Method for preparation of block copolymeric nanoparticles

• US 7,166,306 B2
• Filed: 02/04/2003
• Issued: 01/23/2007
• Est. Priority Date: 02/05/2002
• Status: Expired due to Fees

• Current Assignee: Rohm and Haas Company (Dow, Inc.)
• Original Assignee: Rohm and Haas Company (Dow, Inc.)
• Inventors: Peng, Huisheng, Jiang, Ming, Chen, Daoyong
• Primary Examiner(s): Richter; Johann
• Assistant Examiner(s): George; Konata M.
• Application Number:
  US10/357,979
• Publication Number:
  US 20030229185A1
• Time in Patent Office: 1,449 Days
• Field of Search: 424/489, 424/78.08, 424/78.17, 428/402
• US Class Current: 424/489
• CPC Class Codes: C08F 293/005 using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
• CPC Class Codes: C08J 3/14 by precipitation from solutions C08J3/122 takes precedence
• CPC Class Codes: C08J 3/24 Crosslinking, e.g. vulcanising, of macromolecules mechanical aspects B29C35/00; crosslinking agents C08K
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers

Abstract

A method for preparation of block copolymeric nanoparticles is disclosed. The method is a single-step preparation in which block copolymeric nanoparticles are produced directly from a solution of crosslinkable block copolymer in a carrier medium. The block copolymeric nanoparticles thus formed have at least one crosslinked polymeric phase.

Claims

1. A method for the preparation of plural block copolymeric nanoparticles, said method comprising the steps of:

(a) forming a solution by dissolving a crosslinkable block copolymer in a carrier medium, wherein said crosslinkable block copolymer is present in said solution at a concentration of at least 2 weight percent and no more than 32 weight percent, based on the weight of said solution;

(b) combining at least one crosslinking agent with said solution;

reacting said crosslinking agent with said crosslinkable block copolymer; and

optionally, isolating said block copolymeric nanoparticles;

wherein;

(i) said crosslinkable block copolymer comprises at least one crosslinkable block and at least one non-crosslinkable block;

(ii) said crosslinkable block comprises at least one crosslinkable group, or at least one group modifiable to produce a crosslinkable group; and

(iii) said crosslinkable block copolymer is miscible with said carrier medium at said concentration.

2. The method of claim 1, wherein the amount of said crosslinking agent present in said solution is 0.05 to 10 times the stoichiometric quantity, wherein said stoichiometric quantity is that amount of said crosslinking agent having a total number of crosslinking groups equal to the total number of said crosslinkable groups present in all of the crosslinkable blocks of said crosslinkable block copolymer present in said solution.

3. The method of claim 1, wherein said crosslinkable block copolymer is present in said carrier medium at a concentration of 2 to 30 weight percent, based on the weight of said solution.

4. The method of claim 1, wherein the average particle size of said block copolymeric nanoparticles is 0.005 micron to 0.200 micron.

5. The method of claim 1, wherein the degree of polymerization of said crosslinkable block is 2 to 1,000.

6. The method of claim 1, wherein the degree of polymerization of said non-crosslinkable block is 2 to 2,000.

7. A method of claim 1, wherein said crosslinkable block copolymer comprises two or three blocks.

8. The method of claim 1, wherein the ratio of said crosslinkable block to said non-crosslinkable block is 1:

10 to 5;

1, wherein said ratio is calculated by dividing the degree of polymerization of said crosslinkable block by the degree of polymerization of said non-crosslinkable block.

9. The method of claim 1, comprising the further steps of:

adding an ingredient; and

incorporating said ingredient into said block polymeric nanoparticle;

wherein said ingredient is an ingredient selected from the group consisting of;

pharmaceutically active agent, cosmetic, fragrance, flavor, carrier solvent, diluent, pesticide, herbicide, fertilizer, antimicrobial, colorant, odor absorbing agent, fat absorbing agent, toxin absorbing agent, UV-absorber, liquid crystal, electrically active agent, optically active agent, and combinations thereof.

10. The method of claim 1, comprising the further steps of:

adding one or more reactants suitable for incorporation into said block polymeric nanoparticles;

incorporating said reactants into said block polymeric nanoparticles; and

reacting said reactants within said block polymeric nanoparticles.

11. The method of claim 1, wherein said block copolymeric nanoparticle comprises:

(i) a core comprising a crosslinked core derived from said crosslinkable block; and

(ii) a shell comprising said non-crosslinkable block.

12. The method of claim 11, wherein said non-crosslinkable block is miscible with said carrier medium.