PHOTOCROSSLINKABLE BLOCK COPOLYMERS FOR HOT-MELT ADHESIVES
First Claim
1. A method of forming a macroinitiator polymer by a single electron transfer living radical polymerization comprising the steps of:
- a) providing a reaction mixture comprising a plurality of vinyl monomers, a halogen terminated initiator, and a ligand in a solvent;
b) purging the reaction mixture with nitrogen; and
c) adding to the reaction mixture a solid copper hydrazine-activated catalyst and polymerizing the reaction mixture in the presence of the catalyst under a positive pressure of nitrogen to produce a macroinitiator polymer having a molecular weight of from 55,000 to 75,000 grams/mole, a polydispersity index of 1.2 to 1.8, and a glass transition temperature of less than 20°
C.
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Accused Products
Abstract
Disclosed is a method for formation of block copolymers using a Single Electron Transfer Living Radical Polymerization (SET-LRP) process. The process can be used to form di and tri-block copolymers from vinyl monomers. In one embodiment the SET-LRP process comprises initially forming a macroinitiator using SET-LRP to form a first block of a di or tri-block copolymer and then using SET-LRP to form additional blocks of the copolymer. The produced block copolymers have very narrow polydispersity indexes and controlled molecular weights. The process permits incorporation of photoinitiators in any of the block formation reactions. The method also includes purification processes that result in a block copolymer having very low color making it useful in a variety of applications. In one application block copolymers prepared according to the present process can be used in hot-melt adhesives.
5 Citations
32 Claims
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1. A method of forming a macroinitiator polymer by a single electron transfer living radical polymerization comprising the steps of:
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a) providing a reaction mixture comprising a plurality of vinyl monomers, a halogen terminated initiator, and a ligand in a solvent; b) purging the reaction mixture with nitrogen; and c) adding to the reaction mixture a solid copper hydrazine-activated catalyst and polymerizing the reaction mixture in the presence of the catalyst under a positive pressure of nitrogen to produce a macroinitiator polymer having a molecular weight of from 55,000 to 75,000 grams/mole, a polydispersity index of 1.2 to 1.8, and a glass transition temperature of less than 20°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of forming a macroinitiator polymer a single electron transfer living radical polymerization comprising the steps of:
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a) providing a reaction mixture comprising at least one vinyl monomer, a halogen terminated initiator, and a ligand in a solvent; b) purging the reaction mixture with nitrogen; and c) adding to the reaction mixture a solid copper hydrazine-activated catalyst and polymerizing the reaction mixture in the presence of the catalyst under a positive pressure of nitrogen to produce a macroinitiator polymer having a molecular weight of from 4,000 to 15,000 grams/mole, a polydispersity index of 1.2 to 1.8, and a glass transition temperature of greater than 80°
C. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification