Method for producing brominated and halohydrated polymers

Patent metadata

Field	Value
Publication number	US-10781271-B2
Application number	US-201916569785-A
Country	US
Kind code	B2
Filing date	Sep 13, 2019
Priority date	Jan 30, 2015
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

Conjugated diene polymers such as a styrene-butadiene copolymer are sequentially brominated by reaction with a quaternary ammonium tribromide or quaternary phosphonium tribromide and halohydrated by reaction with an N-haloimide compound. This produces a brominated and halohydrated polymer with very good thermal stability. The product is useful as a flame retardant in a variety of polymer systems.

First claim

What is claimed is:

1. A brominated and halohydrated polymer made according to a process comprising (a) reacting a starting polymer of at least one conjugated diene with a quaternary ammonium tribromide, quaternary phosphonium tribromide compound or both a quaternary ammonium tribromide and a quaternary phosphonium tribromide to brominate 50% to 98% of the conjugated diene repeating units in the starting polymer to form a partially brominated polymer and then (b) reacting the partially brominated polymer with an N-haloimide compound in the presence of water and a water-miscible solvent system for the partially brominated polymer to halohydrate at least a portion of the remaining conjugated diene repeating units and produce a brominated and halohydrated polymer.

2. A brominated and halohydrated polymer of at least one conjugated diene, wherein 2 to 50% of the conjugated diene units of the polymer are halohydrated, 50 to 98% of the conjugated diene units are brominated and 0 to 10% of the conjugated diene units are unreacted, which brominated and halohydrated polymer has a 5% weight loss temperature of at least 250° C.

3. The brominated and halohydrated polymer of claim 1 wherein 5 to 35% of the conjugated diene units are halohydrated, 65 to 95% of the conjugated diene units are brominated, and 0 to 5% of the conjugated diene units are unreacted.

4. The brominated and halohydrated polymer of claim 1 wherein 2 to 25% of the conjugated diene units are halohydrated, 75 to 98% of the conjugated diene units are brominated, and 0 to 5% of the conjugated diene units are unreacted.

5. The brominated and halohydrated polymer of claim 4 wherein 5 to 20% are of the conjugated diene unites are halohydrated, 80 to 95% of the conjugated diene units are brominated, and 0 to 5% of the conjugated diene units are unreacted.

6. The brominated and halohydrated polymer ofclaim 2 which is a thermoplastic material that contains no more than 3 weight-percent and more preferably no more than 1 weight percent of gel material.

7. The brominated and halohydrated polymer of claim 2 which is crosslinked.

8. The brominated and halohydrated polymer of claim 2 which is in the form of particles having diameters from 500 nm to 25 μm.

9. A polyol composition comprising at least one polyol and the brominated and halohydrated polymer of claim 2 .

10. An isocyanate-based polymer containing the brominated and halohydrated polymer of claim 2 .

11. An extruded polymer foam containing a bulk polymer and the brominated and halohydrated polymer of claim 2 .

12. A polymer blend comprising a bulk polymer which is one or more polymers or copolymers of styrene, a polyacrylate or polymethacrylate polymer or a mixture of any two or more thereof, and the brominated and halohydrated polymer of claim 2 .

Assignees

• Ddp Specialty Electronic Mat Us Inc

Inventors

• Hull Jr John W
• Kram Shari
• Porter Michal Elizabeth
• Stobby William G

Classifications

• C08F8/20

  Halogenation · CPC title

• C08J9/00

  Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof (mechanical aspects of shaping of plastics or substances in a plastic state for the production of porous or cellular articles B29C) · CPC title

• C08C19/12 Primary

  Incorporating halogen atoms into the molecule · CPC title

• C08J2309/06

  Copolymers with styrene · CPC title

• C08F8/18

  Introducing halogen atoms or halogen-containing groups · CPC title