Slow-release air freshener polymer-blend composition

• US 3,994,439 A
• Filed: 02/18/1975
• Issued: 11/30/1976
• Est. Priority Date: 02/20/1974
• Status: Expired due to Term

• Current Assignee: Sara Lee / De N.V. (Sara Lee Corporation)
• Original Assignee: Shell Oil Company (Shell Plc)
• Inventors: Nitters, Gerrit, Van Breen, Adriaan W.
• Primary Examiner(s): Turer, Richard B.
• Application Number:
  US05/550,482
• Time in Patent Office: 651 Days
• Field of Search: 260/876 B, 252/522, 239/54
• US Class Current: 239/54
• CPC Class Codes: A61L 9/042 with the help of a macromolecular compound as a carrier or diluent A61L9/048 takes precedence
• CPC Class Codes: C08K 11/00 Use of ingredients of unknown constitution, e.g. undefined reaction products
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 23/08 Copolymers of ethene C08L23/16 takes precedence
• CPC Class Codes: C08L 23/28 by reaction with halogens or compounds containing halogen C08L23/32 takes precedence
• CPC Class Codes: C08L 25/06 Polystyrene
• CPC Class Codes: C08L 27/06 Homopolymers or copolymers of vinyl chloride
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: Y10S 428/905 Odor releasing material

Abstract

Slow-release air freshener compositions having favorable depletion characteristics comprise an odorant (perfume) intimately dispersed in a polymeric mixture comprising 10-50% by weight of a certain block copolymer, 2-10% by weight polystyrene and 30-50% by weight of ethylene vinyl acetate copolymer.

Claims

1. A slow-release air freshener composition comparing from 5- 35% by weight perfume intimately dispersed in a polymeric mixture of

a. from 10- 50% by weight of a block copolymer having a general formula selected from the group consisting of A-B---A)_0-1, A---B-A)_2-5 or A-B---B-A)_2-5 wherein A is a polymer block of styrene or alpha-methyl styrene having a molecular weight of from 5,000 to 50,000, and B is a polymer block of butadiene or isoprene having a molecular weight of 40,000 to 500,000, the amount of A being in the range of 10-65% by weight of the total block copolymer;

b. from 2-10%w. of polystyrene; and

c. from 10-66% by weight of an ethylene vinyl acetate copolymer of the formula ##EQU1## wherein m is an integer from 1 to 30 and n is an integer from 15 to 250.

2. The composition of claim 1 wherein the block copolymer has the configuration polystyrene-polybutadiene-polystyrene.

3. The composition of claim 2 wherein the perfume content is 15-25% by weight.

4. The composition of claim 3 wherein the polymeric mixture contains 20-40% by weight of block copolymer, 3-8% by weight of polystyrene and 30-50% by weight of ethylene vinyl acetate copolymer.