according to C08L1/00 - C08L5/00, C08L89/00, C08L93/00, C08L97/00 or C08L99/00
• CPC Class Codes: C08L 93/02 Shellac French polish C09F
• CPC Class Codes: C09J 123/0853 Vinylacetate
• CPC Class Codes: C09J 131/04 Homopolymers or copolymers of vinyl acetate
• CPC Class Codes: C09J 2301/304 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
• CPC Class Codes: C11B 9/0061 compounds containing a six-membered aromatic ring not condensed with another ring
• CPC Class Codes: Y10S 428/905 Odor releasing material

Abstract

A polymeric composition comprising a copolymer of ethylene with at least another monomer comprising at least a heteroatom, a tackifier, less than 10% of a compatible plasticizer or blend of plasticizers and a volatile material. The compositions are able to deliver effectively the volatile material incorporated for a long time and also have good adhesion properties on most substrates.

Claims

1. A homogenous polymeric hot melt adhesive composition having a melting point of about 60°

C. to about 80°

C., comprising;

a) a copolymer of ethylene with vinyl acetate, a tackifier, which is a rosin that is solid at room temperature, and

b) up to 10% by weight of the total weight of the composition of a compatible plasticizer or blend of plasticizers,

c) a volatile material.

2. A polymeric composition according to any preceding claim wherein the copolymer is from 5% to 75% by weight of the polymeric composition, the tackifier is from 10% to 60% by weight of the copolymer and the volatile material is more than 10% of the total weight of the composition.

3. A polymeric composition of claim 1, wherein the composition is free of a compatible plasticizer.

4. A polymeric composition according to claim 1, wherein the volatile material is less than 90% of the total weight of the composition.

5. A polymeric composition according claim 1 wherein the volatile material is a perfume.

6. A polymeric composition according to claim 5 wherein the perfume comprises an aldehyde, a ketone, an alcohol, a terpene or an ester.

7. A polymeric composition according to claim 1 wherein the tackifier has a Tg higher than 50°

C.

8. A process for the manufacturing of a closed container comprising the steps of applying a polymeric composition according to claim 1 onto a portion of its internal surface.